JPA和OSGI项目上的ClassNotFound错误

问题描述 投票：3回答：1

我在OSGI环境下对JPA遇到问题。

有关环境和框架的一些信息：

  • 运行环境是karaf 4.1.6。
  • org.hibernate.osgi版本5.2.9.Final。
  • hibernate-jpa-2.1-api
  • org.apache.aries.jpa.container版本2.6.1

在我的项目中，（几乎）同一实体类上需要两个不同的持久性单元，因为我需要用两个不同的Oracle模式编写。

所以我有两个这样的数据源（具有不同的参数）：

<blueprint xmlns="http://www.osgi.org/xmlns/blueprint/v1.0.0">      


    <bean id="oraDataSource" class="org.apache.commons.dbcp2.BasicDataSource" destroy-method="close">
        <property name="driverClassName" value="oracle.jdbc.OracleDriver" />
        <property name="url" value="jdbc:oracle:thin:@******" />
        <property name="username" value="***" />
        <property name="password" value="***" />
        <property name="validationQuery" value="SELECT 1 FROM DUAL" />
        <property name="initialSize" value="5"/> 
        <property name="maxIdle" value="5"/>
        <property name="maxTotal" value="20"/>
    </bean>



    <service interface="javax.sql.DataSource" ref="oraDataSource">
        <service-properties>
            <entry key="osgi.jndi.service.name" value="jdbc/oraDataSource"/>
        </service-properties>
    </service>

这是简化的persistence.xml：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<persistence version="2.0"
             xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
             xmlns="http://java.sun.com/xml/ns/persistence"
             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

  <persistence-unit name="PU">
    <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
    <non-jta-data-source>osgi:service/javax.sql.DataSource/(osgi.jndi.service.name=jdbc/oraDataSource)</non-jta-data-source>
    <!-- orm class -->
    .....
    <class>my.path.jpa.model.Pratica</class>
    <class>my.path.jpa.model.Tag</class>
    ......
    <exclude-unlisted-classes>true</exclude-unlisted-classes>
    <properties>
      <property name="hibernate.dialect" value="org.hibernate.dialect.Oracle12cDialect"/>
      <property name="hibernate.jdbc.use_streams_for_binary" value="false"/>
      <!--<property name="hibernate.show_sql" value="true"/>-->
      <property name="hibernate.hbm2ddl.auto" value="validate"/>
    </properties>
  </persistence-unit>


  <persistence-unit name="SYM-PU">
    <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
    <non-jta-data-source>osgi:service/javax.sql.DataSource/(osgi.jndi.service.name=jdbc/symOraDataSource)</non-jta-data-source>
    <!-- orm class -->
    .....
    <class>my.path.jpa.model.Pratica</class>
    <class>my.path.jpa.model.Tag</class>
    ......
    <class>my.path.jpa.model.sym.PraticaSym</class>
    <exclude-unlisted-classes>true</exclude-unlisted-classes>
    <properties>
      <property name="hibernate.dialect" value="org.hibernate.dialect.Oracle12cDialect"/>
      <property name="hibernate.jdbc.use_streams_for_binary" value="false"/>
      <!--<property name="hibernate.show_sql" value="true"/>-->
      <property name="hibernate.hbm2ddl.auto" value="validate"/>
    </properties>
  </persistence-unit>

</persistence>

这是我的felix插件配置：

<plugin>
    <groupId>org.apache.felix</groupId>
    <artifactId>maven-bundle-plugin</artifactId>
    <version>${maven.bundle.plugin.version}</version>
    <extensions>true</extensions>
    <configuration>
      <instructions>
        <Bundle-SymbolicName>${project.artifactId}</Bundle-SymbolicName>
        <Meta-Persistence>META-INF/persistence.xml</Meta-Persistence>
        <Export-Package>
          my.path.jpa*
        </Export-Package>
        <Import-Package>           
            org.hibernate.proxy, javassist.util.proxy, oracle.jdbc, *
        </Import-Package>
        <DynamicImport-Package>oracle.jdbc.driver</DynamicImport-Package>
      </instructions>
    </configuration>
  </plugin>

当我尝试安装包含此捆绑软件的功能时，出现以下错误仅第一次我尝试安装：

2019-10-07T18:50:19,315 | ERROR | CM Configuration Updater (ManagedService Update: pid=[org.apache.aries.jpa.SYM-PU]) | lix.cm.impl.ConfigurationManager 1284 | 9 - org.apache.felix.configadmin - 1.8.16 | [org.osgi.service.cm.ManagedService, id=2531, bundle=8564/mvn:org.apache.aries.jpa/org.apache.aries.jpa.container/2.6.1]: Unexpected problem updating configuration org.apache.aries.jpa.SYM-PU
org.hibernate.boot.registry.classloading.spi.ClassLoadingException: Unable to load class [my.path.jpa.model.Tag]
    at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:348) [8587:org.hibernate.core:5.2.9.Final]
    at org.hibernate.boot.model.source.internal.annotations.AnnotationMetadataSourceProcessorImpl.<init>(AnnotationMetadataSourceProcessorImpl.java:104) [8587:org.hibernate.core:5.2.9.Final]
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess$1.<init>(MetadataBuildingProcess.java:147) [8587:org.hibernate.core:5.2.9.Final]
    at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:141) [8587:org.hibernate.core:5.2.9.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.metadata(EntityManagerFactoryBuilderImpl.java:858) [8587:org.hibernate.core:5.2.9.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:885) [8587:org.hibernate.core:5.2.9.Final]
    at org.hibernate.osgi.OsgiPersistenceProvider.createContainerEntityManagerFactory(OsgiPersistenceProvider.java:96) [8589:org.hibernate.osgi:5.2.9.Final]
    at org.apache.aries.jpa.container.impl.ManagedEMF.createAndPublishEMF(ManagedEMF.java:129) [8564:org.apache.aries.jpa.container:2.6.1]
    at org.apache.aries.jpa.container.impl.ManagedEMF.updated(ManagedEMF.java:125) [8564:org.apache.aries.jpa.container:2.6.1]
    at org.apache.felix.cm.impl.helper.ManagedServiceTracker.updated(ManagedServiceTracker.java:189) [9:org.apache.felix.configadmin:1.8.16]
    at org.apache.felix.cm.impl.helper.ManagedServiceTracker.updateService(ManagedServiceTracker.java:152) [9:org.apache.felix.configadmin:1.8.16]
    at org.apache.felix.cm.impl.helper.ManagedServiceTracker.provideConfiguration(ManagedServiceTracker.java:85) [9:org.apache.felix.configadmin:1.8.16]
    at org.apache.felix.cm.impl.ConfigurationManager$ManagedServiceUpdate.provide(ConfigurationManager.java:1479) [9:org.apache.felix.configadmin:1.8.16]
    at org.apache.felix.cm.impl.ConfigurationManager$ManagedServiceUpdate.run(ConfigurationManager.java:1435) [9:org.apache.felix.configadmin:1.8.16]
    at org.apache.felix.cm.impl.UpdateThread.run0(UpdateThread.java:141) [9:org.apache.felix.configadmin:1.8.16]
    at org.apache.felix.cm.impl.UpdateThread.run(UpdateThread.java:109) [9:org.apache.felix.configadmin:1.8.16]
    at java.lang.Thread.run(Thread.java:748) [?:?]
Caused by: java.lang.ClassNotFoundException: Could not load requested class : my.path.jpa.model.Tag
    at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl$AggregatedClassLoader.findClass(ClassLoaderServiceImpl.java:336) ~[?:?]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:?]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:?]
    at java.lang.Class.forName0(Native Method) ~[?:?]
    at java.lang.Class.forName(Class.java:348) ~[?:?]
    at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:345) ~[?:?]
    ... 16 more

如果我重试安装该功能，一切正常！

问题始终在第二个持久性单元上。如果我尝试用第二个PU反转第一个，在persistence.xml中先声明SYM-PU而不是PU，则在PU上也会发生相同的问题。

谢谢您的回答。

java hibernate jpa osgi apache-karaf
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