define entry point for JUnit4 and do across files analysis

[xxwxxwen]

When I try to add JUnit4 entrypoint support #669 ,I failed to build call graph for the java class without main method. I'm not sure how to make call graph in a directory across multiple files #648 and analyze the source file(.java) dir of java programs #573.

How can we define our own entry point for JUnit4,and how to do across files analysis?

This is my code:
scope = new JavaSourceAnalysisScope(); scope.addSourceFileToScope(JavaSourceAnalysisScope.SOURCE,new File(path),".java");
scope.addClassFileToScope(ClassLoaderReference.Application,new File(path));
scope.addToScope(ClassLoaderReference.Application,new SourceDirectoryTreeModule(new File(path));
cha = ClassHierarchyFactory.make(scope,new ECJClassLoaderFactory(scope.getExclusions()));

Iterable entryPoints = findMethod1();
AnalysisOptions options = new AnalysisOptions(scope, entryPoints);
//options.setEntrypoints(entryPoints);

And this is the error.
Class Hierarchy construction failed
com.ibm.wala.ipa.cha.ClassHierarchyException: failed to load root <Primordial,Ljava/lang/Object> of class hierarchy
com.ibm.wala.ipa.cha.ClassHierarchyException: failed to load root <Primordial,Ljava/lang/Object> of class hierarchy
at com.ibm.wala.ipa.cha.ClassHierarchy.(ClassHierarchy.java)
at com.ibm.wala.ipa.cha.ClassHierarchy.(ClassHierarchy.java)
atcom.ibm.wala.ipa.cha.ClassHierarchyFactory.make(ClassHierarchyFactory.java)
atcom.ibm.wala.ipa.cha.ClassHierarchyFactory.make(ClassHierarchyFactory.java)
atcom.ibm.wala.cast.java.client.JavaSourceAnalysisEngine.buildClassHierarchy(JavaSourceAnalysisEngine.java)
atcom.ibm.wala.client.AbstractAnalysisEngine.defaultCallGraphBuilder(AbstractAnalysisEngine.java)
atcom.ibm.wala.client.AbstractAnalysisEngine.buildDefaultCallGraph(AbstractAnalysisEngine.java)
java.lang.IllegalArgumentException: cha is null
at com.ibm.wala.ipa.callgraph.impl.Util.makeMainEntrypoints(Util.java)
atcom.ibm.wala.cast.java.client.JavaSourceAnalysisEngine.makeDefaultEntrypoints(JavaSourceAnalysisEngine.java)
atcom.ibm.wala.client.AbstractAnalysisEngine.defaultCallGraphBuilder(AbstractAnalysisEngine.java)
atcom.ibm.wala.client.AbstractAnalysisEngine.buildDefaultCallGraph(AbstractAnalysisEngine.java)