vaadin 8 widgetset compilation error - Error constructing Java AST

I try to use jasperReport API, including this jars in maven

net.sf.jasperreports jasperreports ${jasperReport.version} org.olap4j olap4j commons-logging commons-logging xml-apis xml-apis [/color]

when I try to build the application , widgetset compilation generates this error: Error constructing Java AST

maybe is related to a GWT jar conflict

please help me

I rember there was some problems with jasperreports and widgetset compilation due to a transitive dependency of jasperreports to eclipse jtd compiler; you can try to exclude it.