Java JDO异常：标识符未解析（不是静态字段）

我正在使用JDO使对象持久化。我已经运行代码很多次了。有时，我会让事情持续下去，没有任何错误。有时，我会收到以下错误

org.datanucleus.exceptions.NucleusUserException

javax.jdo.JDOUserException

我不明白为什么它有时成功运行，有时失败。这些都是随机发生的。我的应用程序正在注册期间验证新用户。这是我的密码

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因此，您从某个操作中获得了一些异常，但没有说明该异常的操作是什么，或者该异常的堆栈跟踪是什么？没有人能在这些细节上帮助你。AppEngine使用的JDO版本太旧了，你不可能再找到支持它的人了。我在你的问题中添加了完整的堆栈跟踪，很遗憾，这不是完整的堆栈跟踪。e、 printStackTrace还提供嵌套异常，根本原因异常是必需的…因此，您从某个操作中获得一些异常，但不说明该异常的操作是什么，或者该异常的堆栈跟踪是什么？没有人能在这些细节上帮助你。AppEngine使用的JDO版本太旧了，你不可能再找到支持它的人了。我在你的问题中添加了完整的堆栈跟踪，很遗憾，这不是完整的堆栈跟踪。e、 printStackTrace还提供嵌套异常，根本原因异常是必需的。。。

> ##    User.java(entity being persisted) ##


 @Entity
 @PersistenceCapable

 public class User {

@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
public String userName;

@Persistent
private String name, password, city, bikeModel, age;

public User(){

}
public User(String name, String uname, String pswd, String age, String city, String bike){
    this.name=name;
    this.userName=uname;
    this.password=pswd;
    this.age=age;
    this.city=city;
    this.bikeModel=bike;
}

public String getUserName() {
    return userName;
}
//rest of the getters
}



    //Getting SignUp form values
    String name=req.getParameter("name1");
    String uname=req.getParameter("uname1");
    String pswd=req.getParameter("pswd1");
    String age=req.getParameter("age");
    String city=req.getParameter("city");
    String bike=req.getParameter("bike");

            //PeristenceManager instance
            PersistenceManager pm = PMF.get().getPersistenceManager();

            //Creating instance for persistent entity class
     User newEntry=new User(name,uname,pswd,age,city,bike);

            //Query to match the userName entered in form and that of the dataStore user
    Query q = pm.newQuery(User.class);
    q.setFilter("userName == userNameParam");
    q.declareParameters("String userNameParam");
            try{
      List<User> results = (List<User>) q.execute(uname);
      if (!results.isEmpty()) {
                //if userName is found in DataStore
            resp.sendRedirect("invalidUser.html");  
      } else{
             //If userName is not found in dataStore
          pm.makePersistent(newEntry);          
          resp.sendRedirect("success.html");
          return;
      }
     }**strong text**
    finally{

        System.out.println("Finally!");
    }

com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler: Exception message : Identifier Status is unresolved (not a static field)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler: Error in class DataAccessLayer
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 org.datanucleus.api.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException(NucleusJDOHelper.java:519)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 org.datanucleus.api.jdo.JDOQuery.executeWithArray(JDOQuery.java:321)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 com.cloudcodes.gcontrol.datastore.DataAccessLayer.searchObjects(DataAccessLayer.java:213)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 com.cloudcodes.gcontrol.businessaccesslayer.GLoginManager.getNewPasswordCSVs(GLoginManager.java:24202)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 com.cloudcodes.gcontrol.backends.ReadPasswordCSVFile.doGet(ReadPasswordCSVFile.java:71)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:125)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 com.google.apphosting.runtime.jetty.SaveSessionFilter.doFilter(SaveSessionFilter.java:37)


 com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter(JdbcMySqlConnectionCleanupFilter.java:60)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:50)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 com.google.apphosting.runtime.jetty.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:260)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 org.mortbay.jetty.Server.handle(Server.java:326)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:923)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 com.google.apphosting.runtime.jetty.RpcRequestParser.parseAvailable(RpcRequestParser.java:78)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 com.google.apphosting.runtime.jetty.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:148)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:504)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 com.google.tracing.TraceContext$TraceContextRunnable.runInContext(TraceContext.java:446)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 com.google.tracing.TraceContext$TraceContextRunnable$1.run(TraceContext.java:453)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 com.google.tracing.CurrentContext.runInContext(CurrentContext.java:276)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContextNoUnref(TraceContext.java:312)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 com.google.tracing.TraceContext$AbstractTraceContextCallback.runInInheritedContext(TraceContext.java:304)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 com.google.tracing.TraceContext$TraceContextRunnable.run(TraceContext.java:450)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:235)
com.cloudcodes.gcontrol.utility.ErrorHandler errorHandler:  
 java.lang.Thread.run(Thread.java:745)