Solution : https://service.sap.com/sap/support/notes/862674 (SAP Service marketplace login required)
Key words : 
patches -> sap netweaver -> sap netweaver -> sap  netweaver 04 -> entry, customers launch sap netweaver j2ee applications, sap netweaver java applications, java -> sap j2ee engine 6, greatly increased startup time, making interactive debug impractical, vast performance enhancements produced, ibm jdk version lower, terms bad application performance, sap startup framework
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