Develop Reference

Can't run program in command line while using LauncherImpl.launchApplication

I'm doing an application and I recently add a splashscreen with LauncherImpl.launchApplication (as a preloader for my app). Before that I was able to run the program in command line and in eclipse. Now eclipse works fine but no more command line. Here is my problem : Why can ide work but not cmd line ?
I get these errors :
java.lang.reflect.InvocationTargetException
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 com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
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 sun.launcher.LauncherHelper$FXHelper.main(Unknown Source)
Caused by: java.lang.RuntimeException: Exception in Preloader init method
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:896)
at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$154(LauncherImpl.java:182)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException: Location is required.
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3207)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3175)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3148)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3124)
at javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3104)
at javafx.fxml.FXMLLoader.load(FXMLLoader.java:3097)
at view.MainPreloader.init(MainPreloader.java:22)
at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:767)
... 2 more
Exception running application view.MainApp
Moreover eclipse says for LauncherImpl.launchApplication :
Discouraged access: The method 'LauncherImpl.launchApplication(Class, Class, String[])' is not API (restriction on required library 'C:\Program Files\Java\jdk1.8.0_161\jre\lib\ext\jfxrt.jar')
I have never seen such an error before, I found this on internet : Access restriction: The type 'Application' is not API (restriction on required library rt.jar)
But in this example I'm not sure they are using an executable jar. However I have to use one. And with an executable jar, even if I change rules as explained it doesn't work.
Help would be appreciate.
Thank you.

IntelliJ: Removing JDK dependency from Artifact Build

Currently using IntelliJ for an IDE.
I inherited a project, and when I went through to make an artifact, I think the compiler is including my local JDK in the build, meaning that if my JRE and JDK are not the same, the program fails on a java.long.SecurityException because a quick signature check of the versions is run when my bundled "artifact" (the jar) runs.
Does anyone know how to make an artifact not bind to a specific JDK/JRE at build time? This program needs to be end user agnostic/independent.
Any help appreciated and thanks folks.
Here is the exact exception found when running the jar file:
Error: A JNI error has occurred, please check your installation and try again
Exception in thread "main" java.lang.SecurityException: Invalid signature file digest for Manifest main attributes
at java.base/sun.security.util.SignatureFileVerifier.processImpl(Unknown Source)
at java.base/sun.security.util.SignatureFileVerifier.process(Unknown Source)
at java.base/java.util.jar.JarVerifier.processEntry(Unknown Source)
at java.base/java.util.jar.JarVerifier.update(Unknown Source)
at java.base/java.util.jar.JarFile.initializeVerifier(Unknown Source)
at java.base/java.util.jar.JarFile.getInputStream(Unknown Source)
at java.base/jdk.internal.loader.URLClassPath$JarLoader$2.getInputStream(Unknown Source)
at java.base/jdk.internal.loader.Resource.cachedInputStream(Unknown Source)
at java.base/jdk.internal.loader.Resource.getByteBuffer(Unknown Source)
at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass(Unknown Source)
at java.base/jdk.internal.loader.BuiltinClassLoader.findClassOnClassPathOrNull(Unknown Source)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull(Unknown Source)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(Unknown Source)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(Unknown Source)
at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Unknown Source)
at java.base/sun.launcher.LauncherHelper.loadMainClass(Unknown Source)
at java.base/sun.launcher.LauncherHelper.checkAndLoadMain(Unknown Source)

Eclipse gradle plugin error importing project

I'm trying to import a gradle project using the eclipse plugin 'buildship'. At the end of the eclipse import throws this error.
Synchronize Gradle projects with workspace failed due to an error connecting to the Gradle build.
Could not run build action using Gradle distribution
'https://services.gradle.org/distributions/gradle-3.3-bin.zip'.
Could not determine the class-path for class org.gradle.tooling.internal.consumer.connection.InternalBuildActionAdapter.
java.net.URISyntaxException: Illegal character in path at index 16: file:/C:/Eclipse Neon/plugins/org.gradle.toolingapi_3.4.0.v20170220163122.jar
Illegal character in path at index 16: file:/C:/Eclipse Neon/plugins/org.gradle.toolingapi_3.4.0.v20170220163122.jar
org.gradle.tooling.GradleConnectionException: Could not run build action using Gradle distribution 'https://services.gradle.org/distributions/gradle-3.3-bin.zip'.
at org.gradle.tooling.internal.consumer.ExceptionTransformer.transform(ExceptionTransformer.java:55)
at org.gradle.tooling.internal.consumer.ExceptionTransformer.transform(ExceptionTransformer.java:29)
at org.gradle.tooling.internal.consumer.ResultHandlerAdapter.onFailure(ResultHandlerAdapter.java:41)
at org.gradle.tooling.internal.consumer.async.DefaultAsyncConsumerActionExecutor$1$1.run(DefaultAsyncConsumerActionExecutor.java:57)
at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63)
at org.gradle.internal.concurrent.StoppableExecutorImpl$1.run(StoppableExecutorImpl.java:46)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
at org.gradle.tooling.internal.consumer.BlockingResultHandler.getResult(BlockingResultHandler.java:46)
at org.gradle.tooling.internal.consumer.DefaultBuildActionExecuter.run(DefaultBuildActionExecuter.java:48)
at com.gradleware.tooling.toolingclient.internal.DefaultToolingClient.executeAndWait(DefaultToolingClient.java:106)
at com.gradleware.tooling.toolingclient.internal.DefaultBuildActionRequest.executeAndWait(DefaultBuildActionRequest.java:51)
at com.gradleware.tooling.toolingmodel.repository.internal.DefaultModelRepository$13.get(DefaultModelRepository.java:287)
at com.gradleware.tooling.toolingmodel.repository.internal.DefaultModelRepository.executeAndWait(DefaultModelRepository.java:355)
at com.gradleware.tooling.toolingmodel.repository.internal.DefaultModelRepository.access$100(DefaultModelRepository.java:49)
at com.gradleware.tooling.toolingmodel.repository.internal.DefaultModelRepository$14.call(DefaultModelRepository.java:313)
at com.google.common.cache.LocalCache$LocalManualCache$1.load(LocalCache.java:4724)
at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3522)
at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2315)
at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2278)
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2193)
at com.google.common.cache.LocalCache.get(LocalCache.java:3932)
at com.google.common.cache.LocalCache$LocalManualCache.get(LocalCache.java:4721)
at com.gradleware.tooling.toolingmodel.repository.internal.DefaultModelRepository.getFromCache(DefaultModelRepository.java:330)
at com.gradleware.tooling.toolingmodel.repository.internal.DefaultModelRepository.executeRequest(DefaultModelRepository.java:309)
at com.gradleware.tooling.toolingmodel.repository.internal.DefaultModelRepository.executeRequest(DefaultModelRepository.java:280)
at com.gradleware.tooling.toolingmodel.repository.internal.DefaultModelRepository.fetchEclipseGradleProjects(DefaultModelRepository.java:238)
at org.eclipse.buildship.core.workspace.internal.DefaultModelProvider.fetchEclipseGradleProjects(DefaultModelProvider.java:66)
at org.eclipse.buildship.core.workspace.internal.SynchronizeGradleBuildsJob.fetchEclipseProjects(SynchronizeGradleBuildsJob.java:87)
at org.eclipse.buildship.core.workspace.internal.SynchronizeGradleBuildsJob.synchronizeBuild(SynchronizeGradleBuildsJob.java:79)
at org.eclipse.buildship.core.workspace.internal.SynchronizeGradleBuildsJob.runToolingApiJob(SynchronizeGradleBuildsJob.java:72)
at org.eclipse.buildship.core.util.progress.ToolingApiJob$1.run(ToolingApiJob.java:73)
at org.eclipse.buildship.core.util.progress.ToolingApiInvoker.invoke(ToolingApiInvoker.java:62)
at org.eclipse.buildship.core.util.progress.ToolingApiJob.run(ToolingApiJob.java:70)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
Caused by: org.gradle.api.GradleException: Could not determine the class-path for class org.gradle.tooling.internal.consumer.connection.InternalBuildActionAdapter.
at org.gradle.tooling.internal.provider.serialization.ClasspathInferer.find(ClasspathInferer.java:143)
at org.gradle.tooling.internal.provider.serialization.ClasspathInferer.getClassPathFor(ClasspathInferer.java:61)
at org.gradle.tooling.internal.provider.serialization.ClientSidePayloadClassLoaderRegistry$1.visitClass(ClientSidePayloadClassLoaderRegistry.java:78)
at org.gradle.tooling.internal.provider.serialization.WellKnownClassLoaderRegistry$1.visitClass(WellKnownClassLoaderRegistry.java:65)
at org.gradle.tooling.internal.provider.serialization.PayloadSerializerObjectOutputStream.writeClassLoader(PayloadSerializerObjectOutputStream.java:63)
at org.gradle.tooling.internal.provider.serialization.PayloadSerializerObjectOutputStream.writeClass(PayloadSerializerObjectOutputStream.java:55)
at org.gradle.tooling.internal.provider.serialization.PayloadSerializerObjectOutputStream.writeClassDescriptor(PayloadSerializerObjectOutputStream.java:43)
at java.io.ObjectOutputStream.writeNonProxyDesc(Unknown Source)
at java.io.ObjectOutputStream.writeClassDesc(Unknown Source)
at java.io.ObjectOutputStream.writeOrdinaryObject(Unknown Source)
at java.io.ObjectOutputStream.writeObject0(Unknown Source)
at java.io.ObjectOutputStream.writeObject(Unknown Source)
at org.gradle.tooling.internal.provider.serialization.PayloadSerializer.serialize(PayloadSerializer.java:45)
at org.gradle.tooling.internal.provider.ProviderConnection.run(ProviderConnection.java:121)
at org.gradle.tooling.internal.provider.DefaultConnection.run(DefaultConnection.java:208)
at org.gradle.tooling.internal.consumer.connection.CancellableConsumerConnection$CancellableActionRunner.run(CancellableConsumerConnection.java:99)
at org.gradle.tooling.internal.consumer.connection.AbstractConsumerConnection.run(AbstractConsumerConnection.java:62)
at org.gradle.tooling.internal.consumer.DefaultBuildActionExecuter$1.run(DefaultBuildActionExecuter.java:59)
at org.gradle.tooling.internal.consumer.connection.LazyConsumerActionExecutor.run(LazyConsumerActionExecutor.java:79)
at org.gradle.tooling.internal.consumer.connection.CancellableConsumerActionExecutor.run(CancellableConsumerActionExecutor.java:45)
at org.gradle.tooling.internal.consumer.connection.ProgressLoggingConsumerActionExecutor.run(ProgressLoggingConsumerActionExecutor.java:58)
at org.gradle.tooling.internal.consumer.connection.RethrowingErrorsConsumerActionExecutor.run(RethrowingErrorsConsumerActionExecutor.java:38)
at org.gradle.tooling.internal.consumer.async.DefaultAsyncConsumerActionExecutor$1$1.run(DefaultAsyncConsumerActionExecutor.java:55)
at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:63)
at org.gradle.internal.concurrent.StoppableExecutorImpl$1.run(StoppableExecutorImpl.java:46)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: org.gradle.internal.UncheckedException: java.net.URISyntaxException: Illegal character in path at index 16: file:/C:/Eclipse Neon/plugins/org.gradle.toolingapi_3.4.0.v20170220163122.jar
at org.gradle.internal.UncheckedException.throwAsUncheckedException(UncheckedException.java:45)
at org.gradle.internal.classloader.ClasspathUtil.getClasspathForClass(ClasspathUtil.java:88)
at org.gradle.tooling.internal.provider.serialization.ClasspathInferer.find(ClasspathInferer.java:92)
... 27 more
Caused by: java.net.URISyntaxException: Illegal character in path at index 16: file:/C:/Eclipse Neon/plugins/org.gradle.toolingapi_3.4.0.v20170220163122.jar
at java.net.URI$Parser.fail(Unknown Source)
at java.net.URI$Parser.checkChars(Unknown Source)
at java.net.URI$Parser.parseHierarchical(Unknown Source)
at java.net.URI$Parser.parse(Unknown Source)
at java.net.URI.<init>(Unknown Source)
at java.net.URL.toURI(Unknown Source)
at org.gradle.internal.classloader.ClasspathUtil.getClasspathForClass(ClasspathUtil.java:74)
... 28 more
Before importing project on eclipse I execute the 'gradle eclipse' command and everything goes well.
What I could do?
Thanks.

There was a bug in Gradle up to Version 3.4(?), where spaces within the build path were not allowed
https://github.com/gradle/gradle/issues/1180
Because your build path contains a space because of "Eclipse Neon" it will fail.
Suggestions:
Either update to the latest version
or try to prevent the error by moving your eclipse neon installation so the path does not include spaces

Apache Tomcat home page not coming

I installed Apache server (Tomcat 7.63) on client machine (Window 7 system 32 bit), The Java version used in client machine is (JDK 1.8 update 60)
Problem
Tomcat server is started by running the file (...\bin\Tomcat7.exe). But when I tried to open the home page (http://localhost:8080/) it is not coming on browser and I can see the following exception on Apache log:
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler process
SEVERE: Error reading request, ignored
java.lang.ExceptionInInitializerError
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at sun.nio.cs.AbstractCharsetProvider.lookup(Unknown Source)
at sun.nio.cs.AbstractCharsetProvider.access$000(Unknown Source)
at sun.nio.cs.AbstractCharsetProvider$1.next(Unknown Source)
at sun.nio.cs.AbstractCharsetProvider$1.next(Unknown Source)
at java.nio.charset.Charset.put(Unknown Source)
at java.nio.charset.Charset.access$200(Unknown Source)
at java.nio.charset.Charset$3.run(Unknown Source)
at java.nio.charset.Charset$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.nio.charset.Charset.availableCharsets(Unknown Source)
at org.apache.tomcat.util.buf.B2CConverter.<clinit>(B2CConverter.java:51
)
at org.apache.tomcat.util.buf.ByteChunk.<clinit>(ByteChunk.java:102)
at org.apache.tomcat.util.buf.MessageBytes.<init>(MessageBytes.java:58)
at org.apache.tomcat.util.buf.MessageBytes.<init>(MessageBytes.java:36)
at org.apache.tomcat.util.buf.MessageBytes$MessageBytesFactory.newInstan
ce(MessageBytes.java:685)
at org.apache.tomcat.util.buf.MessageBytes.newInstance(MessageBytes.java
:78)
at org.apache.coyote.Request.<init>(Request.java:83)
at org.apache.coyote.AbstractProcessor.<init>(AbstractProcessor.java:61)
at org.apache.coyote.http11.AbstractHttp11Processor.<init>(AbstractHttp1
1Processor.java:273)
at org.apache.coyote.http11.Http11Processor.<init>(Http11Processor.java:
56)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.creat
eProcessor(Http11Protocol.java:165)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.creat
eProcessor(Http11Protocol.java:103)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(
AbstractProtocol.java:586)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoin
t.java:316)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskTh
read.java:61)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NullPointerException
at sun.nio.cs.CharsetMapping.load(Unknown Source)
at sun.nio.cs.CharsetMapping$1.run(Unknown Source)
at sun.nio.cs.CharsetMapping$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.nio.cs.CharsetMapping.get(Unknown Source)
at sun.nio.cs.ext.SJIS_0213$1.run(Unknown Source)
at sun.nio.cs.ext.SJIS_0213$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at sun.nio.cs.ext.SJIS_0213.<clinit>(Unknown Source)
... 30 more
Exception in thread "http-bio-8085-exec-1" java.lang.NullPointerException
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(
AbstractProtocol.java:731)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoin
t.java:316)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskTh
read.java:61)
at java.lang.Thread.run(Unknown Source)
What is really weird to me that if I start Apache server from Services Management Console from the administrator account: Administrative Tools -> Services , it is working fine and I can see that the home page (http://localhost:8080/) is coming on browser.
Question
Why Apache home page is not coming if we run Apache server using the .exe file (...\bin\Tomcat7.exe) ? Why the home page is coming if the server started using Windows service ? In both cases the same .exe file is execute to run the server, what is the difference between the two cases ?

Tomcat cannot be started by using the exe directly (unless the correct parameters are supplied), you should use one of the included .bat files if you want to do that: startup.bat
Just be sure to define your environment variables, such as JAVA_HOME, and/or JRE_HOME

An error has occurred when create servlet finished?

I got this error when created a new Servlet in Eclipse :
java.lang.Error: Unresolved compilation problems:
The import org.eclipse.jst.j2ee.internal cannot be resolved
CreateServletTemplateModel cannot be resolved to a type
CreateServletTemplateModel cannot be resolved to a type
at org.eclipse.jst.j2ee.web.ServletTemplate.<init>(ServletTemplate.java:3)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at java.lang.Class.newInstance0(Unknown Source)
at java.lang.Class.newInstance(Unknown Source)
at org.eclipse.emf.codegen.jet.JETEmitter.setMethod(JETEmitter.java:279)
at org.eclipse.jst.j2ee.internal.project.WTPJETEmitter.loadClass(WTPJETEmitter.java:358)
at org.eclipse.jst.j2ee.internal.project.WTPJETEmitter.initialize(WTPJETEmitter.java:231)
at org.eclipse.jst.j2ee.internal.project.WTPJETEmitter.<init>(WTPJETEmitter.java:111)
at org.eclipse.jst.j2ee.internal.web.operations.NewServletClassOperation.generateTemplateSource(NewServletClassOperation.java:351)
at org.eclipse.jst.j2ee.internal.web.operations.NewServletClassOperation.generateUsingTemplates(NewServletClassOperation.java:245)
at org.eclipse.jst.j2ee.internal.web.operations.NewServletClassOperation.doExecute(NewServletClassOperation.java:180)
at org.eclipse.jst.j2ee.internal.web.operations.NewServletClassOperation.execute(NewServletClassOperation.java:423)
at org.eclipse.jst.j2ee.internal.web.operations.AddServletOperation.createServletClass(AddServletOperation.java:144)
at org.eclipse.jst.j2ee.internal.web.operations.AddServletOperation.doExecute(AddServletOperation.java:120)
at org.eclipse.jst.j2ee.internal.web.operations.AddServletOperation$1.run(AddServletOperation.java:426)
at org.eclipse.jst.jee.model.internal.JEE5ModelProvider.modify(JEE5ModelProvider.java:237)
at org.eclipse.jst.j2ee.internal.web.operations.AddServletOperation.execute(AddServletOperation.java:432)
at org.eclipse.wst.common.frameworks.internal.datamodel.DataModelPausibleOperationImpl$1.run(DataModelPausibleOperationImpl.java:376)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1797)
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:211)
at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:369)
at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:313)
at org.eclipse.jface.wizard.WizardDialog.run(WizardDialog.java:934)
at org.eclipse.wst.common.frameworks.internal.datamodel.ui.DataModelWizard.runOperations(DataModelWizard.java:220)
at org.eclipse.wst.common.frameworks.internal.datamodel.ui.DataModelWizard.performFinish(DataModelWizard.java:178)
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:618)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:227)
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.jface.window.Window.runEventLoop(Window.java:820)
at org.eclipse.jface.window.Window.open(Window.java:796)
at org.eclipse.ui.actions.NewWizardAction.run(NewWizardAction.java:182)
at org.eclipse.jface.action.Action.runWithEvent(Action.java:498)
at org.eclipse.jface.action.ActionContributionItem.handleWidgetSelection(ActionContributionItem.java:546)
at org.eclipse.jface.action.ActionContributionItem.access$2(ActionContributionItem.java:490)
at org.eclipse.jface.action.ActionContributionItem$5.handleEvent(ActionContributionItem.java:402)
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)
I'm currently using java 1.6.0_32, Tomcat 7.0.27 and Eclipse Europa.
How could I solve this error?

May be your Eclipse installation has a problem. Try to re-install WTP or get new eclipse.

I had the similar problem.I am using the eclipse-Kepler-sr2-javaEE.
The Issues was in Tomcat-7 server. I deleted the server from project-explorer and also from Windows->preferences->server->Runtime Environment.
Finally I am able to create the Servlet.