My Oracle Support Banner

jacob/com/ComFailException.class HTTP/1.1 and HTTP 404 (File not Found) with Jacob.jar (Doc ID 1283729.1)

Last updated on OCTOBER 06, 2023

Applies to:

Oracle Forms - Version and later
Oracle Forms for OCI - Version and later
Information in this document applies to any platform.
Occurs with forms 11g



This problem has been reported infrequently and has been difficult to consistently reproduce internally at Oracle.

1. The problem normally happens with the jacob.jar file but has been reported with other custom jar files.  Symptoms are:

a. Java Console shows ->

network: Connecting http://machine.domain:port/forms/java/com/jacob/com/ComFailException.class with proxy=DIRECT
Exception in thread "thread applet-oracle.forms.engine.Main-2" java.lang.NoClassDefFoundError: com/jacob/com/ComFailException
at java.lang.Class.forName0(Native Method)

Forms Applet version is
Exception in thread "thread applet-oracle.forms.engine.Main-1" java.lang.NoClassDefFoundError: com/jacob/com/ComFailException

b.  The OHS access.log shows ->

NNN.NNN.NNN.NN - - [10/Jan/2011:09:31:52 -0500] "GET /forms/java/jacob.jar HTTP/1.1" 200 60849
NNN.NNN.NNN.NN - - [10/Jan/2011:09:31:52 -0500] "GET /forms/java/com/jacob/com/ComFailException.class HTTP/1.1" 404 1214

2.  Trying to access the jar file directly using the OHS or WLS_FORMS port results in "Page not Found".


Note:  jacob.jar has been signed and is located in the ORACLE_HOME/forms/java directory.

3.  Other jar files such as frmall.jar, frmwebutil.jar, etc., do NOT exhibit this problem.




To view full details, sign in with your My Oracle Support account.

Don't have a My Oracle Support account? Click to get started!

In this Document

My Oracle Support provides customers with access to over a million knowledge articles and a vibrant support community of peers and Oracle experts.