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Add JAR to Birt Classloader at runtime through Java code in Birt 2.5.1

kiranv

Hello All, 
 
I am having a J2EE web application to generate Birt reports. 
I want to add a JAR file at runtime thru Java code to the birt class loaders i.e the PLATFORM for BIRT 2.5.1 engine. 
 
My problem is that I am using Tribix Emitters for Birt 2.5.1 - <a class='bbc_url' href='http://sourceforge.net/projects/tribix/files/'>Browse Tribix - Extended Emitters for BIRT Files on SourceForge.net</a> to generate Excel Charts. So I just have to copy the files "org.uguess.birt.report.engine.emitter.xls_2.5.1.201001221050.jar" and "org.uguess.birt.report.engine.common_1.1.1.201001221050.jar" in the "WEB-INFplatformplugins" folder and it works perfectly fine. However when I have to generate a data report in excel (without charts) then the cells are merged and cell width and height is manipulated due to which printouts etc of the reports give a problem. 
 
So basically I want to load the 2 Tribix emitter JARs in the Birt Class loader at runtime and once chart generation is done then again unload them. 
 
I guess this can be achieved by org.eclipse.birt.core.framework.URLClassLoader Class and it also has a close() method. However I am not able to achieve it. 
 
Your help with the source code is reallly really appreciated. 
 
Thanks in advance, 
Kiran

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Comments

JasonW

If you are using the engine just add something like:

config.getAppContext().put(EngineConstants.WEBAPP_CLASSPATH_KEY, "c:/jars/mjo.jar");

Where config is an instance of EngineConfig.

Jason

kiranv

I removed the JAR File org.uguess.birt.report.engine.emitter.xls_2.5.1.201001221050.jar from the WEB-INFplatformplugins folder .
Then added the piece of code
config.getAppContext().put(EngineConstants.WEBAPP_CLASSPATH_KEY, "C:org.uguess.birt.report.engine.emitter.xls_2.5.1.201001221050.jar");
However still it is not working.

Somehow I feel that to use Tribix the jar has to physically reside in WEB-INFplatformplugins folder and we cannot add it dynamically to the Platform

I even tried by
Map appContext = task.getAppContext();
appContext.put(EngineConstants.WEBAPP_CLASSPATH_KEY, "C:/org.uguess.birt.report.engine.emitter.xls_2.5.1.201001221050.jar");
task.setAppContext(appContext);

This also loaded the excel file with data but without the chart

JasonW

see 
 
<a class='bbc_url' href='http://www.birt-exchange.org/forum/deploying-integrating-birt-report-engine-applications/18572-access-chart-image-jpg-svg-generated-birt-report-java-code.html#post60813'>http://www.birt-exchange.org/forum/deploying-integrating-birt-report-engine-applications/18572-access-chart-image-jpg-svg-generated-birt-report-java-code.html#post60813</a>