Question

I have a GWT based web application that I have previously uploaded to Appspot.
However now, I am getting this error:

Unable to update:
com.google.appengine.tools.admin.JspCompilationException: Failed to compile jsp files.
    at com.google.appengine.tools.admin.Application.compileJsps(Application.java:583)
    at com.google.appengine.tools.admin.Application.createStagingDirectory(Application.java:434)
    at com.google.appengine.tools.admin.AppAdminImpl.doUpdate(AppAdminImpl.java:327)
    at com.google.appengine.tools.admin.AppAdminImpl.update(AppAdminImpl.java:52)
    at com.google.appengine.eclipse.core.proxy.AppEngineBridgeImpl.deploy(AppEngineBridgeImpl.java:400)
    at com.google.appengine.eclipse.core.deploy.DeployProjectJob.runInWorkspace(DeployProjectJob.java:148)
    at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:38)
    at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)

• The application used JDK (not JRE)
• There’s a JSP file (dummy) on the war file
• The application works in hosted mode

Answer 1

Do a clean build first. Alt+P, N in eclipse. If this fails, delete /war/WEB-INF/classes and try again. If this also fails, right click your war folder and select validate; this will tell you if there are any actual errors in your jsp files.

If this fails, your appengine jars may be corrupted. Try unzipping a fresh SDK and using it to deploy.

Also, have you changed java versions recently? Compiling JSPs requires JAVA_HOME points to a JDK, not a JRE. What is the result of echo $JAVA_HOME?