Map实体从外部jar或外部类路径动态加载

Question

我需要映射未在hibernate.cfg.xml中列出的实体，这些类从仲裁文件夹动态加载 。我试图注册一个ClassLoaderService来改变加载行为， 下面的代码运行良好，如果类在编译时定义并存在于类路径中，但如果我试图映射一个dinamically加载的类，我得到ClassNotFoundException。有关于同一问题的一些问题，但我没有找到任何工作解决方案。

URL file = ConsultaBase.class.getProtectionDomain().getCodeSource().getLocation().toURI().resolve("implementacao/").resolve("hibernate.cfg.xml").toURL(); 
Configuration configuration = new Configuration() 
    .addAnnotatedClass(Registro.class).configure(file);   

ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder (
    new BootstrapServiceRegistryImpl(
     new ClassLoaderServicePirilampo(Registro.class.getClassLoader()), 
     new LinkedHashSet<Integrator>() 
    ) 
) 
.applySettings(configuration.getProperties()) 
.addService(ClassLoaderService.class, new ClassLoaderServicePirilampo()) 
.build(); 

//this line throws ClassNotFoundException 
sessionFactory = configuration.buildSessionFactory(serviceRegistry);  

我延长了ClassLoaderServiceImpl才能登录请求的类，并注意到从JUnit的运行，从那里类中定义的项目，它工作得很好，我从服务类加载日志。但是，如果我添加了已加载的消息（来自GroovyClassLoader），则该服务从不会收到对同一类的请求 。

最后一行抛出去如下因素的错误：

17:06:49 ERROR [AssertionFailure] HHH000099: an assertion failure occured (this may indicate a bug in Hibernate, but is more likely due to unsafe use of the session): java.lang.ClassNotFoundException: implementacao.Registro 
PersistentClass name cannot be converted into a Class 
org.hibernate.AssertionFailure: PersistentClass name cannot be converted into a Class 
    at org.hibernate.cfg.BinderHelper.getPropertyOverriddenByMapperOrMapsId(BinderHelper.java:817) 
    at org.hibernate.cfg.AnnotationBinder.processElementAnnotations(AnnotationBinder.java:2169) 
    at org.hibernate.cfg.AnnotationBinder.processIdPropertiesIfNotAlready(AnnotationBinder.java:963) 
    at org.hibernate.cfg.AnnotationBinder.bindClass(AnnotationBinder.java:796) 
    at org.hibernate.cfg.Configuration$MetadataSourceQueue.processAnnotatedClassesQueue(Configuration.java:3788) 
    at org.hibernate.cfg.Configuration$MetadataSourceQueue.processMetadata(Configuration.java:3742) 
    at org.hibernate.cfg.Configuration.secondPassCompile(Configuration.java:1410) 
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1844) 
    at implementacao.ConsultaBase.createSessionFactory(ConsultaBase.java:64) 
    at implementacao.ConsultaBase.consultar(ConsultaBase.java:92) 
    at implementacao.ConsultaBase$consultar.call(Unknown Source) 
    at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:45) 
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:108) 
    at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:112) 
    at ConsultaBaseConector.run(ConsultaBaseConector.groovy:6) 
    at groovy.util.GroovyScriptEngine.run(GroovyScriptEngine.java:551) 
    at br.org.fplf.processo.maquinaexecucao.parser.ParserAtividadeAutomatica.executar(ParserAtividadeAutomatica.java:43) 
    at br.org.fplf.processo.maquinaexecucao.MaquinaExecucao.executarAtividadeAutomatica(MaquinaExecucao.java:1050) 
    at br.org.fplf.processo.maquinaexecucao.MaquinaExecucao.executarAtividadeFluxo(MaquinaExecucao.java:973) 
    at br.org.fplf.processo.maquinaexecucao.MaquinaExecucao.executar(MaquinaExecucao.java:646) 
    at br.org.fplf.processo.maquinaexecucao.MaquinaExecucao.run(MaquinaExecucao.java:368) 
Caused by: java.lang.ClassNotFoundException: implementacao.Registro 
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1702) 
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547) 
    at java.lang.Class.forName0(Native Method) 
    at java.lang.Class.forName(Unknown Source) 
    at org.hibernate.annotations.common.util.ReflectHelper.classForName(ReflectHelper.java:60) 
    at org.hibernate.annotations.common.reflection.java.JavaReflectionManager.classForName(JavaReflectionManager.java:138) 
    at org.hibernate.cfg.BinderHelper.getPropertyOverriddenByMapperOrMapsId(BinderHelper.java:813) 
    ... 20 more 

Answer 1

这为我工作：

Thread.currentThread().setContextClassLoader(DynamicallyLoadedClass.getClassLoader());  

例如：

URL file = ConsultaBase.class.getProtectionDomain().getCodeSource().getLocation() 
    .toURI().resolve("hibernate.cfg.xml").toURL(); 

Configuration configuration = new Configuration() 
    .addAnnotatedClass(Registro.class).configure(file);   

ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder() 
    .applySettings(configuration.getProperties()) 
    .build(); 

Thread.currentThread().setContextClassLoader(Registro.class.getClassLoader()); 

sessionFactory = configuration.buildSessionFactory(serviceRegistry);