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Sometimes there's NPE due to DataEditorSupport missing. Problem probably originates in serialization.I'll investigate and fix this.
WSDL preview was disabled for Web Services from Java in 6.5 . Issue's caused by creation of DefaultDataObject instead of WSDLDataObject from WSDL file.
Issue causing creation of DefaultDataobject instead of WSDLDataObject was most probably fixed and this issue is reproducible no more.
v.