FULL PRODUCT VERSION :
java version "1.5.0_04"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_04-b05)
Java HotSpot(TM) Client VM (build 1.5.0_04-b05, mixed mode, sharing)


ADDITIONAL OS VERSION INFORMATION :
Windows XP

A DESCRIPTION OF THE PROBLEM :
The following simple code causes a
java.lang.NullPointerException at Check.checkCompatibleConcretes:

class A<T> {}

class B<S> extends A< C<Object> > {}

class C<S> extends B<S> {}

// Note: The bug may be related to the bug with internal review ID: 478380


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Just try to compile the following code:

class A<T> {}

class B<S> extends A< C<Object> > {}

class C<S> extends B<S> {}


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Successful compilation
ACTUAL -
java.lang.NullPointerException at Check.checkCompatibleConcretes

ERROR MESSAGES/STACK TRACES THAT OCCUR :
An exception has occurred in the compiler (1.5.0_04). Please file a bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport) after checking the Bug Parade for duplicates. Include your program and the following diagnostic in your report. Thank you.
java.lang.NullPointerException
        at com.sun.tools.javac.comp.Check.checkCompatibleConcretes(Check.java:1141)
        at com.sun.tools.javac.comp.Check.checkCompatibleSupertypes(Check.java:1495)
        at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:2451)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:2406)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:2355)
        at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:444)
        at com.sun.tools.javac.main.Main.compile(Main.java:592)
        at com.sun.tools.javac.main.Main.compile(Main.java:544)
        at com.sun.tools.javac.Main.compile(Main.java:67)
        at com.sun.tools.javac.Main.main(Main.java:52)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
class A<T> {}

class B<S> extends A< C<Object> > {}

class C<S> extends B<S> {}

---------- END SOURCE ----------
###@###.### 2005-06-30 09:26:06 GMT