Osgi Can'；t加载数据库提供程序连接器驱动程序_Osgi_Eclipselink_Equinox

Osgi Can'；t加载数据库提供程序连接器驱动程序

osgi

Osgi Can'；t加载数据库提供程序连接器驱动程序,osgi,eclipselink,equinox,Osgi,Eclipselink,Equinox,我已经安装了独立的Equinox，并将其用作eclipse中的运行配置。该项目使用EclipseLink作为JPA，并将其配置为使用derby和mysql提供程序。这些提供程序打包成包并在OSGi容器中激活。当我从eclipse运行项目并激活我的包时，JPA工厂被正常创建，项目工作正常但是！运行equinox单机版eclipselink时无法加载数据库连接器驱动程序。写入的驱动程序打包为捆绑包并激活我注意到，Eclipse使用了与我运行Equinox单机版相同的配置和相同的捆绑包集。以及ec

我已经安装了独立的Equinox，并将其用作eclipse中的运行配置。该项目使用EclipseLink作为JPA，并将其配置为使用derby和mysql提供程序。这些提供程序打包成包并在OSGi容器中激活。当我从eclipse运行项目并激活我的包时，JPA工厂被正常创建，项目工作正常

但是！运行equinox单机版eclipselink时无法加载数据库连接器驱动程序。写入的驱动程序打包为捆绑包并激活

我注意到，Eclipse使用了与我运行Equinox单机版相同的配置和相同的捆绑包集。以及eclipse用来运行的包内部树

据我所知，OSGi容器中不需要java类路径——使用的是捆绑包。它们被导入到我插件的manifest.mf中

有什么问题，我不明白。为什么应用程序找不到驱动程序类

好的，我为derby驱动程序提供了完整的异常调用堆栈。看来EL功能正常。对于mysql驱动程序，问题是相同的，但是callstack有点不同。当我从eclipse运行相同的程序时，它工作正常

这是我的配置：

id      State       Bundle
0       ACTIVE      org.eclipse.osgi_3.8.100.v20120912-141032
                    Fragments=724, 726, 728
694     ACTIVE      org.eclipse.equinox.simpleconfigurator_1.0.400.v20120828-033
824
695     ACTIVE      com.ibm.icu.base_4.4.2.v20110831
696     ACTIVE      com.mysql.jdbc_5.8.0
697     ACTIVE      javax.el_2.2.0.v201108011116
698     ACTIVE      javax.persistence_2.0.4.v201112161009
699     ACTIVE      javax.servlet_3.0.0.v201112011016
700     ACTIVE      javax.servlet.jsp_2.2.0.v201112011158
702     ACTIVE      org.apache.felix.gogo.command_0.8.0.v201108120515
703     ACTIVE      org.apache.felix.gogo.runtime_0.8.0.v201108120515
704     ACTIVE      org.apache.felix.gogo.shell_0.8.0.v201110170705
705     ACTIVE      org.eclipse.core.commands_3.6.1.v20120521-2329
706     ACTIVE      org.eclipse.core.contenttype_3.4.200.v20120523-2004
707     ACTIVE      org.eclipse.core.databinding_1.4.1.v20120521-2329
708     ACTIVE      org.eclipse.core.databinding.observable_1.4.1.v20120521-2329
709     ACTIVE      org.eclipse.core.databinding.property_1.4.100.v20120523-1955
710     ACTIVE      org.eclipse.core.expressions_3.4.401.v20120627-124442
711     ACTIVE      org.eclipse.core.jobs_3.5.300.v20120622-204750
712     ACTIVE      org.eclipse.core.runtime_3.8.0.v20120521-2346
713     ACTIVE      org.eclipse.equinox.app_1.3.100.v20120522-1841
714     ACTIVE      org.eclipse.equinox.common_3.6.100.v20120522-1841
715     ACTIVE      org.eclipse.equinox.console_1.0.0.v20120522-1841
716     ACTIVE      org.eclipse.equinox.ds_1.4.0.v20120522-1841
717     ACTIVE      org.eclipse.equinox.frameworkadmin_2.0.100.v20120606-175127
718     ACTIVE      org.eclipse.equinox.frameworkadmin.equinox_1.0.400.v20120428-0117
719     ACTIVE      org.eclipse.equinox.http.jetty_3.0.0.v20120522-1841
720     ACTIVE      org.eclipse.equinox.http.registry_1.1.200.v20120912-125810
721     ACTIVE      org.eclipse.equinox.http.servlet_1.1.300.v20120912-125810
722     ACTIVE      org.eclipse.equinox.preferences_3.5.0.v20120918-182152
723     ACTIVE      org.eclipse.equinox.registry_3.5.300.v20120731-134527
724     RESOLVED    org.eclipse.equinox.servletbridge.extensionbundle_1.2.100.v20120522-2049
                    Master=0
725     ACTIVE      org.eclipse.equinox.simpleconfigurator.manipulator_2.0.0.v20110808-1657
726     RESOLVED    org.eclipse.equinox.transforms.hook_1.0.400.v20120522-2049
                    Master=0
727     ACTIVE      org.eclipse.equinox.util_1.0.400.v20120917-191249
728     RESOLVED    org.eclipse.equinox.weaving.hook_1.0.200.v20120524-1707
                    Master=0
729     ACTIVE      org.eclipse.help_3.6.0.v20120521-2344
730     ACTIVE      org.eclipse.jetty.continuation_8.1.3.v20120522
731     ACTIVE      org.eclipse.jetty.http_8.1.3.v20120522
732     ACTIVE      org.eclipse.jetty.io_8.1.3.v20120522
733     ACTIVE      org.eclipse.jetty.security_8.1.3.v20120522
734     ACTIVE      org.eclipse.jetty.server_8.1.3.v20120522
735     ACTIVE      org.eclipse.jetty.servlet_8.1.3.v20120522
736     ACTIVE      org.eclipse.jetty.util_8.1.3.v20120522
737     ACTIVE      org.eclipse.osgi.services_3.3.100.v20120522-1822
738     ACTIVE      org.eclipse.osgi.util_3.2.300.v20120912-140840
739     ACTIVE      org.eclipse.persistence.asm_3.3.1.v201206041142
740     ACTIVE      org.eclipse.persistence.core_2.4.0.v20120608-r11652
741     ACTIVE      org.eclipse.persistence.jpa_2.4.0.v20120608-r11652
742     ACTIVE      org.eclipse.persistence.jpa.osgi_2.4.0.v20120608-r11652
743     ACTIVE      org.eclipse.rap.jface_2.0.0.20120821-1934
744     ACTIVE      org.eclipse.rap.jface.databinding_2.0.0.20120821-1934
745     ACTIVE      org.eclipse.rap.rwt_2.0.0.20120821-1934
746     ACTIVE      org.eclipse.rap.rwt.osgi_2.0.0.20120821-1934
747     ACTIVE      org.eclipse.rap.ui_2.0.0.20120821-1934
748     ACTIVE      org.eclipse.rap.ui.workbench_1.5.100.20120821-1934
749     ACTIVE      ru.futurelink.testrap_1.0.0.qualifier
750     ACTIVE      org.apache.derby_1.0.0
osgi>

这就是我运行project的方式：

java -Declipse.ignoreApp=true -Dosgi.noShutdown=true -cp C:/Projects/ru.futurelink.testrap/lib/eclipselink.jar -cp C:/Projects/ru.futurelink.testrap/lib/javax.persistence_1.0.0.jar -cp C:/Projects/ru.futurelink.testrap/lib/derby.jar -cp C:/Projects/ru.futurelink.testrap/lib/mysql-connector-java-5.0.8-bin.jar -jar plugins\org.eclipse.osgi_3.8.100.v20120912-141032.jar  -dev file:C:/Equinox/plugins/configuration/dev.properties -os win32 -ws win32 -arch x86_64 -nl ru_RU -console -consoleLog

这就是调用堆栈：

[EL Info]: 2012-09-30 20:59:57.778--ServerSession(333070563)--EclipseLink, version: Eclipse Persistence Services - 2.4.0.v20120608-r11652
[EL Severe]: ejb: 2012-09-30 20:59:58.213--ServerSession(333070563)--java.lang.NullPointerException
2012-09-30 20:59:58.213:WARN:oejs.ServletHandler:ERROR:  /examples
java.lang.reflect.UndeclaredThrowableException
    at $Proxy0.createEntityManager(Unknown Source)
    at ru.futurelink.moneyorganizer.data.MODatabase.<init>(MODatabase.java:13)
    at ru.futurelink.moneyorganizer.ApplicationEntryPoint.createUI(ApplicationEntryPoint.java:22)
    at org.eclipse.rap.rwt.internal.lifecycle.RWTLifeCycle.createUI(RWTLifeCycle.java:177)
    at org.eclipse.rap.rwt.internal.lifecycle.RWTLifeCycle$UIThreadController.run(RWTLifeCycle.java:289)
    at java.lang.Thread.run(Thread.java:722)
    at org.eclipse.rap.rwt.internal.lifecycle.UIThread.run(UIThread.java:102)
Caused by:
java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.eclipse.persistence.jpa.osgi.EMFServiceProxyHandler.invoke(EMFServiceProxyHandler.java:77)
    at $Proxy0.createEntityManager(Unknown Source)
    at ru.futurelink.moneyorganizer.data.MODatabase.<init>(MODatabase.java:13)
    at ru.futurelink.moneyorganizer.ApplicationEntryPoint.createUI(ApplicationEntryPoint.java:22)
    at org.eclipse.rap.rwt.internal.lifecycle.RWTLifeCycle.createUI(RWTLifeCycle.java:177)
    at org.eclipse.rap.rwt.internal.lifecycle.RWTLifeCycle$UIThreadController.run(RWTLifeCycle.java:289)
    at java.lang.Thread.run(Thread.java:722)
    at org.eclipse.rap.rwt.internal.lifecycle.UIThread.run(UIThread.java:102)
Caused by:
javax.persistence.PersistenceException: java.lang.NullPointerException
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:602)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getDatabaseSession(EntityManagerFactoryDelegate.java:186)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:278)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:304)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:282)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.eclipse.persistence.jpa.osgi.EMFServiceProxyHandler.invoke(EMFServiceProxyHandler.java:77)
    at $Proxy0.createEntityManager(Unknown Source)
    at ru.futurelink.moneyorganizer.data.MODatabase.<init>(MODatabase.java:13)
    at ru.futurelink.moneyorganizer.ApplicationEntryPoint.createUI(ApplicationEntryPoint.java:22)
    at org.eclipse.rap.rwt.internal.lifecycle.RWTLifeCycle.createUI(RWTLifeCycle.java:177)
    at org.eclipse.rap.rwt.internal.lifecycle.RWTLifeCycle$UIThreadController.run(RWTLifeCycle.java:289)
    at java.lang.Thread.run(Thread.java:722)
    at org.eclipse.rap.rwt.internal.lifecycle.UIThread.run(UIThread.java:102)
Caused by:
java.lang.NullPointerException
    at org.apache.derby.jdbc.EmbeddedDriver.connect(Unknown Source)
    at org.eclipse.persistence.sessions.DefaultConnector.directConnect(DefaultConnector.java:165)
    at org.eclipse.persistence.sessions.DefaultConnector.connect(DefaultConnector.java:117)
    at org.eclipse.persistence.sessions.DatasourceLogin.connectToDatasource(DatasourceLogin.java:162)
    at org.eclipse.persistence.internal.sessions.DatabaseSessionImpl.loginAndDetectDatasource(DatabaseSessionImpl.java:685)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryProvider.login(EntityManagerFactoryProvider.java:213)
    at org.eclipse.persistence.internal.jpa.EntityManagerSetupImpl.deploy(EntityManagerSetupImpl.java:542)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.getDatabaseSession(EntityManagerFactoryDelegate.java:186)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryDelegate.createEntityManagerImpl(EntityManagerFactoryDelegate.java:278)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManagerImpl(EntityManagerFactoryImpl.java:304)
    at org.eclipse.persistence.internal.jpa.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:282)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.eclipse.persistence.jpa.osgi.EMFServiceProxyHandler.invoke(EMFServiceProxyHandler.java:77)
    at $Proxy0.createEntityManager(Unknown Source)
    at ru.futurelink.moneyorganizer.data.MODatabase.<init>(MODatabase.java:13)
    at ru.futurelink.moneyorganizer.ApplicationEntryPoint.createUI(ApplicationEntryPoint.java:22)
    at org.eclipse.rap.rwt.internal.lifecycle.RWTLifeCycle.createUI(RWTLifeCycle.java:177)
    at org.eclipse.rap.rwt.internal.lifecycle.RWTLifeCycle$UIThreadController.run(RWTLifeCycle.java:289)
    at java.lang.Thread.run(Thread.java:722)
    at org.eclipse.rap.rwt.internal.lifecycle.UIThread.run(UIThread.java:102)

下面是我的persistence.xml：

<?xml version="1.0" encoding="UTF-8" ?>
<persistence xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"
version="2.0" xmlns="http://java.sun.com/xml/ns/persistence">

<persistence-unit name="prov" transaction-type="RESOURCE_LOCAL">      
    <class>ru.futurelink.moneyorganizer.data.MOUserEntity</class>
    <properties>
      <property name="javax.persistence.jdbc.driver" value="org.apache.derby.jdbc.EmbeddedDriver" />
      <property name="javax.persistence.jdbc.url" value="jdbc:derby:/sampledb;create=true" />

      <!-- EclipseLink should create the database schema automatically -->
      <property name="eclipselink.ddl-generation" value="drop-and-create-tables" />
      <property name="eclipselink.ddl-generation.output-mode" value="database" />
    </properties>

  </persistence-unit>  
</persistence>


ru.futurelink.moneyorganizer.data.MOUserEntity

您还没有提供代码和异常，所以我想您应该做以下几点

如果您使用JDBC并通过创建连接

connection = DriverManager.getConnection(connectionUrl, username, password);

对于osgi中的sole语句，它通常会抛出异常，您不会得到任何驱动程序，并且驱动程序为null

但是如果你用

Class.forName(driver);

在创建连接之前，osgi能够在运行时加载驱动程序

OSGi中的反射有点正统

我找到了解决办法。Eclipse使用org.Eclipse.equinox.launcher_1.3.0.v20120522-1813.jar启动OSGi框架，但我尝试加载org.Eclipse.OSGi_3.8.100.v2020912-141032.jar。我认为没有启动器的框架不支持反射，因为缺少类加载器。我不是舒尔，因为该机制属于这种类型，但JPA现在可以工作并加载所有驱动程序。

对于初始化db连接的捆绑包中的相关db包，您的清单中是否有导入包声明？此处缺少相关信息。请向我们显示您收到的确切错误和相关日志消息。EclipseLink使用Class.forName（）创建数据库连接。从我在问题中提供的stacktrace可以清楚地看出。因此与反射无关。）

connection = DriverManager.getConnection(connectionUrl, username, password);

Class.forName(driver);