Is it possible to determine that I did a 'lein repl'

[Cecil Westerhof]

In my application I have a quit button which does:
(System/exit 0)

But when I used 'lein repl' I do not want to exit, but just close the
frame. Can this be done?

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Reflection warning on setCaretPosition

[Cecil Westerhof]

On a editor-pane I use:
(.setCaretPosition html-table 0)

​And it does what it should do. But when I run:
lein check

I get:
Reflection warning, quotes/core.clj:98:42 - call to method
setCaretPosition can't be resolved (target class is unknown).

Is that something to worry about?

By the way, I get also some on jdbc and seesaw.​

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Re: Is it possible to determine that I did a 'lein repl'

[henry w]

I had exactly that problem when using an old version of JDAF. The newer 
version makes it configurable.

to get around the problem i used AspectJ like this:

@Aspect
public class SystemExitEvader {

@Pointcut("call(* java.lang.System.exit(..)) && args(status)")
public void systemExitCall(int status){}

@Around("systemExitCall(status)")
public void doNothing(ProceedingJoinPoint thisJoinPoint, int status){
System.out.println("Call to System.exit() attempted");
// note: there is no call to proceed()
}


}

btw, if you have any java code still, take a look at DCEVM 
 which makes the whole 'develop java gui from 
repl' experience much better.

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Re: Is it possible to determine that I did a 'lein repl'

[Cecil Westerhof]

2015-02-27 10:01 GMT+01:00 henry w :

> I had exactly that problem when using an old version of JDAF. The newer
> version makes it configurable.
>
> to get around the problem i used AspectJ like this:
>
> @Aspect
> public class SystemExitEvader {
>
> @Pointcut("call(* java.lang.System.exit(..)) && args(status)")
> public void systemExitCall(int status){}
>
> @Around("systemExitCall(status)")
> public void doNothing(ProceedingJoinPoint thisJoinPoint, int status){
> System.out.println("Call to System.exit() attempted");
> // note: there is no call to proceed()
> }
>
>
> }
>

​How would I implement this in Clojure?

-- 
​​

Cecil Westerhof

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Re: Reflection warning on setCaretPosition

[Gary Verhaegen]

It means the Clojure compiler cannot emit the efficient bytecode directly,
so it emits bytecode that calls the method reflexively.

This only impacts performance, so if that code is not used much, it is not
a problem.

The underlying problem is that jvm bytecode is typed, so ideally the
bytecode should be able to say "call method M of type T on object O". Here,
the Clojure Compiler cannot infer a type for html-table, so instead the
emitted bytecode is more along the lines of "ask object O to give a list of
all of its types, then look into each of these types to find if one has a
method that matches M in terms of name and number of arguments, and then
look at that method's signature and check if the arguments can be cast to
the types of the formal parameters; if there is a type with such a method,
invoke that method".

This is not 100% technically accurate (in particular, i have no idea what
reflection does about the arguments and their types in this case), but it
should be roughly correct and you can easily see why that would be much
slower.

If you want to remove that warning, you can annotate the html-table
variable, but the place where you must do that will depend on a little more
context than what you've given here. It is usually done at the level of var
declaration or in function argument lists.

On Friday, 27 February 2015, Cecil Westerhof  wrote:

> On a editor-pane I use:
> (.setCaretPosition html-table 0)
>
> ​And it does what it should do. But when I run:
> lein check
>
> I get:
> Reflection warning, quotes/core.clj:98:42 - call to method
> setCaretPosition can't be resolved (target class is unknown).
>
> Is that something to worry about?
>
> By the way, I get also some on jdbc and seesaw.​
>
> --
> Cecil Westerhof
>
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Re: Is it possible to determine that I did a 'lein repl'

[henry w]

Well, I dont know if you could. but unless anyone else chimes in with 
another solution... there's no problem using clojure and java together in a 
lein project. 

And just to check ... this system/exit call is library code you have no 
control over right? I mean, if not of course you can stick a *when* block 
around it looking for a system property set from the repl or something 
along those lines.

On Friday, February 27, 2015 at 9:16:04 AM UTC, Cecil Westerhof wrote:
>
> 2015-02-27 10:01 GMT+01:00 henry w >:
>
>> I had exactly that problem when using an old version of JDAF. The newer 
>> version makes it configurable.
>>
>> to get around the problem i used AspectJ like this:
>>
>> @Aspect
>> public class SystemExitEvader {
>>
>> @Pointcut("call(* java.lang.System.exit(..)) && args(status)")
>> public void systemExitCall(int status){}
>>
>> @Around("systemExitCall(status)")
>> public void doNothing(ProceedingJoinPoint thisJoinPoint, int status){
>> System.out.println("Call to System.exit() attempted");
>> // note: there is no call to proceed()
>> }
>>
>>
>> }
>>
>
> ​How would I implement this in Clojure?
>
> -- 
> ​​
>
> Cecil Westerhof
>  

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Re: should edn recognise defrecord?

[Colin Yates]

http://www.compoundtheory.com/clojure-edn-walkthrough/ is a nice read 
around this as well.

On Tuesday, 24 February 2015 21:40:14 UTC, Colin Yates wrote:
>
> I am sending instances of defrecords from clojurescript via transmit/edn 
> and getting:
>
> 2015-Feb-24 19:23:52 + dev-os-mbp.local DEBUG [taoensso.sente] - Bad 
> package: [[:client/message #health.shared.domain.PingCommand{}]] 
> (clojure.lang.ExceptionInfo: No reader function for tag 
> health.shared.domain.PingCommand {:type :reader-exception})
>
> The defrecord is defined using cljx and is definitely there on the server.
>
> Do I need to write a reader function to recognise instances of defrecord - 
> my assumption was that this should just work?
>
> Thanks!
>

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Re: Reflection warning on setCaretPosition

[Cecil Westerhof]

2015-02-27 11:34 GMT+01:00 Gary Verhaegen :

> It means the Clojure compiler cannot emit the efficient bytecode directly,
> so it emits bytecode that calls the method reflexively.
>
> This only impacts performance, so if that code is not used much, it is not
> a problem.
>

​It is not used much, so it should not be a real problem.
​



> The underlying problem is that jvm bytecode is typed, so ideally the
> bytecode should be able to say "call method M of type T on object O". Here,
> the Clojure Compiler cannot infer a type for html-table, so instead the
> emitted bytecode is more along the lines of "ask object O to give a list of
> all of its types, then look into each of these types to find if one has a
> method that matches M in terms of name and number of arguments, and then
> look at that method's signature and check if the arguments can be cast to
> the types of the formal parameters; if there is a type with such a method,
> invoke that method".
>
> This is not 100% technically accurate (in particular, i have no idea what
> reflection does about the arguments and their types in this case), but it
> should be roughly correct and you can easily see why that would be much
> slower.
>
> If you want to remove that warning, you can annotate the html-table
> variable, but the place where you must do that will depend on a little more
> context than what you've given here. It is usually done at the level of var
> declaration or in function argument lists.
>

​This is the code:
   (let [html-table (editor-pane
 :content-type "text/html"
 :text (str html-start
html-records
html-end))
]
(.setCaretPosition html-table 0)

So html-table is a JEditorPane. Should Clojure not be able to determine
that?


Just to satisfy my curiosity: how can I get rid of the warning?
​


On Friday, 27 February 2015, Cecil Westerhof  wrote:

> On a editor-pane I use:
>> (.setCaretPosition html-table 0)
>>
>> ​And it does what it should do. But when I run:
>> lein check
>>
>> I get:
>> Reflection warning, quotes/core.clj:98:42 - call to method
>> setCaretPosition can't be resolved (target class is unknown).
>>
>> Is that something to worry about?
>>
>> By the way, I get also some on jdbc and seesaw.​
>>
>
​Strange enough I only get the warnings on my own code now.
​

-- 
Cecil Westerhof

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Re: Is it possible to determine that I did a 'lein repl'

[Cecil Westerhof]

2015-02-27 11:42 GMT+01:00 henry w :

> Well, I dont know if you could. but unless anyone else chimes in with
> another solution... there's no problem using clojure and java together in a
> lein project.
>
> And just to check ... this system/exit call is library code you have no
> control over right? I mean, if not of course you can stick a *when* block
> around it looking for a system property set from the repl or something
> along those lines.
>


​The system/exit call is in my own code. When closing the main frame, the
application should normally terminate, but not when I called it from the
REPL, then I should just close the window. So that if I could see it was
called from the REPL then I could only close and not exit. I could set a
variable before I call -main, but I would prefer it when I did not need to.
;-)
​​

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XPATH/XSLT like access to Clojure data structures?

[Henrik Heine]

Hi folks,

do you know of a lib that let's you navigate around nested Clojure 
structures like XPATH does on XML? 
I'm aware of core.match, walk and zippers. But has anyone put those 
together in order to produce an API 
that gives you XPATH/XSLT?

- Henrik

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Re: XPATH/XSLT like access to Clojure data structures?

[Michael Griffiths]

Maybe clojure.data.zip.xml (in clojure.data.zip) is close to what you're 
looking for? http://clojure.github.io/data.zip/#clojure.data.zip.xml

On Friday, 27 February 2015 12:53:51 UTC, Henrik Heine wrote:

> Hi folks,
>
> do you know of a lib that let's you navigate around nested Clojure 
> structures like XPATH does on XML? 
> I'm aware of core.match, walk and zippers. But has anyone put those 
> together in order to produce an API 
> that gives you XPATH/XSLT?
>
> - Henrik
>
>

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Re: Is it possible to determine that I did a 'lein repl'

[Sean Corfield]

On Feb 27, 2015, at 12:09 AM, Cecil Westerhof  wrote:
> In my application I have a quit button which does:
> (System/exit 0)
> 
> But when I used 'lein repl' I do not want to exit, but just close the frame. 
> Can this be done?

Here’s how we do it. Add the following to project.clj:

  :profiles {:repl {:jvm-opts ~(conj (jvm-opts) "-Dlein.profile.repl=true")}}

jvm-opts is a function in project.clj that returns the default JVM options — we 
do different things on different platforms — it returns a vector of JVM 
options. So :jvm-opts ["-Dlein.profile.repl=true"] might be sufficient for you.

Then in our code we test:

(System/getProperty "lein.profile.repl")

This will be true if you’re in a REPL and nil otherwise.

Sean Corfield -- (904) 302-SEAN
An Architect's View -- http://corfield.org/

"Perfection is the enemy of the good."
-- Gustave Flaubert, French realist novelist (1821-1880)



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Remember old namespace when using in-ns

[pmf]

I have a peculiar problem (due to being used in a scripting context) 
related to in-ns.

I have a file that is executed in a namespace which is provided by the 
scripting infrastructure (per invocation, i.e. I do not know the namespace 
statically,it will be something like "prefix.unknown-123"). This namespace 
contains a var, say, x.

Now I can switch to a known namespace (I'll call it "prefix.known"):

(in-ns 'prefix.known)

but I can no longer use x, because x dose not exist, but 
prefix.unknown-123/x exists, but I don't know the name of the generated 
namespace.

Now, I could remember the namespace at the time of script invocation with 
*ns*, but where can I store this reference in a way that is accessible 
later after switching to the namespace prefix.known?

TL;DR: how can I propagate vars from the current namespace when switching 
to a new namespace using in-ns?

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Re: XPATH/XSLT like access to Clojure data structures?

[Henrik Heine]

This seems to work on XML/JDOM - right? 

I'm looking for something that works on Clojure data structures. And I 
wouldn't like to go from Clojure data structures->XML/JDOM only to do the 
transformation on XML/JDOM and then back to Clojure data structures.

Any idea?

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Re: cascalog and java 1.7

[Sam Ritchie]

Hey Sunil,

That's probably due for an update. Hadoop 1.x (and 0.21.x, etc) only ran 
on JDK6. As long as the Hadoop distro you've chosen runs on JDK6 or JDK8 
you're going to be fine.


Cheers,
Sam


Sunil S Nandihalli 
February 26, 2015 at 1:25 PM
Hi Everybody,
 I have been meaning to try cascalog for a while now looking at its 
powerful query language. But today when I was trying to play with it I 
am getting some errors and when I go back cascalog readme page it says 
cascalog runs only with java 1.6 . Is it just that the readme is 
outdated or does it really mean that cascalog cannot run on java 1.7? 
I thought I need to confirm this before investigating cascalog any 
further.

Thanks,
Sunil.
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www.paddleguru.com 
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Re: Is it possible to determine that I did a 'lein repl'

[Cecil Westerhof]

2015-02-27 14:29 GMT+01:00 Sean Corfield :

> On Feb 27, 2015, at 12:09 AM, Cecil Westerhof 
> wrote:
>
> In my application I have a quit button which does:
> (System/exit 0)
>
> But when I used 'lein repl' I do not want to exit, but just close the
> frame. Can this be done?
>
>
> Here’s how we do it. Add the following to project.clj:
>
>   :profiles {:repl {:jvm-opts ~(conj (jvm-opts)
> "-Dlein.profile.repl=true")}}
>


​That gives:
java.lang.Exception: Error loading /home/cecil/Clojure/quotes/project.clj
at leiningen.core.project$read$fn__3326.invoke(project.clj:696)
at leiningen.core.project$read.invoke(project.clj:693)
at leiningen.core.project$read.invoke(project.clj:703)
at leiningen.core.main$_main$fn__3092.invoke(main.clj:294)
at leiningen.core.main$_main.doInvoke(main.clj:290)
at clojure.lang.RestFn.invoke(RestFn.java:408)
at clojure.lang.Var.invoke(Var.java:415)
at clojure.lang.AFn.applyToHelper(AFn.java:161)
at clojure.lang.Var.applyTo(Var.java:532)
at clojure.core$apply.invoke(core.clj:617)
at clojure.main$main_opt.invoke(main.clj:335)
at clojure.main$main.doInvoke(main.clj:440)
at clojure.lang.RestFn.invoke(RestFn.java:436)
at clojure.lang.Var.invoke(Var.java:423)
at clojure.lang.AFn.applyToHelper(AFn.java:167)
at clojure.lang.Var.applyTo(Var.java:532)
at clojure.main.main(main.java:37)
Caused by: java.lang.RuntimeException: Unable to resolve symbol: jvm-opts
in this context, compiling:(/home/cecil/Clojure/quotes/project.clj:9:38)

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Clojure/West 2015 Speakers

[Alex Miller]

Clojure/West will take place Apr 20-22 in Portland, OR.
Register here: http://clojurewest2015.eventbrite.com

We have now posted the majority of the Clojure/West speakers:
http://clojurewest.org/speakers

In particular, I want to highlight our keynote speaker, Melanie Mitchell,
who worked for a while with Douglas Hofstadter and has written a number of
excellent books. She will talking about her recent research integrating
deep networks and analogy-making.

Other talks:
- Boot Can Build It - Alan Dipert, Micha Niskin
- Clojure at Scale - Anthony Marcar
- Clojure, Sound, and Wearable Technology - Boris Kourtoukov
- Building CircleCI's Frontend With Om - Brandon Bloom
- Developing ClojureScript with Figwheel - Bruce Hauman
- Strange Coop: How Clojure saved my chickens from the evil racoons -
Christopher Small
- Debugging Clojure code with Cursive - Colin Fleming
- Generating Art in Many Worlds - Dan Lidral-Porter
- Exploring Programming Clojure in Other Human Languages - Elango Cheran
- Adapting Clojure to an introductory CS classroom.  - Elena Machkasova
- HoneySQL: SQL Queries as Clojure Data Structures - Fumiko Hanreich
- Purely Random - Gary Fredericks
- Composing interactive applications with Zelkova - James MacAulay
- Design and Prototype a Language in Clojure - Jeanine Adkisson
- Life of a Clojure Expression: a quick tour of Clojure internals - John
Hume
- Clojure Parallelism: Beyond Futures - Leon Barrett
- The ReactJS Landscape - Luke VanderHart
- Well I wouldn't want to make a *dys*functional game - Morgan Mullaney
- Domain Specific Type Systems - Nathan Sorenson
- One Binder to Rule Them All: Introduction to Trapperkeeper - Nathaniel
Smith, Ruth Linehan
- Responsive Grids with Garden & Clojurescript - Priyatam Mudivarti
- Programming Clojure, Smalltalk-style - Robert Krahn
- Staying SAFE: a Foundation for Clojure Applications - Ron Toland
- Simulant in anger; an experience report - Ryan Neufeld
- Pattern Matching in Clojure: Best Practices - Sean Johnson
- Data Science on Clojure - Soren Macbeth
- Games and 3D Graphics in Arcadia - Timothy Gardner, Ramsey Nasser
- Creating Beautiful Spreadsheets with Data and Templates - Tom Faulhaber
- Composable Healthcare - Tyler Tallman
- The Joys and Pains to Write a Clojure Curriculum for Beginners - Yoko
Harada
- Everything Will Flow - Zach Tellman
- No-strings mobile app development for Clojure - Zachary Kim

Hope to see you there!

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Re: Is it possible to determine that I did a 'lein repl'

[Cecil Westerhof]

2015-02-27 15:56 GMT+01:00 Cecil Westerhof :

> 2015-02-27 14:29 GMT+01:00 Sean Corfield :
>
>> On Feb 27, 2015, at 12:09 AM, Cecil Westerhof 
>> wrote:
>>
>> In my application I have a quit button which does:
>> (System/exit 0)
>>
>> But when I used 'lein repl' I do not want to exit, but just close the
>> frame. Can this be done?
>>
>>
>> Here’s how we do it. Add the following to project.clj:
>>
>>   :profiles {:repl {:jvm-opts ~(conj (jvm-opts)
>> "-Dlein.profile.repl=true")}}
>>
>
>
> ​That gives:
> java.lang.Exception: Error loading /home/cecil/Clojure/quotes/project.clj
> at leiningen.core.project$read$fn__3326.invoke(project.clj:696)
> at leiningen.core.project$read.invoke(project.clj:693)
> at leiningen.core.project$read.invoke(project.clj:703)
> at leiningen.core.main$_main$fn__3092.invoke(main.clj:294)
> at leiningen.core.main$_main.doInvoke(main.clj:290)
> at clojure.lang.RestFn.invoke(RestFn.java:408)
> at clojure.lang.Var.invoke(Var.java:415)
> at clojure.lang.AFn.applyToHelper(AFn.java:161)
> at clojure.lang.Var.applyTo(Var.java:532)
> at clojure.core$apply.invoke(core.clj:617)
> at clojure.main$main_opt.invoke(main.clj:335)
> at clojure.main$main.doInvoke(main.clj:440)
> at clojure.lang.RestFn.invoke(RestFn.java:436)
> at clojure.lang.Var.invoke(Var.java:423)
> at clojure.lang.AFn.applyToHelper(AFn.java:167)
> at clojure.lang.Var.applyTo(Var.java:532)
> at clojure.main.main(main.java:37)
> Caused by: java.lang.RuntimeException: Unable to resolve symbol: jvm-opts
> in this context, compiling:(/home/cecil/Clojure/quotes/project.clj:9:38)
>

​Bit this works:
:profiles {:repl {:jvm-opts ["-Dlein.profile.repl=true"]}}

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Re: XPATH/XSLT like access to Clojure data structures?

[Michael Griffiths]

Sorry, please ignore me. I misread your post entirely :-). I think 
clojure.zip and clojure.data.zip (not the XML parts) will get you partway 
to where you want, but I do not know of any XPATH-like API over the top of 
them.

On Friday, 27 February 2015 14:08:19 UTC, Henrik Heine wrote:

> This seems to work on XML/JDOM - right? 
>
> I'm looking for something that works on Clojure data structures. And I 
> wouldn't like to go from Clojure data structures->XML/JDOM only to do the 
> transformation on XML/JDOM and then back to Clojure data structures.
>
> Any idea?
>
>

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Re: Multi-project Set-up

[Timur Sungur]

Thanks for the suggestion but I had already tried it and no success.

On Fri, Feb 27, 2015 at 7:58 AM, Eldar Gabdullin  wrote:
> Go to your checked out project and run "lein install" there.
>
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Re: Multi-project Set-up

[Timur Sungur]

Okay, just found my mistake: the dependency was not listed in the
project which checks out the other project.



On Fri, Feb 27, 2015 at 5:12 PM, Timur Sungur  wrote:
> Thanks for the suggestion but I had already tried it and no success.
>
> On Fri, Feb 27, 2015 at 7:58 AM, Eldar Gabdullin  wrote:
>> Go to your checked out project and run "lein install" there.
>>
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Re: Reflection warning on setCaretPosition

[Dave Ray]

(let [^JEditorPane html-table (editor-pane ...)] ...)  should fix it. Or
just set the caret position in the create function:

(editor-pane :caret-position 0)

or use config:

(config! editor-pane :caret-position 0)

Dave


On Fri, Feb 27, 2015 at 4:07 AM, Cecil Westerhof 
wrote:

> 2015-02-27 11:34 GMT+01:00 Gary Verhaegen :
>
>> It means the Clojure compiler cannot emit the efficient bytecode
>> directly, so it emits bytecode that calls the method reflexively.
>>
>> This only impacts performance, so if that code is not used much, it is
>> not a problem.
>>
>
> ​It is not used much, so it should not be a real problem.
> ​
>
>
>
>> The underlying problem is that jvm bytecode is typed, so ideally the
>> bytecode should be able to say "call method M of type T on object O". Here,
>> the Clojure Compiler cannot infer a type for html-table, so instead the
>> emitted bytecode is more along the lines of "ask object O to give a list of
>> all of its types, then look into each of these types to find if one has a
>> method that matches M in terms of name and number of arguments, and then
>> look at that method's signature and check if the arguments can be cast to
>> the types of the formal parameters; if there is a type with such a method,
>> invoke that method".
>>
>> This is not 100% technically accurate (in particular, i have no idea what
>> reflection does about the arguments and their types in this case), but it
>> should be roughly correct and you can easily see why that would be much
>> slower.
>>
>> If you want to remove that warning, you can annotate the html-table
>> variable, but the place where you must do that will depend on a little more
>> context than what you've given here. It is usually done at the level of var
>> declaration or in function argument lists.
>>
>
> ​This is the code:
>(let [html-table (editor-pane
>  :content-type "text/html"
>  :text (str html-start
> html-records
> html-end))
> ]
> (.setCaretPosition html-table 0)
>
> So html-table is a JEditorPane. Should Clojure not be able to determine
> that?
>
>
> Just to satisfy my curiosity: how can I get rid of the warning?
> ​
>
>
> On Friday, 27 February 2015, Cecil Westerhof 
> wrote:
>
>> On a editor-pane I use:
>>> (.setCaretPosition html-table 0)
>>>
>>> ​And it does what it should do. But when I run:
>>> lein check
>>>
>>> I get:
>>> Reflection warning, quotes/core.clj:98:42 - call to method
>>> setCaretPosition can't be resolved (target class is unknown).
>>>
>>> Is that something to worry about?
>>>
>>> By the way, I get also some on jdbc and seesaw.​
>>>
>>
> ​Strange enough I only get the warnings on my own code now.
> ​
>
> --
> Cecil Westerhof
>
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Re: Reflection warning on setCaretPosition

[Cecil Westerhof]

2015-02-27 17:30 GMT+01:00 Dave Ray :

> (let [^JEditorPane html-table (editor-pane ...)] ...)  should fix it. Or
> just set the caret position in the create function:
>
> (editor-pane :caret-position 0)
>

​This one I find the the best option. You only need to do it after the
:text option.
​


> or use config:
>
> (config! editor-pane :caret-position 0)
>



> On Fri, Feb 27, 2015 at 4:07 AM, Cecil Westerhof 
> wrote:
>
>>
>> 2015-02-27 11:34 GMT+01:00 Gary Verhaegen :
>>
>>> It means the Clojure compiler cannot emit the efficient bytecode
>>> directly, so it emits bytecode that calls the method reflexively.
>>>
>>> This only impacts performance, so if that code is not used much, it is
>>> not a problem.
>>>
>>
>> ​It is not used much, so it should not be a real problem.
>> ​
>>
>>
>>
>>> The underlying problem is that jvm bytecode is typed, so ideally the
>>> bytecode should be able to say "call method M of type T on object O". Here,
>>> the Clojure Compiler cannot infer a type for html-table, so instead the
>>> emitted bytecode is more along the lines of "ask object O to give a list of
>>> all of its types, then look into each of these types to find if one has a
>>> method that matches M in terms of name and number of arguments, and then
>>> look at that method's signature and check if the arguments can be cast to
>>> the types of the formal parameters; if there is a type with such a method,
>>> invoke that method".
>>>
>>> This is not 100% technically accurate (in particular, i have no idea
>>> what reflection does about the arguments and their types in this case), but
>>> it should be roughly correct and you can easily see why that would be much
>>> slower.
>>>
>>> If you want to remove that warning, you can annotate the html-table
>>> variable, but the place where you must do that will depend on a little more
>>> context than what you've given here. It is usually done at the level of var
>>> declaration or in function argument lists.
>>>
>>
>> ​This is the code:
>>(let [html-table (editor-pane
>>  :content-type "text/html"
>>  :text (str html-start
>> html-records
>> html-end))
>> ]
>> (.setCaretPosition html-table 0)
>>
>> So html-table is a JEditorPane. Should Clojure not be able to determine
>> that?
>>
>>
>> Just to satisfy my curiosity: how can I get rid of the warning?
>> ​
>>
>>
>> On Friday, 27 February 2015, Cecil Westerhof 
>> wrote:
>>
>>> On a editor-pane I use:
 (.setCaretPosition html-table 0)

 ​And it does what it should do. But when I run:
 lein check

 I get:
 Reflection warning, quotes/core.clj:98:42 - call to method
 setCaretPosition can't be resolved (target class is unknown).

 Is that something to worry about?

 By the way, I get also some on jdbc and seesaw.​

>>>
>> ​Strange enough I only get the warnings on my own code now.
>>
>
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Re: Reflection warning on setCaretPosition

[Cecil Westerhof]

2015-02-27 17:30 GMT+01:00 Dave Ray :

> (let [^JEditorPane html-table (editor-pane ...)] ...)  should fix it. Or
> just set the caret position in the create function:
>

​I have removed all my warnings by using: ^JEditorPane, ^JFrame​

​, …
But I always like to check deeper. On one of the places I have now:
^JLabel (text …

lein check gives no warning, neither does lein compile. And lein run just
runs the application. Is that not strange? I say that a JTextField is a
JLabel, but the application does not choke on it.​

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Re: XPATH/XSLT like access to Clojure data structures?

[Christopher Small]

Interesting idea... Haven't seen anything myself. I think that would be 
useful though! Someone should build it if it doesn't exist yet.

On Friday, February 27, 2015 at 4:53:51 AM UTC-8, Henrik Heine wrote:
>
> Hi folks,
>
> do you know of a lib that let's you navigate around nested Clojure 
> structures like XPATH does on XML? 
> I'm aware of core.match, walk and zippers. But has anyone put those 
> together in order to produce an API 
> that gives you XPATH/XSLT?
>
> - Henrik
>
>

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Re: XPATH/XSLT like access to Clojure data structures?

[Jeremy Heiler]

On Fri, Feb 27, 2015 at 7:53 AM, Henrik Heine 
wrote:
>
> do you know of a lib that let's you navigate around nested Clojure
> structures like XPATH does on XML?
> I'm aware of core.match, walk and zippers. But has anyone put those
> together in order to produce an API
> that gives you XPATH/XSLT?
>

I have written a library that wraps the built in JDK XPath functionality.
It's not complete, because it doesn't deal with namespaces or custom
functions. Regardless, it worked for what I needed it for. If you need a
certain feature, I'd be happy to work it in or accept patches.

https://github.com/jeremyheiler/xenopath

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Re: Reflection warning on setCaretPosition

[Andy Fingerhut]

If (text ...) is an invocation of a macro, not a function, then that type
tag is most likely silently ignored by the Clojure compiler, not hurting
anything, but not helping anything, either.

Eastwood [1] can warn you about such useless type tags in your Clojure
code, via the :unused-meta-on-macro [2] linter.  Some other incorrect type
tags are checked for via the :wrong-tag linter [3].  Not all kinds of
Eastwood checks are enabled by default, but those two are.

Andy

[1] https://github.com/jonase/eastwood
[2] https://github.com/jonase/eastwood#unused-meta-on-macro
[3] https://github.com/jonase/eastwood#wrong-tag


On Fri, Feb 27, 2015 at 9:51 AM, Cecil Westerhof 
wrote:

> 2015-02-27 17:30 GMT+01:00 Dave Ray :
>
>> (let [^JEditorPane html-table (editor-pane ...)] ...)  should fix it. Or
>> just set the caret position in the create function:
>>
>
> ​I have removed all my warnings by using: ^JEditorPane, ^JFrame​
>
> ​, …
> But I always like to check deeper. On one of the places I have now:
> ^JLabel (text …
>
> lein check gives no warning, neither does lein compile. And lein run just
> runs the application. Is that not strange? I say that a JTextField is a
> JLabel, but the application does not choke on it.​
>
> --
> Cecil Westerhof
>
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printf does not always generate output

[Cecil Westerhof]

My core.clj ends with:
(println (format "Started: %s (println)" (java.util.Date.)))
(printf "Started: %s (printf)\n" (java.util.Date.))

I do not see the output from the printf when I run 'lein repl'.
The funny thing is that when I switch the two statements, both are shown.
Also when I do 'lein run' both are shown.

What could be happening here?

For the moment I changed all my printf to println with format, but it is a
little annoying.


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Re: printf does not always generate output

[Steve Miner]

Try adding (flush) at the end.

> On Feb 27, 2015, at 2:12 PM, Cecil Westerhof  wrote:
> 
> My core.clj ends with:
> (println (format "Started: %s (println)" (java.util.Date.)))
> (printf "Started: %s (printf)\n" (java.util.Date.))
> 
> I do not see the output from the printf when I run 'lein repl'.
> The funny thing is that when I switch the two statements, both are shown.
> Also when I do 'lein run' both are shown.
> 
> What could be happening here?
> 
> For the moment I changed all my printf to println with format, but it is a 
> little annoying.

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Re: printf does not always generate output

[Andy Fingerhut]

Not every function and macro is documented completely or accurately on
ClojureDocs.org, but I would recommend checking it out when you run across
something that looks amiss, and see if the examples mention what you are
seeing.  In this case, it does:

http://clojuredocs.org/clojure.core/printf

Andy


On Fri, Feb 27, 2015 at 11:12 AM, Cecil Westerhof 
wrote:

> My core.clj ends with:
> (println (format "Started: %s (println)" (java.util.Date.)))
> (printf "Started: %s (printf)\n" (java.util.Date.))
>
> I do not see the output from the printf when I run 'lein repl'.
> The funny thing is that when I switch the two statements, both are shown.
> Also when I do 'lein run' both are shown.
>
> What could be happening here?
>
> For the moment I changed all my printf to println with format, but it is a
> little annoying.
>
>
> --
> Cecil Westerhof
>
> --
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Re: Is it possible to determine that I did a 'lein repl'

[Sean Corfield]

On Feb 27, 2015, at 6:56 AM, Cecil Westerhof  wrote:
> Caused by: java.lang.RuntimeException: Unable to resolve symbol: jvm-opts in 
> this context, compiling:(/home/cecil/Clojure/quotes/project.clj:9:38)

Right, as I said:

"jvm-opts is a function in project.clj that returns the default JVM options — 
we do different things on different platforms — it returns a vector of JVM 
options. So :jvm-opts ["-Dlein.profile.repl=true"] might be sufficient for you."

Sean Corfield -- (904) 302-SEAN
An Architect's View -- http://corfield.org/

"Perfection is the enemy of the good."
-- Gustave Flaubert, French realist novelist (1821-1880)



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ANN Langohr 3.1.0 is released

[Michael Klishin]

Langohr [1] is a small, feature complete Clojure client for RabbitMQ.

Release notes:
http://blog.clojurewerkz.org/blog/2015/02/27/langohr-3-dot-1-0-is-released/

1. http://clojurerabbitmq.info
-- 
@michaelklishin, github.com/michaelklishin

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Re: Is it possible to determine that I did a 'lein repl'

[Cecil Westerhof]

2015-02-27 21:10 GMT+01:00 Sean Corfield :

> On Feb 27, 2015, at 6:56 AM, Cecil Westerhof 
> wrote:
>
> Caused by: java.lang.RuntimeException: Unable to resolve symbol: jvm-opts
> in this context, compiling:(/home/cecil/Clojure/quotes/project.clj:9:38)
>
>
> Right, as I said:
>

​You are right: I did not read good enough. :-(​




> "jvm-opts is a function in project.clj that returns the default JVM
> options — we do different things on different platforms — it returns a
> vector of JVM options. So :jvm-opts ["-Dlein.profile.repl=true"] might be
> sufficient for you."
> ​​
>

-- 
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Re: printf does not always generate output

[Cecil Westerhof]

2015-02-27 20:36 GMT+01:00 Andy Fingerhut :

> Not every function and macro is documented completely or accurately on
> ClojureDocs.org, but I would recommend checking it out when you run across
> something that looks amiss, and see if the examples mention what you are
> seeing.  In this case, it does:
>
> http://clojuredocs.org/clojure.core/printf
>

​That is certainly a place I should look more often. :-) A wealth of
information.


On Fri, Feb 27, 2015 at 11:12 AM, Cecil Westerhof 
> wrote:
>
>> My core.clj ends with:
>> (println (format "Started: %s (println)" (java.util.Date.)))
>> (printf "Started: %s (printf)\n" (java.util.Date.))
>>
>> I do not see the output from the printf when I run 'lein repl'.
>> The funny thing is that when I switch the two statements, both are shown.
>> Also when I do 'lein run' both are shown.
>>
>> What could be happening here?
>>
>> For the moment I changed all my printf to println with format, but it is
>> a little annoying.
>>
>

-- 
Cecil Westerhof

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Re: printf does not always generate output

[Sam Raker]

I 
have 
https://jafingerhut.github.io/cheatsheet/grimoire/cheatsheet-tiptip-cdocs-summary.html
 
bookmarked and also like basically always open in a tab forever, fwiw. 

On Friday, February 27, 2015 at 4:37:38 PM UTC-5, Cecil Westerhof wrote:
>
> 2015-02-27 20:36 GMT+01:00 Andy Fingerhut  >:
>
>> Not every function and macro is documented completely or accurately on 
>> ClojureDocs.org, but I would recommend checking it out when you run across 
>> something that looks amiss, and see if the examples mention what you are 
>> seeing.  In this case, it does:
>>
>> http://clojuredocs.org/clojure.core/printf
>>
>  
> ​That is certainly a place I should look more often. :-) A wealth of 
> information.
>
>
> On Fri, Feb 27, 2015 at 11:12 AM, Cecil Westerhof > > wrote:
>>
>>> My core.clj ends with:
>>> (println (format "Started: %s (println)" (java.util.Date.)))
>>> (printf "Started: %s (printf)\n" (java.util.Date.))
>>>
>>> I do not see the output from the printf when I run 'lein repl'.
>>> The funny thing is that when I switch the two statements, both are shown.
>>> Also when I do 'lein run' both are shown.
>>>
>>> What could be happening here?
>>>
>>> For the moment I changed all my printf to println with format, but it is 
>>> a little annoying.
>>>
>>
>
> -- 
> Cecil Westerhof
>  

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Re: printf does not always generate output

[Cecil Westerhof]

2015-02-27 22:47 GMT+01:00 Sam Raker :

> I have
> https://jafingerhut.github.io/cheatsheet/grimoire/cheatsheet-tiptip-cdocs-summary.html
> bookmarked and also like basically always open in a tab forever, fwiw.
>

​Also good information.
​

-- 
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Re: Reflection warning on setCaretPosition

[Fluid Dynamics]

On Friday, February 27, 2015 at 12:51:45 PM UTC-5, Cecil Westerhof wrote:
>
> 2015-02-27 17:30 GMT+01:00 Dave Ray >:
>
>> (let [^JEditorPane html-table (editor-pane ...)] ...)  should fix it. Or 
>> just set the caret position in the create function:
>>
>
> ​I have removed all my warnings by using: ^JEditorPane, ^JFrame​
>  
> ​, …
> But I always like to check deeper. On one of the places I have now:
> ^JLabel (text …
>
> lein check gives no warning, neither does lein compile. And lein run just 
> runs the application. Is that not strange? I say that a JTextField is a 
> JLabel, but the application does not choke on it.​
>

If you are only calling methods on the object that exist in those classes' 
common superclass JComponent, then nothing is likely to go wrong. If you 
call a JLabel specific method on an object that's actually a JTextField 
that Clojure merely *thinks* is a JLabel, you'll get a ClassCastException 
at runtime. 

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Re: cascalog and java 1.7

[Sunil S Nandihalli]

Thank you Sam for the response. I am up and running with cascalog on
java-1.7 cascalog 2.1.1
Regards,
Sunil.

On Fri, Feb 27, 2015 at 8:08 PM, Sam Ritchie  wrote:

> Hey Sunil,
>
> That's probably due for an update. Hadoop 1.x (and 0.21.x, etc) only ran
> on JDK6. As long as the Hadoop distro you've chosen runs on JDK6 or JDK8
> you're going to be fine.
>
> Cheers,
> Sam
>
>   Sunil S Nandihalli 
>  February 26, 2015 at 1:25 PM
> Hi Everybody,
>  I have been meaning to try cascalog for a while now looking at its
> powerful query language. But today when I was trying to play with it I am
> getting some errors and when I go back cascalog readme page it says
> cascalog runs only with java 1.6 . Is it just that the readme is outdated
> or does it really mean that cascalog cannot run on java 1.7? I thought I
> need to confirm this before investigating cascalog any further.
> Thanks,
> Sunil.
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Re: How do I depend on clojure 1.7.0-master-SNAPSHOT?

[Michael Griffiths]

Sean, thanks - but does it still work for you if you remove ~/.m2/ (or just 
remove 1.7.0-master-SNAPSHOT from here)? I've tried with the trailing slash 
and am still having no luck (both locally and on Travis CI).

Andy, having this as a dependency was working previously but I will clone 
and build master directly in the meantime - thank you.

Michael

On Thursday, 26 February 2015 23:11:05 UTC, Sean Corfield wrote:
>
> On Feb 26, 2015, at 11:21 AM, Michael Griffiths  > wrote: 
> > I have the following in my project.clj: 
> > 
> >   :dependencies [[org.clojure/clojure "1.7.0-master-SNAPSHOT"]] 
> >   :repositories [["snapshots" "
> https://oss.sonatype.org/content/repositories/snapshots";]] 
>
> The only difference between my project.clj (which works) and yours is the 
> trailing / on the repository address: 
>
> :dependencies [[org.clojure/clojure "1.7.0-master-SNAPSHOT"]] 
> :repositories [["snapshots" "
> https://oss.sonatype.org/content/repositories/snapshots/";]] 
>
> Sean Corfield -- (904) 302-SEAN 
> An Architect's View -- http://corfield.org/ 
>
> "Perfection is the enemy of the good." 
> -- Gustave Flaubert, French realist novelist (1821-1880) 
>
>
>
>

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Re: How do I depend on clojure 1.7.0-master-SNAPSHOT?

[Sean Corfield]

On Feb 27, 2015, at 3:30 PM, Michael Griffiths  wrote:
> Sean, thanks - but does it still work for you if you remove ~/.m2/ (or just 
> remove 1.7.0-master-SNAPSHOT from here)? I've tried with the trailing slash 
> and am still having no luck (both locally and on Travis CI).

Yes — just to test I blew away my ~/.m2/repository/org tree and re-ran my build 
and Leiningen pulled down the latest snapshot (along with hundreds of other 
org.* dependencies):

 [exec] Retrieving 
org/clojure/clojure/1.7.0-master-SNAPSHOT/clojure-1.7.0-master-20150220.180325-29.pom
 from sonatype
 [exec] Retrieving 
org/clojure/clojure/1.7.0-master-SNAPSHOT/clojure-1.7.0-master-20150220.180325-29.jar
 from sonatype

Sean Corfield -- (904) 302-SEAN
An Architect's View -- http://corfield.org/

"Perfection is the enemy of the good."
-- Gustave Flaubert, French realist novelist (1821-1880)



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[JOB] Clojure Selenium Load Testing Consultant

[Alexander Hudek]

Here at DiligenceEngine we’re building out a load testing system for our 
Om-based ClojureScript and Clojure web application. We need to scale out 
test scenarios to 500+ concurrent users are looking for someone experienced 
in writing selenium tests in Clojure to give us a hand. 

Required skills


   - Clojure

Very much desired skills


   - Selenium WebDriver (clj-webdriver or java selenium APIs)
   - Coding to AWS EC2 APIs (amazonica or similar Clojure wrapper, or java 
   APIs)
   - Linux (CentOS in particular) in AWS (cloud-init, similar processes)
   - Knowledge of Clojure/Selenium based cloud technologies we might use to 
   speed our goals

Nice to have skills


   - Selenium related tools such as Selenium Grid
   - Traditional load testing tools (and knowledge of their limitations) 
   such as LoadRunner


This job would last 1-2 months and can start immediately.  Remote is 
welcome, though we prefer someone in a north american time zone to make 
communication easier. If you are interested please get in touch at 
j...@diligenceengine.com

--

For those interested, our application is a single-page app using 
ClojureScript and Om on the client and Clojure on the server. It is a 
highly dynamic app, every single change to the database results in 
automatic updates being sent out to all clients watching the relevant 
resources. We use a combination of REST routes for change requests and 
browserchannel for async push of data updates to make this happen. 


Unfortunately, these technologies have also made it quite challenging to 
load test. In particular, we’ve found that it is difficult to get most 
traditional load testing tools to work well with browserchannel. For this 
reason we’ve settle on Selenium to simulate load. We’re using AWS to host 
and build our testing environment.

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