inspectIT agent 1.6.8.8.2 fatal error on Jboss43cp09 jdk 1.5.0_22

Hi to everyone,

We are trying to install inspectIT agent to collect metrics from a JBoss 43CP09 (running with JDK 1.5.0_22).
As we read on manuals, this agent version should be compatible with JDK version from 1.5 and above.
At the beginning, the normal jar (inspectit.installer-all.linux.x64-1.6.8.82.jar) downloaded from repository gave us this error:

Invalid or corrupted file (we are sure about md5 checksum)

After uncompressed and recompiled a new jar, the "invalid" error desappeared, and we put the jar in run.conf, with the following script:

and started.

In STDout log , during the start process, we can see this error

and, after this, the JVM crash down.