[Soot-list] NullPointerException in retrieveActiveBody

[Nitin Goel]

Hi Eric,

Thanks for your quick reply. However I am not sure whether this is related 
to class loading or not as when I remove the try catch block from my program 
Test123, it is working fine. Do you think that there can be an issue in 
class loading when I use try catch block in my class?

I am directly using the Soot API instead of using soot command line tool.

Thanks & Regards,
Nitin Goel


>From: "Eric Bodden" <eric.bodden at mail.mcgill.ca>
>To: "Nitin Goel" <ernitingoel at hotmail.com>
>CC: <soot-list at sable.mcgill.ca>
>Subject: RE: [Soot-list] NullPointerException in retrieveActiveBody Date: 
>Tue, 30 Jan 2007 11:43:24 -0500
>
>I would assume that this is a classloader problem. What's you soot
>command line?
>
>
>
>Eric
>
> > -----Original Message-----
> > From: soot-list-bounces at sable.mcgill.ca
> > [mailto:soot-list-bounces at sable.mcgill.ca] On Behalf Of Nitin Goel
> > Sent: Monday, January 29, 2007 12:40 PM
> > To: soot-list at sable.mcgill.ca
> > Subject: [Soot-list] NullPointerException in retrieveActiveBody
> >
> > Hi,
> >
> > I am new to Soot. When I am trying to generate jimple for my
> > class Test123 using the method
> > SootMethod.retrieveActiveBody(), I am getting the following exception
> >
> > java.lang.NullPointerException
> > at soot.AnySubType.v(AnySubType.java:44)
> > at
> > soot.toolkits.exceptions.ThrowableSet$Manager.<init>(Throwable
> > Set.java:239)
> > at
> > soot.Singletons.soot_toolkits_exceptions_ThrowableSet_Manager(
> > Singletons.java:765)
> > at
> > soot.toolkits.exceptions.ThrowableSet$Manager.v(ThrowableSet.java:274)
> > at
> > soot.toolkits.exceptions.PedanticThrowAnalysis.mightThrow(Peda
> > nticThrowAnalysis.java:68)
> > at
> > soot.toolkits.graph.ExceptionalUnitGraph.buildExceptionDests(E
> > xceptionalUnitGraph.java:342)
> > at
> > soot.toolkits.graph.ExceptionalUnitGraph.initialize(Exceptiona
> > lUnitGraph.java:262)
> > at
> > soot.toolkits.graph.ExceptionalUnitGraph.<init>(ExceptionalUni
> > tGraph.java:148)
> > at
> > soot.toolkits.graph.ExceptionalUnitGraph.<init>(ExceptionalUni
> > tGraph.java:180)
> > at
> > soot.toolkits.scalar.LocalSplitter.internalTransform(LocalSpli
> > tter.java:78)
> > at soot.BodyTransformer.transform(BodyTransformer.java:51)
> > at soot.Transform.apply(Transform.java:104)
> > at soot.JimpleBodyPack.applyPhaseOptions(JimpleBodyPack.java:61)
> > at soot.JimpleBodyPack.internalApply(JimpleBodyPack.java:93)
> > at soot.Pack.apply(Pack.java:120)
> > at soot.coffi.CoffiMethodSource.getBody(CoffiMethodSource.java:115)
> > at soot.SootMethod.getBodyFromMethodSource(SootMethod.java:81)
> > at soot.SootMethod.retrieveActiveBody(SootMethod.java:320)
> > at MyTest.traverseMethods(MyTest.java:60)
> > at MyTest.traverseClasses(MyTest.java:43)
> > at MyTest.main(MyTest.java:32)
> >
> >
> > Where MyTest is my custom class which calls Soot API.
> >
> > Test123.java:
> >
> > public class Test123 {
> >    public Test123() {
> >    }
> >
> >    public static void main(String[] args) {
> >        try {
> >            System.out.println("test program");
> >        } catch (Exception e) {
> >            e.printStackTrace();
> >        }
> >    }
> > }
> > I have tried to debug that using the Soot source code and
> > find out that if I comment out the following lines
> >
> > Line: 239
> > resolveClassErrorSet.add(AnySubType.v(Scene.v().getRefType("ja
> > va.lang.ClassFormatError")));
> >
> > and
> >
> > Line: 263
> > initializationErrorSet.add(AnySubType.v(Scene.v().getRefType("
> > java.lang.Error")));
> >
> > from the Manager( Singletons.Global g ) method of
> > soot.toolkits.exceptions.ThrowableSet class, it is working fine.
> >
> > If I also remove the try-catch block from Test123 class then
> > also it is working fine.
> >
> > It is also working fine with old version of Soot 2.1, however
> > with version 2.2.3, it is not working when I am using try-catch block.
> >
> > I am not really sure whether I am doing anything wrong or
> > it's the problem with Soot. Could you please help me out to
> > figure out the root cause and workaround for this?
> >
> > Thanks & Regards,
> > Nitin Goel
> >
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>

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