Error using OneToOne/ManyToOne with JPA and Multiple Data Sources - spring

Question

I've managed to configure JPA with multiple datasources, but I get the following error when bringing up my server (Websphere liberty):
org.hibernate.AnnotationException: #OneToOne or #ManyToOne onxxx.AccountBalance.currency references an unknown entity: xxx.Currency
at org.hibernate.cfg.ToOneFkSecondPass.doSecondPass(T oOneFkSecondPass.java:109)
at org.hibernate.cfg.Configuration.processEndOfQueue( Configuration.java:1521)
at org.hibernate.cfg.Configuration.processFkSecondPas sInOrder(Configuration.java:1446)
at org.hibernate.cfg.Configuration.secondPassCompile( Configuration.java:1351)
at org.hibernate.cfg.Configuration.buildSessionFactor y(Configuration.java:1733)
at org.hibernate.ejb.EntityManagerFactoryImpl.<init>( EntityManagerFactoryImpl.java:94)
at org.hibernate.ejb.Ejb3Configuration.buildEntityMan agerFactory(Ejb3Configuration.java:905)
The application deploys correctly if all the DAO are declared in the same database, but it fails if I move any of them to a second database. Is it possible to used JPA bags (OneToOne, ManyToOne, ManyToMany) with multiple data sources?
Relevant parts of the configuration:
Context:
<jee:jndi-lookup id="dataSource" jndi-name="jdbc/xxxwas"
cache="true" resource-ref="true" lookup-on-startup="false"
proxy-interface="javax.sql.DataSource" />
<bean id="h2dataSource" class="org.apache.commons.dbcp.BasicDataSource"
destroy-method="close">
<property name="driverClassName" value="org.h2.Driver" />
<property name="url"
value="jdbc:h2:mem:test;DB_CLOSE_DELAY=-1;TRACE_LEVEL_SYSTEM_OUT=3" />
<property name="username" value="test" />
<property name="password" value="test" />
</bean>
<tx:jta-transaction-manager />
<bean id="persistenceUnitManager"
class="org.springframework.orm.jpa.persistenceunit .DefaultPersistenceUnitManager">
<property name="persistenceXmlLocations">
<list>
<value>classpath:META-INF/persistence.xml</value>
</list>
</property>
<property name="dataSources">
<map>
<entry key="h2" value-ref="h2dataSource" />
<entry key="mysql" value-ref="dataSource" />
</map>
</property>
<!-- if no datasource is specified, use this one -->
<property name="defaultDataSource" ref="dataSource" />
</bean>
<bean id="integrationEntityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerE ntityManagerFactoryBean">
<property name="persistenceUnitManager" ref="persistenceUnitManager" />
<property name="persistenceUnitName" value="integrationEntityManagerFactoryPU" />
<property name="jtaDataSource" ref="h2dataSource" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.Hibernat eJpaVendorAdapter">
<!-- <property name="showSql" value="true" /> -->
<property name="database" value="H2" />
<!-- <property name="generateDdl" value="true" /> -->
</bean>
</property>
<property name="jpaProperties">
<props>
<prop key="hibernate.hbm2ddl.auto">update</prop>
</props>
</property>
</bean>
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalContainerE ntityManagerFactoryBean">
<property name="persistenceUnitManager" ref="persistenceUnitManager" />
<property name="persistenceUnitName" value="databaseEntityManagerFactoryPU" />
<property name="jtaDataSource" ref="dataSource" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.Hibernat eJpaVendorAdapter">
<!-- <property name="showSql" value="true" /> -->
<property name="database" value="MYSQL" />
</bean>
</property>
</bean>
<jpa:repositories base-package="xxx.impl.repository.integration"
query-lookup-strategy="create-if-not-found"
entity-manager-factory-ref="integrationEntityManagerFactory">
</jpa:repositories>
<!-- Configures Spring Data JPA and sets the base package of my DAOs. -->
<jpa:repositories base-package="xxx.impl.repository"
query-lookup-strategy="create-if-not-found"
entity-manager-factory-ref="entityManagerFactory">
</jpa:repositories>
Server.xml
<dataSource id="xxxwas" jndiName="jdbc/xxxwas" supplementalJDBCTrace="true" type="javax.sql.XADataSource">
<jdbcDriver javax.sql.ConnectionPoolDataSource="com.mysql.jdbc.jdbc2.optional.MysqlConnectionPoolDataSource" javax.sql.DataSource="com.mysql.jdbc.jdbc2.optional.MysqlDataSource" javax.sql.XADataSource="com.mysql.jdbc.jdbc2.optional.MysqlXADataSource" libraryRef="MySQLLib"/>
<properties databaseName="xxx" password="xxx" portNumber="3306" serverName="localhost" user="root"/>
</dataSource>
Web.xml
<resource-ref>
<res-ref-name>jdbc/xxxwas</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
<res-sharing-scope>Shareable</res-sharing-scope>
</resource-ref>
Persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="databaseEntityManagerFactoryPU" transaction-type="JTA">
<class>xxx.impl.bo.AccountBalance</class>
<!-- WORKS IF DEFINED HERE -->
<!-- <class>xxx.impl.bo.Currency</class> -->
<properties>
<property name="hibernate.transaction.factory_class" value="org.hibernate.transaction.CMTTransactionFactory"/>
<property name="hibernate.transaction.manager_lookup_class" value="org.hibernate.transaction.WebSphereExtendedJTATransactionLookup" />
<!-- <property name="hibernate.current_session_context_class"value="thread" /> -->
<!--<prop key="hibernate.transaction.flush_before_completion">false</prop>-->
<!--<prop key="hibernate.transaction.auto_close_session">true</prop>-->
<!--<prop key="hibernate.current_session_context_class">thread</prop>-->
<!--<prop key="javax.persistence.transactionType">JTA</prop>-->
<!--<prop key="hibernate.connection.release_mode">auto</prop>-->
<property name="hibernate.cache.region.factory_class" value="org.hibernate.cache.ehcache.EhCacheRegionFactory"/>
<property name="hibernate.cache.use_query_cache" value="true"/>
<property name="hibernate.cache.use_second_level_cache" value="true"/>
<property name="net.sf.ehcache.configurationResourceName" value="ehcache_database.xml"/>
<property name="hibernate.cache.provider_class" value="net.sf.ehcache.hibernate.SingletonEhCacheProvider"/>
<!-- <property name="hibernate.archive.autodetection" value="class, hbm"/> -->
<!-- <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/> -->
<property name="hibernate.format_sql" value="true"/>
<property name="hibernate.ejb.naming_strategy" value="org.hibernate.cfg.DefaultNamingStrategy"/>
<property name="hibernate.use_sql_comments" value="true"/>
<property name="hibernate.generate_statistics" value="true"/>
</properties>
</persistence-unit>
<persistence-unit name="integrationEntityManagerFactoryPU" transaction-type="JTA">
<!-- DOES NOT WORK IF DEFINED HERE -->
<class>xxx.impl.bo.Currency</class>
<properties>
<property name="hibernate.transaction.factory_class" value="org.hibernate.transaction.CMTTransactionFactory"/>
<property name="hibernate.transaction.manager_lookup_class" value="org.hibernate.transaction.WebSphereExtendedJTATransactionLookup" />
<property name="hibernate.hbm2ddl.auto" value="create" />
</properties>
</persistence-unit>
</persistence>

Answer 1

I know its too late, but I had the same probleme.
I'm working on Oracle database, the same database with two schemas (users)
My solution was to give the first user access to all tables in the second user schema.
After that, on JPA Entity annotation, precise the schema for each entity.
This way, hibernate generate SQL queries with schema :
select field1, field2 from USER1.Table1 INNER JOIN USER2.TABLE2 ON .....
It work this way because user1 have access to user2 tables with a grant, but the two schemas must be in the same database, otherwise you have to create a dblink and a synonym.