Google app engine java google ap引擎中的一对多关系导致错误？_Google App Engine_Servlets_Persistence_Jdo_Datanucleus

Google app engine java google ap引擎中的一对多关系导致错误？

google-app-engine servlets

Google app engine java google ap引擎中的一对多关系导致错误？,google-app-engine,servlets,persistence,jdo,datanucleus,Google App Engine,Servlets,Persistence,Jdo,Datanucleus,我已经实现了一个系统来保存有关用户的信息。所以我在我的类中有聚合，所以用户类有联系人类的列表…等等在第一页测试中，它仅用于按电话号码注册用户，必须将用户保存在数据库中，但当我在Google app engine中部署我的项目时，这会导致错误另一个页面用于更新先前已注册的exist用户，因此此时将添加到用户对象所拥有的列表中用户类此页面导致用户测试的注册将获得用户电话号码，注册时应使用此号码创建新用户测试页公共类测试扩展了HttpServlet{ public void doGet(

我已经实现了一个系统来保存有关用户的信息。所以我在我的类中有聚合，所以用户类有联系人类的列表…等等在第一页测试中，它仅用于按电话号码注册用户，必须将用户保存在数据库中，但当我在Google app engine中部署我的项目时，这会导致错误<500服务器错误>

另一个页面用于更新先前已注册的exist用户，因此此时将添加到用户对象所拥有的列表中

用户类

此页面导致用户测试的注册将获得用户电话号码，注册时应使用此号码创建新用户测试页

公共类测试扩展了HttpServlet{

public void doGet(HttpServletRequest req, HttpServletResponse resp)
        throws IOException {
        resp.setContentType("text/html");
        resp.getWriter().println("<html><body><form  method = \"POST\"     action=\"/signup\">" + "please enter ur number :"+"<h4><label>name :  <input name =  \"userphoneNUMBER\" type =  \"text \" size =  \"25 \" />  </label>"+"<p> <input type = \"submit\" value = \"Submit\" />"+ "</form></body></html>");

    }
}

此页面将继续更新已存在的用户对象的值

查询中的问题

改变这个

Query query = pm.newQuery("select from " + User.class.getName());

到

您没有选择任何列。这会导致sql语法错误

否。请不要这样做。这是JDOQL，您的建议无效。服务器错误显然会伴随原因、堆栈跟踪等。对它们保密不会帮助人们向您建议问题出在何处此错误发生于2012-07-15 14:16:11.786/saveinfo 50057ms 0kb Mozilla/5.0 Windows NT 6.1 AppleWebKit/536.11 KHTML，如Gecko Chrome/20.0.1132.57 Safari/536.11 92.253.89.127---[15/Jul/2012:14:16:11-0700]POST/saveinfo HTTP/1.1 500 0 url Mozilla/5.0 Windows NT 6.1 AppleWebKit/536.11 KHTML，如Gecko Chrome/20.0.1132.57 Safari/536.11 myurl ms=58 cpu_ms=19 api_cpu_ms=0 cpm_usd=0.000613实例=00C61B17C530C9A5370089084CBA4CB66E15 W 2012-07-15 14:16:11.782/saveinfojavax.jdo.jdouseXception:标识符应位于org.d的*字符1处atanucleus.jdo.NucleusJDOHelper.getJDOExceptionForNucleusExceptionNucleusJDOHelper.java:375位于org.datanucleus.jdo.JDOQuery.executeJDOQuery.java:230位于sstooree.SaveInfo.doPostSaveInfo.java:44位于javax.servlet.http.HttpServlet.serviceHttpServlet.java:637位于javax.servlet.http.HttpServlet.serviceHttpServlet.java:717因此您使用的查询是wrong…这不是完整的堆栈跟踪。真正的异常是嵌套的。因此，请将其放在帖子中，而不是放在注释中，并格式化为可读。好的，但我认为问题是由于@PersistentmappedBy=otherclass

@SuppressWarnings("serial")

public void doGet(HttpServletRequest req, HttpServletResponse resp)
        throws IOException {
        resp.setContentType("text/html");
        resp.getWriter().println("<html><body><form  method = \"POST\"     action=\"/signup\">" + "please enter ur number :"+"<h4><label>name :  <input name =  \"userphoneNUMBER\" type =  \"text \" size =  \"25 \" />  </label>"+"<p> <input type = \"submit\" value = \"Submit\" />"+ "</form></body></html>");

    }
}

@SuppressWarnings("serial")
public class SignUP extends HttpServlet {
    public void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws IOException {
        resp.setContentType("text/plain");
        String user_PhoneNumber=req.getParameter("userphoneNUMBER");
        User obj = new User();
    obj.userNumber=user_PhoneNumber;
    resp.getWriter().println(obj.userNumber );
        PersistenceManager pm = PMF.get().getPersistenceManager();

        try {
            pm.makePersistent(obj);
        } finally {
            pm.close();

        } }  }

    @SuppressWarnings("serial")
public class Testinfo extends HttpServlet {
    public void doGet(HttpServletRequest req, HttpServletResponse resp)
            throws IOException {
        resp.setContentType("text/html");
        resp.getWriter().println("<html><body><form  method = \"POST\" action=\"/saveinfo\">" +
                "<center> <h2>please fill this form :</h2> </br> "+
"<h4><label> ContactName :  <input name =  \"ContactName\" type =  \"text \" size =  \"25 \" />  </label>"
+
"<p> <input type = \"submit\" value = \"Submit\" />"+
                "</form></body></html>");
    }

    @SuppressWarnings("serial")
public class SaveInfo extends HttpServlet {
    public void doPost(HttpServletRequest req, HttpServletResponse resp)
            throws IOException {
        resp.setContentType("text/plain");

        String ContactName = req.getParameter("ContactName");
        String ContactNumber = req.getParameter("ContactNumber");
                   PersistenceManager pm = PMF.get().getPersistenceManager();
        Query query = pm.newQuery("select from " + User.class.getName());
        List<User> list = (List<User>) query.execute();
        for (User obj : list) {


            if (obj.userNumber.equals("111")) {
                 pm.currentTransaction().begin();
                                     obj.AddContact(ContactName, ContactNumber);

                pm.makePersistent(obj);

                 pm.currentTransaction().commit(); }
            }
                          pm.close(); }  }

Uncaught exception from servlet
javax.jdo.JDOUserException: Identifier expected at character 1 in "*" at         org.datanucleus.jdo.NucleusJDOHelper.getJDOExceptionForNucleusException(NucleusJDOHelper.java:375)
at org.datanucleus.jdo.JDOQuery.execute(JDOQuery.java:230)
at sstooree.SaveInfo.doPost(SaveInfo.java:44)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
at com.google.apphosting.utils.servlet.ParseBlobUploadFilter.doFilter(ParseBlobUploadFilter.java:102)
at org.mortbay.jetty.servlet.ServletHandler$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)

Query query = pm.newQuery("select from " + User.class.getName());

Query query = pm.newQuery("select * from " + User.class.getName());