Solution : https://service.sap.com/sap/support/notes/686254 (SAP Service marketplace login required)
Key words :
terms j2ee service hang 100% cpu thread leak reason, <j2ee>/cluster/dispatcher/services/r3startup/work, java threaddump <server_host> <tdump_port><tdump_port>, high cpu usage, high cpu ussage, j2ee engine services, shows cpu time, <j2ee>/configtool add, pressing ctrl+break, service_<element_id>_javaparameters
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