vmcj/TRACE_2 is a SAP Parameter attribute which is used to control trace flags for java vm at trace level 2 information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
This parameter defines the initial value of the trace flag for the Java VM in trace level 2. The trace flags are composed of three bit masks (normal, extended, JIT). You specify them in the following form: 0x'ffffffff' for the normal and JIT trace flags and 0x'ffffffffffffffff' for the extended bit mask For a list of the possible trace flags, see
See SAP Parameter Documentation for full SAP documentation for this profile parameter.