vmcj/debug_proxy/cfg/generate is a SAP Parameter attribute which is used to control Generation of config file of the Java Debug Proxy 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 .
Do you want the configuration file for the Java debug proxy to be
generated dynamically?
See SAP Parameter Documentation for full SAP documentation for this profile parameter.