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 Post subject: Getting ClassCastException from hibernate composite id
PostPosted: Tue Oct 27, 2009 12:29 am 

Joined: Tue Oct 27, 2009 12:07 am
Posts: 1

I have a table with primary composite key -

<class name="com.yahoo.sm3.metadata.dao.data.SegmentsVersions" table="segments_versions" catalog="metadata">
<composite-id name="id" class="com.yahoo.sm3.metadata.dao.data.SegmentsVersionsId">
<key-property name="segmentid" type="long">
<column name="segmentid" />
<key-property name="versionnumber" type="int">
<column name="versionnumber" />

POJO Class for the component SegmentsVersionsId is as follows -

public class SegmentsVersionsId implements Serializable {
static final long serialVersionUID = 123123;

private long segmentid;
private int versionnumber;

public SegmentsVersionsId() {

public SegmentsVersionsId(long segmentid, int versionnumber) {
this.segmentid = segmentid;
this.versionnumber = versionnumber;

public long getSegmentid() {
return this.segmentid;

public void setSegmentid(long segmentid) {
this.segmentid = segmentid;

public int getVersionnumber() {
return this.versionnumber;

public void setVersionnumber(int versionnumber) {
this.versionnumber = versionnumber;

public boolean equals(Object other) {
if ((this == other))
return true;
if ((other == null))
return false;
if (!(other instanceof SegmentsVersionsId))
return false;
SegmentsVersionsId castOther = (SegmentsVersionsId) other;

return (this.getSegmentid() == castOther.getSegmentid())
&& (this.getVersionnumber() == castOther.getVersionnumber());

public int hashCode() {
int result = 17;

result = 37 * result + (int) this.getSegmentid();
result = 37 * result + this.getVersionnumber();
return result;


I am using hibernate-3.3.2 and Spring-2.5.6 - getting the following error -

Caused by: java.lang.ClassCastException: com.yahoo.sm3.metadata.dao.data.SegmentsVersionsId
at com.yahoo.sm3.metadata.dao.hibernate.HibernateSegmentsVersionsDAO.saveSegmentsVersions(HibernateSegmentsVersionsDAO.java:20)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:592)
at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:307)
at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:182)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:149)
at org.springframework.orm.hibernate3.HibernateInterceptor.invoke(HibernateInterceptor.java:111)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:171)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:204)
at $Proxy2.saveSegmentsVersions(Unknown Source)
at com.yahoo.sm3.metadata.SegmentsVersionsApp.saveSegmentsVersions(SegmentsVersionsApp.java:27)
... 1 more

i used hbm2java to get the java codes for POJO and hbm files. I think everything looks okay to me whatever i read in the documentations. But still getting this weird error all the day today. I am hoping somebody can help find the cause.


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