Part stylesPart = new org.docx4j.openpackaging.parts.WordprocessingML.StyleDefinitionsPart(); try { ((org.docx4j.openpackaging.parts.WordprocessingML.StyleDefinitionsPart) stylesPart) .unmarshalDefaultStyles(); // Add the styles part to the main document part relationships // (creating it if necessary) wordDocumentPart.addTargetPart(stylesPart); :