I ran into an issue the other day with Hibernate configuration.

I have a bean that maps to a table in the database.  It has a column, featured, that only has values of 0 or 1.  For legacy reasons, we map that to an integer (turning it into a boolean is on the List Of Things To Do).

I ran into an issue, and was getting this error in the logs:

Caused by: java.lang.ClassCastException: java.lang.Boolean cannot be cast to java.lang.Integer
at org.hibernate.type.IntegerType.set(IntegerType.java:41)
at org.hibernate.type.NullableType.nullSafeSet(NullableType.java:136)
at org.hibernate.type.NullableType.nullSafeSet(NullableType.java:116)
at org.hibernate.loader.Loader.bindPositionalParameters(Loader.java:1698)
at org.hibernate.loader.Loader.bindParameterValues(Loader.java:1669)
at org.hibernate.loader.Loader.prepareQueryStatement(Loader.java:1554)
at org.hibernate.loader.Loader.doQuery(Loader.java:661)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:224)
at org.hibernate.loader.Loader.doList(Loader.java:2211)
at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2095)
at org.hibernate.loader.Loader.list(Loader.java:2090)
at org.hibernate.loader.criteria.CriteriaLoader.list(CriteriaLoader.java:94)
at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1569)
at org.hibernate.impl.CriteriaImpl.list(CriteriaImpl.java:283)

Here's the relevant section of the mapping file:

<property name="featured" type="integer" columnn="featured" />

I tried explicitly laying out the type of the SQL column:

<property name="featured" type="integer">
<column sql-type="INTEGER" name="featured" />
</property>

But neither of these worked; I received the same error.

I took a step back and looked at the bean.

Integer featured;

public Integer getFeatured() {
return featured;
}
public void setFeatured(Integer featured) {
this.featured = featured;
}

...

and realized that I had added a convenience method that was confusing the Hibernate code:

public boolean isFeatured() {
return ...
}

When I changed the signature of the convenience method to:

public boolean isFeaturedListing() {
return ...
}

the exception went away.  Thought I'd share for anyone searching for this stacktrace.

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One thought on “Hibernate Boolean/Integer ClassCastException

  1. Karamjeet says:

    Wow we just ran into this error again!

    I was seeing this error intermittently, while on a Java 1.7 box and Dan was NEVER seeing this error running the SAME code on a Java 1.6 box.

    After Dan upgraded to Java 1.7 he started seeing the error.

    Not sure what changes in Java made this show up.

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