SA-8840

Summary

Post migration of the IBM JVM from JAVA 6 to JAVA 7, an exception is thrown on sorting column in the detailed view drilled down of a summary view, .

Error Messages

Status fail
Message Comparison method violates its general contract!
Timestamp Fri Apr 10 09:07:46 GMT 2015
Engine Version PegaRULES 6.1 SP2 (coreBuild_060120_0161)

Log Entries
==========
Caused by:
java.lang.IllegalArgumentException: Comparison method violates its general contract!
at java.util.TimSort.mergeLo(TimSort.java:758)
at java.util.TimSort.mergeAt(TimSort.java:494)
at java.util.TimSort.mergeCollapse(TimSort.java:419)
at java.util.TimSort.sort(TimSort.java:225)
at java.util.TimSort.sort(TimSort.java:184)
at java.util.Arrays.sort(Arrays.java:670)
at java.util.Collections.sort(Collections.java:228)
at com.pega.pegarules.data.internal.access.RdbCachedRowSet.sort(RdbCachedRowSet.java:183)
at com.pega.pegarules.data.internal.access.DatabaseRowSet.sort(DatabaseRowSet.java:602)
at com.pega.pegarules.data.internal.access.VirtualPageListImpl.sort(VirtualPageListImpl.java:141)
at com.pega.pegarules.data.internal.clipboard.ClipboardPropertyImpl.sortVirtualPageList(ClipboardPropertyImpl.java:4661)
at com.pega.pegarules.data.internal.clipboard.SorterImpl.sortPageList(SorterImpl.java:160)
at com.pega.pegarules.data.internal.clipboard.SorterImpl$StaticHelper.sortPageList(SorterImpl.java:317)
at com.pega.pegarules.data.external.clipboard.Sorter.sortPageList(Sorter.java:45)
at com.pega.pegarules.session.internal.mgmt.Executable.sortPageList(Executable.java:4761)
at com.pegarules.generated.activity.ra_action_sortddcolumn_ca78a73a20f0810a43dc4b9beed11bb4.step4_circum0(ra_action_sortddcolumn_ca78a73a20f0810a43dc4b9beed11bb4.java:439)
at com.pegarules.generated.activity.ra_action_sortddcolumn_ca78a73a20f0810a43dc4b9beed11bb4.perform(ra_action_sortddcolumn_ca78a73a20f0810a43dc4b9beed11bb4.java:126)
at com.pega.pegarules.session.internal.mgmt.Executable.doActivity(Executable.java:3502)
at com.pega.pegarules.session.internal.mgmt.base.ThreadRunner.runActivitiesAlt(ThreadRunner.java:620)

Steps to Reproduce

1. Create a summary view report (Timelines by operator ). Drilled down to detailed view.
2. Create a portal and provide a link to access the report from reports tab.
3. After accessing the summary view (Timeliness by operator) click on drilled down view.
4. After sorting few of the columns, exception is displayed in the pop-up window.

Deployment Scenario:

• Pega Version: PegaRULES 6.1 SP2 (coreBuild_060120_0161)
•  
• New Evergreening SIT Env with below JAVA version:

Root Cause

The root cause of this problem is defect/misconfiguration in the operating environment. 

The Issue occurs due to upgrade from the JDK version from 1.6 to 1.7 at user's end.

As of Java 7, the default sort algorithm has changed from MergeSort to TimSort. TimSort is apparently more sensitive to the way the compareTo functions are implemented. If inconsistencies in the results are allowed, the following exception can be thrown:

Resolution

The Solution  is to revert you back to the old MergeSort  of JAVA SE 6.

Following JVM property is required:   -Djava.util.Arrays.useLegacyMergeSort=true.  

For more information refer to Platform Support Guide at page 10 : https://pdn.pega.com/documents/platform-support-guide