The JVM profile DFHJVMCD is reserved for use by CICS-supplied system programs, in particular the default request processor program DFJIIRP (used by the CICS-supplied CIRP request processor transaction) and its CICS-key equivalent DFJIIRQ, to make them independent of any changes you make to the default JVM profile DFHJVMPR. DFHJVMCD has an associated JVM properties file, dfjjvmcd.props. Do not specify this profile in PROGRAM resource definitions that you set up for your own applications.
You need to make sure that DFHJVMCD is set up correctly for your CICS region, but you should customize it only where necessary. Only make the changes to DFHJVMCD and dfjjvmcd.props that are necessary to run applications, or that are required for the correct operation of these JVMs in your system. “Options in JVM profiles” and “System properties for JVMs” in the CICS® System Definition Guide tell you the circumstances in which these changes might be necessary. The comments in the HFS file DFHJVMCD tell you which options can and cannot be changed, and dfjjvmcd.props includes only those system properties which you might need to change. Follow the instructions in Customizing the supplied sample JVM profiles and JVM properties files to make these changes. Do not make any other changes to DFHJVMCD and dfjjvmcd.props.