OSGI Mylyn java.lang.ClassNotFoundException: AbstractRepositoryConnector

Question

我已经创建了两个Mylyn扩展(com.xyz.mylyn.ui.MyRepositoryUi扩展AbstractRepositoryConnectorUi和com.xyz.mylyn.core.MyRepositoryConnector扩展AbstractRepositoryConnector)。我通常使用Eclipse更新站点选项安装这些自定义扩展插件。

在安装这些自定义插件之前，我还成功地安装了先决条件依赖的Mylyn插件，即Mylyn任务列表、Mylyn任务聚焦界面和Mylyn Wikitext。在安装时，我看到下面两个jars包包含我从中扩展的Mylyn类，它们正确地出现在我的eclipse work plugins文件夹下。

1]包含扩展org.eclipse.mylyn.tasks.core.AbstractRepositoryConnector的org.eclipse.mylyn.tasks.core_3.6.0.v20110608-1400.jar

2]包含扩展org.eclipse.mylyn.tasks.ui.AbstractRepositoryConnectorUi的org.eclipse.mylyn.tasks.ui_3.6.2.v20110826-0100.jar

以下是我创建的ui插件plugin.xml文件-

'<?xml version="1.0" encoding="UTF-8"?>'
'<?eclipse version="3.2"?>'
'<plugin>'
'<extension point="org.eclipse.mylyn.tasks.ui.repositories">'
'<connectorCore class="com.xyz.mylyn.core.MyRepositoryConnector"'
'id="com.xyz.mylyn.core.myrepositoryconnector"'
'name="My Repository Connector"'
'type="My"/>'
'<connectorUi brandingIcon="images/connectionsmall.gif"'
'class="com.xyz.mylyn.ui.MyRepositoryUi" id="com.xyz.mylyn.ui.myconnectorui"'
'name="Connector UI" overlayIcon="images/mobius.gif"/>'
'<taskListMigrator class="com.xyz.mylyn.ui.MyTaskListMigrator"/>'
'</extension>'
'<extension'
'point="org.eclipse.mylyn.tasks.ui.editors">'
'<pageFactory'
'class="com.telelogic.synergy.integration.mylyn.ui.editor.MyTaskEditorPageFactory"'
'id="com.ibm.rational.synergy.integration.mylyn.ui.editor.mytaskeditorpagefactory">'
'</pageFactory>'
'</extension>'
'</plugin>'

然而，在安装自定义插件时，我得到了以下错误-

!ENTRY org.eclipse.mylyn.tasks.ui 4 0 2013-03-22 14:50:46.117
!MESSAGE Repository connectors failed to load.
!SUBENTRY 1 org.eclipse.mylyn.tasks.ui 4 0 2013-03-22 14:50:46.117
!MESSAGE Could not load connector core
!STACK 1
org.eclipse.core.runtime.CoreException: Plug-in com.xyz.integration.mylyn.ui was unable to load class com.xyz.mylyn.core.MyRepositoryConnector. at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.throwException(RegistryStrategyOSGI.java:194)
    at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:178)
    at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:905)
    at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)
    at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:55)
    at org.eclipse.mylyn.internal.tasks.ui.util.TasksUiExtensionReader$ConnectorDescriptor.createConnector(TasksUiExtensionReader.java:95)
    at org.eclipse.mylyn.internal.tasks.ui.util.TasksUiExtensionReader.initConnectorCores(TasksUiExtensionReader.java:327)
    at org.eclipse.mylyn.internal.tasks.ui.util.TasksUiExtensionReader.initStartupExtensions(TasksUiExtensionReader.java:245)
    at org.eclipse.mylyn.internal.tasks.ui.TasksUiPlugin.start(TasksUiPlugin.java:583)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:711)
    at java.security.AccessController.doPrivileged(Native Method)
        ...
        ...

which is caused by the following exception - 



Caused by: java.lang.NoClassDefFoundError: AbstractRepositoryConnector
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:791)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java:188)
    at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClassHoldingLock(ClasspathManager.java:632)
    at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClass(ClasspathManager.java:607)
    at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findClassImpl(ClasspathManager.java:568)
    at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClassImpl(ClasspathManager.java:492)
    at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:465)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)
    at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:395)
    at org.eclipse.osgi.internal.loader.SingleSourcePackage.loadClass(SingleSourcePackage.java:35)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:461)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
    at org.eclipse.osgi.internal.loader.BundleLoader.loadClass(BundleLoader.java:340)
    at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:229)
    at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1212)
    at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:174)
    ... 112 more
Caused by: java.lang.ClassNotFoundException: AbstractRepositoryConnector
    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:501)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:356)

当依赖的Mylyn库在eclipse工作空间的plugins文件夹下可用时，我不确定为什么类加载失败。

任何提示都会有很大的帮助。

谢谢，Aditya

Answer 1

有可能这些插件还没有被解析/安装。尝试使用以下方法进行检查：

尝试以下操作:打开控制台视图，从控制台的“打开控制台”上下文菜单中选择主机OSGi控制台，然后输入

ss org.eclipse.mylyn.tasks.core

在主机控制台OSGi面板中

如果插件不存在，请尝试重新安装mylyn。如果您使用RCP或PDE，则需要将此插件添加到必需的插件中。

也有可能你的发行版是无效的。如果你使用dropins文件夹并从dropins文件夹更新一些插件，就会发生这种情况。

您还可以将com.xyz.integration.mylyn.ui插件添加到com.xyz的依赖项中...