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From Simon Pepping <spepp...@leverkruid.eu>
Subject Re: Building fop from source using qdox 1.11
Date Fri, 26 Aug 2011 18:09:38 GMT
Earlier I wrote:

I took the source code of fop-1.0, replaced lib/build/qdox-1.6.3.jar
with lib/build/qdox-1.12.jar from fop's development code, and ran ant
compile and ant junit. Both were successfull. There is a warning about
a deprecated method, but that is not fatal. The answer to your
question is: yes, fop-1.0 can be successfully built with qdox-1.12.

I now did as you describe below, on a debian testing system, and got
your error indeed.

>ls -l /usr/share/java/qdox.jar
lrwxrwxrwx 1 root root 13 mei  3 23:53 /usr/share/java/qdox.jar -> qdox-1.12.jar

Conclusion: There is a difference between lib/build/qdox-1.12.jar in
fop's development code and /usr/share/java/qdox-1.12.jar in debian

Looking at the code, the NPE is generated by the call
method.getReturns().isVoid(). method is not null, because it has been
referenced in the preceding line. So method.getReturns() is null.
method.getReturns() is the deprecated method, but one would expect
that such a method would always return a non-null object, since any
method has a return type, even if void.

You can check why debian's qdox-1.12 is different from fop's, or patch
fop's code at
(src/codegen/java/org/apache/fop/tools/EventProducerCollector.java) to
use method.getReturnType() instead of method.getReturns(). FOP's
development code uses method.getReturnType() and qdox-1.12.


On Fri, Aug 26, 2011 at 01:45:04PM +0200, Mathieu Malaterre wrote:
> Dear all,
>   I am trying to build fop from source using qdox 1.11. On my debian
> system here is what I did:
> $ wget http://mir2.ovh.net/ftp.apache.org/dist//xmlgraphics/fop/source/fop-1.0-src.tar.gz
> $ tar xfz fop-1.0-src.tar.gz
> $ cd fop-1.0
> $ export CLASSPATH=/usr/share/java/qdox.jar:/usr/share/java/commons-io.jar
> $ ant resourcegen
> This leads to the following error (*). I would like to know whether:
> - building fop from source using qdox version != 1.6.3 is actually supported ?
> - did anyone tried to compile fop with a more recent qdox version ?
> If not, where can I download source code for qdox 1.6.3, I could not
> find it on the official website:
> http://snapshots.repository.codehaus.org/com/thoughtworks/qdox/qdox/
> Thank you very much for your time,
> -Mathieu
> (*)
> /tmp/test/fop-1.0/build.xml:374: java.lang.NullPointerException
> 	at org.apache.fop.tools.EventProducerCollector.createMethodModel(EventProducerCollector.java:142)
> 	at org.apache.fop.tools.EventProducerCollector.processEventProducerInterface(EventProducerCollector.java:130)
> 	at org.apache.fop.tools.EventProducerCollector.scanFile(EventProducerCollector.java:100)
> 	at org.apache.fop.tools.EventProducerCollectorTask.processFileSets(EventProducerCollectorTask.java:213)
> 	at org.apache.fop.tools.EventProducerCollectorTask.execute(EventProducerCollectorTask.java:69)
> 	at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:291)
> 	at sun.reflect.GeneratedMethodAccessor7.invoke(Unknown Source)
> 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
> 	at java.lang.reflect.Method.invoke(Method.java:616)
> 	at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
> 	at org.apache.tools.ant.Task.perform(Task.java:348)
> 	at org.apache.tools.ant.Target.execute(Target.java:390)
> 	at org.apache.tools.ant.Target.performTasks(Target.java:411)
> 	at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1360)
> 	at org.apache.tools.ant.Project.executeTarget(Project.java:1329)
> 	at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
> 	at org.apache.tools.ant.Project.executeTargets(Project.java:1212)
> 	at org.apache.tools.ant.Main.runBuild(Main.java:801)
> 	at org.apache.tools.ant.Main.startAnt(Main.java:218)
> 	at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280)
> 	at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109)
> Total time: 13 seconds
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