4 Replies Latest reply on Oct 31, 2007 11:00 AM by Pete Muir

    Object disappear

    Eleas Newbie

      Good day,

      Let me show you a real magic! But I don't know the secret... If you know it - please describe me! It's real problem for me...

      1 Class:


      package xxx.finders;
      
      import org.jboss.seam.framework.EntityController;
      import org.jboss.seam.log.Log;
      import org.jboss.seam.annotations.Logger;
      import org.jboss.seam.annotations.Transactional;
      import xxx.Lecture;
      
      import java.util.List;
      import java.util.ArrayList;
      
      public class AbstractFinder<K>
      {
       private String query;
      
       private List<K> result;
      
      
       public final String getQuery()
       {
       return query;
       }
      
       public final void setQuery(String query)
       {
       this.query = query;
       }
      
       @Transactional
       public void search()
       {
       System.out.println("start search. This:"+this);
       this.result = searchResult();
       System.out.println("Cal result: "+result+" This:"+this);
       }
      
       @Transactional
       protected List<K> searchResult()
       {
       return new ArrayList<K>();
       }
      
       @Transactional
       public final List<K> getResult()
       {
       System.out.println("Start getResult. this:"+this);
       if(result==null)
       {
       System.out.println("searching"+this);
       search();
       System.out.println("Cal result: "+result+" This:"+this);
       }
       System.out.println("result: "+result+"this:"+this);
       return result;
       }
      }
      


      2 class
      package xxx.finders;
      
      import xxx.testtree.Test;
      
      import java.util.List;
      import java.util.ArrayList;
      
      import org.jboss.seam.annotations.Name;
      import org.jboss.seam.annotations.Logger;
      import org.jboss.seam.annotations.In;
      import org.jboss.seam.annotations.Scope;
      import org.jboss.seam.log.Log;
      import org.jboss.seam.ScopeType;
      
      import javax.persistence.EntityManager;
      
      @Name("testFinder")
      public class TestFinder extends AbstractFinder<Test>
      {
       @In
       private EntityManager entityManager;
      
       @Logger
       private Log log;
      
       protected List<Test> searchResult()
       {
       log.info("Invoked!!!");
       String query = getQuery();
       if(query==null || query.equals(""))
       {
       List<Test> tests = (List<Test>)entityManager.createQuery("select object(t) from Test t order by t.title").getResultList();
       log.info("Tests: "+tests);
       return tests;
       }
       else
       {
       List<Test> ret = new ArrayList<Test>();
       String sql = "select object(t) from Test t where t.title like :query order by t.title";
       ret.addAll(entityManager.createQuery(sql).setParameter("query", "%"+query+"%").getResultList());
       sql = "select object(t) from Test t, Domain d where t.domain=d and d.title like :query order by t.title";
       ret.addAll(entityManager.createQuery(sql).setParameter("query", "%"+query+"%").getResultList());
       return ret;
       }
       }
      }
      


      Now the magic!

      Externaly from JSF page I'm trying to get result property from 'testfinder' bean. And there I recieve null! But look to the logs:

      2007-10-31 14:43:09,921 INFO [STDOUT] start search. This:xxx.finders.TestFinder@f09d3d
      2007-10-31 14:43:09,921 INFO [xxx.finders.TestFinder] Invoked!!!
      2007-10-31 14:43:09,921 DEBUG [org.hibernate.jdbc.AbstractBatcher] about to open PreparedStatement (open PreparedStatements: 0, globally: 0)
      2007-10-31 14:43:09,921 DEBUG [org.hibernate.jdbc.ConnectionManager] opening JDBC connection
      2007-10-31 14:43:09,921 DEBUG [org.hibernate.SQL] select test0_.test_id as test1_74_, test0_.title as title74_, test0_.content as content74_, test0_.author_id as author5_74_, test0_.domain_id as domain4_74_ from tests test0_ order by test0_.title
      2007-10-31 14:43:09,921 DEBUG [org.hibernate.jdbc.AbstractBatcher] about to open ResultSet (open ResultSets: 0, globally: 0)
      2007-10-31 14:43:09,921 DEBUG [org.hibernate.loader.Loader] result row: EntityKey[xxx.testtree.Test#1]
      2007-10-31 14:43:09,921 DEBUG [org.hibernate.jdbc.AbstractBatcher] about to close ResultSet (open ResultSets: 1, globally: 1)
      2007-10-31 14:43:09,921 DEBUG [org.hibernate.jdbc.AbstractBatcher] about to close PreparedStatement (open PreparedStatements: 1, globally: 1)
      2007-10-31 14:43:09,921 DEBUG [org.hibernate.jdbc.ConnectionManager] aggressively releasing JDBC connection
      2007-10-31 14:43:09,921 DEBUG [org.hibernate.jdbc.ConnectionManager] releasing JDBC connection [ (open PreparedStatements: 0, globally: 0) (open ResultSets: 0, globally: 0)]
      2007-10-31 14:43:09,921 DEBUG [org.hibernate.engine.StatefulPersistenceContext] initializing non-lazy collections
      2007-10-31 14:43:09,921 INFO [xxx.finders.TestFinder] Tests: [xxx.testtree.Test@1]
      2007-10-31 14:43:09,921 INFO [STDOUT] Cal result: [xxx.testtree.Test@1] This:xxx.finders.TestFinder@f09d3d
      2007-10-31 14:43:09,921 DEBUG [org.hibernate.ejb.AbstractEntityManagerImpl] Looking for a JTA transaction to join
      2007-10-31 14:43:09,921 DEBUG [org.hibernate.ejb.AbstractEntityManagerImpl] Transaction already joined
      2007-10-31 14:43:09,921 INFO [STDOUT] Cal result: null This:xxx.finders.TestFinder@f09d3d
      2007-10-31 14:43:09,921 DEBUG [org.hibernate.ejb.AbstractEntityManagerImpl] Looking for a JTA transaction to join
      2007-10-31 14:43:09,921 DEBUG [org.hibernate.ejb.AbstractEntityManagerImpl] Transaction already joined
      2007-10-31 14:43:09,921 INFO [STDOUT] result: nullthis:xxx.finders.TestFinder@f09d3d
      


      Most interesting (the first and the last line):
      2007-10-31 14:43:09,921 INFO [STDOUT] Cal result: [xxx.testtree.Test@1] This:xxx.finders.TestFinder@f09d3d
      2007-10-31 14:43:09,921 DEBUG [org.hibernate.ejb.AbstractEntityManagerImpl] Looking for a JTA transaction to join
      2007-10-31 14:43:09,921 DEBUG [org.hibernate.ejb.AbstractEntityManagerImpl] Transaction already joined
      2007-10-31 14:43:09,921 INFO [STDOUT] Cal result: null This:xxx.finders.TestFinder@f09d3d
      

      That's mean that object disapear somewhere between method invokation! But where and why???

      Please, help me!