Name: mf23781 Date: 06/10/99


Test Case and Failure Data:
The failure was discovered and the proposed fix tested using IBM
EJB testcases and BEA WebLogic's EJB compiler. No smaller testcase
is available.
Description of Problem:
When generating BEA WebLogic interfaces for an Enterprise Java Bean
using the WebLogic EJB compiler (called ejbc), an access violation
occurs in java.exe.

Problem Analysis:
When the exception occurs, the call stack is:
ImplementsInterface(Hjava_lang_Class * 0x0192b5c0, Hjava_lang_Class
* 0x01926ee0, execenv * 0x100cf1b0) line 1370 + 3 bytes
is_subclass_of(Hjava_lang_Class * 0x0192b5c0, Hjava_lang_Class
* 0x01926ee0, execenv * 0x100cf1b0) line 1343 + 17 bytes
reflect_is_assignable(Hjava_lang_Class * 0x0192b5c0, Hjava_lang_Class
* 0x01926ee0, execenv * 0x100cf1b0) line 305 + 17 bytes
java_lang_Class_isAssignableFrom(Hjava_lang_Class * 0x01926ee0, Hjava_lang_Class
* 0x0192b5c0) line 470 + 19 bytes
This is a problem in reflect_is_assignable() in reflect.c. Sun changed this function in the 118C build
so that array assignment was handled as described in the spec (see
Sun bug 4090364). In doing so, the block of code that ensures 'ccb' (renamed 'fromcb' in the new code)
is resolved appears to have been lost. This code is required for ImplementsInterface() in
interpreter.c to behave correctly (as stated in the comment that accompanied
the code before the change).

(4) Targeted FCS Release: 1.1.9



Documentation of how root cause was found:
Examined the stack trace given above in the debugger and then
compared reflect.c before and after the fix for 4090364 was
implemented.

Alternative Fixes (advantages/disadvntages):
NONE

Results of IBM Testing in application/customer environment:
Suggested fix eliminates the problem.

Regression Test Run Status/Results: Not available
(Review ID: 84194)

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