事先使用kettle的工具写好一个转换.xml，然后使用java执行它，完全没问题。但是我把调用代码移到web应用中调用就出错了。求大神解答。
错误：
Caused by: java.lang.NoClassDefFoundError: org/scannotation/AnnotationDB
at org.pentaho.di.core.plugins.BasePluginType.findAnnotatedClassFiles(BasePluginType.java:237)
at org.pentaho.di.core.plugins.BasePluginType.registerPluginJars(BasePluginType.java:500)
at org.pentaho.di.core.plugins.BasePluginType.searchPlugins(BasePluginType.java:115)
at org.pentaho.di.core.plugins.PluginRegistry.init(PluginRegistry.java:420)
at org.pentaho.di.core.KettleEnvironment.init(KettleEnvironment.java:121)
at org.pentaho.di.core.KettleEnvironment.init(KettleEnvironment.java:68)
at com.zj.kettle.KettleRunner.runTransformation(KettleRunner.java:53)
at com.zj.quartz.KettleQuartzJob.execute(KettleQuartzJob.java:31)
at org.quartz.core.JobRunShell.run(JobRunShell.java:202)
... 1 more
Caused by: java.lang.ClassNotFoundException: org.scannotation.AnnotationDB
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1856)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1705)
... 10 more
