Getting NullPointerException while opening test scenario in RHPAM

Issue

• Getting exception popup in Business Central UI "Unable to complete your request. The following exception occurred: null." and below exception in logs.

  2020-07-17 10:18:25,659 ERROR [org.guvnor.common.services.backend.exceptions.ExceptionUtilities] (default task-7) Exception thrown: null: org.guvnor.common.services.shared.exceptions.GenericPortableException
      at org.guvnor.common.services.backend.exceptions.ExceptionUtilities.handleException(ExceptionUtilities.java:46)
      at org.kie.workbench.common.services.datamodel.backend.server.DataModelServiceImpl.getDataModel(DataModelServiceImpl.java:74)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:498)
      ...
  Caused by: java.lang.NullPointerException
      at org.kie.scanner.KieModuleMetaDataImpl.getTypeMetaInfo(KieModuleMetaDataImpl.java:126)
      at org.kie.workbench.common.services.backend.builder.core.TypeSourceResolver.isDeclaredInDRL(TypeSourceResolver.java:49)
      at org.kie.workbench.common.services.backend.builder.core.TypeSourceResolver.getTypeSource(TypeSourceResolver.java:35)
      ...
  

• The log file contains:

  2020-07-17 10:05:23,744 WARN  [org.jboss.modules.define] (default task-14) Failed to define class META-INF.versions.9.module-info in Module "deployment.decision-central.war" from Service Module Loader: java.lang.UnsupportedClassVersionError: Failed to link META-INF/versions/9/module-info (Module "deployment.decision-central.war" from Service Module Loader): META-INF/versions/9/module-info has been compiled by a more recent version of the Java Runtime (class file version 53.0), this version of the Java Runtime only recognizes class file versions up to 52.0
  

• Attempt to open any project fails with the pop up message Error retrieving data types in UI;