Bug: Exception in thread "main" java.lang.NullPointerException: Cannot read field "compoundName" because "memberType.binding" is null

[djaekim]

Exception in thread "main" java.lang.NullPointerException: Cannot read field "compoundName" because "memberType.binding" is null
	at spoon.support.compiler.jdt.JDTTreeBuilderQuery.searchTypeBinding(JDTTreeBuilderQuery.java:84)
	at spoon.support.compiler.jdt.ReferenceBuilder.getQualifiedTypeReference(ReferenceBuilder.java:285)
	at spoon.support.compiler.jdt.JDTTreeBuilderHelper.createTypeAccess(JDTTreeBuilderHelper.java:445)
	at spoon.support.compiler.jdt.JDTTreeBuilderHelper.createTargetFieldAccess(JDTTreeBuilderHelper.java:663)
	at spoon.support.compiler.jdt.JDTTreeBuilderHelper.createVariableAccess(JDTTreeBuilderHelper.java:267)
	at spoon.support.compiler.jdt.JDTTreeBuilder.visit(JDTTreeBuilder.java:1473)
	at org.eclipse.jdt.internal.compiler.ast.QualifiedNameReference.traverse(QualifiedNameReference.java:1170)
	at org.eclipse.jdt.internal.compiler.ast.MessageSend.traverse(MessageSend.java:1170)
	at org.eclipse.jdt.internal.compiler.ast.MethodDeclaration.traverse(MethodDeclaration.java:411)
	at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.traverse(TypeDeclaration.java:1689)
	at org.eclipse.jdt.internal.compiler.ast.CompilationUnitDeclaration.traverse(CompilationUnitDeclaration.java:822)
	at org.eclipse.jdt.internal.compiler.ast.CompilationUnitDeclaration.traverse(CompilationUnitDeclaration.java:783)
	at spoon.support.compiler.jdt.JDTBasedSpoonCompiler.traverseUnitDeclaration(JDTBasedSpoonCompiler.java:480)
	at spoon.support.compiler.jdt.JDTBasedSpoonCompiler.lambda$buildModel$0(JDTBasedSpoonCompiler.java:437)
	at spoon.support.compiler.jdt.JDTBasedSpoonCompiler.forEachCompilationUnit(JDTBasedSpoonCompiler.java:464)
	at spoon.support.compiler.jdt.JDTBasedSpoonCompiler.buildModel(JDTBasedSpoonCompiler.java:435)
	at spoon.support.compiler.jdt.JDTBasedSpoonCompiler.buildUnitsAndModel(JDTBasedSpoonCompiler.java:372)
	at spoon.support.compiler.jdt.JDTBasedSpoonCompiler.buildSources(JDTBasedSpoonCompiler.java:335)
	at spoon.support.compiler.jdt.JDTBasedSpoonCompiler.build(JDTBasedSpoonCompiler.java:116)
	at spoon.support.compiler.jdt.JDTBasedSpoonCompiler.build(JDTBasedSpoonCompiler.java:99)
	at spoon.Launcher.buildModel(Launcher.java:772)
	at main.app.main(app.java:628)

I run into this exception at launcher_test.buildModel();

[slarse]

Thanks for the bug report!

Could you share the project you're trying to build a model for?

[djaekim]

Thanks for the bug report!

Could you share the project you're trying to build a model for?

I encountered this exception in:

• Flink@21c44688e9
• androidx@b5ae05804ed
• bazel@024deb5826
• quarkus@997d827693
• springboot@ae24d66af7
• vespa@f77660fde6

[slarse]

Cool, thanks, problem is reproducible for me. I'm pretty sure this is a duplicate of #3572.

I also think that this is related to ignoring duplicate declarations, because when doing so, it's possible for type bindings to be null. The fix for this bug is trivial, what's going to be tricky is to create a minimal test case.

[slarse]

Determined that this is caused by the type binding of a nested type being null when a type binding must be searched for. The whole searching for type bindings is explained in some detail in #3709