eclipse中无法创建Servlet
创建的时候，发生：java.lang.Error: Unresolved compilation problems:
The import org.eclipse.jst.j2ee.internal cannot be resolved
The import org.eclipse.jst.j2ee.internal cannot be resolved
CreateServletTemplateModel cannot be resolved to a type
CreateServletTemplateModel cannot be resolved to a type
CreateJavaEEArtifactTemplateModel cannot be resolved
CreateServletTemplateModel cannot be resolved
CreateServletTemplateModel cannot be resolved
CreateServletTemplateModel cannot be resolved
Constructor cannot be resolved to a type
Constructor cannot be resolved to a type
Method cannot be resolved to a type
at org.eclipse.jst.j2ee.web.ServletTemplate.<init>(ServletTemplate.java:4)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at java.lang.Class.newInstance0(Class.java:355)
at java.lang.Class.newInstance(Class.java:308)
at org.eclipse.emf.codegen.jet.JETEmitter.setMethod(JETEmitter.java:291)
at org.eclipse.jst.j2ee.internal.project.WTPJETEmitter.loadClass(WTPJETEmitter.java:360)
at org.eclipse.jst.j2ee.internal.project.WTPJETEmitter.initialize(WTPJETEmitter.java:233)
at org.eclipse.jst.j2ee.internal.project.WTPJETEmitter.<init>(WTPJETEmitter.java:113)
at org.eclipse.jst.j2ee.internal.common.operations.NewJavaEEArtifactClassOperation.generateTemplateSource(NewJavaEEArtifactClassOperation.java:159)
at org.eclipse.jst.j2ee.internal.web.operations.NewWebClassOperation.generateUsingTemplates(NewWebClassOperation.java:129)
at org.eclipse.jst.j2ee.internal.common.operations.NewJavaEEArtifactClassOperation.doExecute(NewJavaEEArtifactClassOperation.java:93)
at org.eclipse.jst.j2ee.internal.common.operations.NewJavaEEArtifactClassOperation.execute(NewJavaEEArtifactClassOperation.java:63)
at org.eclipse.jst.j2ee.internal.common.operations.AddJavaEEArtifactOperation.createClass(AddJavaEEArtifactOperation.java:70)
at org.eclipse.jst.j2ee.internal.web.operations.AddWebClassOperation.doExecute(AddWebClassOperation.java:63)
at org.eclipse.jst.j2ee.internal.common.operations.AddJavaEEArtifactOperation$1.run(AddJavaEEArtifactOperation.java:47)
at org.eclipse.jst.j2ee.web.componentcore.util.WebArtifactEdit.modify(WebArtifactEdit.java:667)
at org.eclipse.jst.j2ee.internal.common.operations.AddJavaEEArtifactOperation.execute(AddJavaEEArtifactOperation.java:53)
at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl$1.run(DataModelPausibleOperationImpl.java:376)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1800)
at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.runOperation(DataModelPausibleOperationImpl.java:401)
at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.runOperation(DataModelPausibleOperationImpl.java:352)
at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.doExecute(DataModelPausibleOperationImpl.java:242)
at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.executeImpl(DataModelPausibleOperationImpl.java:214)
at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.cacheThreadAndContinue(DataModelPausibleOperationImpl.java:89)
at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl.execute(DataModelPausibleOperationImpl.java:202)
at org.eclipse.wst.common.frameworks.internal.datamodel.ui.DataModelWizard$1$CatchThrowableRunnableWithProgress.run(DataModelWizard.java:219)
at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:446)
at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:354)
at org.eclipse.jface.wizard.WizardDialog.run(WizardDialog.java:934)
at org.eclipse.wst.common.frameworks.internal.datamodel.ui.DataModelWizard.runOperations(DataModelWizard.java:228)
at org.eclipse.wst.common.frameworks.internal.datamodel.ui.DataModelWizard.performFinish(DataModelWizard.java:186)
at org.eclipse.jface.wizard.WizardDialog.finishPressed(WizardDialog.java:742)
at org.eclipse.jface.wizard.WizardDialog.buttonPressed(WizardDialog.java:373)
at org.eclipse.jface.dialogs.Dialog$2.widgetSelected(Dialog.java:624)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:228)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3823)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3422)
at org.eclipse.jface.window.Window.runEventLoop(Window.java:825)
at org.eclipse.jface.window.Window.open(Window.java:801)
at org.eclipse.ui.internal.handlers.WizardHandler$New.executeHandler(WizardHandler.java:253)
at org.eclipse.ui.internal.handlers.WizardHandler.execute(WizardHandler.java:273)
at org.eclipse.ui.internal.handlers.HandlerProxy.execute(HandlerProxy.java:281)
at org.eclipse.core.commands.Command.executeWithChecks(Command.java:476)
at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:508)
at org.eclipse.ui.internal.handlers.HandlerService.executeCommand(HandlerService.java:169)
at org.eclipse.ui.internal.handlers.SlaveHandlerService.executeCommand(SlaveHandlerService.java:247)
at org.eclipse.ui.internal.actions.CommandAction.runWithEvent(CommandAction.java:157)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:583)
at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:500)
at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:411)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1003)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3823)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3422)
at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2382)
at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2346)
at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2198)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:493)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:288)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:488)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:113)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:193)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:382)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:549)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:504)
at org.eclipse.equinox.launcher.Main.run(Main.java:1236)
我已经将Tomcat目录中lib下的servlet-api.jar复制到JRE的lib目录下，还是建立不了
我用的是apache-tomcat-6.0.29 --------------------编程问答--------------------
可能的原因：
1.对系统所访问外部资源，未执行关闭操作，导致外部资源大量浪费，最终可能导致系统无法正常运行;
2.对系统所访问的外部资源关闭次数太多，外部系统无法正常处理;
3.系统访问的外部资源出现异常情况。
解决方案：
1.访问外部资源前，首先检查该资源(如数据库)是否可正常连接或操作。
2.访问外部资源时，如果进行了连接，一定进行关闭操作，并仅进行一次关闭操作。
3.尽量在同一操作中共享外部资源，以减少该操作对资源的消费，提高程序的执行效率。 --------------------编程问答-------------------- 重启一下 --------------------编程问答-------------------- 做Servlet开发的时候，最好使用3.5以上的Eclipse（JavaEE版）。 --------------------编程问答-------------------- 配了环境变量没啊？ --------------------编程问答-------------------- 第一次听说……重装试试，servlet也是一个类，你类能建，servlet不行？ --------------------编程问答-------------------- 关注下。 --------------------编程问答-------------------- 你的是什么Eclipse,版本不对吧
如果是ee版的,新建web项目时会引用j2ee的库文件
myeclipse也是一样,会要求你指定引用的javaee版本,ide会调用相应的库
或者你自己添加lib路径的话,至少需要
javaee.jar
jsf-impl.jar
jsf-api.jar
jstl-1.2.jar
servlet-api.jar
几个库 --------------------编程问答-------------------- 新建一个类去继承servlet不可以？那不就是以个servlet类了么?
补充：Java , Java EE
