引用《Ubuntu Java Word 转 Pdf》中的代码报ClassNotF?报错

@272764732 你好，想跟你请教个问题：我使用了你的代码测试时报错：
Exception in thread "main" java.lang.NoClassDefFoundError: org/openxmlformats/schemas/wordprocessingml/x2006/main/FontsDocument$Factory
at org.apache.poi.xwpf.converter.core.styles.XWPFStylesDocument.getFontsDocument(XWPFStylesDocument.java:1488)
at org.apache.poi.xwpf.converter.core.styles.XWPFStylesDocument.<init>(XWPFStylesDocument.java:192)
at org.apache.poi.xwpf.converter.core.styles.XWPFStylesDocument.<init>(XWPFStylesDocument.java:186)
at org.apache.poi.xwpf.converter.core.XWPFDocumentVisitor.createStylesDocument(XWPFDocumentVisitor.java:161)
at org.apache.poi.xwpf.converter.core.XWPFDocumentVisitor.<init>(XWPFDocumentVisitor.java:154)
at org.apache.poi.xwpf.converter.pdf.internal.PdfMapper.<init>(PdfMapper.java:149)
at org.apache.poi.xwpf.converter.pdf.PdfConverter.doConvert(PdfConverter.java:54)
at org.apache.poi.xwpf.converter.pdf.PdfConverter.doConvert(PdfConverter.java:37)
at org.apache.poi.xwpf.converter.core.AbstractXWPFConverter.convert(AbstractXWPFConverter.java:45)
at util.poi.WordPdfUtils.wordConverterToPdf(WordPdfUtils.java:78)
at util.poi.WordPdfUtils.main(WordPdfUtils.java:43)
Caused by: java.lang.ClassNotFoundException: org.openxmlformats.schemas.wordprocessingml.x2006.main.FontsDocument$Factory
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
... 11 more