Migrating from a lower to higher version of B*MS 6 product throws java.lang.UnsupportedClassVersionError: JVMCFRE003 bad major version

Issue

• The following Error is thrown while creating a new KieSession after migrating existing code from BRMS/BPMS 6.0.1 to BRMS/BPMS 6.0.2 or any higher version.

java.lang.UnsupportedClassVersionError: JVMCFRE003 bad major version; class=org/jbpm/Process_org$u46$jbpm$u46$Test_Sampling1355201410, offset=6

• Users are facing issue while they are going to fire rules in BRMS/BPMS 6.1, but rules fire successfully in version BRMS/BPMS 6.0.x. What could be the root cause behind this issue?

java.lang.UnsupportedClassVersionError: JVMCFRE003 bad major version;  offset=6