DocPropsCorePart core = new DocPropsCorePart(); org.docx4j.docProps.core.ObjectFactory coreFactory = new org.docx4j.docProps.core.ObjectFactory(); core.setJaxbElement(coreFactory.createCoreProperties() ); wmlPack.addTargetPart(core); DocPropsExtendedPart app = new DocPropsExtendedPart(); org.docx4j.docProps.extended.ObjectFactory extFactory = new org.docx4j.docProps.extended.ObjectFactory(); app.setJaxbElement(extFactory.createProperties() ); wmlPack.addTargetPart(app);