Wednesday, 5 February 2014

OSB scripted export: Branch target offset too large for short

The weirdest thing occurred to me yesterday. I have this OSB-project in Eclipse that is working fine and can be published to the dev-server perfectly.

However, I use a release/deployment framework that does a scripted export of the OSB-configuration-jar. It copies the osb-projects to a temp-folder and creates an configuration-jar out of it. It is based on the scripts of Edwin Biemond, that I adapted in way that it can be included in my release and deployment framework for SOA, BPM and now also OSB projects.

The thing is that when I create a release of the project using my release script, I get a vague error in the exportFromWorkspace part where a java call is done to the com.bea.alsb.core.ConfigExport application of ${eclipse.home}/plugins/org.eclipse.equinox.launcher_1.2.0.v20110502.jar.

The error is:
...
     [java] Importing project located in "Aap" directory of the workspace...
     [java] Importing project located in "Noot" directory of the workspace...
     [java] Importing project located in "Mies" directory of the workspace...
     [java] com.sun.org.apache.bcel.internal.generic.ClassGenException: Branch target offset too large for short
     [java]  at com.sun.org.apache.bcel.internal.generic.BranchInstruction.dump(BranchInstruction.java:99)
     [java]  at com.sun.org.apache.bcel.internal.generic.InstructionList.getByteCode(InstructionList.java:980)
     [java]  at com.sun.org.apache.bcel.internal.generic.MethodGen.getMethod(MethodGen.java:616)
     [java]  at com.sun.org.apache.xalan.internal.xsltc.compiler.Mode.compileNamedTemplate(Mode.java:556)
     [java]  at com.sun.org.apache.xalan.internal.xsltc.compiler.Mode.compileTemplates(Mode.java:566)
     [java]  at com.sun.org.apache.xalan.internal.xsltc.compiler.Mode.compileApplyTemplates(Mode.java:818)
     [java]  at com.sun.org.apache.xalan.internal.xsltc.compiler.Stylesheet.compileModes(Stylesheet.java:615)
     [java]  at com.sun.org.apache.xalan.internal.xsltc.compiler.Stylesheet.translate(Stylesheet.java:730)
     [java]  at com.sun.org.apache.xalan.internal.xsltc.compiler.XSLTC.compile(XSLTC.java:354)
     [java]  at com.sun.org.apache.xalan.internal.xsltc.compiler.XSLTC.compile(XSLTC.java:429)
     [java]  at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:795)
     [java]  at com.bea.wli.sb.resources.xslt.XsltEntryHelper.getTemplates(XsltEntryHelper.java:818)
     [java]  at com.bea.wli.sb.resources.xslt.XsltEntryHelper.validateTree(XsltEntryHelper.java:479)
     [java]  at com.bea.wli.sb.resources.xslt.XsltEntryHelper.validate(XsltEntryHelper.java:191)
     [java]  at com.bea.wli.sb.resources.xslt.XsltTypeDef.validate(XsltTypeDef.java:65)
     [java]  at com.bea.wli.config.validation.ResourceValidator.validateContents(ResourceValidator.java:115)
     [java]  at com.bea.wli.config.validation.ResourceValidator.call(ResourceValidator.java:66)
     [java]  at com.bea.wli.config.validation.SequentialValidator.validate(SequentialValidator.java:34)
     [java]  at com.bea.wli.config.validation.ValidationService.validate(ValidationService.java:177)
     [java]  at com.bea.wli.config.impl.CoreToSessionPropagator.doValidation(CoreToSessionPropagator.java:239)
     [java]  at com.bea.wli.config.impl.CoreToSessionPropagator.handleBeforePrepare(CoreToSessionPropagator.java:118)
     [java]  at com.bea.wli.config.impl.CoreToSessionPropagator.beforePrepare(CoreToSessionPropagator.java:77)
     [java]  at com.bea.wli.config.transaction.TransactionListenerWrapper.beforePrepare(TransactionListenerWrapper.java:64)
     [java]  at com.bea.wli.config.transaction.TransactionManager.notifyBeforePrepare(TransactionManager.java:1094)
     [java]  at com.bea.wli.config.transaction.TransactionManager._prepareForCommit(TransactionManager.java:654)
     [java]  at com.bea.wli.config.transaction.TransactionManager.endTransaction(TransactionManager.java:782)
...
I found this error on serveral places related to the Xalan parser, for instance: https://issues.apache.org/jira/i#browse/XALANJ-2064. I saw that SAP's Netweaver suffers from this issue as well.

Apparently the XSL is compiled into java methods, wich in byte codes have a branch limitation of 32K. So the solution is to break-down the XSL into multiple smaller sub-templates. This makes the XSLT more modular, but unfortunately the XSLT mapper of JDeveloper can't do mappings in those sub-templates. It would be nice if Oracle Development think of something smart to do mappings using sub-templates. I have some thoughts for that...

So I split up my template into smaller bits and now my release works perfectly.

Now you could ask "OSB and XSL: why not XQuery?". Well, maybe a bit to my embarrasment: I'm not too familiar yet with XQuery, where through my SOASuite background, I'm quite loose on XSLT. And I found that the XQuery mapper in Eclipse has some limitations in the use of some simpletypes. I have xsd's with definitions that are based on simple type, with length restrictions. But the XQuery mapper did not let me map those on a simple xsd:string target-element...
And to be honest: I find XSL "cleaner" then XQuery, since it is completely XML based. But that is more a  purist-finding and maybe due to a lack of XQuery-experience...

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