I have an object defined Serializable as follows: public class comment implements Serializable { /** * */ private static final long serialVersionUID = 1L; private String commentText; private String commenterFedID;
public comment (){ this.commentText = ""; this.commenterFedID = ""; } public comment (String commentText, String commenterFedID){ this.commentText = commentText; this.commenterFedID = commenterFedID; } public String getCommentText() { return commentText; } public String getCommenterFedID() { return commenterFedID; } } I am using this serialized object in a Data Class as follows: @Persistent private ArrayList<comment> comments = new ArrayList<comment>(); But it generates the following exception: java.lang.IllegalArgumentException: comments: testapp.comment is not a supported property type. at com.google.appengine.api.datastore.DataTypeUtils.checkSupportedSingleValue(DataTypeUtils.java: 184) at com.google.appengine.api.datastore.DataTypeUtils.checkSupportedValue(DataTypeUtils.java: 149) at com.google.appengine.api.datastore.DataTypeUtils.checkSupportedValue(DataTypeUtils.java: 123) at com.google.appengine.api.datastore.Entity.setProperty(Entity.java: 280) at org.datanucleus.store.appengine.DatastoreFieldManager.storeObjectField(DatastoreFieldManager.java: 843) at org.datanucleus.state.AbstractStateManager.providedObjectField(AbstractStateManager.java: 1037) at testapp.idea.jdoProvideField(idea.java) at testapp.idea.jdoProvideFields(idea.java) at org.datanucleus.state.JDOStateManagerImpl.provideFields(JDOStateManagerImpl.java: 2715) at org.datanucleus.store.appengine.DatastorePersistenceHandler.updateObject(DatastorePersistenceHandler.java: 534) at org.datanucleus.state.JDOStateManagerImpl.flush(JDOStateManagerImpl.java: 4576) at org.datanucleus.ObjectManagerImpl.flushInternal(ObjectManagerImpl.java: 2814) at org.datanucleus.ObjectManagerImpl.flush(ObjectManagerImpl.java: 2754) at org.datanucleus.ObjectManagerImpl.preCommit(ObjectManagerImpl.java: 2893) at org.datanucleus.TransactionImpl.internalPreCommit(TransactionImpl.java: 369) at org.datanucleus.TransactionImpl.commit(TransactionImpl.java:256) at org.datanucleus.ObjectManagerImpl.close(ObjectManagerImpl.java: 801) at org.datanucleus.jdo.JDOPersistenceManager.close(JDOPersistenceManager.java: 271) at testapp.saveComment.doGet(saveComment.java:43) at javax.servlet.http.HttpServlet.service(HttpServlet.java:693) at javax.servlet.http.HttpServlet.service(HttpServlet.java:806) at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java: 511) at org.mortbay.jetty.servlet.ServletHandler $CachedChain.doFilter(ServletHandler.java:1166) at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java: 97) at org.mortbay.jetty.servlet.ServletHandler $CachedChain.doFilter(ServletHandler.java:1157) at com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java: 35) at org.mortbay.jetty.servlet.ServletHandler $CachedChain.doFilter(ServletHandler.java:1157) at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java: 43) at org.mortbay.jetty.servlet.ServletHandler $CachedChain.doFilter(ServletHandler.java:1157) at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java: 388) at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java: 216) at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java: 182) at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java: 765) at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java: 418) at com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java: 238) at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java: 152) at org.mortbay.jetty.Server.handle(Server.java:326) at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java: 542) at org.mortbay.jetty.HttpConnection $RequestHandler.headerComplete(HttpConnection.java:923) at com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java: 76) at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404) at com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java: 135) at com.google.apphosting.runtime.JavaRuntime.handleRequest(JavaRuntime.java: 250) at com.google.apphosting.base.RuntimePb$EvaluationRuntime $6.handleBlockingRequest(RuntimePb.java:7115) at com.google.apphosting.base.RuntimePb$EvaluationRuntime $6.handleBlockingRequest(RuntimePb.java:7113) at com.google.net.rpc.impl.BlockingApplicationHandler.handleRequest(BlockingApplicationHandler.java: 24) at com.google.net.rpc.impl.RpcUtil.runRpcInApplication(RpcUtil.java: 398) at com.google.net.rpc.impl.Server$2.run(Server.java:852) at com.google.tracing.LocalTraceSpanRunnable.run(LocalTraceSpanRunnable.java: 56) at com.google.tracing.LocalTraceSpanBuilder.internalContinueSpan(LocalTraceSpanBuilder.java: 576) at com.google.net.rpc.impl.Server.startRpc(Server.java:807) at com.google.net.rpc.impl.Server.processRequest(Server.java:369) at com.google.net.rpc.impl.ServerConnection.messageReceived(ServerConnection.java: 442) at com.google.net.rpc.impl.RpcConnection.parseMessages(RpcConnection.java: 319) at com.google.net.rpc.impl.RpcConnection.dataReceived(RpcConnection.java: 290) at com.google.net.async.Connection.handleReadEvent(Connection.java: 474) at com.google.net.async.EventDispatcher.processNetworkEvents(EventDispatcher.java: 831) at com.google.net.async.EventDispatcher.internalLoop(EventDispatcher.java: 207) at com.google.net.async.EventDispatcher.loop(EventDispatcher.java: 103) at com.google.net.rpc.RpcService.runUntilServerShutdown(RpcService.java: 251) at com.google.apphosting.runtime.JavaRuntime $RpcRunnable.run(JavaRuntime.java:417) at java.lang.Thread.run(Unknown Source) Any thoughts on what could be causing this? 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