Question

我设法使用多个数据源配置JPA，但是在启动我的服务器时出现以下错误（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)

如果所有DAO都在同一个数据库中声明，则应用程序会正确部署，但如果将其中的任何一个移动到第二个数据库，则会失败。是否可以使用具有多个数据源的JPA包（OneToOne，ManyToOne，ManyToMany）？

配置的相关部分：

上下文

<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>

的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中

<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>

的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

我知道为时已晚，但是我遇到了同样的问题。我正在使用Oracle数据库，具有两个模式（用户）的同一数据库我的解决方案是让第一用户访问第二用户架构中的所有表。之后，在“ JPA实体”批注上，为每个实体调整模式。

通过这种方式，hibernate使用schema生成SQL查询：

select field1, field2 from USER1.Table1 INNER JOIN USER2.TABLE2 ON .....

之所以这样工作是因为user1可以通过授权访问user2表，但是两个模式必须位于同一数据库中，否则您必须创建dblink和同义词。

将OneToOne / ManyToOne与JPA和多个数据源一起使用时出错

1 个答案: