Description anuhertsa 2005-01-11 08:37:53 EST

Every now and then subclasses of generic classes will suddenly get a syntax
error in Eclipse with a message like 'Bound mismatch: The type X is not a valid
substitute for the bounded parameter <T extends Y> of the type Z<T>'; where X is
a subclass of Y and Z has nothing to do with it.
The error seems to come up at random and disappears when I clean and rebuild
my project.	
In the logfile I find the following NPE:

java.lang.NullPointerException encountered while running Java Builder.
!STACK 0
java.lang.NullPointerException
	at
org.eclipse.jdt.internal.compiler.lookup.TypeVariableBinding.boundCheck(TypeVariableBinding.java:72)
	at
org.eclipse.jdt.internal.compiler.lookup.ParameterizedTypeBinding.resolve(ParameterizedTypeBinding.java:574)
	at
org.eclipse.jdt.internal.compiler.lookup.BinaryTypeBinding.resolveType(BinaryTypeBinding.java:53)
	at
org.eclipse.jdt.internal.compiler.lookup.BinaryTypeBinding.superclass(BinaryTypeBinding.java:775)
	at
org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding.isSuperclassOf(ReferenceBinding.java:684)
	at
org.eclipse.jdt.internal.compiler.lookup.ReferenceBinding.isCompatibleWith(ReferenceBinding.java:615)
	at
org.eclipse.jdt.internal.compiler.lookup.TypeVariableBinding.boundCheck(TypeVariableBinding.java:72)
	at
org.eclipse.jdt.internal.compiler.ast.ParameterizedSingleTypeReference.checkBounds(ParameterizedSingleTypeReference.java:41)
	at
org.eclipse.jdt.internal.compiler.lookup.ClassScope.checkParameterizedTypeBounds(ClassScope.java:679)
	at
org.eclipse.jdt.internal.compiler.lookup.ClassScope.connectTypeHierarchy(ClassScope.java:869)
	at
org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.connectTypeHierarchy(CompilationUnitScope.java:243)
	at
org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.completeTypeBindings(LookupEnvironment.java:195)
	at org.eclipse.jdt.internal.compiler.Compiler.beginToCompile(Compiler.java:307)
	at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:321)
	at
org.eclipse.jdt.internal.core.builder.AbstractImageBuilder.compile(AbstractImageBuilder.java:215)
	at
org.eclipse.jdt.internal.core.builder.AbstractImageBuilder.compile(AbstractImageBuilder.java:165)
	at
org.eclipse.jdt.internal.core.builder.IncrementalImageBuilder.build(IncrementalImageBuilder.java:113)
	at
org.eclipse.jdt.internal.core.builder.JavaBuilder.buildDeltas(JavaBuilder.java:223)
	at org.eclipse.jdt.internal.core.builder.JavaBuilder.build(JavaBuilder.java:151)
	at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:574)
	at
org.eclipse.core.internal.runtime.InternalPlatform.run(InternalPlatform.java:1044)
	at org.eclipse.core.runtime.Platform.run(Platform.java:747)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:158)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:192)
	at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:221)
	at
org.eclipse.core.internal.runtime.InternalPlatform.run(InternalPlatform.java:1044)
	at org.eclipse.core.runtime.Platform.run(Platform.java:747)
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:224)
	at
org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:243)
	at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:272)
	at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:142)
	at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:203)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:66)