[Bug]: java.lang.IllegalStateException: Class Information Should not be null

[sahilagichani14]

What happened?

Check #958

Version

Latest develop branch

Relevant log output

Exception in thread "main" java.lang.IllegalStateException: Class Information Should not be null
	at sootup.apk.frontend.dexpler.DexClassSource.resolveSuperclass(DexClassSource.java:114)
	at com.google.common.base.Suppliers$NonSerializableMemoizingSupplier.get(Suppliers.java:181)
	at sootup.core.model.SootClass.getSuperclass(SootClass.java:158)
	at sootup.java.core.JavaSootClass.getSuperclass(JavaSootClass.java:129)
	at java.base/java.util.Optional.flatMap(Optional.java:289)
	at sootup.interceptors.typeresolving.AugEvalFunction.getExceptionPath(AugEvalFunction.java:253)
	at sootup.interceptors.typeresolving.AugEvalFunction.getLeastCommonExceptionType(AugEvalFunction.java:281)
	at sootup.interceptors.typeresolving.AugEvalFunction.evaluate(AugEvalFunction.java:199)
	at sootup.interceptors.typeresolving.TypeResolver.applyAssignmentConstraint(TypeResolver.java:216)
	at sootup.interceptors.typeresolving.TypeResolver.resolve(TypeResolver.java:75)
	at sootup.interceptors.TypeAssigner.interceptBody(TypeAssigner.java:42)
	at sootup.apk.frontend.dexpler.DexMethodSource.resolveBody(DexMethodSource.java:65)
	at sootup.apk.frontend.dexpler.DexMethodSource.makeSootMethod(DexMethodSource.java:76)
	at sootup.apk.frontend.main.DexBody.makeSootMethod(DexBody.java:360)
	at sootup.apk.frontend.dexpler.DexMethod.makeSootMethod(DexMethod.java:55)
	at sootup.apk.frontend.dexpler.DexClassSource.loadMethod(DexClassSource.java:144)
	at sootup.apk.frontend.dexpler.DexClassSource.lambda$resolveMethods$0(DexClassSource.java:69)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
	at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
	at java.base/java.util.Spliterators$IteratorSpliterator.forEachRemaining(Spliterators.java:1939)
	at java.base/java.util.stream.Streams$ConcatSpliterator.forEachRemaining(Streams.java:734)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
	at java.base/java.util.stream.ReduceOps$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.apk.frontend.dexpler.DexClassSource.resolveMethods(DexClassSource.java:70)
	at sootup.core.model.SootClass.lazyMethodInitializer(SootClass.java:78)
	at com.google.common.base.Suppliers$NonSerializableMemoizingSupplier.get(Suppliers.java:181)
	at sootup.core.model.SootClass.getMethods(SootClass.java:95)
	at sootup.java.core.JavaSootClass.getMethods(JavaSootClass.java:68)
	at sootupexport.FactGenerator.generate(FactGenerator.java:28)
	at java.base/java.util.AbstractList$RandomAccessSpliterator.forEachRemaining(AbstractList.java:722)
	at java.base/java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:762)
	at sootupexport.FactGenerator.run(FactGenerator.java:22)
	at sootupexport.Main.main(Main.java:32)

[HanweiLi-cqu]

When I built callgraph for the apk, I also hit this bug.
I did some debugging and I found that sootup finds the dex file from the apk and builds a mapping for it: class sig->dex file.

When sootup goes to parse the code, it will find that some classes are not in the map. And this bug occurs.
sootup currently just finds a target android-x folder under the android platform path, but does not resolve android-x/android.jar. And the missing class file is in the android-x/android.jar. I think that's why the problem arises.