Hello, Im working with SEAM 1.2.1 and I have two datasources: one is from a
Postgres database (and works fine) and the other one is for a MySQL database
('WP7Datasource', which doesn't work).
The problem is that when I start JBoss i get this error:
16:58:20,968 INFO [SessionFactoryImpl] building session factory
17:08:39,718 WARN [ServiceController] Problem starting service
persistence.units:ear=medieq-aqua.ear,jar=medieq-aqua.jar,unitName=WP7Datasource
javax.persistence.PersistenceException: org.hibernate.MappingException: could
not instantiate id generator
at
org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:695)
at
org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:127)
at
org.jboss.ejb3.entity.PersistenceUnitDeployment.start(PersistenceUnitDeployment.java:264)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
...
Caused by: org.hibernate.MappingException: could not instantiate id generator
at
org.hibernate.id.IdentifierGeneratorFactory.create(IdentifierGeneratorFactory.java:98)
at
org.hibernate.mapping.SimpleValue.createIdentifierGenerator(SimpleValue.java:152)
at org.hibernate.impl.SessionFactoryImpl.(SessionFactoryImpl.java:192)
at
org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1218)
at
org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:688)
... 147 more
Caused by: org.hibernate.MappingException: Dialect does not support sequences
at
org.hibernate.dialect.Dialect.getSequenceNextValString(Dialect.java:570)
at
org.hibernate.id.SequenceGenerator.configure(SequenceGenerator.java:65)
at
org.hibernate.id.SequenceHiLoGenerator.configure(SequenceHiLoGenerator.java:43)
at
org.hibernate.id.IdentifierGeneratorFactory.create(IdentifierGeneratorFactory.java:94)
....
the datasources are defined here:
<?xml version="1.0" encoding="UTF-8"?>
| <datasources>
| <local-tx-datasource>
| <jndi-name>medieqDatasource</jndi-name>
| <connection-url>
| jdbc:postgresql://localhost:5432/medieqdev
| </connection-url>
| <driver-class>org.postgresql.Driver</driver-class>
| <user-name>****</user-name>
| <password>****</password>
| <connection-property name="char.encoding">
| UTF-8
| </connection-property>
| <transaction-isolation>
| TRANSACTION_READ_COMMITTED
| </transaction-isolation>
| <min-pool-size>25</min-pool-size>
| <max-pool-size>100</max-pool-size>
| <blocking-timeout-millis>5000</blocking-timeout-millis>
| <idle-timeout-minutes>15</idle-timeout-minutes>
| <prepared-statement-cache-size>
| 75
| </prepared-statement-cache-size>
| </local-tx-datasource>
|
| <!-- add datasource for UMLS MYSQL database (Manuel Fidalgo)-->
| <local-tx-datasource>
| <jndi-name>WP7Datasource</jndi-name>
| <connection-url>jdbc:mysql://localhost/umls</connection-url>
| <driver-class>com.mysql.jdbc.Driver</driver-class>
| <user-name>***</user-name>
| <password>***</password>
| <connection-property name="char.encoding">UTF-8</connection-property>
|
<transaction-isolation>TRANSACTION_READ_COMMITTED</transaction-isolation>
| <min-pool-size>25</min-pool-size>
| <max-pool-size>100</max-pool-size>
| <blocking-timeout-millis>5000</blocking-timeout-millis>
| <idle-timeout-minutes>15</idle-timeout-minutes>
| <prepared-statement-cache-size>75</prepared-statement-cache-size>
| <metadata> <type-mapping>mySQL</type-mapping></metadata>
| </local-tx-datasource>
| </datasources>
and the persistence.xml is this:
<persistence>
| <persistence-unit name="medieqDatasource">
| <provider>org.hibernate.ejb.HibernatePersistence</provider>
| <jta-data-source>java:/medieqDatasource</jta-data-source>
| <properties>
| <!-- create-drop -->
| <property name="hibernate.hbm2ddl.auto" value="validate"/>
| <property name="hibernate.show_sql" value="true"/>
| <!-- These are the default for JBoss EJB3, but not for HEM: /-->
| <property name="hibernate.cache.provider_class"
value="org.hibernate.cache.HashtableCacheProvider"/>
| <property name="hibernate.transaction.manager_lookup_class"
value="org.hibernate.transaction.JBossTransactionManagerLookup"/>
| <property name="jboss.entity.manager.factory.jndi.name"
value="java:/medieqEntityManagerFactory"/>
| </properties>
| </persistence-unit>
|
| <!-- MySQL UMLS database Manuel Fidalgo -->
| <persistence-unit name="WP7Datasource">
| <provider>org.hibernate.ejb.HibernatePersistence</provider>
| <jta-data-source>java:/WP7Datasource</jta-data-source>
| <properties>
| <property name="hibernate.hbm2ddl.auto"
value="validate" />
| <property name="hibernate.cache.use_query_cache"
value="true" />
| <property name="hibernate.show_sql" value="true" />
| <property name="hibernate.dialect"
value="org.hibernate.dialect.MySQL5Dialect" />
| <property name="hibernate.connection.username"
value="***" />
| <property name="hibernate.connection.password"
value="***" />
| <property name="hibernate.connection.driver_class"
value="com.mysql.jdbc.Driver" />
| <property name="hibernate.connection.url"
value="jdbc:mysql://localhost/umls" />
| <property name="jboss.entity.manager.factory.jndi.name"
value="java:/WP7EntityManagerFactory" />
| <property name="hibernate.jdbc.use_get_generated_keys"
value="false" />
| </properties>
| </persistence-unit>
| </persistence>
Both databases are working and I can connect to them via JDBC. I have no
entities for the MySQL database but is should work...I think that the problem
is that the configuration forces MySQL to use id generators and it doesnt work
but I don't know why it uses this generators and if I could turn off this
feature (only for MySQL)... Any help will be apreciated...
thanks
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