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I'm implementing an UserCollectionType for a custom collection that
extends HashMap.
With the log4j level set to 'debug' I get ClassCastException at org.hibernate.type.CollectionType.toLoggableString(CollectionType.java:152), when retrieving the graph.
If log4j level is set to 'WARN' or 'INFO" it works fine.
Any help?
The classes are:

public interface InfoMap extends Map {
public BigDecimal getTotal();
public Collection getAccounts();
public AccountNumber[] getAccountList();
}

public class InfoMapImpl extends HashMap implements InfoMap {
public InfoMapImpl() {
super();
}
public BigDecimal getTotal() {

BigDecimal disbTotal = new BigDecimal(0);

for (Iterator a = this.values().iterator(); a.hasNext();) {
Info disbInfo = (Info)a.next();

BigDecimal disbAmount = disbInfo.getDisAmount().getAmount();

if (disbAmount == null) {
throw new RuntimeException("Missing amount");
}
else {
disbTotal = disbTotal.add(disbAmount);
}
}
return disbTotal;
}
public Collection getAccounts() {
ArrayList list = new ArrayList();
for (Iterator a = this.values().iterator(); a.hasNext();) {
Info disbInfo = (Info)a.next();
if (disbInfo.getAccountNumber() == null) {
throw new RuntimeException("Missing account");
}
else {
list.add(disbInfo);
}
}
return list;
}
public AccountNumber[] getAccountList() {
return (AccountNumber[])getAccounts().toArray(new AccountNumber[0]);
}
}

THE WRAPPER
public class PersistentInfoMapImpl extends PersistentMap implements InfoMap {
public PersistentInfoMapImpl(SessionImplementor session) {
super(session);
}

public PersistentInfoMapImpl(SessionImplementor session, InfoMap map) {
super(session, map);
}
public BigDecimal getTotal() {

BigDecimal disbTotal = new BigDecimal(0);

for (Iterator a = this.values().iterator(); a.hasNext();) {
Info disbInfo = (Info)a.next();

BigDecimal disbAmount = disbInfo.getDisAmount().getAmount();

if (disbAmount == null) {
throw new RuntimeException("Missing amount");
}
else {
disbTotal = disbTotal.add(disbAmount);
}
}
return disbTotal;
}
public Collection getAccounts() {
ArrayList list = new ArrayList();
for (Iterator a = this.values().iterator(); a.hasNext();) {
Info disbInfo = (Info)a.next();
if (disbInfo.getAccountNumber() == null) {
throw new RuntimeException("Missing account");
}
else {
list.add(disbInfo);
}
}
return list;
}
public AccountNumber[] getAccountList() {
return (AccountNumber[])getAccounts().toArray(new AccountNumber[0]);
}
}

THE USER COLLECTION TYPE
public class InfoMapImplType implements UserCollectionType {
public PersistentCollection instantiate(SessionImplementor session, CollectionPersister persister) throws HibernateException {
return new PersistentInfoMapImpl(session);
}
public PersistentCollection wrap(SessionImplementor session, Object collection) {
if (session.getEntityMode() == EntityMode.DOM4J) {
throw new IllegalStateException("dom4j not supported");
}
else {
return new PersistentInfoMapImpl(session, (InfoMap)collection);
}
}

public Iterator getElementsIterator(Object collection) {
return ((InfoMap)collection).values().iterator();
}

public boolean contains(Object collection, Object entity) {
return ((InfoMap)collection).values().contains(entity);
}
public Object indexOf(Object collection, Object entity) {
return null;
}
public Object replaceElements(Object original, Object target, CollectionPersister persister, Object owner, Map copyCache, SessionImplementor session)
throws HibernateException {
InfoMap result = (InfoMap)target;
result.clear();
result.putAll((InfoMap)original);
return result;
}
public Object instantiate() {
return new InfoMapImpl();
}
}

Hibernate version:
3.1.2
Mapping documents:
<map
name="Infos"
collection-type="com.persistence.hibernate.usertype.InfoMapImplType"
cascade="all-delete-orphan"
lazy="false"
outer-join="true"
table="INFO"
fetch="join"
inverse="true">
<key not-null="true">
<column
name="REF_NUM"
not-null="true">
</column>
</key>
<map-key type="integer">
<column
name="SEQ_NUM"
not-null="true">
</column>
</map-key>
<one-to-many
class="com.sys.details.InfoImpl" />
</map
Code between sessionFactory.openSession() and session.close():

Full stack trace of any exception that occurs:
java.lang.ClassCastException: com.persistence.hibernate.usertype.PersistentInfoMapImpl
at org.hibernate.type.CollectionType.toLoggableString(CollectionType.java:152)
at org.hibernate.pretty.Printer.toString(Printer.java:53)
at org.hibernate.pretty.Printer.toString(Printer.java:90)
at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:97)
at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26)
at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1009)
at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:356)
at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
at org.springframework.orm.hibernate3.HibernateTransactionManager.doCommit(HibernateTransactionManager.java:490)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.processCommit(AbstractPlatformTransactionManager.java:495)
at org.springframework.transaction.support.AbstractPlatformTransactionManager.commit(AbstractPlatformTransactionManager.java:468)
at org.springframework.transaction.interceptor.TransactionAspectSupport.doCommitTransactionAfterReturning(TransactionAspectSupport.java:258)
at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:106)
at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:144)
at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:174)
at $Proxy1.retrieveCreditApplication(Unknown Source)
at test.com.hibernate.MappingTestCase.testSaveApplication(MappingTestCase.java:367)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:79)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:41)
at java.lang.reflect.Method.invoke(Method.java:386)
at junit.framework.TestCase.runTest(TestCase.java:154)
at junit.framework.TestCase.runBare(TestCase.java:127)
at junit.framework.TestResult$1.protect(TestResult.java:106)
at junit.framework.TestResult.runProtected(TestResult.java:124)
at junit.framework.TestResult.run(TestResult.java:109)
at junit.framework.TestCase.run(TestCase.java:118)
at junit.framework.TestSuite.runTest(TestSuite.java:208)
at junit.framework.TestSuite.run(TestSuite.java:203)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:392)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:276)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:167)

Name and version of the database you are using:
DB2 OS/390 8.1.0
The generated SQL (show_sql=true):

Debug level Hibernate log excerpt: