Java.lang.Long cannot be added to java.lang.String

Question

I need to List<myClass>iterate over a in jsp. This is how I get the list:

(when I commented on this, the page loaded just fine).

 <%
      List<myClass> pjList = null;
      StringBuffer ejbQuery = new StringBuffer();

      EntityManagerFactory emf = Persistence.createEntityManagerFactory("myPersistence");
      EntityManager em = emf.createEntityManager();

      ejbQuery.append("SELECT e ");
      ejbQuery.append("FROM myClass e ");
      pjList = em.createQuery(ejbQuery.toString()).getResultList();


for(myClass pj : pjList)
{
    %>
    <br />
    <%= pj.getSomeField()%>
    <br />
    <%
}
%>

This is the error that I get when I run on the Google appengine. locally it works fine.

Uncaught exception from servlet
java.lang.ClassCastException: java.lang.Long cannot be cast to java.lang.String
 at org.datanucleus.store.appengine.DatastoreFieldManager.fetchStringField(DatastoreFieldManager.java:188)
 at org.datanucleus.state.AbstractStateManager.replacingStringField(AbstractStateManager.java:1180)
 at ar.edu.kennedy.proveedores.entities.ProEnteEy.jdoReplaceField(ProEnteEy.java)
 at ar.edu.kennedy.proveedores.entities.ProPersonaJuridicaEy.jdoReplaceField(ProPersonaJuridicaEy.java)
 at ar.edu.kennedy.proveedores.entities.ProEnteEy.jdoReplaceFields(ProEnteEy.java)
 at org.datanucleus.state.JDOStateManagerImpl.replaceFields(JDOStateManagerImpl.java:2772)
 at org.datanucleus.state.JDOStateManagerImpl.replaceFields(JDOStateManagerImpl.java:2791)
 at org.datanucleus.store.appengine.DatastorePersistenceHandler.fetchObject(DatastorePersistenceHandler.java:443)
 at org.datanucleus.store.appengine.query.DatastoreQuery.entityToPojo(DatastoreQuery.java:433)
 at org.datanucleus.store.appengine.query.DatastoreQuery.entityToPojo(DatastoreQuery.java:391)
 at org.datanucleus.store.appengine.query.DatastoreQuery.access$800(DatastoreQuery.java:97)
 at org.datanucleus.store.appengine.query.DatastoreQuery$5.apply(DatastoreQuery.java:515)
 at org.datanucleus.store.appengine.query.DatastoreQuery$5.apply(DatastoreQuery.java:507)
 at org.datanucleus.store.appengine.query.StreamingQueryResult.resolveNext(StreamingQueryResult.java:137)
 at org.datanucleus.store.appengine.query.StreamingQueryResult$1.computeNext(StreamingQueryResult.java:163)
 at org.datanucleus.store.appengine.query.AbstractIterator.tryToComputeNext(AbstractIterator.java:132)
 at org.datanucleus.store.appengine.query.AbstractIterator.hasNext(AbstractIterator.java:127)
 at org.datanucleus.store.appengine.query.StreamingQueryResult$AbstractListIterator.hasNext(StreamingQueryResult.java:229)
 at org.apache.jsp.busqueda_jsp._jspService(busqueda_jsp.java:138)

If I use ListIterator and call hasNext (), I get the same error. Help me understand what is happening, how to solve it?

Answer 1

It looks like the wrong display you have from "myclass".

There is a field marked as "String" when it is actually a "number".

, , -, StackTrace, , .

, .

, "" String . , .

Answer 2

, myClass String, . DataNucleus JDO , , . , .

Answer 3

, myClass (, - XML;-) persistence.

Answer 4

- java, fo pdf tomcat 6 (Windows XP). unix, ( tomcat 7), java.lang.ClassCastException: java.lang.Long java.lang.Integer. , , , , tomcat 7 6. , , .

Answer 5

criteria.add(Expression.like("status", 115));

Error: java.lang.classCastException: java.lang.Integer cannot pass to java.lang.String

Do the following:

criteria.add(Expression.like("status", new String("115")));