like, 2012) to generate the bytecode on
the fly.
On Sun, Jun 9, 2019 at 9:25 PM eglue wrote:
> Regarding calling Clojure **from** Java...
>
> I saw a Stuart Halloway tweet responding to someone who'd found this a
> "soul-crushing, miserable experience."
>
> I had a
Regarding calling Clojure **from** Java...
I saw a Stuart Halloway tweet responding to someone who'd found this a
"soul-crushing, miserable experience."
I had a similar miserable experience and figured it was just me, but am now
suspecting that's not the case. (Happy t
re layer would
>>>> allow interaction with this system dynamically. I am designing a Clojure
>>>> DSL that would allow a user to load new functions and deploy them live
>>>> into
>>>> the Java framework. My current design is to push a Clojure
> the Java framework. My current design is to push a Clojure function string
>>> into the Java layer and use the guidance from this post to execute:
>>> http://stackoverflow.com/questions/2181774/calling-clojure-from-java/23555959#23555959
>>>
>>> Here is a gis
nto the Java
>> framework. My current design is to push a Clojure function string into the
>> Java layer and use the guidance from this post to execute:
>> http://stackoverflow.com/questions/2181774/calling-clojure-from-java/23555959#23555959
>>
>
to load new functions and deploy them live into the Java
> framework. My current design is to push a Clojure function string into the
> Java layer and use the guidance from this post to execute:
> http://stackoverflow.com/questions/2181774/calling-clojure-from-java/23555959#23555959
>
> H
the Java
framework. My current design is to push a Clojure function string into the
Java layer and use the guidance from this post to
execute:
http://stackoverflow.com/questions/2181774/calling-clojure-from-java/23555959#23555959
Here is a gist example based on that thread:
https
clojure code from java is through RT. An example
> would be the accepted answer here:
> http://stackoverflow.com/questions/2181774/calling-clojure-from-java
>
>
I really don't like the RT way (very clumsy), so I want to avoid it if
possible. My .jar file will include Clojure itse
OT your code and then directly try to
use it from java. The generated java bytecode isn't guaranteed to be
stable across versions of clojure, and you're depending on
implementation details.
One way to use your clojure code from java is through RT. An example
would be the accepted answer
Ok, I hit a wall and really did not see this coming.
Based on what I have read, its really easy for Clojure and Java to
work together. So I wrote some test Clojure code with a very simple
defrecord (say named as "testrec") and AOT compile it, create a jar
file, and add it to a "HelloWorld" java pr
Ah, cool !
Thank you very much for this insider knowledge, Mr. Sierra !!!
Great.
That means more clojure in production.
Hurrah !!!
Thanks again.
Heinz.
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Yes, Clojure has a "runtime" which is initialized the first time you call
any Clojure code.
The initialization never happens more than once.
-S
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It's the time to get all the related classes loaded needed to support the
Clojure
code and yes it's a one time cost. The first reference to x gets this triggered.
Luc
> The following makes it clearer:
>
> package e;
> >
> > import p.x;
> >
> > public final class E {
> >public static void m
The following makes it clearer:
package e;
>
> import p.x;
>
> public final class E {
>public static void main(String[] args) {
>
System.out.println("before");
> for (int i = 0; i < 100; ++i) {
> System.out.println(x.f());
> }
> }
>
>
Now: After launching, the string `be
>
> Hm. I do have the feeling, that we do not understand each other.
Code is always unambigous.
I give an example, and give my question another run.
(ns p.x
(:gen-class
:methods [ ^{:static true} [f [] String] ]))
(defn -f [] "hello, world")
Fire up a REPL, make sure, p/x.clj is in your cla
Compared to Java, not noticeable if any. We run our app in production on
cluster of
small computers.
We replaced component written mostly in Java by Clojure equivalents without
any degradation in service time. We used clojure from java a number of times
using Java callable interfaces generated in
Yes, I do compile my clojure code ahead of time (AOT) to byte code.
Does that mean, that your, ahead of time compiled clojure code,
has no noticeable delay, when you first call it ?
If in the middle of the lifetime of an app, this delay happens,
i can not consider it small, if 1 requests are
Ah, do you compile your Clojure code to Java prior to using it (AOT
compilation) ?
If not, you must add the clojure compilation time to spit out the class(es)
byte code.
Here we deliver AOTed components so there's no compilation overhead,
we do this for other reasons than this very small overhea
Thank you, for your answer.
It doesn't convince me, though.
I am well aware of the class loading mechanism of the JVM.
But if I compile against, say guava-12.0.jar (beautiful stuff by the way),
and use those classes at runtime, there is no delay in using them
whatsoever.
At least not a delay of
question.
>
> My experiments lead me to the conjecture, that
> the answer is yes.
> But a proof can only be given by someone,
> who is familiar with clojure's implementation of which I
> have no clue.
>
> Thanks for your help !:
>
> The question is concerned w
which I
have no clue.
Thanks for your help !:
The question is concerned with calling clojure from Java.
I have a bunch of clojure stuff, which I compiled to byte
code with the techniques described at http://clojure.org/compilation
I made an archive A of the result.
I have Java code, that uses t
On Thu, Jul 28, 2011 at 1:58 PM, Meikel Brandmeyer wrote:
> If the thing you want to call is a macro, you have to hope that the library
> other provided the logic as star function (as in Nicolas' case). If there is
> no function containing the actual logic, you have to re-implement the macro
>
Hi,
Am 28.07.2011 um 19:43 schrieb mmwaikar:
> Thanks again Meikel. Where can I read about things like bindRoot, intern or
> to be precise java-clojure interop?
There are only a few things you must know:
- RT.var to get a variable from a namespace
- v.invoke to invoke a function stored in a Va
It may also be useful to read up on primitives, since primitive support is
often a source of impedance mismatch when software in one language talks to
software in another. Would someone mind supplying a link to a description
of how Clojure works with Java primitives in the 1.2.1 and 1.3 release
Thanks again Meikel. Where can I read about things like bindRoot, intern or
to be precise java-clojure interop?
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Hi,
Am 26.07.2011 um 19:48 schrieb mmwaikar:
> RT.load("lobos/core", true);
> RT.load("lobos/schema", true);
You should go through require.invoke(). Not RT.load().
> and called wrapper.createTable() then I get - (# lobos.core$create_STAR_@49431028> (quote {:classname "or
Thanks Meikel, I tried the below stuff -
package com.codionics.flyway;
import clojure.lang.RT;
import clojure.lang.Var;
public class wrapper {
static final Var symbol = RT.var("clojure.core", "symbol");
static final Var require = RT.var("clojrue.core", "require");
static final Var k
On Tue, Jul 26, 2011 at 12:43 PM, mmwaikar wrote:
> Hi,
>
> I am using the Lobos library - https://github.com/budu/lobos
> In it there's a function create, which is called like this - (create db
> (table :some-name)), where db is earlier defined as - (def db
> {:classname "org.postgresql.Driv
Hi,
you should go through the normal Clojure Vars to access the functions. To
actually call the functions you use invoke. Note: table is a macro, so you
can't call it directly. You have to use the table* function and do any sugar
provided by the table macro yourself. Here is an example how this
Hi,
I am using the Lobos library - https://github.com/budu/lobos
In it there's a function create, which is called like this - (create db
(table :some-name)), where db is earlier defined as - (def db
{:classname "org.postgresql.Driver"
:subprotocol "postgresql"
:user "postgres"
Nope. I moved the main code to ns hexadoku.core (generating package
hexadoku, class core) and did the deftype in hexadoku (generating package
hexadoku, class HexSolver). The error remains
Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: Var
hexadoku.core/search is unbound.
a
On Mon, Mar 28, 2011 at 8:46 AM, Mark Meyer wrote:
> Hi.
> I'm having problems calling clojure code from Java. Basically I deftype'd
> (deftype HexSolver []
> Solver
> (solve [this grid] (search (process-grid grid
> and somewhere near the top of that file file
> (defn search [foo] ...)
> t
Hi.
I'm having problems calling clojure code from Java. Basically I deftype'd
(deftype HexSolver []
Solver
(solve [this grid] (search (process-grid grid
and somewhere near the top of that file file
(defn search [foo] ...)
the very top places this in the namepsace (:ns hexadoku (:gen-cla
2010/12/22 Mark Engelberg
> I've decided to go with the old gen-class approach (mainly so I can
> take advantage of the "state" option).
> I'm running into a problem implementing Iterable.
> The following lines in gen-class create a conflict:
> :implements [java.lang.Iterable]
> :methods [[it
I've decided to go with the old gen-class approach (mainly so I can
take advantage of the "state" option).
I'm running into a problem implementing Iterable.
The following lines in gen-class create a conflict:
:implements [java.lang.Iterable]
:methods [[iterator [] java.util.Iterator]]
It com
2010/12/22 Chas Emerick
>
> On Dec 22, 2010, at 4:58 AM, Laurent PETIT wrote:
>
> > There's also this issue raised in the bug tracker (by Chas Emerick I
> presume ?) which is about adding a nice java facade for this kind of interop
> (and thus also ensuring some independance towards clojure inter
On Dec 22, 2010, at 4:58 AM, Laurent PETIT wrote:
> There's also this issue raised in the bug tracker (by Chas Emerick I presume
> ?) which is about adding a nice java facade for this kind of interop (and
> thus also ensuring some independance towards clojure internals).
>
> What about bringin
Mark Engelberg writes:
> Looks easy, but your dance and speak methods don't return a value
> which leaves a question in my mind...
>
> If the protocol implementation actually returns a value, do you have
> to explicitly typecast it in Java from Object into the desired type?
Yep, certainly. A Cl
2010/12/22 Mark Engelberg
> Looks easy, but your dance and speak methods don't return a value
> which leaves a question in my mind...
>
> If the protocol implementation actually returns a value, do you have
> to explicitly typecast it in Java from Object into the desired type?
>
Yes
--
You rec
Looks easy, but your dance and speak methods don't return a value
which leaves a question in my mind...
If the protocol implementation actually returns a value, do you have
to explicitly typecast it in Java from Object into the desired type?
Thanks,
Mark
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Mark Engelberg writes:
> Are there any examples available of creating a compiled
> class/interface with deftype and defprotocol, and using these from
> Java?
It's pretty straightforward and works exactly how you might expect it
to.
Create a new project:
$ lein new interop
Define a type and
Hi,
Am 22.12.2010 um 11:15 schrieb Mark Engelberg:
> Are there any examples available of creating a compiled
> class/interface with deftype and defprotocol, and using these from
> Java?
Protocols also define an interface which can be implemented by classes. For
deftype this happens when you spe
Are there any examples available of creating a compiled
class/interface with deftype and defprotocol, and using these from
Java?
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Note that po
Hi,
Am 22.12.2010 um 10:56 schrieb Mark Engelberg:
> On Wed, Dec 22, 2010 at 1:52 AM, Meikel Brandmeyer wrote:
>> It is a little ugly, but works with any function, in particular static and
>> protocol functions. If you want a less rough interface, you can still go the
>> gen-class route from t
2010/12/22 Mark Engelberg
> On Wed, Dec 22, 2010 at 1:52 AM, Meikel Brandmeyer wrote:
> > It is a little ugly, but works with any function, in particular static
> and protocol functions. If you want a less rough interface, you can still go
> the gen-class route from the article. But this will co
gt; http://java.dzone.com/articles/java-clojure-interop-calling
> > which dates back to Clojure 1.1.
> >
> > Seems like a lot of changes have occurred since then -- static
> > functions, protocols, etc. So has the "calling Clojure from Java"
> > story ch
On Wed, Dec 22, 2010 at 1:52 AM, Meikel Brandmeyer wrote:
> It is a little ugly, but works with any function, in particular static and
> protocol functions. If you want a less rough interface, you can still go the
> gen-class route from the article. But this will come at the cost of one level
>
h dates back to Clojure 1.1.
>
> Seems like a lot of changes have occurred since then -- static
> functions, protocols, etc. So has the "calling Clojure from Java"
> story changed with Clojure 1.3? If so, can anyone provide pointers to
> some recent examples?
If you just
then -- static
functions, protocols, etc. So has the "calling Clojure from Java"
story changed with Clojure 1.3? If so, can anyone provide pointers to
some recent examples?
Thanks,
Mark
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Yes, it helped! Thank you!
To make the story complete I put here complete code:
semantic/hello.clj:
(ns semantic.hello
(:gen-class
:name semantic.hello
:methods [[sayhello [] void]
[sayhello_arg [String] void]]))
(defn -sayhello [this] (println "Hello from Clojure!"))
you'd import semantic.hello
then in your java code, you
would first create it by doing new semantic.hello()
then you can call it form java by doing
.sayhello() without the -
you also need to define your sayhello differently I think.
it needs to be (defn -sayhello [this] (println "Hello from
cl
Hi,
On 15 Aug., 21:41, sebastien wrote:
> Unfortunetly it doesn't work, pointing to h.hello() and saying "cannot
> find symbol".
>
> Any suggestions?
First the method is called sayhello. Not just hello. Then you have to
declare the method in the gen-class clause.
(ns semantic.hello
(:gen-cla
I tried to compile hello.clj with "lein compile" and with "(compile
'semantic.hello)", and also with old versions of clojure.jar and
clojure.contrib.jar (current one is 1.2-beta1), but it all gave the
same result.
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> Can you run:
> javap YourClass.class
> and give us the result?
Here it is:
public class semantic.hello extends java.lang.Object {
public static {};
public semantic.hello();
public java.lang.Object clone();
public int hashCode();
public java.lang.String toString();
>
>
> Any suggestions?
>
>
Can you run:
javap YourClass.class
and give us the result?
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Hi Meikel,
Unfortunetly it doesn't work, pointing to h.hello() and saying "cannot
find symbol".
^
Same with my Eclipse, which says that import "semantic" cannot be
resolved, though both package and class are in the bin (classes)
directory.
Hi,
Am 15.08.2010 um 18:04 schrieb sebastien:
> I understand that after AOT compilation Clojure namespaces and
> functions became completely normal Java classes and can be called from
> any Java code, is it correct? If so, how will look like this call? For
> example, I have clojure module:
>
> (
I understand that after AOT compilation Clojure namespaces and
functions became completely normal Java classes and can be called from
any Java code, is it correct? If so, how will look like this call? For
example, I have clojure module:
(ns semantic.hello
(:gen-class))
(defn -sayhello [] (print
I'm new to clojure, and I'm trying to figure out how to integrate it
into a somewhat large Java codebase. At a particular point the the
program's execution, I'd like to spin up a thread with a swank server
on it, but the following code doesn't seem to work. Can I get a
pointer from the experienced
On 23 jan, 03:00, Stuart Sierra wrote:
> On Jan 22, 6:51 pm, Peter Wolf wrote:
>
> > However, if there is only one Clojure image used for references and the
> > like, what happens if someone calls an infinite loop, or infinite
> > recursion, in a file. Does the Clojure server hang/blow up?
>
Hi,
On 23 jan, 01:43, Peter Wolf wrote:
> Hi Laurent,
> 1) Does Eclipse use the server for resolving references?
Currently, the only resolved references are those that come from a
clojure environment launched by the user. So yes.
When time comes to resolve references for the needs of the editor
Thanks for the explanation Stuart,
So it seems that all the Swank Clojure IDEs rely on files only
containing "safe" code. I guess that's OK provided everyone understands
this.
Is is any way to only process the def's? For example processing the
following would only define the symbol "foo", b
On Jan 22, 6:51 pm, Peter Wolf wrote:
> However, if there is only one Clojure image used for references and the
> like, what happens if someone calls an infinite loop, or infinite
> recursion, in a file. Does the Clojure server hang/blow up?
If you code an infinite loop, the SWANK server will
Hi Laurent,
My questions and current beliefs are:
1) Does Eclipse use the server for resolving references?
2) Is the server visible to the user, or hidden inside Eclipse?
3) Does the server call load-file?
4) Can the user break the server with bogus code in a file?
5) What happens if a file has
I'll also reply inline ... ->
On 23 jan, 00:51, Peter Wolf wrote:
> Thanks for the lengthy reply Laurent, Replies in-line
>
> lpetit wrote:
> > Peter,
>
> > We asked us the same question some weeks ago, on clojuredev.
>
> > We took the path to follow how eclipse launches a java application
> >
Thanks for the lengthy reply Laurent, Replies in-line
lpetit wrote:
> Peter,
>
> We asked us the same question some weeks ago, on clojuredev.
>
> We took the path to follow how eclipse launches a java application
> when the user requires it to test it.
> So we created a customized "launch config
Peter,
We asked us the same question some weeks ago, on clojuredev.
We took the path to follow how eclipse launches a java application
when the user requires it to test it.
So we created a customized "launch configuration" (sorry, eclipse
jargon), that is just a classical eclipse java launcher w
On Thu, Jan 22, 2009 at 4:43 PM, Peter Wolf wrote:
>
> This is a rejuvenation of the old "calling Java from Clojure" thread
>
> I have been looking at the solutions from Mark
> /
> 1) From a Java application, read a text file containing Clojure code
> and invoke specific functions it defines
This is a rejuvenation of the old "calling Java from Clojure" thread
I have been looking at the solutions from Mark
/
1) From a Java application, read a text file containing Clojure code
and invoke specific functions it defines from Java code.
2) Compile Clojure code to bytecode and use
On Jan 3, 8:13 pm, "Mark Volkmann" wrote:
> I'd like to learn how to invoke Clojure code from a Java application.
> I see at least two options.
>
> 1) From a Java application, read a text file containing Clojure code
> and invoke specific functions it defines from Java code.
Here's how I do it:
I'd like to learn how to invoke Clojure code from a Java application.
I see at least two options.
1) From a Java application, read a text file containing Clojure code
and invoke specific functions it defines from Java code.
2) Compile Clojure code to bytecode and use it from a Java application
ju
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