如何設置Mule JPA模塊以使用Hibernate JPA實現？

Question

我想安裝Mule來使用Mule JPA模塊（http://mulesoft.github.io/mule-module-jpa/mule/jpa.html），但我遇到依賴問題。

我已經通過Mule Studio添加了JPA模塊，它爲我設置了maven依賴關係。我還將hibernate-entitymanager依賴添加到我的pom中以提供JPA實現。我已經添加了與Mule運行時中包含的hibernate-core版本相同的3.6.0版本。然而，當我嘗試啓動騾子應用程序，我得到以下堆棧跟蹤：

INFO 2013-08-30 09:33:20,428 [main] org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean: Building JPA container EntityManagerFactory for persistence unit 'org.jembi.openhim.jpa' 
INFO 2013-08-30 09:33:20,525 [main] org.hibernate.annotations.common.Version: Hibernate Commons Annotations 3.2.0.Final 
INFO 2013-08-30 09:33:20,530 [main] org.hibernate.cfg.Environment: Hibernate 3.6.0.Final 
INFO 2013-08-30 09:33:20,531 [main] org.hibernate.cfg.Environment: hibernate.properties not found 
INFO 2013-08-30 09:33:20,533 [main] org.hibernate.cfg.Environment: Bytecode provider name : javassist 
INFO 2013-08-30 09:33:20,536 [main] org.hibernate.cfg.Environment: using JDK 1.4 java.sql.Timestamp handling 
INFO 2013-08-30 09:33:20,594 [main] org.hibernate.ejb.Version: Hibernate EntityManager 3.6.0.Final 
ERROR 2013-08-30 09:33:20,609 [main] org.mule.module.launcher.application.DefaultMuleApplication: null 
java.lang.IllegalAccessError: tried to access method org.hibernate.engine.CascadeStyle.<init>()V from class org.hibernate.engine.EJB3CascadeStyle$1 
    at org.hibernate.engine.EJB3CascadeStyle$1.<init>(EJB3CascadeStyle.java:44) 
    at org.hibernate.engine.EJB3CascadeStyle.<clinit>(EJB3CascadeStyle.java:39) 
    at org.hibernate.ejb.event.EJB3PersistEventListener.<clinit>(EJB3PersistEventListener.java:39) 
    at org.hibernate.ejb.EventListenerConfigurator.<init>(EventListenerConfigurator.java:101) 
    at org.hibernate.ejb.Ejb3Configuration.<init>(Ejb3Configuration.java:159) 
    at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:72) 
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:288) 
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:310) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1545) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1483) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:524) 
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:461) 
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:295) 
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223) 
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:292) 
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194) 
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1117) 
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:922) 
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479) 
    at org.mule.config.spring.SpringRegistry.doInitialise(SpringRegistry.java:89) 
    at org.mule.registry.AbstractRegistry.initialise(AbstractRegistry.java:109) 
    at org.mule.config.spring.SpringXmlConfigurationBuilder.createSpringRegistry(SpringXmlConfigurationBuilder.java:119) 
    at org.mule.config.spring.SpringXmlConfigurationBuilder.doConfigure(SpringXmlConfigurationBuilder.java:73) 
    at org.mule.config.builders.AbstractConfigurationBuilder.configure(AbstractConfigurationBuilder.java:46) 
    at org.mule.config.builders.AbstractResourceConfigurationBuilder.configure(AbstractResourceConfigurationBuilder.java:78) 
    at org.mule.config.builders.AutoConfigurationBuilder.autoConfigure(AutoConfigurationBuilder.java:101) 
    at org.mule.config.builders.AutoConfigurationBuilder.doConfigure(AutoConfigurationBuilder.java:57) 
    at org.mule.config.builders.AbstractConfigurationBuilder.configure(AbstractConfigurationBuilder.java:46) 
    at org.mule.config.builders.AbstractResourceConfigurationBuilder.configure(AbstractResourceConfigurationBuilder.java:78) 
    at org.mule.context.DefaultMuleContextFactory.createMuleContext(DefaultMuleContextFactory.java:84) 
    at org.mule.module.launcher.application.DefaultMuleApplication.init(DefaultMuleApplication.java:207) 
    at org.mule.module.launcher.application.ApplicationWrapper.init(ApplicationWrapper.java:64) 
    at org.mule.module.launcher.DefaultMuleDeployer.deploy(DefaultMuleDeployer.java:47) 
    at org.mule.tooling.server.application.ApplicationDeployer.run(ApplicationDeployer.java:58) 
    at org.mule.tooling.server.application.ApplicationDeployer.main(ApplicationDeployer.java:91) 

它似乎有一個版本不匹配或東西，是造成這一點，但我想不出爲什麼。我使用與hibernate核心相同的實體管理器版本。任何想法我可以嘗試？

Answer 1

$ {MULE_HOME}/lib/opt中的Mule分佈包含Hibernate核心jar，但它沒有Hibernate Entity Manager jar。如果你的類路徑中包含了相同的jar，它會嘗試從/ lib/opt jar中訪問hibernate的核心類，但是它會給出一個IllegalAccessError，因爲它已經被diff類加載器加載了。因此，嘗試從/ lib/opt文件夾中刪除由Mule提供的Hibernate jar，並通過您爲項目使用的任何方式添加您自己的[build path or pom等]。

我想它應該工作。

-Shanky G.