javax.persistence.PersistenceException: org.hibernate.MappingException: No Dialect mapping for JDBC type: -4
        at org.hibernate.ejb.AbstractEntityManagerImpl.throwPersistenceException(AbstractEntityManagerImpl.java:614)
        at org.hibernate.ejb.QueryImpl.getSingleResult(QueryImpl.java:128)
        at sms.smsat.delegate.ApontamentoDelegate.buscarPorNumero(ApontamentoDelegate.java:102)
        at sms.smsat.delegate.ApontamentoDelegateTest.testBuscarPorNumero(ApontamentoDelegateTest.java:25)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at org.junit.internal.runners.TestMethod.invoke(TestMethod.java:59)
        at org.junit.internal.runners.MethodRoadie.runTestMethod(MethodRoadie.java:98)
        at org.junit.internal.runners.MethodRoadie$2.run(MethodRoadie.java:79)
        at org.junit.internal.runners.MethodRoadie.runBeforesThenTestThenAfters(MethodRoadie.java:87)
        at org.junit.internal.runners.MethodRoadie.runTest(MethodRoadie.java:77)
        at org.junit.internal.runners.MethodRoadie.run(MethodRoadie.java:42)
        at org.junit.internal.runners.JUnit4ClassRunner.invokeTestMethod(JUnit4ClassRunner.java:88)
        at org.junit.internal.runners.JUnit4ClassRunner.runMethods(JUnit4ClassRunner.java:51)
        at org.junit.internal.runners.JUnit4ClassRunner$1.run(JUnit4ClassRunner.java:44)
        at org.junit.internal.runners.ClassRoadie.runUnprotected(ClassRoadie.java:27)
        at org.junit.internal.runners.ClassRoadie.runProtected(ClassRoadie.java:37)
        at org.junit.internal.runners.JUnit4ClassRunner.run(JUnit4ClassRunner.java:42)
        at junit.framework.JUnit4TestAdapter.run(JUnit4TestAdapter.java:36)
        at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.run(JUnitTestRunner.java:515)
        at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.launch(JUnitTestRunner.java:1031)
        at org.apache.tools.ant.taskdefs.optional.junit.JUnitTestRunner.main(JUnitTestRunner.java:888)
Caused by: org.hibernate.MappingException: No Dialect mapping for JDBC type: -4
        at org.hibernate.dialect.TypeNames.get(TypeNames.java:79)
        at org.hibernate.dialect.TypeNames.get(TypeNames.java:104)
        at org.hibernate.dialect.Dialect.getHibernateTypeName(Dialect.java:393)
        at org.hibernate.loader.custom.CustomLoader$Metadata.getHibernateType(CustomLoader.java:582)
        at org.hibernate.loader.custom.CustomLoader$ScalarResultColumnProcessor.performDiscovery(CustomLoader.java:508)
        at org.hibernate.loader.custom.CustomLoader.autoDiscoverTypes(CustomLoader.java:524)
        at org.hibernate.loader.Loader.getResultSet(Loader.java:1817)
        at org.hibernate.loader.Loader.doQuery(Loader.java:697)
        at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:259)
        at org.hibernate.loader.Loader.doList(Loader.java:2228)
        at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2125)
        at org.hibernate.loader.Loader.list(Loader.java:2120)
        at org.hibernate.loader.custom.CustomLoader.list(CustomLoader.java:312)
        at org.hibernate.impl.SessionImpl.listCustomQuery(SessionImpl.java:1722)
        at org.hibernate.impl.AbstractSessionImpl.list(AbstractSessionImpl.java:165)
        at org.hibernate.impl.SQLQueryImpl.list(SQLQueryImpl.java:175)
        at org.hibernate.ejb.QueryImpl.getSingleResult(QueryImpl.java:88)
        ... 22 more