[Resolved] Error log4j:WARN during startup

[casertap]

The error:
log4j:WARN No such property [follow] in org.apache.log4j.ConsoleAppender.
which appear on startup of argouml since the version 0.26 is problematic for me because it makes crash my javaagent.

log4j:WARN No such property [follow] in org.apache.log4j.ConsoleAppender.
Fatal error on startup. ArgoUML failed to start.
java.lang.NullPointerException
at java.util.ResourceBundle.getBundle(Unknown Source)
at org.tigris.gef.util.Localizer.addResource(Unknown Source)
at org.tigris.gef.util.Localizer.addResource(Unknown Source)
at org.tigris.gef.util.Localizer.addResource(Unknown Source)
at org.argouml.i18n.Translator.init(Unknown Source)
at org.argouml.application.Main.initTranslator(Unknown Source)
at org.argouml.application.Main.initPreinitialize(Unknown Source)
at org.argouml.application.Main.main(Unknown Source)

I use this command: java -Xms1G -Xmx4G -Xss1G -javaagent:myagent.jar -jar argouml.jar

What does the warning means ?
Maybe my exception can help developper of the projet to find the problem and correct it.

[ThomasNeustupny]

Which version do you use? Does this also occurs when you launch ArgoUML in the normal way (using the start script) or with you command line without the "-javaagent:myagent.jar" part?

[casertap]

Effectively I get the same warning if I start without the agent.
so I found that the ressources is not found by the program (maybe the classpath).

So I tried some experiment without my agent.
The Argouml 0.28.1 is composed of a root directory with all the Jars it needs
and a /ext/ directory with additional Jars files.

The only way, for me, to correct the error is to move the
anarres-cpp-no-dependencies-1.2.3.jar FROM /ext/ to the root.
I didn't succed with the java -cp option (this is very strange).
Moreover I didn't succed to remove the error using my agent.
I change the Manifest etc ... but nothing works.

I took a look into the anarres-cpp-no-dependencies-1.2.3.jar and I think that
the log4j.properties file is problematic.
maybe these lines:

# Set root logger level to DEBUG and its only appender to stdout.
log4j.rootLogger=INFO, stdout

# stdout is set to be a ConsoleAppender.
log4j.appender.stdout=org.apache.log4j.ConsoleAppender

I check and the file log4j-1.2.6.jar is declared in my manifest (so it would be ok)

I havn't found the solution yet.

[ThomasNeustupny]

The file anarres-cpp-no-dependencies-1.2.3.jar is used for C++ import and generation. If you don't need support for C++, then maybe a solution for you would be to (re)move the following two files from your ext directory:

anarres-cpp-no-dependencies-1.2.3.jar
argo_cpp.jar

BTW, I got used to clean up the ext directory to keep ArgoUML a little bit lighter. But don't remove the argouml-diagrams-sequence.jar file, because this contains the new sequence diagram implementation. With just this file in the ext dir, ArgoUML would still be a full UML design application, because only code generation, reverse engineering and other GUI languages would be missing.

However, I still can't reproduce your problem.

[casertap]

thanks you very much ThomasNeustupny, you solve the problem of the "log4j:WARN No such property [follow] in org.apache.log4j.ConsoleAppender."

But the exception is still here so the exception have no relation with the warning

Even if I start my program with a empty agent (empty premain, empty transform) the exception bellow appear:

Fatal error on startup. ArgoUML failed to start.
java.lang.NullPointerException
at java.util.ResourceBundle.getBundle(ResourceBundle.java:960)
at org.tigris.gef.util.Localizer.addResource(Localizer.java:199)
at org.tigris.gef.util.Localizer.addResource(Localizer.java:183)
at org.tigris.gef.util.Localizer.addResource(Localizer.java:171)
at org.argouml.i18n.Translator.init(Translator.java:124)
at org.argouml.application.Main.initTranslator(Main.java:280)
at org.argouml.application.Main.initPreinitialize(Main.java:270)
at org.argouml.application.Main.main(Main.java:147)

Somebody have an idea why this exception appear with an agent and not in the usual runtime.

[ThomasNeustupny]

After inspecting the code I'm pretty sure that in the agent case the call Localizer.class.getClassLoader() returns null. So class loading is different then. The class (org.tigris.gef.util.)Localizer is located in gef-<version>.jar in the ArgoUML directory btw. Try to provide a similar classpath environment when running with that (to me unknown) agent. I don't know how to do that though.

[casertap]

I found my error.

It seems that you must not write all the jar file of the argouml software in the Manifest of the agent.
First my manisfest was :

Manifest-Version: 1.0
Premain-Class: MyAgent
Can-Retransform-Classes: true
Can-Redefine-Classes: true
Boot-Class-Path: antlr-2.7.7.jar argouml.jar argouml-mdr.jar argouml-model.jar
asm-3.2.jar asm-commons-3.2.jar asm-util-3.2.jar commons-cli.jar commons-logging-1.0.2.jar dt.jar gef-0.13.jar java-interfaces.jar
jedit.jar jmi.jar jmiutils.jar log4j-1.2.6.jar mdrapi.jar mof.jar nbmdr.jar ocl-argo-1.1.jar openide-util.jar swidgets-0.1.4.jar
toolbar-1.4.1-20071227.jar MyAgent.jar Azureus2.jar apple-extensions.jar commons-cli.jar log4j.jar swt.jar

Finally I change it to:

Manifest-Version: 1.0
Premain-Class: MyAgent
Can-Retransform-Classes: true
Can-Redefine-Classes: true
Boot-Class-Path: asm-3.2.jar asm-analysis-3.2.jar asm-commons-3.2.jar MyAgent.jar

And now it works.

Thanks everybody
sorry for the inconvenience

[casertap]

Sorry thanks ThomasNeustupn your the only one who helped me.