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From Emma Atkinson <emma.atkins...@gmail.com>
Subject Re: Netbeans ant build script not finding Log4j2 V2.11.1 module-info.class
Date Wed, 31 Oct 2018 23:14:59 GMT
Hi Geertjan

Thank you for your email.  I tried it out in a few ways.

Test 1
I build my test app which looks almost identical to yours.  I set project
properties to use JDK-11 for both source and build
I found the application built and ran within the Netbeans environment with
Netbeans 10vc2 using the *--jdkhome* set to running on JDK-11.

Test 2
I also tried running the jar file in the dist folder from the command
line.
*prompt> <path-to>/jdk-11/bin/java -jar dist/JavaApplicationXXII.jar*

That gave an error message







*Exception in thread "main" java.lang.NoClassDefFoundError:
org/apache/logging/log4j/LogManager        at
javaapplicationXXII.JavaApplicationXXII.<clinit>(JavaApplicationXXII.java:17)Caused
by: java.lang.ClassNotFoundException:
org.apache.logging.log4j.LogManager        at
java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:582)
at
java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
... 1 more*


Test 3
I also tried to build the application with jlink packaging.
This may not be an error: I do not know if one is permitted to use an
automatic module in a jlink packaged build.

During the clean & build, the following error line appeared at the end of
the clean & build process

...* <*snip> ...

*Error: automatic module cannot be used with jlink:
org.apache.logging.log4j.core from
file:///<path-to>/Log4j2/apache-log4j-2.11.1-bin/log4j-core-2.11.1.jarResult:
1*



*-post-deploy:deploy:jar:BUILD SUCCESSFUL (total time: 1 second)*

I hope there is enough information to be useful.  Please ask if you would
like me to provide more.

Regards

Emma


On Wed, 31 Oct 2018 at 09:05, Geertjan Wielenga <
geertjan.wielenga@googlemail.com> wrote:

> For me, it works, I can use the module-path, together with this in
> module-info:
>
> module org.mycompany {
>     requires org.apache.logging.log4j;
> }
>
> And this in the Java source file:
>
> import org.apache.logging.log4j.LogManager;
> import org.apache.logging.log4j.Logger;
> public class MyApp {
>     public static final Logger LOGGER = LogManager.getLogger();
>     public static void main(String[] args) {
>         LOGGER.error("\n *** Log4j2 error message\n");
>     }
> }
>
> With the JAR on the module-path.
>
> Thanks,
>
> Gj
>
>
> On Wed, Oct 31, 2018 at 9:51 AM Geertjan Wielenga <
> geertjan.wielenga@googlemail.com> wrote:
>
>> Hi Emma,
>>
>> Please confirm that your scenario works now in 10vc2:
>>
>> https://cwiki.apache.org/confluence/display/NETBEANS/10vc2
>>
>> Gj
>>
>> On Thu, Oct 4, 2018 at 11:56 AM Emma Atkinson <emma.atkinson2@gmail.com>
>> wrote:
>>
>>> Hey guys,
>>> What a lovely surprise! I was just about to begin working out the
>>> command line options.
>>>
>>> I'll take a look at the pull request to see if I can learn something.
>>>
>>> Thank you (Denk u wel)
>>> Emma
>>>
>>> On 08:11, Thu, 4 Oct 2018 Geertjan Wielenga,
>>> <geertjan.wielenga@googlemail.com.invalid> wrote:
>>>
>>>> https://github.com/apache/incubator-netbeans/pull/941
>>>>
>>>> We've identified the problem and done work on fixing it.
>>>>
>>>> Gj
>>>>
>>>> On Wed, Oct 3, 2018 at 1:55 PM Emma Atkinson <emma.atkinson2@gmail.com>
>>>> wrote:
>>>>
>>>>> I will try without using Netbeans but I do not have time to work on
>>>>> this until tomorrow.
>>>>> Thank you for devoting your time to helping me solve this.
>>>>>
>>>>> Emma
>>>>>
>>>>>
>>>>> On Wed, 3 Oct 2018 at 12:29, Geertjan Wielenga <
>>>>> geertjan.wielenga@googlemail.com> wrote:
>>>>>
>>>>>> Well, I'd suggest to first get it to work without any tooling at
all.
>>>>>> I.e., forget NetBeans for the moment and use the command line to
set up a
>>>>>> simple Java 9 multi-release app that makes use of Log4J. Possibly
the
>>>>>> problem is with Log4J and that's what you can find out by creating
such an
>>>>>> application and for help you could join the Log4J mailing list. I.e.,
if
>>>>>> something doesn't work outside NetBeans it won't work within NetBeans
>>>>>> either.
>>>>>>
>>>>>> Gj
>>>>>>
>>>>>>
>>>>>> On Wed, Oct 3, 2018 at 1:13 PM Emma Atkinson <
>>>>>> emma.atkinson2@gmail.com> wrote:
>>>>>>
>>>>>>> Screenshot.png shows how I have set up Netbeans.  I think you
can
>>>>>>> see everything.
>>>>>>>
>>>>>>> I normally use the *import* org.apache.logging.log4j.Logger and
>>>>>>> *import* org.apache.logging.log4j.LogManager.  The Log4j2
>>>>>>> module-info.class file exports *org.apache.logging.log4j*.
>>>>>>>
>>>>>>> I have committed a version of the test case with the word logging
>>>>>>> deleted.  And then returned it to what I think is correct in
the subsequent
>>>>>>> commit.
>>>>>>> I have tried it every way, with and without the classpath entries.
>>>>>>> BTW adding a jar to both the modulepath and classpath has been
a bit hit
>>>>>>> and miss (ignoring adding log4j-api.jar if it is already on the
modulepath)
>>>>>>> so I used a Library entry for the module path and explicitly
added the jars
>>>>>>> to the classpath.
>>>>>>>
>>>>>>> Adding the classpath entries with
>>>>>>> *import* org.apache.logging.log4j.Logger
>>>>>>> *import* org.apache.logging.log4j.LogManager
>>>>>>>
>>>>>>> means the editor finds the classes Logger and LogManager as you
>>>>>>> would expect.
>>>>>>> The Compile File error message is that it cannot find the module
>>>>>>> log4j.api.
>>>>>>> https://github.com/cosmiczoo/Log4j2TestCase latest commit is
as
>>>>>>> close as I can get.
>>>>>>>
>>>>>>>
>>>>>>> On Wed, 3 Oct 2018 at 11:15, Geertjan Wielenga
>>>>>>> <geertjan.wielenga@googlemail.com.invalid> wrote:
>>>>>>>
>>>>>>>> I also see this on
>>>>>>>> https://logging.apache.org/log4j/2.0/download.html:
>>>>>>>>
>>>>>>>> To use Log4j 2 in your application make sure that both the
API and
>>>>>>>> Core jars are in the application’s classpath. Add the dependencies
listed
>>>>>>>> below to your classpath.
>>>>>>>>
>>>>>>>>
>>>>>>>>    1. log4j-api-2.11.1.jar
>>>>>>>>    2. log4j-core-2.11.1.jar
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> In short, we need instructions for how exactly to set up
the
>>>>>>>> project to match the environment that you have.
>>>>>>>>
>>>>>>>> Gj
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> On Wed, Oct 3, 2018 at 12:11 PM Geertjan Wielenga <
>>>>>>>> geertjan.wielenga@googlemail.com> wrote:
>>>>>>>>
>>>>>>>>> Shouldn't the import statements be this:
>>>>>>>>>
>>>>>>>>> import org.apache.log4j.LogManager;
>>>>>>>>> import org.apache.log4j.Logger;
>>>>>>>>>
>>>>>>>>> ...and not this:
>>>>>>>>>
>>>>>>>>> import org.apache.logging.log4j.LogManager;
>>>>>>>>> import org.apache.logging.log4j.Logger;
>>>>>>>>>
>>>>>>>>> ...if you're using log4j-1.2-api-2.11.1.jar?
>>>>>>>>>
>>>>>>>>> Gj
>>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Wed, Oct 3, 2018 at 11:56 AM Emma Atkinson <
>>>>>>>>> emma.atkinson2@gmail.com> wrote:
>>>>>>>>>
>>>>>>>>>> I cannot find a way to make this work, I hope you
can help.  I
>>>>>>>>>> should be happy to be pointed to an existing answer
>>>>>>>>>>
>>>>>>>>>> *The Problem*
>>>>>>>>>> I have a very simple Java application demonstrating
the problem I
>>>>>>>>>> am having with using the latest Log4j2 V2.11.1 as
a module (log4j.api) and
>>>>>>>>>> building it in Netbeans.  The example compiles, builds
and runs when I use
>>>>>>>>>> the classpath, but cannot compile the module-info.java
file when I use the
>>>>>>>>>> modulepath. I have uploaded the code and Netbeans
files at the following
>>>>>>>>>> link:
>>>>>>>>>>
>>>>>>>>>> https://github.com/cosmiczoo/Log4j2TestCase
>>>>>>>>>>
>>>>>>>>>> Log4j2 V2.11.1 is a Multi-release JAR (MR-JAR). 
The
>>>>>>>>>> module-info.class file is in log4j-api-2.11.1.jar
under the folder
>>>>>>>>>> META-INF/versions/9, which seems correct.
>>>>>>>>>>
>>>>>>>>>> The Netbeans editor can see the module log4j.api
because it
>>>>>>>>>> appears in the drop-down menu of completion suggestions
and does not have
>>>>>>>>>> wiggly red line under it.  My simple test program
has a module-info.java
>>>>>>>>>> file that requires log4j.api and nothing else.  This
bit works as I would
>>>>>>>>>> expect.
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> I have located an unanswered question on StackOverflow
asking a
>>>>>>>>>> similar question
>>>>>>>>>> https://stackoverflow.com/questions/50568139/netbeans-java-9-modules-log4j-2-11-module-not-found
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> *To Reproduce My Test *
>>>>>>>>>>
>>>>>>>>>> I *Clean* the project.  It completes successfully.
>>>>>>>>>> I then use a RMB option to *Compile File* the module-info.java
>>>>>>>>>> file.
>>>>>>>>>> This generates an error pointing to the line *requires
log4j.api*
>>>>>>>>>> in my module-info.java.
>>>>>>>>>>
>>>>>>>>>> <path-to>/Log4j2TestCase/src/module-info.java:7:
error: module
>>>>>>>>>> not found: log4j.api
>>>>>>>>>>     requires log4j.api;
>>>>>>>>>> 1 error
>>>>>>>>>> ZipFileIndex clearCache failed
>>>>>>>>>> <path-to>/Log4j2TestCase/nbproject/build-impl.xml:1131:
The
>>>>>>>>>> following error occurred while executing this line:
>>>>>>>>>> <path-to>/Log4j2TestCase/nbproject/build-impl.xml:358:
Compile
>>>>>>>>>> failed; see the compiler error output for details.
>>>>>>>>>>     at
>>>>>>>>>> org.apache.tools.ant.taskdefs.Javac.compile(Javac.java:1425)
>>>>>>>>>>     at
>>>>>>>>>> org.apache.tools.ant.taskdefs.Javac.execute(Javac.java:1133)
>>>>>>>>>>     at
>>>>>>>>>> org.netbeans.modules.java.source.ant.JavacTask.execute(JavacTask.java:120)
>>>>>>>>>>     at
>>>>>>>>>> org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
>>>>>>>>>>
>>>>>>>>>> and so on.  Please let me know if you want more.
>>>>>>>>>>
>>>>>>>>>> I have tried building this program under JDK-9, JDK-10
and
>>>>>>>>>> JDK-11.  My Netbeans runs on JDK-10.  I am learning
how to migrate to
>>>>>>>>>> modules by trial, error and reading.  I may have
made an error, but if I
>>>>>>>>>> have, I don't know where.
>>>>>>>>>>
>>>>>>>>>> Thanks in anticipation
>>>>>>>>>>
>>>>>>>>>> Emma
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>

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