Introduction and a request for help
 

Hi all;

I'm part of the Red Hat and Fedora documentation teams, and along the
way I've picked up maintainership of a few Java packages that are
important to our publishing process. Unfortunately, one of them is
causing me some trouble on F15, and I wondered if I could get some more
eyes on it please?

The package in question is FOP, which we use to generate PDFs. I can
build the current upstream version (1.0)[1], but it doesn't actually work!

Instead, FOP errors out because it can't find the event-model.xml files
that it needs. There's a bug open that shows the error message --
https://bugzilla.redhat.com/show_bug.cgi?id=689930

Comparing the package built on Koji with the binary available upstream,
it seems that there should be one of these event model files for most of
the classes in the .jar, but they're simply not created at build time.

The problem is in our EventProducerCollector, which is patched to use a
different version of qdox (1.12) from the one that upstream bundles with
FOP (1.6). Specifically, clazz.getParentClass() is always null and would
result in a null pointer exception:

/home/rlandmann/rpmbuild/BUILD/fop-1.0/build.xml:374:
java.lang.NullPointerException
at
com.thoughtworks.qdox.model.JavaMethod.getReturnTy pe(JavaMethod.java:464)
at
com.thoughtworks.qdox.model.JavaMethodDelegate.get ReturnType(JavaMethodDelegate.java:26)
at
com.thoughtworks.qdox.model.JavaMethodDelegate.get ReturnType(JavaMethodDelegate.java:166)
at
org.apache.fop.tools.EventProducerCollector.create MethodModel(EventProducerCollector.java:142)
at
org.apache.fop.tools.EventProducerCollector.proces sEventProducerInterface(EventProducerCollector.jav a:130)
at
org.apache.fop.tools.EventProducerCollector.scanFi le(EventProducerCollector.java:99)
at
org.apache.fop.tools.EventProducerCollectorTask.pr ocessFileSets(EventProducerCollectorTask.java:213)
at
org.apache.fop.tools.EventProducerCollectorTask.ex ecute(EventProducerCollectorTask.java:69)
at
org.apache.tools.ant.UnknownElement.execute(Unknow nElement.java:291)
at sun.reflect.GeneratedMethodAccessor7.invoke(Unknow n Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at
org.apache.tools.ant.dispatch.DispatchUtils.execut e(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:39 0)
at org.apache.tools.ant.Target.performTasks(Target.ja va:411)
at
org.apache.tools.ant.Project.executeSortedTargets( Project.java:1399)
at org.apache.tools.ant.Project.executeTarget(Project .java:1368)
at
org.apache.tools.ant.helper.DefaultExecutor.execut eTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Projec t.java:1251)
at org.apache.tools.ant.Main.runBuild(Main.java:809)
at org.apache.tools.ant.Main.startAnt(Main.java:217)
at org.apache.tools.ant.launch.Launcher.run(Launcher. java:280)
at org.apache.tools.ant.launch.Launcher.main(Launcher .java:109)

...except that we have a check at lines 125-127 that just quits if
clazz.getParentClass() is null.

If anyone has time and inclination to take a look for me, I'd appreciate
any tips about what to try next. I can't see why getParentClass() isn't
working on the various EventProducer classes in the source. :(

TIA
Rudi






[1] http://koji.fedoraproject.org/koji/buildinfo?buildID=246382
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Introduction and a request for help
 

Hi all;

I'm part of the Red Hat and Fedora documentation teams, and along the
way I've picked up maintainership of a few Java packages that are
important to our publishing process. Unfortunately, one of them is
causing me some trouble on F15, and I wondered if I could get some more
eyes on it please?

The package in question is FOP, which we use to generate PDFs. I can
build the current upstream version (1.0)[1], but it doesn't actually work!

Instead, FOP errors out because it can't find the event-model.xml files
that it needs. There's a bug open that shows the error message --
https://bugzilla.redhat.com/show_bug.cgi?id=689930

Comparing the package built on Koji with the binary available upstream,
it seems that there should be one of these event model files for most of
the classes in the .jar, but they're simply not created at build time.

The problem is in our EventProducerCollector, which is patched to use a
different version of qdox (1.12) from the one that upstream bundles with
FOP (1.6). Specifically, clazz.getParentClass() is always null and would
result in a null pointer exception:

/home/rlandmann/rpmbuild/BUILD/fop-1.0/build.xml:374:
java.lang.NullPointerException
at
com.thoughtworks.qdox.model.JavaMethod.getReturnTy pe(JavaMethod.java:464)
at
com.thoughtworks.qdox.model.JavaMethodDelegate.get ReturnType(JavaMethodDelegate.java:26)
at
com.thoughtworks.qdox.model.JavaMethodDelegate.get ReturnType(JavaMethodDelegate.java:166)
at
org.apache.fop.tools.EventProducerCollector.create MethodModel(EventProducerCollector.java:142)
at
org.apache.fop.tools.EventProducerCollector.proces sEventProducerInterface(EventProducerCollector.jav a:130)
at
org.apache.fop.tools.EventProducerCollector.scanFi le(EventProducerCollector.java:99)
at
org.apache.fop.tools.EventProducerCollectorTask.pr ocessFileSets(EventProducerCollectorTask.java:213)
at
org.apache.fop.tools.EventProducerCollectorTask.ex ecute(EventProducerCollectorTask.java:69)
at
org.apache.tools.ant.UnknownElement.execute(Unknow nElement.java:291)
at sun.reflect.GeneratedMethodAccessor7.invoke(Unknow n Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at
org.apache.tools.ant.dispatch.DispatchUtils.execut e(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:39 0)
at org.apache.tools.ant.Target.performTasks(Target.ja va:411)
at
org.apache.tools.ant.Project.executeSortedTargets( Project.java:1399)
at org.apache.tools.ant.Project.executeTarget(Project .java:1368)
at
org.apache.tools.ant.helper.DefaultExecutor.execut eTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Projec t.java:1251)
at org.apache.tools.ant.Main.runBuild(Main.java:809)
at org.apache.tools.ant.Main.startAnt(Main.java:217)
at org.apache.tools.ant.launch.Launcher.run(Launcher. java:280)
at org.apache.tools.ant.launch.Launcher.main(Launcher .java:109)

...except that we have a check at lines 125-127 that just quits if
clazz.getParentClass() is null.

If anyone has time and inclination to take a look for me, I'd appreciate
any tips about what to try next. I can't see why getParentClass() isn't
working on the various EventProducer classes in the source. :(

TIA
Rudi






[1] http://koji.fedoraproject.org/koji/buildinfo?buildID=246382
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Introduction and a request for help
 

2011/6/9 Ruediger Landmann:
> Hi all;
> The problem is in our EventProducerCollector, which is patched to use a
> different version of qdox (1.12) from the one that upstream bundles with
> FOP (1.6). Specifically, clazz.getParentClass() is always null and would
> result in a null pointer exception:
> ...except that we have a check at lines 125-127 that just quits if
> clazz.getParentClass() is null.

It seems that JavaMethod[] JavaClass.getMethods(boolean) call returns some null
values; should check for that also in line 131


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