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NullPointerException in jar from Eclipse [message #812224]

Sat, 03 March 2012 07:38

Eclipse User

I create a reporting API project and it runs fine under Eclipse. I export this using the Eclipse Export/Runnable JAR comand. When I execute this JAR (java -jar myjar.jar), I get an "Exception in thread "main" java.lang.NullPointerException".

I'm new to BIRT.

BIRT is 3.7.2, Eclipse is Indigo.

The problems seems to be at the line:
IReportEngineFactory factory = (IReportEngineFactory) Platform
.createFactoryObject(IReportEngineFactory.EXTENSION_REPORT_ENGINE_FACTORY);

It appears in a simple demo program also.

Can you please advise me:

1. what might be the cause of this error?
2. what is the reoommended means of getting an executable JAR file for BIRT and for executing it (the Runnable JAP seems to contain lots of possibly unnecessary JARs)?

May thanks,

Re: NullPointerException in jar from Eclipse [message #812653 is a reply to message #812224]

Sat, 03 March 2012 23:47

Eclipse User

I am much clearer now.

If I create a Runnable JAR and execute it with the java -jar Myjar.jar command, I get a NullPointerException.
If I execute the same jar with the command java -cp "Myjar.jar;F:/Eclipse/birt-runtime-3_7_2/ReportEngine/lib" path.to.mainclass it works. This command also works with a regular exported jar (not a runnable JAR).

If I remove the classpath reference to the birt runtime, the command returns a NoClassDefFoundError

If not sure why the Runnable JAR needs the classpath reference, or why it doesn't work in the java -jar format - the Runnable JAR contains many of the runtime classes.

Re: NullPointerException in jar from Eclipse [message #1044160 is a reply to message #812224]

Thu, 18 April 2013 11:03

Eclipse User

If anyone else comes across this issue, please make sure you choose the following option when exporting the package.

* Package required libraries into generated JAR

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