i have implement a system to save information about user . So i have aggregation at my class so the user class has list from contact class ...etc in the first page "test it's just for register the user just by phone number " that must save the user in database but this cause error when i deploye my project in Google app engine < 500 server error >
and the other page for update the exist user who previously has been registered, so at this will add to the list which the user object has .
user class
@PersistenceCapable
public class User implements Serializable{
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key key;
@Persistent
public String userNumber;
@Persistent (mappedBy = "userC")
public List<Contact> UserContacts =new ArrayList<Contact>();
public void AddContact(String name,String number) {
Contact C=new Contact();
C.ContactName=name;
C.PhoneNumber=number;
this.UserContacts.add(C); }
}
Contact class
@PersistenceCapable
public class Contact implements Serializable{
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Key key;
@Persistent
public String ContactName;
@Persistent
public String PhoneNumber;
@Persistent
public User userC; }
this page cause register for the user test will get user phone number and sign up should create new user with this number test page
@SuppressWarnings("serial")
public class Test extends 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>");
}
}
this page take the number to create user
@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();
} } }
this page to continue update value at user object who already exist
@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>");
}
}
this page to save the information which cause error and no value will save at app engine
@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(); } }
this 111 for testing which i entered before as user phone number .
So how can i deal with lists and aggregation issues ??
when going to update the user information this error occurred
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)
