Slim3にてJDOデータ登録でエラー - 悪あがきプログラマー

Slim3にてJDOでデータ登録をしようと思ったがうまくいかず。
下記Exceptionが・・・

ERROR 2009-05-31 19:16:19,921 [btpool0-1] The class "The class "demo.model.StoreData" is not persistable. This means that it either hasnt been enhanced, or that the enhanced version of the file is not in the CLASSPATH (or is hidden by an unenhanced version), or the Meta-Data/annotations for the class are not found." is not persistable. This means that it either hasnt been enhanced, or that the enhanced version of the file is not in the CLASSPATH (or is hidden by an unenhanced version), or the Meta-Data for the class is not found.
org.datanucleus.jdo.exceptions.ClassNotPersistenceCapableException: The class "The class "demo.model.StoreData" is not persistable. This means that it either hasnt been enhanced, or that the enhanced version of the file is not in the CLASSPATH (or is hidden by an unenhanced version), or the Meta-Data/annotations for the class are not found." is not persistable. This means that it either hasnt been enhanced, or that the enhanced version of the file is not in the CLASSPATH (or is hidden by an unenhanced version), or the Meta-Data for the class is not found.
	at org.datanucleus.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException(NucleusJDOHelper.java:305)
	at org.datanucleus.jdo.JDOPersistenceManager.jdoMakePersistent(JDOPersistenceManager.java:673)
	at org.datanucleus.jdo.JDOPersistenceManager.makePersistent(JDOPersistenceManager.java:693)
	at demo.action.TextareaAction.submit(TextareaAction.java:40)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.slim3.commons.util.MethodUtil.invoke(MethodUtil.java:45)
	at org.slim3.struts.action.ActionWrapper.execute(ActionWrapper.java:63)
	at org.slim3.struts.action.S3RequestProcessor.processActionPerform(S3RequestProcessor.java:285)
	at org.slim3.struts.action.S3RequestProcessor.process(S3RequestProcessor.java:134)
	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
	at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
	at org.slim3.struts.web.S3StrutsFilter.doFilter(S3StrutsFilter.java:100)
	at org.slim3.struts.web.S3StrutsFilter.doFilter(S3StrutsFilter.java:72)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)
	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
	at com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:54)
	at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:268)
	at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:126)
	at org.slim3.struts.web.RoutingFilter.doFilter(RoutingFilter.java:102)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
	at org.slim3.struts.web.S3StrutsFilter.doFilter(S3StrutsFilter.java:100)
	at org.slim3.struts.web.S3StrutsFilter.doFilter(S3StrutsFilter.java:72)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
	at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)
	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
	at com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:54)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
	at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:306)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
	at org.mortbay.jetty.Server.handle(Server.java:313)
	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:506)
	at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:844)
	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:644)
	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:396)
	at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:442)
NestedThrowablesStackTrace:
The class "demo.model.StoreData" is not persistable. This means that it either hasnt been enhanced, or that the enhanced version of the file is not in the CLASSPATH (or is hidden by an unenhanced version), or the Meta-Data/annotations for the class are not found.
org.datanucleus.exceptions.ClassNotPersistableException: The class "demo.model.StoreData" is not persistable. This means that it either hasnt been enhanced, or that the enhanced version of the file is not in the CLASSPATH (or is hidden by an unenhanced version), or the Meta-Data/annotations for the class are not found.
	at org.datanucleus.ObjectManagerImpl.assertClassPersistable(ObjectManagerImpl.java:3830)
	at org.datanucleus.ObjectManagerImpl.persistObjectInternal(ObjectManagerImpl.java:1200)
	at org.datanucleus.ObjectManagerImpl.persistObject(ObjectManagerImpl.java:1135)
	at org.datanucleus.jdo.JDOPersistenceManager.jdoMakePersistent(JDOPersistenceManager.java:668)
	at org.datanucleus.jdo.JDOPersistenceManager.makePersistent(JDOPersistenceManager.java:693)
	at demo.action.TextareaAction.submit(TextareaAction.java:40)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at org.slim3.commons.util.MethodUtil.invoke(MethodUtil.java:45)
	at org.slim3.struts.action.ActionWrapper.execute(ActionWrapper.java:63)
	at org.slim3.struts.action.S3RequestProcessor.processActionPerform(S3RequestProcessor.java:285)
	at org.slim3.struts.action.S3RequestProcessor.process(S3RequestProcessor.java:134)
	at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
	at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:713)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:806)
	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1093)
	at org.slim3.struts.web.S3StrutsFilter.doFilter(S3StrutsFilter.java:100)
	at org.slim3.struts.web.S3StrutsFilter.doFilter(S3StrutsFilter.java:72)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)
	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
	at com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:54)
	at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:268)
	at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:126)
	at org.slim3.struts.web.RoutingFilter.doFilter(RoutingFilter.java:102)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
	at org.slim3.struts.web.S3StrutsFilter.doFilter(S3StrutsFilter.java:100)
	at org.slim3.struts.web.S3StrutsFilter.doFilter(S3StrutsFilter.java:72)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
	at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
	at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:712)
	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
	at com.google.apphosting.utils.jetty.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:54)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
	at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:306)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:139)
	at org.mortbay.jetty.Server.handle(Server.java:313)
	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:506)
	at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:844)
	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:644)
	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:381)
	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:396)
	at org.mortbay.thread.BoundedThreadPool$PoolThread.run(BoundedThreadPool.java:442)

いろいろ見てみると、ビルド時にコンソールに下記メッセージが出力されていた。

Encountered a problem: Unexpected exception
Please see the logs [C:\DOCUME~1\ykoh\LOCALS~1\Temp\enhance28244.log] for further information.

上記ファイルの中身。
何やら、エンハンサーでエラーになっている。
エンハンサーってなんだ？

java.lang.RuntimeException: Unexpected exception
	at com.google.appengine.tools.enhancer.Enhancer.execute(Enhancer.java:59)
	at com.google.appengine.tools.enhancer.Enhance.<init>(Enhance.java:60)
	at com.google.appengine.tools.enhancer.Enhance.main(Enhance.java:41)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:585)
	at com.google.appengine.tools.enhancer.Enhancer.execute(Enhancer.java:57)
	... 2 more
Caused by: org.datanucleus.exceptions.NucleusException: Plugin (Bundle) "org.datanucleus.store.appengine" is already registered. Ensure you dont have multiple JAR versions of the same plugin in the classpath. The URL "file:/C:/Documents%20and%20Settings/ykoh/workspace/slim3test/war/WEB-INF/lib/datanucleus-appengine-1.0.0.final.jar" is already registered, and you are trying to register an identical plugin located at URL "file:/C:/Program%20Files/eclipse%20jee/plugins/com.google.appengine.eclipse.sdkbundle_1.2.0.v200904062334/appengine-java-sdk-1.2.0/lib/user/orm/datanucleus-appengine-1.0.0.final.jar."
	at org.datanucleus.plugin.NonManagedPluginRegistry.registerBundle(NonManagedPluginRegistry.java:437)
	at org.datanucleus.plugin.NonManagedPluginRegistry.registerBundle(NonManagedPluginRegistry.java:343)
	at org.datanucleus.plugin.NonManagedPluginRegistry.registerExtensions(NonManagedPluginRegistry.java:227)
	at org.datanucleus.plugin.NonManagedPluginRegistry.registerExtensionPoints(NonManagedPluginRegistry.java:159)
	at org.datanucleus.plugin.PluginManager.registerExtensionPoints(PluginManager.java:82)
	at org.datanucleus.OMFContext.<init>(OMFContext.java:164)
	at org.datanucleus.enhancer.DataNucleusEnhancer.<init>(DataNucleusEnhancer.java:153)
	at org.datanucleus.enhancer.DataNucleusEnhancer.main(DataNucleusEnhancer.java:1138)
	... 7 more

webで調べてると下記にヒントがありました。

resovled the error by -
removing multiple datanucleus-appengine-1.0.0.final.jar file from
classpath and i had my dependent project's multiple jar file.
so by removing this i have resolved the problem.

英語は苦手なんだけど、
「datanucleus-appengine-1.0.0.final.jar」をクラスパスからはずせということか？
と思ってやってみると、できた！

success!!

DataNucleus Enhancer (version 1.1.0) : Enhancement of classes

DataNucleus Enhancer completed with success for 2 classes. Timings : input=312 ms, enhance=125 ms, total=437 ms. Consult the log for full details

なぜ、このjarがあるといけなくて、
ほんとに除去してよかったのかもわからないけど、
とりあえず、動くようになった。

だれか理由がわかる人がいたらご教示願いたいです。

追記：
ここも参考にしました。
ぶいてく: 【Google App Engine】開発で嵌らないためのTIPS