Problem while trying to create a CallGraph with SourceCode

[Akkyen]

I'm unsure what I'm doing wrong here.

public static void main(String[] args)
    {
        Path pathToSource = Paths.get("PathToSourceFolderConstainedPersonalInformation");

        // Create a AnalysisInputLocation, which points to a directory. All class files will be loaded
        // from the directory
        AnalysisInputLocation<JavaSootClass> inputLocation =
                new JavaSourcePathAnalysisInputLocation(pathToSource.toString());

        // Specify the language of the JavaProject. This is especially relevant for Multi-release jars,
        // where classes are loaded depending on the language level of the analysis
        JavaLanguage language = new JavaLanguage(17);

        // Create a new JavaProject and view based on the input location
        JavaProject project = JavaProject.builder((JavaLanguage) language).addInputLocation(inputLocation).build();

        JavaView view = project.createView();

        // Get a MethodSignature
        ClassType classTypeA = project.getIdentifierFactory().getClassType("org.jkiss.dbeaver.ui.app.standalone.ApplicationActionBarAdvisor");
        MethodSignature entryMethodSignature =
                JavaIdentifierFactory.getInstance()
                        .getMethodSignature(classTypeA,
                                "removeUnWantedActions",
                                "void",
                                Collections.emptyList());

        // Create type hierarchy and CHA
        final ViewTypeHierarchy typeHierarchy = new ViewTypeHierarchy(view);
        //System.out.println(typeHierarchy.subclassesOf(classTypeA));
        CallGraphAlgorithm cha = new RapidTypeAnalysisAlgorithm(view, typeHierarchy);
        // Create CG by initializing CHA with entry method(s)
        CallGraph cg = cha.initialize();

        cg.callsFrom(entryMethodSignature).forEach(System.out::println);
    }

I'm getting this exception:

Exception in thread "main" java.lang.NullPointerException: Cannot invoke "com.ibm.wala.ipa.cha.IClassHierarchy.getLoader(com.ibm.wala.types.ClassLoaderReference)" because "this.classHierarchy" is null
	at sootup.java.sourcecode.frontend.WalaJavaClassProvider.iterateWalaClasses(WalaJavaClassProvider.java:270)
	at sootup.java.sourcecode.frontend.WalaJavaClassProvider.getClassSources(WalaJavaClassProvider.java:227)
	at sootup.java.sourcecode.inputlocation.JavaSourcePathAnalysisInputLocation.getClassSources(JavaSourcePathAnalysisInputLocation.java:153)
	at sootup.java.core.views.JavaView.lambda$resolveAll$2(JavaView.java:192)
	at java.base/java.util.stream.ReferencePipeline$7$1.accept(ReferencePipeline.java:273)
	at java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
	at java.base/java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:921)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
	at java.base/java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:682)
	at sootup.java.core.views.JavaView.resolveAll(JavaView.java:194)
	at sootup.java.core.views.JavaView.getClasses(JavaView.java:123)
	at sootup.callgraph.AbstractCallGraphAlgorithm.findMainMethod(AbstractCallGraphAlgorithm.java:390)
	at sootup.callgraph.RapidTypeAnalysisAlgorithm.initialize(RapidTypeAnalysisAlgorithm.java:85)
	at TestSootUp.main(TestSootUp.java:69)

[JonasKlauke]

If you are using the RTA algorithm you need to also put your rt as inputlocation because otherwise it will fail to find java.lang.Object.
This is not the error in this case but if you will fix it that will be next issue :)
Therefore add this to your Javaproject builder considering your java home env variable points to java 8

            .addInputLocation(
                new JavaClassPathAnalysisInputLocation(
                    System.getProperty("java.home") + "/lib/rt.jar"))

mmh it is hard to tell what is the issue because WALA (external dependency) causes it. It might be caused by your given path. it might not point exactly to the jar. It might have problems to find the main method in the given jar. Try to pass your entryMethodSignature to the call graph generation method. CallGraph cg = cha.initialize(Collections.singletonList(entryMethodSignature));

[Akkyen]

Sry for the confusion because I didn't update my project java version but the project I'm trying to analyze is using jdk 17 and since java 9 rt.jar does nolonger exist.