We are facing the same issue.

There is someting in JPA 2.0 that could be used (https://docs.jboss.org/hibernate/jpa/2.1/api/javax/persistence/Query.html#setParameter%28javax.persistence.Parameter,%20T%29) :

setParameter(Parameter<T> param, T value)
Bind the value of a Parameter object.

The definition of Parameter<T> (https://docs.jboss.org/hibernate/jpa/2.1/api/javax/persistence/Parameter.html) is

java.lang.String getName()
Return the parameter name, or null if the parameter is not a named parameter or no name has been assigned.

java.lang.Class<T> getParameterType()
Return the Java type of the parameter.

java.lang.Integer getPosition()
Return the parameter position, or null if the parameter is not a positional parameter.

Unfortunettly Hibernate 4.3 use getPosition() and getName() but getClass() is never used.

The best way to declare class type should be using setParameter.