rdisp/max_jvm is a SAP Parameter attribute which is used to control Configure maximal number of Java VMs 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 .
With this parameter the minimum number of pooled Java VMs can be
configured in the VMC (Virtual Machine Container). This number is s
pecified for each VM type. If DEFAULT is specified instead of a value,
the system calculates the value internally.
Caution:
The VMC does not currently contain a servlet container. Therefore no
SERVLET VMs are started.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.