Ich vermute, dass mein HPUX-Systen gepatcht werden muss.
Richtig. Das steht nämlich auch auf der
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Required Patches:

Some patches are required for JDK and JRE 6.0.x.
First, the Java 5.0 Quality Pack patches must be installed.
Refer to the HP-UX 11i patches required for Java page and follow the Java 5.0 recommendations.
Second, on PA-RISC systems, a linker patch is required to fix a problem loading libjli.sl. The following patches are required:
* HP-UX 11i v1 (11.11) PA-RISC systems: PHSS_35385
* HP-UX 11i v2 (11.23) PA-RISC systems: PHSS_37201
* HP-UX 11i v3 (11.31) PA-RISC systems: PHSS_37202