5 Replies Latest reply on Jan 31, 2005 7:45 AM by Pablo Javier Santa Cruz Cosp

    Could not create entity

    Mohamed Osman Newbie

      Hallo everyone , I am a new user and have a probelm with my J2EE Application and JBOSS

      the problem is i use xdochlet to generate the id for my EJB ,
      wenn i try to create an EJB JbOSS throw an Exception:

      23:44:35,132 ERROR [ProjectManagerBean] Could not create entity:java.sql.SQLExce
      ption: Try to insert null into a non-nullable column: column: ID table: PROJECT
      in statement [INSERT INTO PROJECT (name, url) VALUES (?, ?)]


      here is my EJB:
      /*
       * Created on 31.12.2004
       *
       */
      package de.tuberlin.ivs.vspj.pvt.entity.ejb;
      
      import java.rmi.RemoteException;
      import java.util.Collection;
      
      import javax.ejb.CreateException;
      import javax.ejb.EJBException;
      import javax.ejb.EntityBean;
      import javax.ejb.EntityContext;
      import javax.ejb.RemoveException;
      
      import de.tuberlin.ivs.vspj.pvt.entity.Project;
      
      /**
       * A ProjectBean is an CMP-implementation of the <code>Project</code>-interface.
       *
       * @author Mohamed Osman
       * @version $Revision: 1.1.1.1 $
       *
       * @ejb.bean name = "Project"
       * display-name = "TopicProject EJB"
       * description = "Represents a Project"
       * type = "CMP"
       * cmp-version = "2.x"
       * view-type = "local"
       * local-jndi-name = "ejb/ProjectLocal"
       * local-business-interface = "de.tuberlin.ivs.vspj.pvt.entity.Project"
       * primkey-field = "id"
       *
       *
       * @ejb.finder signature="java.util.Collection findAll()"
       * unchecked="true"
       * @ejb.value-object
       * implements = "de.tuberlin.ivs.vspj.pvt.entity.Project"
       *
       */
      public abstract class ProjectBean implements EntityBean, Project {
      
       /**
       * Get the id of the project.
       *
       * @ejb.pk-field
       * @ejb.persistence
       * @ejb.interface-method
       * @jboss.persistence auto-increment = "true"
       * @return the id of the project
       */
       public abstract Integer getId();
       /**
       * Set the id of the project.
       *
       * @param id the id of the project
       */
       public abstract void setId(Integer id);
      
       /**
       * Get the name of this project.
       *
       * @ejb.persistence
       * @ejb.interface-method
       * @return the name of the project
       */
       public abstract String getName();
       /**
       * Set the name of the project.
       *
       * @ejb.interface-method
       * @param name the name of the project
       */
       public abstract void setName(String name);
      
       /**
       * Get the url of the project.
       *
       * @ejb.persistence
       * @ejb.interface-method
       * @return the url of this project
       */
       public abstract String getUrl();
       /**
       * Set the url of the project.
       *
       * @ejb.interface-method
       * @param url The url of the project.
       */
       public abstract void setUrl(String url);
      
       /* *//**
       *
       * Get the publications of the project with the given id.
       * @ejb.interface-method
       * @ejb.relation name = "ProjPubs"
       * cascade-delete = "no"
       * role-name = "Project-has-Publications"
       * target-ejb = "Publication"
       * @jboss.relation-table create-table = "true"
       * table-name = "ProjPubs"
       * @jboss.relation fk-column = "id"
       * related-pk-field = "id"
       *
       * @param id the id of the project.
       * @return the publications of the project with the given id.
       *//*
       public abstract Collection getPublications() ;*/
      
       /**
       * Creates an instance of a new Project.
       * Returns the primary key of the new entity or null if cmp is used.
       *
       * @ejb.create-method
       * @param name the name of the project.
       * @param url the url of the project.
       * @return The local Interface of the ejb.
       * @throws CreateException If server failed to create entity.
       */
       public Integer ejbCreate(String name, String url) throws CreateException {
       setName(name);
       setUrl(url);
       return null;
       }
      
       /**
       * Does nothing.
       * @param name The name of the project.
       * @param url The url of the project.
       * @throws CreateException If server failed to create the entity.
       */
       public void ejbPostCreate(String name, String url)
       throws CreateException {
       }
      
      
       /**
       * Sets the EntityContext.
       * @param ctx The EntityContext set by the server.
       * @throws EJBException If a general error occurs.
       * @throws RemoteException If an Error occurs during remote method invocation.
       */
       public void setEntityContext(EntityContext ctx) throws EJBException,RemoteException {}
       /**
       * Unsets the EntityContext.
       * @throws EJBException If a general error occurs.
       * @throws RemoteException If an Error occurs during remote method invocation.
       */
       public void unsetEntityContext() throws EJBException, RemoteException {}
       /**
       * Removes the project from persistent storage.
       * @throws RemoveException If an error occurs during removal of the project.
       * @throws EJBException If a general error occurs.
       * @throws RemoteException If an Error occurs during remote method invocation.
       */
       public void ejbRemove() throws RemoveException, EJBException,RemoteException {}
       /**
       * @see javax.ejb.EntityBean#ejbActivate()
       */
       public void ejbActivate() throws EJBException, RemoteException { }
       /**
       * @see javax.ejb.EntityBean#ejbPassivate()
       */
       public void ejbPassivate() throws EJBException, RemoteException { }
       /**
       * @see javax.ejb.EntityBean#ejbLoad()
       */
       public void ejbLoad() throws EJBException, RemoteException { }
       /**
       * @see javax.ejb.EntityBean#ejbStore()
       */
       public void ejbStore() throws EJBException, RemoteException { }
      }
      


      and here is the standardjbosscmp-jdbc.xml :

      <jbosscmp-jdbc>
      
       <defaults>
       <datasource>java:/DefaultDS</datasource>
       <!-- optional since 4.0 <datasource-mapping>Hypersonic SQL</datasource-mapping> -->
      
       <create-table>true</create-table>
       <remove-table>false</remove-table>
       <read-only>false</read-only>
       <read-time-out>300000</read-time-out>
       <row-locking>false</row-locking>
       <pk-constraint>true</pk-constraint>
       <fk-constraint>false</fk-constraint>
       <preferred-relation-mapping>foreign-key</preferred-relation-mapping>
       <read-ahead>
       <strategy>on-load</strategy>
       <page-size>1000</page-size>
       <eager-load-group>*</eager-load-group>
       </read-ahead>
       <list-cache-max>1000</list-cache-max>
       <clean-read-ahead-on-load>false</clean-read-ahead-on-load>
      
       <unknown-pk>
       <key-generator-factory>UUIDKeyGeneratorFactory</key-generator-factory>
       <unknown-pk-class>java.lang.String</unknown-pk-class>
       <jdbc-type>VARCHAR</jdbc-type>
       <sql-type>VARCHAR(32)</sql-type>
       </unknown-pk>
      
       <entity-command name="hsqldb-fetch-key"/>
       <ql-compiler>org.jboss.ejb.plugins.cmp.jdbc.JDBCEJBQLCompiler</ql-compiler>
       </defaults>
      ...
      



      please i need your help.