[Wala-wala] Excpetion when constructing Call Graph

[Rizkallah T. <riz...@bs...>]

Hi all,

I am using Wala to construct a call graph of the open source project Jena and 
I am getting a null pointer exception. The exception is being thrown because 
calling resolveBinding() returns null in the createClassDeclaration method of 
the JDTJava2CAstTranslator. More precisely at line 472:

for (Object f : fieldDecl.fragments()) {
      VariableDeclarationFragment fieldFrag = (VariableDeclarationFragment) f;
      IVariableBinding fieldBinding = fieldFrag.resolveBinding();
...

I debugged Wala and the piece of code that is causing it to throw this 
exception is the following declaration of the field "log":

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class QueryEngineHTTP implements QueryExecution {
    private static Logger log = 
LoggerFactory.getLogger(QueryEngineHTTP.class);
...

I could not figure out why this field declaration in particular is causing Wala 
not to find the binding and hence to throw a null pointer exception.

Any ideas? Thanks!

Full Stack Trace of Exception:

Exception in thread "main" java.lang.NullPointerException
	at 
com.ibm.wala.cast.java.translator.jdt.JDTJava2CAstTranslator.createClassDeclaration(JDTJava2CAstTranslator.java:476)
	at 
com.ibm.wala.cast.java.translator.jdt.JDTJava2CAstTranslator.visitTypeDecl(JDTJava2CAstTranslator.java:408)
	at 
com.ibm.wala.cast.java.translator.jdt.JDTJava2CAstTranslator.visit(JDTJava2CAstTranslator.java:2837)
	at 
com.ibm.wala.cast.java.translator.jdt.JDTJava2CAstTranslator.translateToCAst(JDTJava2CAstTranslator.java:261)
	at 
com.ibm.wala.cast.java.translator.jdt.ejc.EJCSourceModuleTranslator$EjcAstToIR.acceptAST(EJCSourceModuleTranslator.java:108)
	at 
org.eclipse.jdt.core.dom.CompilationUnitResolver.resolve(CompilationUnitResolver.java:1016)
	at 
org.eclipse.jdt.core.dom.CompilationUnitResolver.resolve(CompilationUnitResolver.java:628)
	at org.eclipse.jdt.core.dom.ASTParser.createASTs(ASTParser.java:982)
	at 
com.ibm.wala.cast.java.translator.jdt.ejc.EJCSourceModuleTranslator.loadAllSources(EJCSourceModuleTranslator.java:197)
	at 
com.ibm.wala.cast.java.loader.JavaSourceLoaderImpl.loadAllSources(JavaSourceLoaderImpl.java:505)
	at 
com.ibm.wala.classLoader.ClassLoaderImpl.init(ClassLoaderImpl.java:529)
	at 
com.ibm.wala.cast.java.loader.JavaSourceLoaderImpl.init(JavaSourceLoaderImpl.java:516)
	at 
com.ibm.wala.cast.java.translator.jdt.JDTClassLoaderFactory.makeNewClassLoader(JDTClassLoaderFactory.java:69)
	at 
com.ibm.wala.classLoader.ClassLoaderFactoryImpl.getLoader(ClassLoaderFactoryImpl.java:69)
	at com.ibm.wala.ipa.cha.ClassHierarchy.<init>(ClassHierarchy.java:231)
	at com.ibm.wala.ipa.cha.ClassHierarchy.<init>(ClassHierarchy.java:177)
	at com.ibm.wala.ipa.cha.ClassHierarchy.make(ClassHierarchy.java:1230)
	at 
com.ibm.wala.cast.java.client.JavaSourceAnalysisEngine.buildClassHierarchy(JavaSourceAnalysisEngine.java:135)
	at 
com.ibm.wala.client.AbstractAnalysisEngine.defaultCallGraphBuilder(AbstractAnalysisEngine.java:304)
	at 
com.ibm.wala.client.AbstractAnalysisEngine.buildDefaultCallGraph(AbstractAnalysisEngine.java:313)
	at 
main.PrefetchingSourceCodeAnalyzer.main(PrefetchingSourceCodeAnalyzer.java:49)

-- 

Sincarely,

Rizkallah Touma

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