Sorry, typo:
5) Navigate to your Classes node -> <default package>, open
module-info.java and add the following line:
requires org.apache.logging.log4j.core;
should say:
5) Navigate to your Classes node -> <default package>, open
module-info.java and add the following line:
requires *org.apache.logging.log4j*;
On Thu, Oct 4, 2018 at 8:52 AM Pete Whelpton <peedee...@gmail.com> wrote:
> Hi Emma,
>
> Yes, I think there is something awry with the log4j-api-2.11.1.jar. To
> get it working just using ModulePath, I first:
>
> 1) Opened the log4j-api-2.11.1.jar file in Archive Manager
>
> 2) Copied the module-info.class file from /META-INF/versions/9/ folder to
> the root of the archive
>
> After both the api and core jars are (re)added to your module path, you
> can use "requires org.apache.logging.log4j;" in your own module-info
> file. Netbeans will find this in code completion. :)
>
> What I believe happens during classloading is first the release specific
> location is checked, and if not it falls back to the default (root)
> location. Loading via ModulePath requires a compiled module-info in the
> "base" folder of the classes.
> In the case of the log4j-api-2.11.1.jar file, the release specific
> location (/META-INF/versions/9/) contains only only one class -
> presumably the one and only class with Java9 specific code.
>
> However, when class loading falls back to the root to find the other
> classes, there is no module-info there, which is why I believe it fails.
>
> As to whether best practice would be to have the whole
> org.apache.logging.log4j under /META-INF/versions/9/, or to have a
> module-info in the root as I did, I don't know enough to tell you.
>
>
>
> Full steps below to create the project and reference the clases, if you
> need them:
>
> 1) Netbeans -> File -> New Project -> Java Modular Project call it
> "Log4j2TestCasePDW" and platform JDK10
>
> 2) Right click Project node -> New -> Module and call it "Log4j2TestCase".
>
> 3) Right click Project node -> Properties -> Libraries and the click
> "Browse" next to the library folder.
> Accept the defaults to create a /lib folder and to copy libraries
> to the folder
>
> 4) Still in the Libraries properties, using the ellipsis (...) next to
> ModulePath, choose "Add JAR/Folder" and add the following two .jar files
> (making sure "copy to library folder" is checked:
> log4j-api-2.11.1.jar
> log4j-core-2.11.1.jar
>
> N.B. For any Netbeans devs reading, there seems to be a bit of a minor
> bug in NB here - if you highlight both and try and add them both at the
> same time, one JAR will go in ModulePath and one in ClassPath.
>
> 5) Navigate to your Classes node -> <default package>, open
> module-info.java and add the following line:
> requires org.apache.logging.log4j.core;
>
> N.B. If you press ctrl-space to bring up code completion after typing
> "requires", you will see the modules you can import. the
> "org.apache.logging.log4j"
>
> 6) Copy your test package and .java file under the Classes node
>
> 7) Right click -> Run on your Log4j2TestCase.java file
>
>
> You will get a console output similar to:
>
> "02:20:00.367 [main] ERROR log4j2testcase.Log4j2TestCase -
> *** Log4j2 error message"
>
>
> Hope that helps,
>
> P
>
>
> On Wed, Oct 3, 2018 at 12:51 PM Emma Atkinson <emma.atkins...@gmail.com>
> wrote:
>
>> To recreate the test case and Netbeans set up.
>>
>> - I created a Java Application using the new project function. I set
>> it up to run on JDK 10.
>>
>>
>> - I added a module-info.java file using a RMB on Project Navigator >
>> Log4j2TestCase > Source Packages > New > Java Module Info...
>>
>>
>> - I created a Library entry (named Apache Log4j2 2.11) that refers to
>> the log4j-api-2.11.1.jar via Tools > Libraries pressing New Library...
>> button. I only added the one jar, no javadoc, no sources.
>>
>>
>> - Using a RMB on the Project Navigator > Log4j2TestCase > Libraries >
>> Add Library... I added the Library entry named Apache Log4j2 2.11.
>>
>>
>> - Using a RMB on the Project Navigator > Log4j2TestCase > Libraries >
>> Add JAR/Folder ... I added a separate reference to log4j-api-2.11.1.jar
>> and
>> log4j-core-2.11.1.jar. Netbeans put the log4j-core-2.11.1.jar on the
>> modulepath and added a line to my module-info.java.
>>
>>
>> - RMB on Project Navigator > Log4j2TestCase selected Properties >
>> Libraries. I moved the reference to the jar files down into the
>> classpath.
>>
>>
>> - I edited the module-info.java file to delete the automatically
>> added line
>> * requires *org.apache.logging.log4j.core*;*
>>
>>
>> - I added two import statements to the Log4j2TestCase.java
>> (containing the main entry point)
>> * import* org.apache.logging.log4j.LogManager;
>> * import* org.apache.logging.log4j.Logger;
>>
>> As it stands Log4j will not find its configuration XML file so it will
>> say that it is using default setting which means it output errors and above
>> and suppresses messages that are warnings, info and debug.
>>
>> - I created an object called LOGGER.
>>
>>
>> - I created a LOGGER.error("some text "); so that it would output to
>> the console under default settings if it ran.
>>
>> But first we need to build the application.
>>
>> - Select the module-info.java file and using a RMB menu option to
>> Compile File. The ant build script will run and eventually output an
>> error
>> message saying that it cannot find the module log4j.api.
>>
>> I hope this is comprehensive enough.
>>
>>
>>
>>
