本文介绍了如何使用休眠配置 Jaybird的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我将 jaybird 2.2.3 与 hibernate 3.5 一起使用，当我使用向导休眠映射文件和 pojos 数据库时，出现以下错误"java.lang.NullPointerException"
I'm using jaybird 2.2.3 with hibernate 3.5 and when I use the wizard to hibernate mapping files and pojos database the following error appears"java.lang.NullPointerException"
我对 mysql 使用相同的映射并且它工作正常，所以我相信它是 jaybird 中的东西
I use the same mapping with mysql and it works correctly, so I believe it is something in jaybird
My hibernate.cfg.xml
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">org.hibernate.dialect.FirebirdDialect</property>
<property name="hibernate.connection.driver_class">org.firebirdsql.jdbc.FBDriver</property>
<property name="hibernate.connection.url">jdbc:firebirdsql://XXXXXX:XXXX/X:XXXXXXXXXXXXXXXXXXX.FDB</property>
<property name="hibernate.connection.username">sysdba</property>
<property name="hibernate.connection.password">XXXXX</property>
</session-factory>
</hibernate-configuration>
INFO [org.hibernate.cfg.Configuration]: configuring from file: hibernate.cfg.xml
INFO [org.hibernate.cfg.Configuration]: Configured SessionFactory: null
INFO [org.hibernate.cfg.reveng.OverrideRepository]: Override file: C:Documents and Settingsmicro-40workspace estefirebirdsrcjavahibernate.reveng.xml
INFO [org.netbeans.modules.hibernate.util.HibernateUtil]: Found pre-existing database connection.
INFO [org.netbeans.modules.hibernate.util.HibernateUtil]: Database Connection is pre-established. Returning the conneciton.
INFO [org.hibernate.connection.ConnectionProviderFactory]: Initializing connection provider: org.netbeans.modules.hibernate.util.CustomJDBCConnectionProvider
INFO [org.netbeans.modules.hibernate.util.CustomJDBCConnectionProvider]: Loaded JDBC driver
INFO [org.netbeans.modules.hibernate.util.CustomJDBCConnectionProvider]: Got connection.. returning
INFO [org.netbeans.modules.hibernate.wizards.HibernateCodeGenWizardDescriptor]: access to hibernate fails.
java.lang.NullPointerException
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:86)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2005)
at org.hibernate.cfg.JDBCMetaDataConfiguration.readFromJDBC(JDBCMetaDataConfiguration.java:40)
at org.netbeans.modules.hibernate.wizards.HibernateCodeGenWizardDescriptor.checkConfig(Hibernat eCodeGenWizardDescriptor.java:282)
[catch] at org.netbeans.modules.hibernate.wizards.HibernateCodeGenWizardDescriptor.isValid(HibernateCod eGenWizardDescriptor.java:177)
at org.openide.WizardDescriptor.updateStateOpen(WizardDescriptor.java:872)
at org.openide.WizardDescriptor.updateState(WizardDescriptor.java:820)
at org.openide.loaders.TemplateWizard.updateState(TemplateWizard.java:754)
at org.netbeans.modules.project.ui.NewFileWizard.updateState(NewFileWizard.java:124)
at org.openide.WizardDescriptor._updateState(WizardDescriptor.java:798)
at org.openide.WizardDescriptor.access$200(WizardDescriptor.java:90)
at org.openide.WizardDescriptor$Listener.stateChanged(WizardDescriptor.java:2094)
at org.openide.util.WeakListenerImpl$Change.stateChanged(WeakListenerImpl.java:329)
at org.openide.loaders.TemplateWizardIterImpl.run(TemplateWizardIterImpl.java:275)
at org.openide.util.Mutex.doEvent(Mutex.java:1343)
at org.openide.util.Mutex.writeAccess(Mutex.java:457)
at org.openide.loaders.TemplateWizardIterImpl.fireStateChanged(TemplateWizardIterImpl.java:261)
at org.openide.loaders.TemplateWizardIterImpl.setIterator(TemplateWizardIterImpl.java:120)
at org.openide.loaders.TemplateWizardIteratorWrapper.setIterator(TemplateWizardIteratorWrapper. java:79)
at org.openide.loaders.TemplateWizard.setTemplateImpl(TemplateWizard.java:209)
at org.openide.loaders.TemplateWizard$1.run(TemplateWizard.java:231)
at org.openide.loaders.TemplateWizard$1.run(TemplateWizard.java:228)
at org.openide.util.Mutex.doEventAccess(Mutex.java:1363)
at org.openide.util.Mutex.readAccess(Mutex.java:273)
at org.openide.loaders.TemplateWizard.setTemplate(TemplateWizard.java:228)
at org.netbeans.modules.project.ui.TemplateChooserPanel.storeSettings(TemplateChooserPanel.java :168)
at org.netbeans.modules.project.ui.TemplateChooserPanel.storeSettings(TemplateChooserPanel.java :71)
at org.openide.WizardDescriptor.storeSettingsAndNotify(WizardDescriptor.java:1379)
at org.openide.WizardDescriptor.access$1700(WizardDescriptor.java:90)
at org.openide.WizardDescriptor$Listener$1.run(WizardDescriptor.java:2117)
at org.openide.WizardDescriptor.lazyValidate(WizardDescriptor.java:1502)
at org.openide.WizardDescriptor.access$1900(WizardDescriptor.java:90)
at org.openide.WizardDescriptor$Listener.actionPerformed(WizardDescriptor.java:2141)
at sun.reflect.GeneratedMethodAccessor182.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:601)
at org.openide.util.WeakListenerImpl$ProxyListener.invoke(WeakListenerImpl.java:457)
at com.sun.proxy.$Proxy57.actionPerformed(Unknown Source)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
at java.awt.Component.processMouseEvent(Component.java:6505)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
at java.awt.Component.processEvent(Component.java:6270)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4861)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Window.dispatchEventImpl(Window.java:2719)
at java.awt.Component.dispatchEvent(Component.java:4687)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:729)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:688)
at java.awt.EventQueue$3.run(EventQueue.java:686)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:702)
at java.awt.EventQueue$4.run(EventQueue.java:700)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:699)
at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:154)
at java.awt.WaitDispatchSupport$2.run(WaitDispatchSupport.java:182)
at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:221)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:219)
at java.awt.Dialog.show(Dialog.java:1082)
at org.netbeans.core.windows.services.NbPresenter.superShow(NbPresenter.java:1076)
at org.netbeans.core.windows.services.NbPresenter.doShow(NbPresenter.java:1126)
at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:1098)
at org.netbeans.core.windows.services.NbPresenter.run(NbPresenter.java:128)
at org.openide.util.Mutex.doEventAccess(Mutex.java:1363)
at org.openide.util.Mutex.readAccess(Mutex.java:273)
at org.netbeans.core.windows.services.NbPresenter.show(NbPresenter.java:1083)
at java.awt.Component.show(Component.java:1651)
at java.awt.Component.setVisible(Component.java:1603)
at java.awt.Window.setVisible(Window.java:1014)
at java.awt.Dialog.setVisible(Dialog.java:1005)
at org.netbeans.core.windows.services.DialogDisplayerImpl$1AWTQuery.showDialog(DialogDisplayerI mpl.java:260)
at org.netbeans.core.windows.services.DialogDisplayerImpl$1AWTQuery.run(DialogDisplayerImpl.jav a:186)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:727)
at java.awt.EventQueue.access$200(EventQueue.java:103)
at java.awt.EventQueue$3.run(EventQueue.java:688)
at java.awt.EventQueue$3.run(EventQueue.java:686)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:697)
at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
有人可以帮我吗?
推荐答案
在深入研究 Netbeans 的代码并将额外的日志记录添加到 Jaybird 之后，问题是 Netbeans 使用自定义类加载器加载驱动程序，该类加载器不返回资源META-INF/services(专用于 Jaybird 2.2.x:META-INF/services/org.firebirdsql.gds.impl.GDSFactoryPlugin).
After digging into the code of Netbeans and adding extra logging to Jaybird, the problem is that Netbeans loads the driver with a custom classloader that doesn't return resources in META-INF/services (specifically for Jaybird 2.2.x: META-INF/services/org.firebirdsql.gds.impl.GDSFactoryPlugin).
这会破坏驱动程序，因为这些服务定义用于加载可用的 GDSFactoryPlugin 定义(例如，用于 Type 4 默认实现、Type 4 Open Office 实现、Type 2 嵌入式客户端和 Type 2本地客户端).
This breaks the driver as these services definitions are used to load the available GDSFactoryPlugin definitions (eg one for the Type 4 default implementation, Type 4 Open Office implementation, the Type 2 embedded client and Type 2 native client).
我将添加某种回退机制或将此插件定义移动到一个单独的位置，并调查 Netbeans 这样做的原因，因为它对我来说没有多大意义.
I will add some kind of fallback mechanism or move this plugin definition to a separate location and also investigate why Netbeans does this, because it doesn't make a lot of sense to me.
使用 Jaybird 2.2.4 或更高版本.
Use Jaybird 2.2.4 or higher.
可以在 Jaybird 跟踪器中找到 2.2.4 中的完整更改列表:2.2.4 版.
A full list of changes in 2.2.4 can be found in the Jaybird tracker: Version 2.2.4.
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