Name: dbT83986 Date: 05/01/99


I accidently stumbled across the following obscure bug using
JDK1.1.7B javac on Win95 and NT. I do not think it requires a high priority fix :-)
But it might be useful to have it logged for anyone that gets into a similar situation.
The annoying thing is that when it happens you get an enormous output
from the javac compiler. This is similar to bug 4026931

Jeroen
=========== start code ==============
package foo;
public class bar extends bar implements foobar {
    
}
=============== end code =============
The above(faulty) code produces as expected:
============= start output ===========
D:\workingdir>javac foo\bar.java
foo\bar.java:2: Cyclic class inheritance.
public class bar extends bar implements foobar {
                         ^
1 error
============= end output =============
but the next code:
=========== start code ==============
package foo;
public class bar extends bar implements bar.foobar {
    
}
=============== end code =============
produces:
============= start output ===========
D:\workingdir>javac foo\bar.java
java.lang.StackOverflowError
        at sun.tools.java.ClassDefinition.getFirstMatch(Compiled Code)
        at sun.tools.java.ClassDefinition.getInnerClass(Compiled Code)
.... (100's of times deleted)
        at sun.tools.java.ClassDefinition.getInnerClass(Compiled Code)
        at sun.tools.java.ClassDefinition.resolveName(Compiled Code)
        at sun.tools.java.ClassDefinition.resolveName(Compiled Code)
        at sun.tools.java.Environment.resolveNames(Compiled Code)
        at sun.tools.javac.SourceField.resolveTypeStructure(Compiled Code)
        at sun.tools.javac.SourceClass.resolveTypeStructure(Compiled Code)
        at sun.tools.javac.SourceClass.basicCheck(Compiled Code)
        at sun.tools.java.ClassDeclaration.getClassDefinition(Compiled Code)
        at sun.tools.java.ClassDefinition.getInnerClass(Compiled Code)
        at sun.tools.java.ClassDefinition.resolveName(Compiled Code)
        at sun.tools.java.ClassDefinition.resolveName(Compiled Code)
        at sun.tools.java.Environment.resolveNames(Compiled Code)
        at sun.tools.javac.SourceField.resolveTypeStructure(Compiled Code)
        at sun.tools.javac.SourceClass.resolveTypeStructure(Compiled Code)
        at sun.tools.javac.SourceClass.basicCheck(Compiled Code)
        at sun.tools.java.ClassDeclaration.getClassDefinition(Compiled Code)
        at sun.tools.java.ClassDefinition.getInnerClass(Compiled Code)
        at sun.tools.java.ClassDefinition.resolveName(Compiled Code)
        at sun.tools.java.ClassDefinition.resolveName(Compiled Code)
        at sun.tools.java.Environment.resolveNames(Compiled Code)
        at sun.tools.javac.SourceField.resolveTypeStructure(Compiled Code)
        at sun.tools.javac.SourceClass.resolveTypeStructure(Compiled Code)
        at sun.tools.javac.SourceClass.basicCheck(Compiled Code)
        at sun.tools.java.ClassDeclaration.getClassDefinition(Compiled Code)
        at sun.tools.javac.Main.compile(Compiled Code)
        at sun.tools.javac.Main.main(Main.java:465)
error: An error has occurred in the compiler; please file a bug report (http://j
ava.sun.com/cgi-bin/bugreport.cgi).
1 error

D:\workingdir>
=============== end output =============
(Review ID: 57723)
======================================================================

Name: krT82822 Date: 06/04/99


The following program contains a cyclic class inheritance error.
This error was detected using the Solaris version of javac 1.1.7.
The Win32 version of javac 1.1.7B and 1.1.8 could not detect the
error--the compiler goes into an infinite loop.

/**
 * Cyclic Inheritance--error found by Solaris version of JDK but not by
 * Win32 version.
 */
public class CyclicInheritance extends CyclicInheritance {
  public static void main(String args[]) {
  }//main

}

Exact text of error messages:
-----------------------------
Win32 version:
javac -classpath classes.zip CyclicInheritance.java
java.lang.StackOverflowError
at sun.tools.java.ClassDefinition.getFirstMatch(Compiled Code)
at sun.tools.java.ClassDefinition.getInnerClass(Compiled Code)
at sun.tools.java.ClassDefinition.getInnerClass(Compiled Code)
at sun.tools.java.ClassDefinition.getInnerClass(Compiled Code)
at sun.tools.java.ClassDefinition.getInnerClass(Compiled Code)
at sun.tools.java.ClassDefinition.getInnerClass(Compiled Code)
at sun.tools.java.ClassDefinition.getInnerClass(Compiled Code)
at sun.tools.java.ClassDefinition.getInnerClass(Compiled Code)
at sun.tools.java.ClassDefinition.getInnerClass(Compiled Code)
           (Above line was repeated indefinitely)

Solaris version:

javac CyclicInheritance.java
CyclicInheritance.java:5: Cyclic class inheritance.
public class CyclicInheritance extends CyclicInheritance {

1 error

Version information
--------------------
Win32(note: the error occurs in both 1.1.7B and 1.1.8)

>java -version
java version "1.1.8"
>java -fullversion
java full version "JDK1.1.8M"

Solaris

>java -version
java version "1.1.7"
>java -fullversion "Solaris_JDK_1.1.7_08"
(Review ID: 83955)
======================================================================