Solution : https://service.sap.com/sap/support/notes/1293765 (SAP Service marketplace login required)
Key words : 
avoid sporadic java vm breakdowns, sap jvm patch collection 20 relates, unlink stale object pointers, 1 patch collection 20 solution, java vm start, symptom sap jvm 5, sap jvm build 5, avoid potential deadlocks, dns hostname lookups, string intern table
Related Notes : 
       
| 1367498 | SAP JVM installation prerequisites | 
| 1249462 | How to import an SAP JVM patch into an SAP BC | 
| 1133020 | How to import a SAP JVM patch into an AS Java |