[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-6313) ClassCastException specifying type="character" in hbm.xml

[Tom Jordahl (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-6313?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=43198#comment-43198 ] 

Tom Jordahl commented on HHH-6313:
----------------------------------

I am also seeing this error after upgrading from Hibernate 3.5.3 to 3.6.6.

It causes a regression in our test suites.

Hibernate 3.6.6 Stack trace:
    java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Character
        at org.hibernate.type.descriptor.java.CharacterTypeDescriptor.unwrap(CharacterTypeDescriptor.java:34)
        at org.hibernate.type.descriptor.sql.VarcharTypeDescriptor$1.doBind(VarcharTypeDescriptor.java:52)
        at org.hibernate.type.descriptor.sql.BasicBinder.bind(BasicBinder.java:91)
        at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:283)
        at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:278)
        at org.hibernate.param.NamedParameterSpecification.bind(NamedParameterSpecification.java:67)
        at org.hibernate.loader.hql.QueryLoader.bindParameterValues(QueryLoader.java:571)
        at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1716)
        at org.hibernate.loader.Loader.doQuery(Loader.java:801)
        at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:274)
        at org.hibernate.loader.Loader.doList(Loader.java:2533)
        at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2276)
        at org.hibernate.loader.Loader.list(Loader.java:2271)
        at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:452)
        at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:363)
        at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196)
        at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1268)
        at org.hibernate.impl.QueryImpl.list(QueryImpl.java:102)

I'll take a look at making a patch if I can. I am suspicious of the code in VarcharTypeDescriptor.java:
public <X> ValueBinder<X> getBinder(final JavaTypeDescriptor<X> javaTypeDescriptor) {
	return new BasicBinder<X>( javaTypeDescriptor, this ) {
		@Override
		protected void doBind(PreparedStatement st, X value, int index, WrapperOptions options) throws SQLException {
			st.setString( index, javaTypeDescriptor.unwrap( value, String.class, options ) );
		}
	};
}

It appears that is is trying to upwrap the character type as a string and this is what is trigger the cast exception, but I need to dig in to to figure out why the templated classes being used here are throwing the cast exception before any code (i.e. unwrap) is getting called.

Developer eyes on this (Steve Ebersole?) would be very helpful as this is blocking our upgrade to 3.6.




> ClassCastException specifying type="character" in hbm.xml
> ---------------------------------------------------------
>
>                 Key: HHH-6313
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6313
>             Project: Hibernate Core
>          Issue Type: Bug
>    Affects Versions: 3.6.0, 3.6.4, 3.6.5
>         Environment: Hibernate 3.6.5, Oracle 10g
>            Reporter: Martin
>
> I have a class containing a field of type java.lang.Character.
> I map this to an Oracle char(1 byte) field using an hmb.xml file as follows:
> <property name="IntroducedFlag" column="INTRODUCED" type="character" />
> At runtime this results in the following exception:
> java.lang.ClassCastException: java.lang.String cannot be cast to java.lang.Character
>  at org.hibernate.type.descriptor.java.CharacterTypeDescriptor.unwrap(CharacterTypeDescriptor.java:34)
>  at org.hibernate.type.descriptor.sql.VarcharTypeDescriptor$1.doBind(VarcharTypeDescriptor.java:52)
>  at org.hibernate.type.descriptor.sql.BasicBinder.bind(BasicBinder.java:91)
>  at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:282)
>  at org.hibernate.type.AbstractStandardBasicType.nullSafeSet(AbstractStandardBasicType.java:277)
>  at org.hibernate.loader.Loader.bindPositionalParameters(Loader.java:1873)
>  at org.hibernate.loader.Loader.bindParameterValues(Loader.java:1844)
>  at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1716)
>  at org.hibernate.loader.Loader.doQuery(Loader.java:801)
>  at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:274)
>  at org.hibernate.loader.Loader.doList(Loader.java:2533)
>  at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2276)
>  at org.hibernate.loader.Loader.list(Loader.java:2271)
>  at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:119)
>  at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1716)
>  at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:347)
> It works fine in Hibernate 3.5.6 but not in 3.6.0 onwards.
> Also probably related to this issue:
> https://forum.hibernate.org/viewtopic.php?f=1&t=1010175

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