Solution : https://service.sap.com/sap/support/notes/1259465 (SAP Service marketplace login required)
Key words :
dvebmgs<instance>/j2ee/cluster/<java node>/core, request=exclusive+prepwalk+compactthe j2ee cluster, chuser fsize=-1 data=-1 core=-1 <sid>adm 2, /developerworks/java/jdk/tools/mat, <java_home>/jre/bin directory, zip package named core, /usr/sap/<sid>/jc, java heap size, ibm developerworks website, high memory consumption
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