Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/poi/util/POILogFactory

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/poi/util/POILogFactory

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/poi/util/POILogFactory
at org.apache.poi.POIXMLDocumentPart.<clinit>(POIXMLDocumentPart.java:52)
at SimpleDocument.SimpleDocument.main(SimpleDocument.java:23)
Caused by: java.lang.ClassNotFoundException: org.apache.poi.util.POILogFactory
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 2 more

少包