EMF+GEF的一些总结

     最近以新手的身份，开始了Eclipse的插件开发工作，要完成一个Designer的工作，使用的是EMF+GEF的结合，利用EMF来建模，然后用GEF完成可视化的工作。不废话了，总结下自己工作中遇到的问题吧。

 

1、建立一个EMF的工程，建立属于自己的模型，从*.genmodel文件产生一个model文件，这样就完成了建模的插件。

 

2、建立一个插件项目，用来完成自己的Designer；

 

3、在新建的插件项目中要使用已经建好的model，有两种方式：一是将生成model代码文件的目标目录修改到插件项目中，在*.genmodel的属性试图中可以找到生成的目标目录，改之。这样就是等于是直接在自己的插件项目中建立了模型（官方的教程：use gef with emf，好像是这样做的）；二就是直接从genmodel中生成model的代码，然后在插件项目中的plugin.xml-->dependencies-->required plug-ins中加入生成的model插件即可。注意的是，在model的项目的plugin.xml中的runtime-->export package中有model的相关包。在3.3的平台中，这样做应该比较容易实现，依赖应该也是没什么问题的。

 

4、模型有了，就可以开始自己的GEF的各项工作了。

 

错误：

 

这次使用EMF+GEF时遇到了一个问题，当我建好工程后，想要调试看看效果，结果报这个错误：

ava.lang.ClassNotFoundException: **.**.Editor
	at java.lang.ClassLoader.findClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at org.eclipse.osgi.framework.internal.core.BundleLoader.findClassInternal(BundleLoader.java:429)
	at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:369)
	at org.eclipse.osgi.framework.internal.core.BundleLoader.findClass(BundleLoader.java:357)
	at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:83)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at org.eclipse.osgi.framework.internal.core.BundleLoader.loadClass(BundleLoader.java:289)
	at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:227)
	at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1269)
	at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:160)
	at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:788)
	at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)
	at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:51)
	at org.eclipse.ui.internal.WorkbenchPlugin.createExtension(WorkbenchPlugin.java:244)
	at org.eclipse.ui.internal.registry.EditorDescriptor.createEditor(EditorDescriptor.java:231)
	at org.eclipse.ui.internal.EditorManager.createPart(EditorManager.java:841)
	at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:606)
	at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:426)
	at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:592)
	at org.eclipse.ui.internal.PartPane.setVisible(PartPane.java:299)
	at org.eclipse.ui.internal.presentations.PresentablePart.setVisible(PresentablePart.java:179)
	at org.eclipse.ui.internal.presentations.util.PresentablePartFolder.select(PresentablePartFolder.java:268)
	at org.eclipse.ui.internal.presentations.util.LeftToRightTabOrder.select(LeftToRightTabOrder.java:65)
	at org.eclipse.ui.internal.presentations.util.TabbedStackPresentation.selectPart(TabbedStackPresentation.java:400)
	at org.eclipse.ui.internal.PartStack.refreshPresentationSelection(PartStack.java:1256)
	at org.eclipse.ui.internal.PartStack.setSelection(PartStack.java:1209)
	at org.eclipse.ui.internal.PartStack.showPart(PartStack.java:1604)
	at org.eclipse.ui.internal.PartStack.add(PartStack.java:499)
	at org.eclipse.ui.internal.EditorStack.add(EditorStack.java:103)
	at org.eclipse.ui.internal.PartStack.add(PartStack.java:485)
	at org.eclipse.ui.internal.EditorStack.add(EditorStack.java:112)
	at org.eclipse.ui.internal.EditorSashContainer.addEditor(EditorSashContainer.java:63)
	at org.eclipse.ui.internal.EditorAreaHelper.addToLayout(EditorAreaHelper.java:217)
	at org.eclipse.ui.internal.EditorAreaHelper.addEditor(EditorAreaHelper.java:207)
	at org.eclipse.ui.internal.EditorManager.createEditorTab(EditorManager.java:774)
	at org.eclipse.ui.internal.EditorManager.openEditorFromDescriptor(EditorManager.java:673)
	at org.eclipse.ui.internal.EditorManager.openEditor(EditorManager.java:634)
	at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditorBatched(WorkbenchPage.java:2737)
	at org.eclipse.ui.internal.WorkbenchPage.busyOpenEditor(WorkbenchPage.java:2651)
	at org.eclipse.ui.internal.WorkbenchPage.access$13(WorkbenchPage.java:2643)
	at org.eclipse.ui.internal.WorkbenchPage$10.run(WorkbenchPage.java:2595)
	at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:67)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2590)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2574)
	at org.eclipse.ui.internal.WorkbenchPage.openEditor(WorkbenchPage.java:2565)
	at org.eclipse.ui.ide.IDE.openEditor(IDE.java:644)
	at org.eclipse.ui.ide.IDE.openEditor(IDE.java:603)
	at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:286)
	at org.eclipse.jdt.internal.ui.javaeditor.EditorUtility.openInEditor(EditorUtility.java:139)
	at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:194)
	at org.eclipse.jdt.ui.actions.OpenAction.run(OpenAction.java:175)
	at org.eclipse.jdt.ui.actions.SelectionDispatchAction.dispatchRun(SelectionDispatchAction.java:268)
	at org.eclipse.jdt.ui.actions.SelectionDispatchAction.run(SelectionDispatchAction.java:244)
	at org.eclipse.jdt.internal.ui.packageview.PackageExplorerActionGroup.handleOpen(PackageExplorerActionGroup.java:316)
	at org.eclipse.jdt.internal.ui.packageview.PackageExplorerPart$5.open(PackageExplorerPart.java:613)
	at org.eclipse.jface.viewers.StructuredViewer$2.run(StructuredViewer.java:820)
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
	at org.eclipse.core.runtime.Platform.run(Platform.java:857)
	at org.eclipse.ui.internal.JFaceUtil$1.run(JFaceUtil.java:46)
	at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:199)
	at org.eclipse.jface.viewers.StructuredViewer.fireOpen(StructuredViewer.java:818)
	at org.eclipse.jface.viewers.StructuredViewer.handleOpen(StructuredViewer.java:1079)
	at org.eclipse.jface.viewers.StructuredViewer$6.handleOpen(StructuredViewer.java:1183)
	at org.eclipse.jface.util.OpenStrategy.fireOpenEvent(OpenStrategy.java:263)
	at org.eclipse.jface.util.OpenStrategy.access$2(OpenStrategy.java:257)
	at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:297)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:938)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3682)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3293)
	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2389)
	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2353)
	at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2219)
	at org.eclipse.ui.internal.Workbench$4.run(Workbench.java:466)
	at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:289)
	at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:461)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
	at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:106)
	at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:169)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:106)
	at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:76)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:363)
	at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:176)
	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.eclipse.equinox.launcher.Main.invokeFramework(Main.java:508)
	at org.eclipse.equinox.launcher.Main.basicRun(Main.java:447)
	at org.eclipse.equinox.launcher.Main.run(Main.java:1173)
	at org.eclipse.equinox.launcher.Main.main(Main.java:1148)

       开始以为是网上所说的依赖关系的问题，但是按网上的说法尝试很久无果啊。后来发现，问题处在插件项目的plugin.xml的built.properties中缺少了source，添加之后问题解决。

 

再附上built.properties的代码吧，很简单，但是很重要，改天研究一下这个文件。

 

source.. = src/
output.. = bin/
bin.includes = .,\
                 plugin.xml,\
                 META-INF/

 

 

评论

2 楼 min12605 2008-10-22  

lggege 写道

EMF 我还不会呢, 一直也只是知道, 看来要用EMF来建模, 来改造我原有的GEF项目了. 手写模型确实太抽象了.

我也是按着八进制的教学学习的，也完全是个新手，但是从目前来看，将模型和表示分开成两个插件项目后，对模型的修改对GEF部分产生影响比较小，而且修改方便，修改模型的UML图之后自动就可以生成代码了，感觉还不错

1 楼 lggege 2008-10-16  

EMF 我还不会呢, 一直也只是知道, 看来要用EMF来建模, 来改造我原有的GEF项目了. 手写模型确实太抽象了.