I am using birt 4.3.1 so by default spudsoft emitter is available in birt ,using that emitter i am generating xlsx document but below exception is raised, i am using birt 4.3.1 runtime jar .the problem mentioned in the below path also but i am not understand that one https://bugs.eclipse.org/bugs/show_bug.cgi?id=398774
org.eclipse.birt.report.engine.api.EngineException: Report engine fails to
initialize uk.co.spudsoft.birt.emitters.excel.XlsxEmitter emitter, please
make sure required libraries for this emitter are installed.
Caused by: java.lang.NoClassDefFoundError:org/apache/poi/ss/usermodel/Workbook
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:195)