java/7290: Inherited method not found when extending abstract class

jmr@fulcrummicro.com jmr@fulcrummicro.com
Fri Jul 12 13:06:00 GMT 2002


>Number:         7290
>Category:       java
>Synopsis:       Inherited method not found when extending abstract class
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          rejects-legal
>Submitter-Id:   net
>Arrival-Date:   Fri Jul 12 13:06:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Jesse Rosenstock
>Release:        3.2 20020710 (experimental)
>Organization:
>Environment:
System: Linux churchill 2.4.3-12 #1 Fri Jun 8 15:05:56 EDT 2001 i686 unknown
Architecture: i686

	
host: i686-pc-linux-gnu
build: i686-pc-linux-gnu
target: i686-pc-linux-gnu
configured with: ./configure --prefix=/home/user/jmr/app/gcc
>Description:
	If there is an interface I with one method f(), and AX is an
        abstract class implementing I, and AY is marked as extending AX
        (but not marked as implementing I), and AY contains a method
        g() that calls f(), the AY.java will not compile.
>How-To-Repeat:
	Create the files:

        I.java:

        public interface I {
            void f();
        }

        AX.java:

        abstract class AX implements I { }

        AY.java:

        abstract class AY extends AX /*implements I*/ {
            void g() {
                f();
            }
        }

        Then gcj -v AY.java fails as follows:

        Reading specs from /home/user/jmr/app/gcc/lib/gcc-lib/i686-pc-linux-gnu/3.2/specs
        Reading specs from /home/user/jmr/app/gcc/lib/gcc-lib/i686-pc-linux-gnu/3.2/../../../libgcj.spec
        rename spec lib to liborig
        Configured with: ./configure --prefix=/home/user/jmr/app/gcc
        Thread model: single
        gcc version 3.2 20020710 (experimental)
         /home/user/jmr/app/gcc/lib/gcc-lib/i686-pc-linux-gnu/3.2/jc1 AY.java -fno-use-divide-subroutine -fuse-boehm-gc -fnon-call-exceptions -fkeep-inline-functions -quiet -dumpbase AY.java -g1 -version -o /tmp/ccUMp3aH.s
        GNU Java version 3.2 20020710 (experimental) (i686-pc-linux-gnu)
                compiled by GNU C version 2.96 20000731 (Red Hat Linux 7.1 2.96-85).
        Class path starts here:
            /home/user/jmr/gcj_test/interface/
            /home/user/jmr/app/gcc/share/java/libgcj-3.2.jar/ (system) (zip)
        AY.java: In class `AY':
        AY.java: In method `AY.g()':
        AY.java:3: error: No method named `f' in scope.
                   f();
                   ^
        1 error

        It works if AY is also marked as implementing I, so this is a
        workaround.

        This code compiles with javac.
>Fix:
	
>Release-Note:
>Audit-Trail:
>Unformatted:



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