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 Post subject: MySQL schema issue when migrating Hibernate 4 to 5
PostPosted: Thu Sep 29, 2016 8:54 am 

Joined: Thu Sep 29, 2016 8:51 am
Posts: 2

we have just upgraded from WildFly 9 to 10 and therefore also upgraded from Hibernate 4 to 5.
Our application uses entities that are derived from a abstract super entity that has a generated id field.
The super class looks like this:

@SqlResultSetMapping(name = EntityId.rsmId,
   columns = { @ColumnResult(name = "id", type = Long.class) })
public abstract class EntityId
   @GeneratedValue(strategy = GenerationType.TABLE, generator = "generator1")
   @TableGenerator(name = "generator1",
      pkColumnValue = "g1",
      initialValue = 0, allocationSize = 1000,
      schema = "schema2", table = "sysidgenerator", // MySQL
      pkColumnName = "gen_key", valueColumnName = "gen_val")
   @Column(name = "id")
   private Long id;

and our datasource is configured like this:

<xa-datasource jndi-name="java:jboss/datasources/MTDS" pool-name="MTDS" enabled="true" use-ccm="false">
   <xa-datasource-property name="URL">
      <valid-connection-checker class-name="org.jboss.jca.adapters.jdbc.extensions.mysql.MySQLValidConnectionChecker"/>
      <exception-sorter class-name="org.jboss.jca.adapters.jdbc.extensions.mysql.MySQLExceptionSorter"/>

With Hibernate 4 everything worked perfect. After the upgrade we get the following error:

ERROR [x.y.z] (default task-13) Caught exception.: javax.ejb.EJBTransactionRolledbackException: org.hibernate.HibernateException: Could not apply work
Caused by: org.hibernate.HibernateException: Unable to perform isolated work
   at org.hibernate.resource.transaction.backend.jta.internal.JtaIsolationDelegate.doTheWork(JtaIsolationDelegate.java:139)
   at org.hibernate.resource.transaction.backend.jta.internal.JtaIsolationDelegate.doTheWorkInNewTransaction(JtaIsolationDelegate.java:100)
   ... 253 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'schema.sysidgenerator' doesn't exist
   at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
   at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
   at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
   at java.lang.reflect.Constructor.newInstance(Unknown Source)
   at com.mysql.jdbc.Util.handleNewInstance(Util.java:409)
   at com.mysql.jdbc.Util.getInstance(Util.java:384)
   at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1052)
   at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4232)
   at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:4164)
   at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2615)
   at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2776)
   at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2838)
   at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2082)
   at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2212)
   at com.mysql.jdbc.jdbc2.optional.PreparedStatementWrapper.executeQuery(PreparedStatementWrapper.java:844)
   at org.jboss.jca.adapters.jdbc.WrappedPreparedStatement.executeQuery(WrappedPreparedStatement.java:504)
   at org.hibernate.id.enhanced.TableGenerator.executeQuery(TableGenerator.java:639)
   at org.hibernate.id.enhanced.TableGenerator.access$400(TableGenerator.java:127)
   at org.hibernate.id.enhanced.TableGenerator$1$1.execute(TableGenerator.java:541)
   at org.hibernate.id.enhanced.TableGenerator$1$1.execute(TableGenerator.java:531)
   at org.hibernate.jdbc.WorkExecutor.executeReturningWork(WorkExecutor.java:55)
   at org.hibernate.jdbc.AbstractReturningWork.accept(AbstractReturningWork.java:34)
   at org.hibernate.resource.transaction.backend.jta.internal.JtaIsolationDelegate.doTheWork(JtaIsolationDelegate.java:133)
   ... 254 more

For some reason Hibernate is now looking for the table 'schema.sysidgenerator' and not for 'schema2.sysidgenerator' like it is configured in the @TableGenerator.

What do we have to do to fix this?
Suggestions appreciated.


 Post subject: Re: Missing table after Hibernate Upgrade
PostPosted: Thu Sep 29, 2016 9:28 am 
Hibernate Team
Hibernate Team

Joined: Thu Sep 11, 2014 2:50 am
Posts: 1638
Location: Romania
I think that HHH-10408 is what you are talking about here.

There are more details in HHH-9714:

MySQL/MariaDB do not support schemas, they support catalogs. I know it is confusing because the command line lets you say CREATE SCHEMA, but their docs are very clear that this is just a "synonym" for CREATE DATABASE. And the JDBC driver only supports catalogs. In fact their DatabaseMetaData returns false for all {{#supportsSchemasIn?} methods, and true for {{#supportsCatalogsIn?).

This may have been a change from older versions of Hibernate. TBH our support for catalogs and schemas (especially in schema tooling) had been dubious.
Anyway, we tested your test against MySQL using default_catalog instead, and it works.

If you liked my answer, you are going to love my High-Performance Java Persistence book and my blog as well.

 Post subject: Re: MySQL schema issue when migrating Hibernate 4 to 5
PostPosted: Fri Sep 30, 2016 2:37 am 

Joined: Thu Sep 29, 2016 8:51 am
Posts: 2
Thank you very much!!!
That solved my problem.

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