When I declare a query with a literal parameter it thows an exception:
Caused by: org.hibernate.QueryException: AttributeConverter domain-model attribute type [org.hibernate.test.converter.literal.IntegerWrapper] did not match query literal type [java.lang.Integer]
at org.hibernate.hql.internal.ast.tree.LiteralNode.determineConvertedValue(LiteralNode.java:107)
at org.hibernate.hql.internal.ast.tree.LiteralNode.setExpectedType(LiteralNode.java:87)
at org.hibernate.hql.internal.ast.tree.BinaryLogicOperatorNode.initialize(BinaryLogicOperatorNode.java:62)
at org.hibernate.hql.internal.ast.HqlSqlWalker.prepareLogicOperator(HqlSqlWalker.java:1369)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.comparisonExpr(HqlSqlBaseWalker.java:4657)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.logicalExpr(HqlSqlBaseWalker.java:2130)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.logicalExpr(HqlSqlBaseWalker.java:2058)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.whereClause(HqlSqlBaseWalker.java:813)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:607)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:311)
at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:259)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:262)
at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:190)
... 21 more

As I see the literal parameter is the same type of the database type, so it doesn't need to be converted