Help on javax.persistence.EntityNotFoundException: deleted entity passed to persist - Sorry for reposting

[valatharv]

First of all sorry I am posting the issue again after long time. I tried other forums also but no success, I would really appreciate any help.... pls... Our first phase with seam application is almost complete, we are left with this urgent issue.

I am sure there is something minor which I am missing and mind be easy for any one of you.

Issue : When I try to remove QuantExperiment entity, using quantExperimentHome.remove(), I get the following error.
Error:
------
INFO  [STDOUT] CHECK, QuantExperimentHistoryRecords HJID is = 665, and QuantExperiment HJID is : 303
INFO  [STDOUT] CHECK, QuantExperimentHistoryRecords HJID is = 666, and QuantExperiment HJID is : 303

ERROR [application] javax.persistence.EntityNotFoundException: deleted entity passed to persist: [com.entity.QuantExperimentHistoryRecords#<null>]
javax.faces.el.EvaluationException: javax.persistence.EntityNotFoundException: deleted entity passed to persist: [com.entity.QuantExperimentHistoryRecords#<null>]
.....................

--For testing I am printing the id of both the entities in remove(), which is displayed in log above.

--Note : We are using "super.getInstance().getProject().getQuantExperiment().remove(getInstance());" else it will give the same error for QuantExperiment.
i.e. "javax.persistence.EntityNotFoundException: deleted entity passed to persist: [com.entity.QuantExperiment#<null>]"

Please help on the following error, I have tried various options but no success :(

QuantExperimentHome.java
-------------------------
public String remove(){     
     
     ////JUST TO CHECK////
     List<QuantExperimentHistoryRecords> qeHr= getInstance().getQuantExperimentHistoryRecords();          
     int xs=qeHr.size();          
     for(int i=0;i<xs;i++){               
          QuantExperimentHistoryRecords qeg=qeHr.get(i);     
          //entityManager.remove(qeg); // TRIED THIS ALSO
          System.out.println("CHECK, QuantExperimentHistoryRecords HJID is = "+qeg.getHjid()+", and QuantExperiment HJID is : "+qeg.getQuantExperiment().getHjid());
     }
     ////END CHECK////

     super.getInstance().getProject().getQuantExperiment().remove(getInstance());     
     return super.remove();
}


@Entity(name = "QuantExperiment")
public class QuantExperiment implements Equals, HashCode, ToString
{
     protected List<QuantExperimentHistoryRecords> quantExperimentHistoryRecords;
     protected Project project;

     @OneToMany(cascade = {CascadeType.ALL},fetch = FetchType.LAZY, mappedBy="quantExperiment")
     public List<QuantExperimentHistoryRecords> getQuantExperimentHistoryRecords() {
          if (quantExperimentHistoryRecords == null) {
               quantExperimentHistoryRecords = new ArrayList<QuantExperimentHistoryRecords>();
          }
          return this.quantExperimentHistoryRecords;
     }

     @ManyToOne(fetch = FetchType.LAZY, optional=false)
     public Project getProject() {
          return project;
     }
}

@Entity(name = "QuantExperimentHistoryRecords")
public class QuantExperimentHistoryRecords implements Equals, HashCode, ToString {
     
     protected Project project;
     protected QuantExperiment quantExperiment;

     @ManyToOne(fetch = FetchType.LAZY, optional=false)
     public QuantExperiment getQuantExperiment() {
          return quantExperiment;
     }

     @ManyToOne(fetch = FetchType.LAZY, optional=false)
     public Project getProject() {
          return project;
     }
}

@Entity(name = "Project")
public class Project implements Equals, HashCode, ToString
{
     protected List<QuantExperiment> quantExperiment;
     protected List<QuantExperimentHistoryRecords> quantExperimentHistoryRecords;

     @OneToMany(cascade = {CascadeType.ALL},fetch=FetchType.LAZY, mappedBy="project")
    public List<QuantExperiment> getQuantExperiment() {
        if (quantExperiment == null) {
            quantExperiment = new ArrayList<QuantExperiment>();
        }
         return this.quantExperiment;
    }

     @OneToMany(cascade = {CascadeType.ALL}, fetch = FetchType.LAZY, mappedBy="project")
    public List<QuantExperimentHistoryRecords> getQuantExperimentHistoryRecords() {
        if (quantExperimentHistoryRecords == null) {
            quantExperimentHistoryRecords = new ArrayList<QuantExperimentHistoryRecords>();
        }
        return this.quantExperimentHistoryRecords;
    }
}