Process Automation: Upgraded to JDK 8. Showing a blank page when accessed. ERROR: "Unable to compile class for JSP" in c2o.log
Article ID: 4125
Updated On:
Products
Issue/Introduction
Problem:
Recent upgrade of Process Automation JDK from a 1.7 to a 1.8 release, or an incremental update to a 1.8.0_81 or later JDK. Afterwards the Process Automation login page shows as blank page and in the \pam\server\c2o\c2o.log we see the following unable to compile class error message:
2016-10-05 08:52:55,663 ERROR [org.apache.jasper.compiler.Compiler] [8.20.197-8080-9] Compilation error
org.eclipse.jdt.internal.compiler.classfmt.ClassFormatException
2016-10-05 08:52:55,788 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[EXAMPLE-PAM-SERVER].[/itpam].[jsp]] [8.20.197-8080-9] Servlet.service() for servlet jsp threw exception
org.apache.jasper.JasperException: Unable to compile class for JSP:
This issue impacts ALL version of 4.2 (where there is no support for JDK 8 at all); and version 4.3 and 4.3 sp1.
Please note - This also applies to the non-public JDK 7 releases; versions 1.7.0_81 or later.
Environment
Component:
Cause
Answer:
This is caused by a security change Oracle made starting with JDK version 1.8.0_91. You can confirm the JDK version used by Process Automation by opening the c2osvcw.conf file for windows which is located here:
/PAM/server/c2o/bin
Lines 5 and 8 show the path and version of the JDK in use:
wrapper.java.command=d:/program files/java/jdk1.8.0_101/bin/java
wrapper.java.classpath.2=d:/program files/java/jdk1.8.0_101/lib/tools.jar
Resolution
The log term solution is to upgrade to the latest release of Process Automation Orchestrator 4.3 SP2 where we have resolve these issues and fully support JDK 8 and the unreleased JDK 7 patches.
As a temporary work around until the Orchestrator engine can be upgraded, please revert the JDK to earlier release. For 4.3 and 4.3 sp1 please revert to JDK 1.8.0_90 or earlier, for all 4.2.x releases please revert to JDK 1.7.0_79 or earlier.
1. Stop the CA Process Automation Orchestrator service
2. Uninstall the 1.8.0_x (fully uninstall of the JDK from the system using normal uninstall options for your OS).
3. Install older JDK.
For 4.3 and 4.3 sp1: JDK 1.8.0_90 or earlier,
For all 4.2.x releases: JDK 1.7.0_79 or earlier.
4. Modify \pam\server\c2o\bin\c2osvcw.conf
update lines 5 and 8 with the path to the newly installed JDK.
5. Delete the following cache folders from \PAM\server\c2o
data
logs
scripts
tmp
temp
work
wrappers
6. Start the orchestrator service
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