Description Beat Wieland 2020-03-05 07:40:01 EST

Created attachment 282014 [details]
Sample project to reproduce the bug

Used Eclipse Version: 2019-12 (4.14.0), Build id: 20191212-1212

Extract the appended zip and import the project (File -> Import... -> Existing Projects into Workspace -> select the directory, where you extracted the project to)

Open the class Demo in a code editor tab, then open the type hierarchy (F4) -> A dialog pops up, saying:

An internal error occurred during: "Computing type hierarchy of 'Demo - org.eclipse.bug.f4'...". Index 0 out of bounds for length 0

Open the Error Log (Window -> Show View -> Error Log) and open the event details. Stack Trace:

java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0
	at org.eclipse.jdt.internal.compiler.lookup.ModuleBinding.getOrCreateDeclaredPackage(ModuleBinding.java:339)
	at org.eclipse.jdt.internal.compiler.lookup.ModuleBinding$UnNamedModule.getDeclaredPackage(ModuleBinding.java:105)
	at org.eclipse.jdt.internal.compiler.lookup.ModuleBinding.combineWithPackagesFromOtherRelevantModules(ModuleBinding.java:670)
	at org.eclipse.jdt.internal.compiler.lookup.ModuleBinding.getVisiblePackage(ModuleBinding.java:615)
	at org.eclipse.jdt.internal.compiler.lookup.ModuleBinding.getTopLevelPackage(ModuleBinding.java:552)
	at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.getTopLevelPackage(LookupEnvironment.java:1652)
	at org.eclipse.jdt.internal.compiler.lookup.Scope.getTypeOrPackage(Scope.java:3442)
	at org.eclipse.jdt.internal.compiler.lookup.Scope.getType(Scope.java:3077)
	at org.eclipse.jdt.internal.compiler.ast.SingleTypeReference.getTypeBinding(SingleTypeReference.java:57)
	at org.eclipse.jdt.internal.compiler.ast.TypeReference.internalResolveType(TypeReference.java:528)
	at org.eclipse.jdt.internal.compiler.ast.TypeReference.resolveType(TypeReference.java:629)
	at org.eclipse.jdt.internal.compiler.ast.TypeReference.resolveTypeArgument(TypeReference.java:642)
	at org.eclipse.jdt.internal.compiler.ast.ParameterizedSingleTypeReference.internalResolveLeafType(ParameterizedSingleTypeReference.java:264)
	at org.eclipse.jdt.internal.compiler.ast.ParameterizedSingleTypeReference.internalResolveType(ParameterizedSingleTypeReference.java:174)
	at org.eclipse.jdt.internal.compiler.ast.ParameterizedSingleTypeReference.resolveType(ParameterizedSingleTypeReference.java:390)
	at org.eclipse.jdt.internal.compiler.ast.TypeReference.resolveType(TypeReference.java:625)
	at org.eclipse.jdt.internal.compiler.ast.QualifiedAllocationExpression.resolveTypeForQualifiedAllocationExpression(QualifiedAllocationExpression.java:373)
	at org.eclipse.jdt.internal.compiler.ast.QualifiedAllocationExpression.resolveType(QualifiedAllocationExpression.java:303)
	at org.eclipse.jdt.internal.compiler.ast.Expression.resolve(Expression.java:1066)
	at org.eclipse.jdt.internal.compiler.ast.AbstractMethodDeclaration.resolveStatements(AbstractMethodDeclaration.java:641)
	at org.eclipse.jdt.internal.compiler.ast.MethodDeclaration.resolveStatements(MethodDeclaration.java:316)
	at org.eclipse.jdt.internal.compiler.ast.AbstractMethodDeclaration.resolve(AbstractMethodDeclaration.java:551)
	at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.resolve(TypeDeclaration.java:1293)
	at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.resolve(TypeDeclaration.java:1418)
	at org.eclipse.jdt.internal.compiler.ast.CompilationUnitDeclaration.resolve(CompilationUnitDeclaration.java:666)

My Session Data is:

eclipse.buildId=4.14.0.I20191210-0610
java.version=11.0.2
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_GB
Framework arguments:  -product org.eclipse.epp.package.java.product
Command-line arguments:  -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.java.product


This problem does not occur, if one of following changes are made:
- type inference isn't used: Change line 5 in class Demo to: GenericClass<String> anonymousClassInstance = new GenericClass<String>() {};
- the value of the attribute test in .classpath is changed to false (line 11) (Refresh the project in Eclipse after modifying the file.) It doesn't matter which library is used: As long as there is one classpathentry with attribute test set to true, the problem occurs.
- the file src/main/java/module-info.java is removed