JMX Job is not storing complete signature information in Form view.
Steps to reproduce the issue:
JMX_COMPOSITE_ADD NAME= (give any data more than 30 characters)
JMX_INVOKE= (give any data more than 30 characters and Signature java.lang.String,javax.management.openmbean.CompositeData
Release : 12.X
Component : AUTOMATION ENGINE
Use the double quotes for the signature in JMX process.
Now, when you go to form view in process tab and add an invoke operation. You will be able to view complete signature. Below Screenshot for reference.