我一直试图在工作中建立一个 EJB 项目来学习 Hibernate，但到目前为止我一直被这个错误所困扰。我已经尝试了几乎所有在 SO 或其他地方找到的解决方案，但都无济于事。该项目有一个 TimerBean，它从另一个使用 Hibernate 访问数据库并打印出存储值的 Bean 调用方法。我使用 JPA 从表中生成了实体类，并为生成的实体类手动编写了一个映射文件。以下是我项目中的相关文件:
hibernate .cfg.xml
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<!-- Database connection settings -->
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="connection.url">jdbc:mysql://localhost:3306/accountdb</property>
<property name="connection.username">root</property>
<property name="connection.password">pass</property>
<!-- Hibernate properties -->
<property name="show_sql">true</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hbm2ddl.auto">update</property>
<!-- Mapping Files -->
<mapping resource="com/gto/test/Account.hbm.xml"/>
</session-factory>
</hibernate-configuration>
persistence.xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1" xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="TestEJB3Project">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>com.gto.test.Account</class>
<class>com.gto.test.Accountaccesslog</class>
</persistence-unit>
AccountAccessBean.java
package com.gto.test;
import javax.ejb.LocalBean;
import javax.ejb.Stateless;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
@Stateless(mappedName = "AccountAccessBean")
@LocalBean
public class AccountAccessBean {
public void resigterAccountEvent() {
Configuration configuration = new Configuration().configure();
ServiceRegistry registry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
SessionFactory sessionFactory = configuration.buildSessionFactory(registry);
Session session = sessionFactory.openSession();
session.beginTransaction();
Account accountEntity = (Account) session.get(Account.class, new Integer(1));
System.out.println(accountEntity.getId());
}
}
Account.hbm.xml
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.gto.test">
<class name="Account" table="account">
<id name="id" column="id">
<generator class="increment" />
</id>
<property name="accessCount" column="accessCount"/>
</class>
</hibernate-mapping>
服务器日志
15:18:00,184 WARN [org.hibernate.orm.connections] (EJB default - 1) HHH10001002: Using Hibernate built-in connection pool (not for production use!)
15:18:00,184 ERROR [org.jboss.as.ejb3] (EJB default - 1) WFLYEJB0020: Error invoking timeout for timer: [id=e4f1edcd-d8cb-4f38-9a17-78df26ccc2ea timedObjectId=TestEJB3Project.TestEJB3Project.TimerBean auto-timer?:true persistent?:true timerService=org.jboss.as.ejb3.timerservice.TimerServiceImpl@15178ba initialExpiration=null intervalDuration(in milli sec)=0 nextExpiration=Wed Jul 27 15:18:30 IST 2016 timerState=IN_TIMEOUT info=Calls AccountAccessBean every 30 seconds]: javax.ejb.EJBException: org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]
at org.jboss.as.ejb3.tx.CMTTxInterceptor.handleExceptionInOurTx(CMTTxInterceptor.java:187)
at org.jboss.as.ejb3.tx.TimerCMTTxInterceptor.handleExceptionInOurTx(TimerCMTTxInterceptor.java:53)
at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:277)
at org.jboss.as.ejb3.tx.CMTTxInterceptor.required(CMTTxInterceptor.java:327)
at org.jboss.as.ejb3.tx.CMTTxInterceptor.processInvocation(CMTTxInterceptor.java:239)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
at org.jboss.as.ejb3.component.interceptors.CurrentInvocationContextInterceptor.processInvocation(CurrentInvocationContextInterceptor.java:41)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
at org.jboss.as.ejb3.security.SecurityContextInterceptor.processInvocation(SecurityContextInterceptor.java:100)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
at org.jboss.as.ejb3.component.interceptors.ShutDownInterceptorFactory$1.processInvocation(ShutDownInterceptorFactory.java:64)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
at org.jboss.as.ee.component.NamespaceContextInterceptor.processInvocation(NamespaceContextInterceptor.java:50)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
at org.jboss.as.ejb3.component.interceptors.AdditionalSetupInterceptor.processInvocation(AdditionalSetupInterceptor.java:54)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
at org.jboss.invocation.ContextClassLoaderInterceptor.processInvocation(ContextClassLoaderInterceptor.java:64)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
at org.jboss.invocation.InterceptorContext.run(InterceptorContext.java:356)
at org.wildfly.security.manager.WildFlySecurityManager.doChecked(WildFlySecurityManager.java:636)
at org.jboss.invocation.AccessCheckingInterceptor.processInvocation(AccessCheckingInterceptor.java:61)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
at org.jboss.invocation.InterceptorContext.run(InterceptorContext.java:356)
at org.jboss.invocation.PrivilegedWithCombinerInterceptor.processInvocation(PrivilegedWithCombinerInterceptor.java:80)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)
at org.jboss.as.ejb3.timerservice.TimedObjectInvokerImpl.callTimeout(TimedObjectInvokerImpl.java:99)
at org.jboss.as.ejb3.timerservice.CalendarTimerTask.invokeBeanMethod(CalendarTimerTask.java:64)
at org.jboss.as.ejb3.timerservice.CalendarTimerTask.callTimeout(CalendarTimerTask.java:53)
at org.jboss.as.ejb3.timerservice.TimerTask.run(TimerTask.java:155)
at org.jboss.as.ejb3.timerservice.TimerServiceImpl$Task$1.run(TimerServiceImpl.java:1214)
at org.wildfly.extension.requestcontroller.RequestController$QueuedTask$1.run(RequestController.java:497)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
at org.jboss.threads.JBossThread.run(JBossThread.java:320)
Caused by: org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]
at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:244)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:208)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:189)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:51)
at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:94)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:217)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:189)
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.handleTypes(MetadataBuildingProcess.java:352)
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:111)
at org.hibernate.boot.model.process.spi.MetadataBuildingProcess.build(MetadataBuildingProcess.java:83)
at org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:418)
at org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:87)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:692)
at com.gto.test.AccountAccessBean.resigterAccountEvent(AccountAccessBean.java:44)
at com.gto.test.TimerBean.scheduledTimeout(TimerBean.java:29)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.jboss.as.ee.component.ManagedReferenceMethodInterceptor.processInvocation(ManagedReferenceMethodInterceptor.java:52)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:57)
at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:61)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:437)
at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor.doMethodInterception(Jsr299BindingsInterceptor.java:82)
at org.jboss.as.weld.ejb.Jsr299BindingsInterceptor.processInvocation(Jsr299BindingsInterceptor.java:95)
at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:61)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
at org.jboss.invocation.WeavedInterceptor.processInvocation(WeavedInterceptor.java:57)
at org.jboss.as.ee.component.interceptors.UserInterceptorFactory$1.processInvocation(UserInterceptorFactory.java:61)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
at org.jboss.as.jpa.interceptor.SBInvocationInterceptor.processInvocation(SBInvocationInterceptor.java:47)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:437)
at org.jboss.weld.ejb.AbstractEJBRequestScopeActivationInterceptor.aroundInvoke(AbstractEJBRequestScopeActivationInterceptor.java:73)
at org.jboss.as.weld.ejb.EjbRequestScopeActivationInterceptor.processInvocation(EjbRequestScopeActivationInterceptor.java:83)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
at org.jboss.as.ee.concurrent.ConcurrentContextInterceptor.processInvocation(ConcurrentContextInterceptor.java:45)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
at org.jboss.invocation.InitialInterceptor.processInvocation(InitialInterceptor.java:21)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
at org.jboss.invocation.ChainedInterceptor.processInvocation(ChainedInterceptor.java:61)
at org.jboss.as.ee.component.interceptors.ComponentDispatcherInterceptor.processInvocation(ComponentDispatcherInterceptor.java:52)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
at org.jboss.as.ejb3.component.pool.PooledInstanceInterceptor.processInvocation(PooledInstanceInterceptor.java:51)
at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:340)
at org.jboss.as.ejb3.tx.CMTTxInterceptor.invokeInOurTx(CMTTxInterceptor.java:275)
... 33 more
Caused by: org.hibernate.boot.registry.classloading.spi.ClassLoadingException: Unable to load class [com.mysql.jdbc.Driver]
at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:229)
at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.loadDriverIfPossible(DriverManagerConnectionProviderImpl.java:161)
at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.buildCreator(DriverManagerConnectionProviderImpl.java:117)
at org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl.configure(DriverManagerConnectionProviderImpl.java:73)
at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:94)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:217)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:189)
at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.buildJdbcConnectionAccess(JdbcEnvironmentInitiator.java:145)
at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:66)
at org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:35)
at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:88)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:234)
... 80 more
Caused by: java.lang.ClassNotFoundException: Could not load requested class : com.mysql.jdbc.Driver
at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl$AggregatedClassLoader.findClass(ClassLoaderServiceImpl.java:217)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at org.hibernate.boot.registry.classloading.internal.ClassLoaderServiceImpl.classForName(ClassLoaderServiceImpl.java:226)
... 91 more
Here's a snip of my project directory structure
感谢任何帮助。我已经尝试了几乎所有可以在网上找到的解决方案，但我注意到它们主要用于简单的 Java 项目而不是企业项目。我还尝试使用 JDBC 驱动程序创建一个简单的连接来访问数据库，但这也不起作用。简单 Java 项目中的连接工作正常。提前致谢!
最佳答案
我确实解决了这个问题，但我不确定这是正确的方法还是问题实际上已经解决了。我在 META-INF 目录中向我的项目添加了一个 jboss-deployment-structure.xml 文件:
<jboss-deployment-structure>
<deployment>
<dependencies>
<module name="javax.api" />
<module name="javax.transaction.api" />
<module name="javax.xml.rpc.api" />
<module name="javax.rmi.api" />
<module name="org.omg.api" />
<module name="configext" />
</dependencies>
</deployment>
然后，在服务器安装根目录下的 modules/下，我添加了一个 configext/module/文件夹，并将我所有的 JAR 文件复制到其中，并在目录中添加了一个 module.xml 文件:
<module xmlns="urn:jboss:module:1.3" name="configext">
<dependencies>
<module name="javax.api" />
</dependencies>
<resources>
<resource-root path="mysql-connector-java-5.1.39-bin.jar"/>
<resource-root path="antlr-2.7.7.jar"/>
<resource-root path="cdi-api-1.1-PFD.jar"/>
<resource-root path="classmate-1.3.0.jar"/>
<resource-root path="dom4j-1.6.1.jar"/>
<resource-root path="el-api-2.2.jar"/>
<resource-root path="geronimo-jta_1.1_spec-1.1.1.jar"/>
<resource-root path="hibernate-commons-annotations-5.0.1.Final.jar"/>
<resource-root path="hibernate-core-5.2.1.Final.jar"/>
<resource-root path="hibernate-jpa-2.1-api-1.0.0.Final.jar"/>
<resource-root path="jandex-2.0.0.Final.jar"/>
<resource-root path="javassist-3.20.0-GA.jar"/>
<resource-root path="javax.inject-1.jar"/>
<resource-root path="jboss-interceptors-api_1.1_spec-1.0.0.Beta1.jar"/>
<resource-root path="jboss-logging-3.3.0.Final.jar"/>
<resource-root path="jsr250-api-1.0.jar"/>
</resources>
我在某处读到这会将这些包添加到服务器的全局类路径中。我可能完全错了，但这似乎有效。如果这不是永久修复或不正确的做事方式，我仍然愿意接受建议。非常感谢!
关于java - 无法使用 HIbernate 在 JBoss 上加载请求的类 : com. mysql.jdbc.Driver，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38609701/