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Date: Fri, 13 Aug 2004 21:07:00 -0000
From: "mckinlay at redhat dot com" <gcc-bugzilla@gcc.gnu.org>
To: java-prs@gcc.gnu.org
Message-ID: <20040813210724.17021.mckinlay@redhat.com>
Reply-To: gcc-bugzilla@gcc.gnu.org
Subject: [Bug libgcj/17021] New: gij: class resolution throws errors too eagerly
X-Bugzilla-Reason: CC
X-SW-Source: 2004-q3/txt/msg00243.txt.bz2
List-Id: <java-prs.sourceware.org>

NoClassDefFoundError should only be thrown if a code path that attempts to use
the missing class is actually used. GIJ, however, throws the error too early.
This can be seen by compiling the following test case and deleting the class
file for "Bar".

$ gcj -C Foo.java Bar.java 
$ rm Bar.class 
$ gij Foo

Exception in thread "main" java.lang.NoClassDefFoundError: while resolving
class: Foo 
   at java.lang.ClassLoader.resolveClass0(java.lang.Class)
(/usr/lib/libgcj.so.4.0.0)
   at java.lang.Class.initializeClass() (/usr/lib/libgcj.so.4.0.0)
   at java.lang.Class.forName(java.lang.String, boolean, java.lang.ClassLoader)
(/usr/lib/libgcj.so.4.0.0)
...

public class Foo
{
  public boolean missing_class_code_path = false;

  public static void main(String[] args)
  {
    new Foo().j();
  }

  void j()
  {
    if (missing_class_code_path)
      new Bar().x();
  }
}

public class Bar 
{
  public void x() {}
}

-- 
           Summary: gij: class resolution throws errors too eagerly
           Product: gcc
           Version: 3.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: libgcj
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: mckinlay at redhat dot com
                CC: gcc-bugs at gcc dot gnu dot org,java-prs at gcc dot gnu
                    dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17021