java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory

在applet中显示，slf4j-api-1.63.jar,slf4j-log4j12-1.63.jar包含这两个包为什么还是出现
Exception in thread "thread applet-com.lucenePrefuse.applet.GraphShow.class-1" java.lang.NoClassDefFoundError: org/slf4j/LoggerFactory
at com.hp.hpl.jena.util.Metadata.<clinit>(Metadata.java:26)
at com.hp.hpl.jena.JenaRuntime.<clinit>(JenaRuntime.java:25)
at com.hp.hpl.jena.rdf.model.impl.RDFReaderFImpl.<clinit>(RDFReaderFImpl.java:85)
at com.hp.hpl.jena.rdf.model.impl.ModelCom.<clinit>(ModelCom.java:42)
at com.hp.hpl.jena.rdf.model.ModelFactory.createDefaultModel(ModelFactory.java:122)
at com.hp.hpl.jena.rdf.model.ModelFactory.createDefaultModel(ModelFactory.java:116)
at com.hp.hpl.jena.vocabulary.OWL.<clinit>(OWL.java:37)
at com.hp.hpl.jena.ontology.ProfileRegistry.<clinit>(ProfileRegistry.java:48)
at com.hp.hpl.jena.ontology.OntModelSpec.<clinit>(OntModelSpec.java:54)
at com.lucenePrefuse.applet.GetGraph.getG(GetGraph.java:20)
at com.lucenePrefuse.applet.GraphView.demo(GraphView.java:239)
at com.lucenePrefuse.applet.GraphShow.init(GraphShow.java:14)
at sun.plugin2.applet.Plugin2Manager$AppletExecutionRunnable.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: org.slf4j.LoggerFactory
at sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
... 14 more