./gradlew test --info
You will see the GroovyUserSpecification will be failed because of
Caused by: Exception [EclipseLink-3002] (Eclipse Persistence Services - 2.6.5.v20170607-b3d05bd): org.eclipse.persistence.exceptions.ConversionException
Exception Description: The object [Male], of class [class java.lang.String], from mapping [org.eclipse.persistence.mappings.DirectToFieldMapping[sex-->GROOVY_USER.SEX]] with descriptor [RelationalDescriptor(com.model.entity.GroovyUser --> [DatabaseTable(GROOVY_USER)])], could not be converted to [interface groovy.lang.GroovyObject].
at org.eclipse.persistence.exceptions.ConversionException.couldNotBeConverted(ConversionException.java:78)
at org.eclipse.persistence.internal.helper.ConversionManager.convertObject(ConversionManager.java:176)
at org.eclipse.persistence.internal.databaseaccess.DatasourcePlatform.convertObject(DatasourcePlatform.java:179)
at org.eclipse.persistence.mappings.foundation.AbstractDirectMapping.getFieldValue(AbstractDirectMapping.java:789)
at org.eclipse.persistence.mappings.foundation.AbstractDirectMapping.writeFromObjectIntoRow(AbstractDirectMapping.java:1292)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildRow(ObjectBuilder.java:1567)
at org.eclipse.persistence.internal.descriptors.ObjectBuilder.buildRow(ObjectBuilder.java:1555)
at org.eclipse.persistence.internal.queries.DatabaseQueryMechanism.insertObjectForWrite(DatabaseQueryMechanism.java:451)
at org.eclipse.persistence.queries.InsertObjectQuery.executeCommit(InsertObjectQuery.java:80)
at org.eclipse.persistence.queries.InsertObjectQuery.executeCommitWithChangeSet(InsertObjectQuery.java:90)
at org.eclipse.persistence.internal.queries.DatabaseQueryMechanism.executeWriteWithChangeSet(DatabaseQueryMechanism.java:301)
at org.eclipse.persistence.queries.WriteObjectQuery.executeDatabaseQuery(WriteObjectQuery.java:58)
at org.eclipse.persistence.queries.DatabaseQuery.execute(DatabaseQuery.java:911)
at org.eclipse.persistence.queries.DatabaseQuery.executeInUnitOfWork(DatabaseQuery.java:810)
at org.eclipse.persistence.queries.ObjectLevelModifyQuery.executeInUnitOfWorkObjectLevelModifyQuery(ObjectLevelModifyQuery.java:108)
at org.eclipse.persistence.queries.ObjectLevelModifyQuery.executeInUnitOfWork(ObjectLevelModifyQuery.java:85)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.internalExecuteQuery(UnitOfWorkImpl.java:2899)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1863)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1845)
at org.eclipse.persistence.internal.sessions.AbstractSession.executeQuery(AbstractSession.java:1796)
at org.eclipse.persistence.internal.sessions.CommitManager.commitNewObjectsForClassWithChangeSet(CommitManager.java:227)
at org.eclipse.persistence.internal.sessions.CommitManager.commitAllObjectsWithChangeSet(CommitManager.java:126)
at org.eclipse.persistence.internal.sessions.AbstractSession.writeAllObjectsWithChangeSet(AbstractSession.java:4279)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitToDatabase(UnitOfWorkImpl.java:1444)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitToDatabaseWithChangeSet(UnitOfWorkImpl.java:1534)
at org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork.commitRootUnitOfWork(RepeatableWriteUnitOfWork.java:278)
at org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.commitAndResume(UnitOfWorkImpl.java:1172)
at org.eclipse.persistence.internal.jpa.transaction.EntityTransactionImpl.commit(EntityTransactionImpl.java:134)
... 1 more