Seamgen throws ExporterException when I try to generate user interface for an entity with composite primarykey. I got the following error:

jar:

[hibernate] Executing Hibernate Tool with a JPA Configuration

[hibernate] 1. task: generic exportertemplate: view/list.xhtml.ftl

[hibernate] log4j:WARN No appenders could be found for logger (org.hibernate.cfg.annotations.Version).

[hibernate] log4j:WARN Please initialize the log4j system properly.

[hibernate] An exception occurred while running exporter #2:generic exportertemplate: view/list.xhtml.ftl

[hibernate] To get the full stack trace run ant with -verbose

[hibernate] org.hibernate.tool.hbm2x.ExporterException: Error while processing Entity: st.horting.leagbench.entity.ShootCase with template view/list.xhtml.ftl

[hibernate] freemarker.template.TemplateModelException: No signature of method isComponent matches (java.lang.Object)



BUILD FAILED

/home/johan/Software/jboss-seam-2.2.0.GA/seam-gen/build.xml:1598: org.hibernate.tool.hbm2x.ExporterException: Error while processing Entity: st.horting.leagbench.entity.ShootCase with template view/list.xhtml.ftl

Entity class:
@Entity
@IdClass(ShootCasePK.class)
public class ShootCase implements Serializable
{
   private ShootCasePK pk = new ShootCasePK(); 
   private TestCase testCase;
   private int execTime;
   private Set<ShootCaseRound> shootCaseRounds = new HashSet<ShootCaseRound>();
   private Appraisal appraisal;
   
   
   /**
    * @return the pk
    */
   @Transient
   public ShootCasePK getPk()
   {
      return this.pk;
   }

   /**
    * @return the shootId
    */
   @Id
   public Integer getShootId()
   {
      return this.pk.getShootId();
   }

   /**
    * @return the caseId
    */
   @Id
   public Integer getCaseId()
   {
      return this.pk.getCaseId();
   }

   @ManyToOne
   @JoinColumn(name="caseId", referencedColumnName="id",
         insertable=false, updatable=false)
   public TestCase getTestCase()
   {
      return testCase;
   }
   
   @OneToMany
   @JoinColumns({@JoinColumn(name="shootId"),@JoinColumn(name="caseId")
  })
   public Set<ShootCaseRound> getShootCaseRounds()
   {
      return this.shootCaseRounds;
   }
   
   /**
    * @return the execTime
    * Execution time for test shoot of test case in seconds.
    */
   @Column(nullable=true)
   public int getExecTime()
   {
      return this.execTime;
   }
   
   /**
    * @return the appraisal
    */
   @Enumerated(EnumType.ORDINAL)
   public Appraisal getAppraisal()
   {
      return this.appraisal;
   }

   /**
    * @param shootId the shootId to set
    */
   public void setShootId( Integer shootId )
   {
      this.pk.setShootId( shootId );
   }

   /**
    * @param caseId the caseId to set
    */
   public void setCaseId( Integer caseId )
   {
      this.pk.setCaseId( caseId );
   }
   
   /**
    * @param testCase the testCase to set
    */
   public void setTestCase( TestCase testCase )
   {
      this.testCase = testCase;
   }

   /**
    * @param shootCaseRounds the shootCaseRounds to set
    */
   public void setShootCaseRounds( Set<ShootCaseRound> shootCaseRounds )
   {
      this.shootCaseRounds = shootCaseRounds;
   }

   /**
    * @param execTime the execution time to set
    */
   public void setExecTime( int execTime )
   {
      this.execTime = execTime;
   }

   /* (non-Javadoc)
    * @see java.lang.Object#equals(java.lang.Object)
    */
   @Override
   public boolean equals( Object obj )
   {
      if (obj == this)
         return true;
      if ( ! (obj instanceof ShootCase))
         return false;
      ShootCase that = (ShootCase)obj;
      return this.pk.equals( that.pk );
   }

   /* (non-Javadoc)
    * @see java.lang.Object#hashCode()
    */
   @Override
   public int hashCode()
   {
      return this.pk.hashCode();
   }

   
   /**
    * @param appraisal the appraisal to set
    */
   public void setAppraisal( Appraisal appraisal )
   {
      this.appraisal = appraisal;
   }  
}

Primarykey class:
public class ShootCasePK implements Serializable
{
   private Integer shootId;
   private Integer caseId;
   
   public ShootCasePK()
   { 
      this(0,0);
   }

   public ShootCasePK(Integer shootId, Integer caseId)
   {
      this.shootId = shootId;
      this.caseId = caseId;
   }
   
   /**
    * @return the shootId
    */
   public Integer getShootId()
   {
      return this.shootId;
   }
   
   /**
    * @param shootId the shootId to set
    */
   public void setShootId( Integer shootId )
   {
      this.shootId = shootId;
   }
   
   /**
    * @return the caseId
    */
   public Integer getCaseId()
   {
      return this.caseId;
   }
   
   /**
    * @param caseId the caseId to set
    */
   public void setCaseId( Integer caseId )
   {
      this.caseId = caseId;
   }

   /* (non-Javadoc)
    * @see java.lang.Object#equals(java.lang.Object)
    */
   @Override
   public boolean equals( Object obj )
   {
      if (obj == this)
         return true;
      if ( ! (obj instanceof ShootCasePK))
         return false;
      ShootCasePK pk = (ShootCasePK)obj;
      if ( ! shootId.equals( pk.shootId ))
         return false;
      if ( ! caseId.equals( pk.caseId ))
         return false;
      return true;
   }

   /* (non-Javadoc)
    * @see java.lang.Object#hashCode()
    */
   @Override
   public int hashCode()
   {
      return (shootId.intValue() * 149) + caseId.intValue();
   }   
}