I have a GAE project in Eclipse that has been working without a problem. I recently upgraded to the Google Cloud SDK 179.0.0 and Eclipse Oxygen.1a Release (4.7.1a) and now, when I open the project, I'm getting build path errors on classes in the javax.servlet.http package. Specifically, the following classes are missing from my project's build path.
javax.servlet.ServletContext
javax.servlet.http.HttpServlet
If you start Eclipse from the console using the following commands (assuming Eclipse is installed in your /Applications folder):
cd /Applications/Eclipse.app/Contents/MacOS
./eclipse
And you watch the terminal window, you'll see a bunch of stack traces similar to the following:
Nov 10, 2017 9:24:57 AM com.google.cloud.tools.eclipse.appengine.localserver.ServletClasspathProvider doResolveClasspathContainer
WARNING: Failed to initialize libraries
org.eclipse.core.runtime.CoreException: Could not resolve artifact com.google.appengine:appengine-api-1.0-sdk:jar:1.9.57
at org.eclipse.m2e.core.internal.embedder.MavenImpl$5.call(MavenImpl.java:776)
at org.eclipse.m2e.core.internal.embedder.MavenImpl$5.call(MavenImpl.java:1)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.executeBare(MavenExecutionContext.java:177)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:151)
at org.eclipse.m2e.core.internal.embedder.MavenExecutionContext.execute(MavenExecutionContext.java:99)
at org.eclipse.m2e.core.internal.embedder.MavenImpl.resolve(MavenImpl.java:743)
at org.eclipse.m2e.core.internal.embedder.MavenImpl.resolve(MavenImpl.java:720)
at com.google.cloud.tools.eclipse.util.MavenUtils.resolveArtifact(MavenUtils.java:69)
at com.google.cloud.tools.eclipse.appengine.libraries.repository.MavenHelper.resolveArtifact(MavenHelper.java:46)
at com.google.cloud.tools.eclipse.appengine.libraries.repository.M2RepositoryService.resolveArtifact(M2RepositoryService.java:50)
at com.google.cloud.tools.eclipse.appengine.libraries.repository.LibraryClasspathContainerResolverService.resolveLibraryFileAttachSourceSync(LibraryClasspathContainerResolverService.java:245)
at com.google.cloud.tools.eclipse.appengine.libraries.repository.LibraryClasspathContainerResolverService.resolveLibraryAttachSourcesSync(LibraryClasspathContainerResolverService.java:106)
at com.google.cloud.tools.eclipse.appengine.localserver.ServletClasspathProvider.doResolveClasspathContainer(ServletClasspathProvider.java:100)
at com.google.cloud.tools.eclipse.appengine.localserver.ServletClasspathProvider.resolveClasspathContainer(ServletClasspathProvider.java:79)
at org.eclipse.jst.server.core.RuntimeClasspathProviderDelegate.resolveClasspathContainerImpl(RuntimeClasspathProviderDelegate.java:135)
at org.eclipse.jst.server.core.internal.RuntimeClasspathProviderWrapper.resolveClasspathContainerImpl(RuntimeClasspathProviderWrapper.java:155)
at org.eclipse.jst.server.core.internal.RuntimeClasspathContainer.getClasspathEntries(RuntimeClasspathContainer.java:77)
at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2693)
at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2851)
at org.eclipse.jdt.internal.core.JavaProject.getResolvedClasspath(JavaProject.java:1956)
at org.eclipse.jdt.internal.core.ExternalFolderChange.updateExternalFoldersIfNecessary(ExternalFolderChange.java:39)
at org.eclipse.jdt.internal.core.ChangeClasspathOperation.classpathChanged(ChangeClasspathOperation.java:59)
at org.eclipse.jdt.internal.core.SetContainerOperation.executeOperation(SetContainerOperation.java:111)
at org.eclipse.jdt.internal.core.JavaModelOperation.run(JavaModelOperation.java:724)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2240)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2267)
at org.eclipse.jdt.internal.core.JavaModelOperation.runOperation(JavaModelOperation.java:795)
at org.eclipse.jdt.internal.core.JavaModelManager$10.run(JavaModelManager.java:3001)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2240)
at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2267)
at org.eclipse.jdt.internal.core.JavaModelManager.initializeAllContainers(JavaModelManager.java:3017)
at org.eclipse.jdt.internal.core.JavaModelManager.getClasspathContainer(JavaModelManager.java:2038)
at org.eclipse.jdt.core.JavaCore.getClasspathContainer(JavaCore.java:3497)
at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2687)
at org.eclipse.jdt.internal.core.JavaProject.resolveClasspath(JavaProject.java:2851)
at org.eclipse.jdt.internal.core.JavaProject.getResolvedClasspath(JavaProject.java:1956)
at org.eclipse.jdt.internal.core.DynamicProjectReferences.getDependentProjects(DynamicProjectReferences.java:34)
at org.eclipse.core.internal.resources.ProjectDescription.computeDynamicReferencesForProject(ProjectDescription.java:950)
at org.eclipse.core.internal.resources.ProjectDescription.getAllBuildConfigReferences(ProjectDescription.java:265)
at org.eclipse.core.internal.resources.ProjectDescription.getAllReferences(ProjectDescription.java:221)
at org.eclipse.core.internal.resources.Project.getReferencedProjects(Project.java:469)
at org.eclipse.ui.actions.CloseUnrelatedProjectsAction.buildConnectedComponents(CloseUnrelatedProjectsAction.java:78)
at org.eclipse.ui.actions.CloseUnrelatedProjectsAction.computeRelated(CloseUnrelatedProjectsAction.java:195)
at org.eclipse.ui.actions.CloseUnrelatedProjectsAction.getSelectedResources(CloseUnrelatedProjectsAction.java:211)
at org.eclipse.ui.actions.SelectionListenerAction.selectionIsOfType(SelectionListenerAction.java:240)
at org.eclipse.ui.actions.CloseResourceAction.updateSelection(CloseResourceAction.java:187)
at org.eclipse.ui.actions.BaseSelectionListenerAction.selectionChanged(BaseSelectionListenerAction.java:124)
at org.eclipse.ui.internal.navigator.resources.actions.ResourceMgmtActionProvider.updateActionBars(ResourceMgmtActionProvider.java:254)
at org.eclipse.ui.internal.navigator.resources.actions.ResourceMgmtActionProvider.fillActionBars(ResourceMgmtActionProvider.java:84)
at org.eclipse.ui.navigator.NavigatorActionService$3.run(NavigatorActionService.java:265)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.ui.navigator.NavigatorActionService.fillActionBars(NavigatorActionService.java:258)
at org.eclipse.ui.navigator.CommonNavigatorManager$UpdateActionBarsJob$1.run(CommonNavigatorManager.java:95)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42)
at org.eclipse.ui.navigator.CommonNavigatorManager$UpdateActionBarsJob.runInUIThread(CommonNavigatorManager.java:89)
at org.eclipse.ui.progress.UIJob.lambda$0(UIJob.java:95)
at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:37)
at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:182)
at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:4033)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3700)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1155)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1044)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:153)
at org.eclipse.ui.internal.Workbench.lambda$3(Workbench.java:680)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:336)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:594)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:148)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:151)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:134)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:104)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:388)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:243)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:653)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:590)
at org.eclipse.equinox.launcher.Main.run(Main.java:1499)
Contains: Missing com.google.appengine:appengine-api-1.0-sdk:jar:1.9.57
With the 179.0 version of the Google Cloud SDK installed, I now have App Engine 1.9.59 installed versus 1.9.57.
The Eclipse build path contains the following libraries:
- App Engine Standard Runtime [App Engine Standard Runtime]
- EAR Libraries
- JRE System Library [JavaSE-1.8]
- TestNG
- Web App Libraries
I encounter this same problem with the following Eclipse releases:
- 4.7.0 (Build Id: 20170620-1800)
- 4.7.1a (Build Id: 20171005-1200)
The following is a list of errors my project now has:
- RequestDispatcher cannot be resolved to a type
- The project was not built since its build path is incomplete. Cannot find the class for javax.servlet.ServletContext. Fix the build path then try building this project
- The superclass "javax.servlet.http.HttpServlet" was not found on the Java Build Path
- The type javax.servlet.ServletContext cannot be resolved. It is indirectly referenced from required .class files
Creating a new App Engine Standard Edition project as a Maven project specifies a dependency on the 1.9.57 version of the App Engine API.
<dependency>
<groupId>com.google.appengine</groupId>
<artifactId>appengine-api-1.0-sdk</artifactId>
<version>1.9.57</version>
<scope>provided</scope>
</dependency>
Created issue #2754 for this problem on GitHub under the "GoogleCloudPlatform/google-cloud-eclipse" project.
https://github.com/GoogleCloudPlatform/google-cloud-eclipse/issues/2574
Version Information
- Eclipse Oxygen.1a Release (4.7.1a Build: 20171005-1200)
- Google Cloud Platform for Eclipse 4.5 and later 1.4.1.201710261936
- Google Cloud SDK 179.0.0
- alpha 2017.09.15
- app-engine-java 1.9.59
- app-engine-python 1.9.62
- beta 2017.09.15
- bq 2.0.27
- core 2017.11.06
- gcd-emulator v1beta3-1.0.0
- gcloud
- gsutil 4.28
- kubectl
- pubsub-emulator 2017.09.15
I don't know the exact cause of the problem, but rebooting my computer resolved the problem reported in this bug. In the course of trying to resolve this problem, I did stop and start Eclipse several times in an effort to address the problem. I started new terminal window sessions in an effort to fix the problem, but that didn't work.
After completely rebooting my machine, the problem reported in this bug went away.