Solution : https://service.sap.com/sap/support/notes/1234382 (SAP Service marketplace login required)
Key words : 
dirs=/qopensys/qibm/proddata/javavm/jdk14/64bit/jre/lib/ext, html solution configjvm tool - sap note 1262494the java settings, /infocenter/iseries/v5r4/topic/rzatz/51/admin/reftzval, </my_path>-xx properties / -xj9 parameterthe ibm j9 jvm, timezone=europe/berlinto /qibm/userdata/java400/systemdefault, java extension directorythe java extension directory settings, file /qibm/userdata/java400/systemdefault, sap webas java processes embodies 100 threads, initial heap size / maximum heap sizesetting, significant native memory footprint reduction
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