Problem applying SAP JVM 4.1 patch 20

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Hello experts,

I am running NetWeaver 7.00 portal on SPARC 64bit, Solaris 10 systems. After the initial installation of SAP JVM 4.1.001, I have been able to apply patch 20 (4.1.020) on consumer and producer Sandbox servers. However, I got this error in dev_server0 when restarting the Dev portal server:

Invalid layout of java.lang.ClassLoader at dependencies

The installation seemed to be ok. The JVM version and location were correctly displayed; the dispatcher/SDM servers started ok, but not the application server.

Here is other information:

SBX consumer: NW 7.00 SP26, SAP kernel 720 p201, SAP JVM 4.1.020

SBX producer: NW 7.00 SP23, SAP kernel 700 p278, SAP JVM 4.1.020

Dev consumer: NW 7.00 SP23, SAP kernel 700 p278, SAP JVM 4.1.001

Any suggestions would be greatly appreciated.

Hung