title: Failover @Type for h2?
body: <p>I have to do the <code>@Type</code> for PostgreSQL, to get it's native UUID type, but this caused query problems with H2</p>
  
  <pre><code>@Id
  @Override
  @Type(type = "pg-uuid")
  @GeneratedValue(generator = "uuid2")
  @GenericGenerator(name = "uuid2", strategy = "uuid2")
  @Column(name = "task_id", columnDefinition = "uuid")
  public UUID getId() {
      return id;
  }
  </code></pre>
  
  <p>here's the cause of the exception:</p>
  
  <pre class="lang-none prettyprint-override"><code>org.h2.jdbc.JdbcSQLException: Hexadecimal string contains non-hex character: "aced0005-7372-000e-74c2-aa3c957d4f00"; SQL statement: select character0_.task_id as task_id1_0_0_, character0_.name as name2_0_0_ from characters character0_ where character0_.task_id=? 
  </code></pre>
  
  <p>What can I do to get the best of both world and have the same entity for H2 and PostgreSQL?</p>
  
  <pre class="lang-none prettyprint-override"><code>org.springframework.orm.jpa.JpaSystemException: could not extract ResultSet; nested exception is org.hibernate.exception.GenericJDBCException: could not extract ResultSet
      at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:244)
      at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:155)
      at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.translateExceptionIfPossible(AbstractEntityManagerFactoryBean.java:417)
      at org.springframework.dao.support.ChainedPersistenceExceptionTranslator.translateExceptionIfPossible(ChainedPersistenceExceptionTranslator.java:59)
      at org.springframework.dao.support.DataAccessUtils.translateIfNecessary(DataAccessUtils.java:213)
      at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:147)
      at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
      at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodIntercceptor.invoke(CrudMethodMetadataPostProcessor.java:111)
      at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
      at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:92)
      at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
      at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:207)
      at com.sun.proxy.$Proxy67.findOne(Unknown Source)
      at com.xenoterracide.rpf.model.CharacterRepoTest.save(CharacterRepoTest.java:36)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47)
      at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
      at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44)
      at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
      at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:74)
      at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:83)
      at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:72)
      at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:233)
      at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:87)
      at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238)
      at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63)
      at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236)
      at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53)
      at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229)
      at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61)
      at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:71)
      at org.junit.runners.ParentRunner.run(ParentRunner.java:309)
      at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:176)
      at org.junit.runner.JUnitCore.run(JUnitCore.java:160)
      at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:67)
  Caused by: org.hibernate.exception.GenericJDBCException: could not extract ResultSet
      at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:54)
      at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:126)
      at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:112)
      at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:91)
      at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.getResultSet(AbstractLoadPlanBasedLoader.java:449)
      at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeQueryStatement(AbstractLoadPlanBasedLoader.java:202)
      at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:137)
      at org.hibernate.loader.plan.exec.internal.AbstractLoadPlanBasedLoader.executeLoad(AbstractLoadPlanBasedLoader.java:102)
      at org.hibernate.loader.entity.plan.AbstractLoadPlanBasedEntityLoader.load(AbstractLoadPlanBasedEntityLoader.java:186)
      at org.hibernate.persister.entity.AbstractEntityPersister.load(AbstractEntityPersister.java:4126)
      at org.hibernate.event.internal.DefaultLoadEventListener.loadFromDatasource(DefaultLoadEventListener.java:503)
      at org.hibernate.event.internal.DefaultLoadEventListener.doLoad(DefaultLoadEventListener.java:468)
      at org.hibernate.event.internal.DefaultLoadEventListener.load(DefaultLoadEventListener.java:213)
      at org.hibernate.event.internal.DefaultLoadEventListener.proxyOrLoad(DefaultLoadEventListener.java:275)
      at org.hibernate.event.internal.DefaultLoadEventListener.onLoad(DefaultLoadEventListener.java:151)
      at org.hibernate.internal.SessionImpl.fireLoad(SessionImpl.java:1070)
      at org.hibernate.internal.SessionImpl.access$2000(SessionImpl.java:176)
      at org.hibernate.internal.SessionImpl$IdentifierLoadAccessImpl.load(SessionImpl.java:2551)
      at org.hibernate.internal.SessionImpl.get(SessionImpl.java:955)
      at org.hibernate.jpa.spi.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:1110)
      at org.hibernate.jpa.spi.AbstractEntityManagerImpl.find(AbstractEntityManagerImpl.java:1074)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at org.springframework.orm.jpa.SharedEntityManagerCreator$SharedEntityManagerInvocationHandler.invoke(SharedEntityManagerCreator.java:289)
      at com.sun.proxy.$Proxy65.find(Unknown Source)
      at org.springframework.data.jpa.repository.support.SimpleJpaRepository.findOne(SimpleJpaRepository.java:222)
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.executeMethodOn(RepositoryFactorySupport.java:405)
      at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.doInvoke(RepositoryFactorySupport.java:390)
      at org.springframework.data.repository.core.support.RepositoryFactorySupport$QueryExecutorMethodInterceptor.invoke(RepositoryFactorySupport.java:344)
      at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
      at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:98)
      at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:262)
      at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:95)
      at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
      at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
      ... 34 more
  Caused by: org.h2.jdbc.JdbcSQLException: Hexadecimal string contains non-hex character: "aced0005-7372-000e-74c2-aa3c957d4f00"; SQL statement:
  select character0_.task_id as task_id1_0_0_, character0_.name as name2_0_0_ from characters character0_ where character0_.task_id=? [90004-176]
      at org.h2.message.DbException.getJdbcSQLException(DbException.java:344)
      at org.h2.message.DbException.get(DbException.java:178)
      at org.h2.message.DbException.get(DbException.java:154)
      at org.h2.util.StringUtils.convertHexToBytes(StringUtils.java:966)
      at org.h2.value.Value.convertTo(Value.java:867)
      at org.h2.table.Table.compareTypeSave(Table.java:1086)
      at org.h2.index.BaseIndex.compareValues(BaseIndex.java:319)
      at org.h2.index.BaseIndex.compareRows(BaseIndex.java:250)
      at org.h2.index.TreeIndex.findFirstNode(TreeIndex.java:277)
      at org.h2.index.TreeIndex.find(TreeIndex.java:317)
      at org.h2.index.TreeIndex.find(TreeIndex.java:297)
      at org.h2.index.IndexCursor.find(IndexCursor.java:160)
      at org.h2.table.TableFilter.next(TableFilter.java:330)
      at org.h2.command.dml.Select.queryFlat(Select.java:533)
      at org.h2.command.dml.Select.queryWithoutCache(Select.java:646)
      at org.h2.command.dml.Query.query(Query.java:323)
      at org.h2.command.dml.Query.query(Query.java:291)
      at org.h2.command.dml.Query.query(Query.java:37)
      at org.h2.command.CommandContainer.query(CommandContainer.java:91)
      at org.h2.command.Command.executeQuery(Command.java:197)
      at org.h2.jdbc.JdbcPreparedStatement.executeQuery(JdbcPreparedStatement.java:109)
      at org.hibernate.engine.jdbc.internal.ResultSetReturnImpl.extract(ResultSetReturnImpl.java:82)
  </code></pre>