3189760 - Cache update in SAP PO fails

• An attempt to do a Delta cache refresh in a Process Orchestration system fails with some of the errors below visible in different locations in the system
  The error is: org.xml.sax.SAXException: JavaErrors Tag found in cache update XML.
  at com.sap.aii.af.service.cpa.impl.cache.directory.DirectoryDataSAXHandler.startElement
• You may also find an error in the Cache Connectivity Test similar to:
  com.sap.aii.af.service.cpa.impl.cache.directory.helper.DirectoryHttpClient.setupAndSend(DirectoryHttpClient.java:86)
  at com.sap.aii.af.service.cpa.impl.cache.directory.helper.DirectoryHttpClient.send(DirectoryHttpClient.java:21)
  at com.sap.aii.af.service.cpa.impl.cache.directory.DirectoryAccess.getDataFromDirectory(DirectoryAccess.java:302) ... 7 more
  [Fetch Local]: Thrown: com.sap.aii.ib.core.abapcache.CacheRefreshException: [133]: transaction rolled back by detected deadlock: TrexUpdate failed on table '<DB Schema>:XI_DIRCACHEEVENT' with error: transaction rolled back by detected deadlock: Deadlock detected: owner tid cycle=[(victim) 9068569723, 9061587963], rc=4616 OpenSQLExceptionCategories: [TRANSIENT, TRANSACTION_ROLLBACK]
  at com.sap.aii.ib.server.abapcache.sql.SQLHandler.cast_ResourceException(SQLHandler.java:716
  at com.sap.aii.ibdir.server.abapcache.sql.CacheEventSQL.update_Refresh_Work(CacheEventSQL.java:598)
  at com.sap.aii.ibdir.server.abapcache.CacheRefreshRequest.processHTTPRequest(CacheRefreshRequest.java:282)
  at com.sap.aii.ibdir.server.abapcache.CacheRefreshRequest.handleHTTPRequest(CacheRefreshRequest.java:137)
  at com.sap.aii.ibdir.server.abapcache.HmiMethod_CacheRefresh.process(HmiMethod_CacheRefresh.java:42)...
• The update appears to timeout well before the various timeout parameters which would impact the cache update e.g. PROCTIMEOUT, directoryConnectionReadTimeout, acquireLockTimeout etc
• A Web Dispatcher or Load Balancer tool is configured in the system and the cache update is going via this (if you bypass the Web Dispatcher the update is successful)

• SAP NetWeaver 7.5
• SAP Web Dispatcher

Process Integration, Process Orchestration 7.4, PI 7.4, PO 7.4, Process Orchestration 7.5, PI 7.5, PO 7.5, XI, AEX, CPA cache , KBA , BC-XI-CON-AFW-DC , Directory Cache , BC-CST-WDP , Web Dispatcher , Problem