使用C3P0和Postgresql的java Hibernate连接
我正在尝试使用postgresql和glassfish启动并运行一个应用程序（jadasite）。应用程序设计者推荐tomcat和mysql。我不能真正使用tomcat和mysql来实现这个应用程序。应用程序使用JPA，因此postgresql应该没有问题。设计者确实提到了postgresql/许多其他数据库应该可以工作
以下是我使用以下两页作为参考所做的工作：
jada.properties
log4j.directory=/tmp
hibernate.connection.password=password
working.directory=/tmp
encryption.key=fVOew3eAhr+hdZ9eQLeEtw\=\=
hibernate.connection.url=jdbc\:postgresql:dev-rdbms.example.com:5432/jada"/>
hibernate.connection.driver_class=org.postgresql.drivers
persistence.xml(parital)
<property name="hibernate.connection.driver_class" value="org.postgresql.Driver"/>
<property name="hibernate.connection.username" value="jada"/>
<property name="hibernate.connection.password" value="password"/>
<property name="hibernate.connection.url" value="jdbc:postgresql://dev-rdbms.example.com:5432/jada>
<property name="hibernate.dialect" value="org.hibernate.dialect.PostgreSQLDialect"/>
<property name="hibernate.current_session_context_class" value="thread"/>
<property name="hibernate.connection.provider_class" value="org.hibernate.connection.C3P0ConnectionProvider"/
然后，我使用mysql2psql创建了一个与postgresql兼容的数据库转储，加载了所有数据，并创建了具有适当权限和访问权限的适当用户。（通过运行glassfish服务器的psql进行测试）
因此，在进行更改之后，我将最新的postgresql jdbc 4驱动程序放入applications WEB-INF/lib目录。制作了一个新的war文件并将其部署到我的glassfish v3中。01服务器
我得到以下错误。在我看来，C3P0无法找到JDBC驱动程序（位于apps WEB-INF/lib目录和glassfish domains lib目录中）
[#| 2011-04-28811:34:58.508-0500 |严重|玻璃鱼3.0.1|
javax.enterprise.system.container.web.com.sun.enterprise.web|_ThreadID=11;_ThreadName=FelixStartLevel;|WebModule[/jada]JadaSite: Unable to initialize JPA connection
javax.persistence.PersistenceException: [PersistenceUnit: jadaSite] Unable to build EntityManagerFactory
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:677)
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:126)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:78)
at com.jada.jpa.connection.JpaConnection.init(JpaConnection.java:79)
at com.jada.system.Initializer.init(Initializer.java:162)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1428)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1230)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5007)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:5280)
at com.sun.enterprise.web.WebModule.start(WebModule.java:499)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:928)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:912)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:694)
at com.sun.enterprise.web.WebContainer.loadWebModule(WebContainer.java:1947)
at com.sun.enterprise.web.WebContainer.loadWebModule(WebContainer.java:1619)
at com.sun.enterprise.web.WebApplication.start(WebApplication.java:90)
at org.glassfish.internal.data.EngineRef.start(EngineRef.java:126)
at org.glassfish.internal.data.ModuleInfo.start(ModuleInfo.java:241)
at org.glassfish.internal.data.ApplicationInfo.start(ApplicationInfo.java:236)
at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:339)
at com.sun.enterprise.v3.server.ApplicationLoaderService.processApplication(ApplicationLoaderService.java:362)
at com.sun.enterprise.v3.server.ApplicationLoaderService.postConstruct(ApplicationLoaderService.java:185)
at com.sun.hk2.component.AbstractWombImpl.inject(AbstractWombImpl.java:174)
at com.sun.hk2.component.ConstructorWomb$1.run(ConstructorWomb.java:87)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.hk2.component.ConstructorWomb.initialize(ConstructorWomb.java:84)
at com.sun.hk2.component.AbstractWombImpl.get(AbstractWombImpl.java:77)
at com.sun.hk2.component.SingletonInhabitant.get(SingletonInhabitant.java:58)
at com.sun.hk2.component.LazyInhabitant.get(LazyInhabitant.java:107)
at com.sun.hk2.component.AbstractInhabitantImpl.get(AbstractInhabitantImpl.java:60)
at com.sun.enterprise.v3.server.AppServerStartup.run(AppServerStartup.java:236)
at com.sun.enterprise.v3.server.AppServerStartup.start(AppServerStartup.java:128)
at com.sun.enterprise.module.bootstrap.Main.launch(Main.java:457)
at com.sun.enterprise.module.bootstrap.Main.launch(Main.java:401)
at org.jvnet.hk2.osgiadapter.HK2Main.start(HK2Main.java:125)
at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:640)
at org.apache.felix.framework.Felix.activateBundle(Felix.java:1700)
at org.apache.felix.framework.Felix.startBundle(Felix.java:1622)
at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:915)
at org.jvnet.hk2.osgimain.Main.start(Main.java:140)
at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:640)
at org.apache.felix.framework.Felix.activateBundle(Felix.java:1700)
at org.apache.felix.framework.Felix.startBundle(Felix.java:1622)
at org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:1077)
at org.apache.felix.framework.StartLevelImpl.run(StartLevelImpl.java:264)
at java.lang.Thread.run(Thread.java:619)
Caused by: org.hibernate.HibernateException: JDBC Driver class not found:
at org.hibernate.connection.C3P0ConnectionProvider.configure(C3P0ConnectionProvider.java:123)
at org.hibernate.connection.ConnectionProviderFactory.newConnectionProvider(ConnectionProviderFactory.java:137)
at org.hibernate.ejb.InjectionSettingsFactory.createConnectionProvider(InjectionSettingsFactory.java:29)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:89)
at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2119)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2115)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1339)
at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:669)
... 45 more
Caused by: java.lang.ClassNotFoundException:
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at org.hibernate.util.ReflectHelper.classForName(ReflectHelper.java:192)
at org.hibernate.connection.C3P0ConnectionProvider.configure(C3P0ConnectionProvider.java:118)
... 53 more
|#]
有没有人看到我的连接参数有什么问题，或者知道C3P0怎么会错过这些驱动程序
编辑
我确实看到了一些问题，看起来它们是由C3P0没有找到驱动程序引起的，所以我也尝试将C3P0 jar扔进glassfish库，但仍然得到了相同的错误。下面是评论中的错误，以更好的方式提供更多信息
[#|2011-04-28T12:37:49.964-0500|INFO|glassfish3.0.1|javax.enterprise.system.std.com.sun.enterprise.v3.services.impl|_ThreadID=11;_ThreadName=Thread-1;|2011-04-28 12:37:49,964 INFO [FelixStartLevel] (JCLLoggerAdapter.java:265) - Mapping collection: com.jada.jpa.entity.ShippingType.shippingMethodRegionTypes -> shipping_method_region_type
|#]
[#|2011-04-28T12:37:50.009-0500|INFO|glassfish3.0.1|javax.enterprise.system.std.com.sun.enterprise.v3.services.impl|_ThreadID=11;_ThreadName=Thread-1;|2011-04-28 12:37:50,008 INFO [FelixStartLevel] (JCLLoggerAdapter.java:265) - Hibernate Validator not found: ignoring
|#]
[#|2011-04-28T12:37:50.405-0500|INFO|glassfish3.0.1|javax.enterprise.system.std.com.sun.enterprise.v3.services.impl|_ThreadID=11;_ThreadName=Thread-1;|2011-04-28 12:37:50,404 INFO [FelixStartLevel] (JCLLoggerAdapter.java:286) - Unable to find org.hibernate.search.event.FullTextIndexEventListener on the classpath. Hibernate Search is not enabled.
|#]
[#|2011-04-28T12:37:50.491-0500|INFO|glassfish3.0.1|javax.enterprise.system.std.com.sun.enterprise.v3.services.impl|_ThreadID=11;_ThreadName=Thread-1;|2011-04-28 12:37:50,490 INFO [FelixStartLevel] (JCLLoggerAdapter.java:265) - Initializing connection provider: org.hibernate.connection.C3P0ConnectionProvider
|#]
[#|2011-04-28T12:37:50.504-0500|INFO|glassfish3.0.1|javax.enterprise.system.std.com.sun.enterprise.v3.services.impl|_ThreadID=11;_ThreadName=Thread-1;|2011-04-28 12:37:50,504 INFO [FelixStartLevel] (JCLLoggerAdapter.java:265) - C3P0 using driver: at URL:
|#]
[#|2011-04-28T12:37:50.506-0500|INFO|glassfish3.0.1|javax.enterprise.system.std.com.sun.enterprise.v3.services.impl|_ThreadID=11;_ThreadName=Thread-1;|2011-04-28 12:37:50,505 INFO [FelixStartLevel] (JCLLoggerAdapter.java:265) - Connection properties: {user=, password=****, autocommit=true, release_mode=auto}
|#]
[#|2011-04-28T12:37:50.507-0500|INFO|glassfish3.0.1|javax.enterprise.system.std.com.sun.enterprise.v3.services.impl|_ThreadID=11;_ThreadName=Thread-1;|2011-04-28 12:37:50,506 INFO [FelixStartLevel] (JCLLoggerAdapter.java:265) - autocommit mode: true
|#]
[#|2011-04-28T12:37:50.543-0500|INFO|glassfish3.0.1|javax.enterprise.system.std.com.sun.enterprise.v3.services.impl|_ThreadID=11;_ThreadName=Thread-1;|2011-04-28 12:37:50,531 ERROR [FelixStartLevel] (JCLLoggerAdapter.java:535) - JDBC Driver class not found:
java.lang.ClassNotFoundException:
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:169)
at org.hibernate.util.ReflectHelper.classForName(ReflectHelper.java:192)
at org.hibernate.connection.C3P0ConnectionProvider.configure(C3P0ConnectionProvider.java:118)
at org.hibernate.connection.ConnectionProviderFactory.newConnectionProvider(ConnectionProviderFactory.java:137)
at org.hibernate.ejb.InjectionSettingsFactory.createConnectionProvider(InjectionSettingsFactory.java:29)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:89)
at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2119)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2115)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1339)
at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867)
at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:669)
at org.hibernate.ejb.HibernatePersistence.createEntityManagerFactory(HibernatePersistence.java:126)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:78)
at com.jada.jpa.connection.JpaConnection.init(JpaConnection.java:79)
at com.jada.system.Initializer.init(Initializer.java:162)
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1428)
at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1230)
at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5007)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:5280)
at com.sun.enterprise.web.WebModule.start(WebModule.java:499)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:928)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:912)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:694)
at com.sun.enterprise.web.WebContainer.loadWebModule(WebContainer.java:1947)
at com.sun.enterprise.web.WebContainer.loadWebModule(WebContainer.java:1619)
at com.sun.enterprise.web.WebApplication.start(WebApplication.java:90)
at org.glassfish.internal.data.EngineRef.start(EngineRef.java:126)
at org.glassfish.internal.data.ModuleInfo.start(ModuleInfo.java:241)
at org.glassfish.internal.data.ApplicationInfo.start(ApplicationInfo.java:236)
at com.sun.enterprise.v3.server.ApplicationLifecycle.deploy(ApplicationLifecycle.java:339)
at com.sun.enterprise.v3.server.ApplicationLoaderService.processApplication(ApplicationLoaderService.java:362)
at com.sun.enterprise.v3.server.ApplicationLoaderService.postConstruct(ApplicationLoaderService.java:185)
at com.sun.hk2.component.AbstractWombImpl.inject(AbstractWombImpl.java:174)
at com.sun.hk2.component.ConstructorWomb$1.run(ConstructorWomb.java:87)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.hk2.component.ConstructorWomb.initialize(ConstructorWomb.java:84)
at com.sun.hk2.component.AbstractWombImpl.get(AbstractWombImpl.java:77)
at com.sun.hk2.component.SingletonInhabitant.get(SingletonInhabitant.java:58)
at com.sun.hk2.component.LazyInhabitant.get(LazyInhabitant.java:107)
at com.sun.hk2.component.AbstractInhabitantImpl.get(AbstractInhabitantImpl.java:60)
at com.sun.enterprise.v3.server.AppServerStartup.run(AppServerStartup.java:236)
at com.sun.enterprise.v3.server.AppServerStartup.start(AppServerStartup.java:128)
at com.sun.enterprise.module.bootstrap.Main.launch(Main.java:457)
at com.sun.enterprise.module.bootstrap.Main.launch(Main.java:401)
at org.jvnet.hk2.osgiadapter.HK2Main.start(HK2Main.java:125)
at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:640)
at org.apache.felix.framework.Felix.activateBundle(Felix.java:1700)
at org.apache.felix.framework.Felix.startBundle(Felix.java:1622)
at org.apache.felix.framework.BundleImpl.start(BundleImpl.java:915)
at org.jvnet.hk2.osgimain.Main.start(Main.java:140)
at org.apache.felix.framework.util.SecureAction.startActivator(SecureAction.java:640)
at org.apache.felix.framework.Felix.activateBundle(Felix.java:1700)
at org.apache.felix.framework.Felix.startBundle(Felix.java:1622)
at org.apache.felix.framework.Felix.setActiveStartLevel(Felix.java:1077)
at org.apache.felix.framework.StartLevelImpl.run(StartLevelImpl.java:264)
at java.lang.Thread.run(Thread.java:619)
|#]
# 1 楼答案
这里有两件事似乎很奇怪：
1）ClassNotFoundException的stacktrace没有提到未找到的类的名称：
这似乎意味着它正在尝试加载一个没有名称的类，否则您可能会看到找不到的类的名称
2）不确定这是否只是复制粘贴错误，但在上面的配置片段中，您缺少此行的结束引号：
这将导致格式错误的XML
3）当你说
你的意思是说你制作了一个新的“war”文件，而不是“jar”？您需要确保postgres jdbc jar最终位于glassfish的类路径上
# 2 楼答案
为什么属性文件中有
hibernate.connection.driver_class=org.postgresql.drivers？它不应该是org.postgresql.Driver吗编辑：
啊!！看起来Jadasite使用属性文件加载驱动程序类
从
com/jada/jpa/connection/JpaConnection.java类：其读作（在
com/jada/system/Initializer.java）：它来自（在
com/jada/install/process/Installer.java）：从文件（在
com/jada/util/Constants.java中）读取：# 3 楼答案
让我们试试这个：
您是否正确使用EJB（JPA表示EJB）？所以，你至少有一只耳朵，一个罐子，可能还有一场战争，对吧？你知道，JAR不能访问WARs文件。如果您的postgresql jdbc 4驱动程序位于WAR/WEB-INF/lib上，您的JAR（需要它）将无法访问
尝试将您的库放在EAR库中（查找glassfish文档，但也类似于EAR/WEB-INF/lib），或者将其放在服务器库中（类似于glassfish_DIR/lib/classes）