When trying to run my project as a WebApplication from Eclipse, I have the following error:
[WARN] failed com.google.apphosting.utils.jetty.DevAppEngineWebAppContext#4b903fd{/,D:\Dev\Projects\The Five Orbs\trunk\target\fiveorbs-0.1}: java.lang.NoClassDefFoundError: com/google/inject/servlet/GuiceServletContextListener
[WARN] failed JettyContainerService$ApiProxyHandler#eb4d977: java.lang.NoClassDefFoundError: com/google/inject/servlet/GuiceServletContextListener
[WARN] Error starting handlers
java.lang.NoClassDefFoundError: com/google/inject/servlet/GuiceServletContextListener
The class can be found at compile time though (my custom GuiceServletConfig extends GuiceServletContextListener and compiles properly).
The guice-servlet-3.0.jar library appears both in the project build path and in the classpath of my Web Application Run Configuration in Eclipse.
The Arguments panel of my Run Configuration has the following config:
in Program arguments:
-remoteUI "${gwt_remote_ui_server_port}:${unique_id}" -startupUrl TheFiveOrbs.jsp -logLevel INFO -server com.google.appengine.tools.development.gwt.AppEngineLauncher -port 8888 -codeServerPort 9997 -war "D:\Dev\Projects\The Five Orbs\trunk\target\fiveorbs-0.1" com.fiveorbs.TheFiveOrbs
in VM arguments:
-javaagent:D:\Dev\Programs\appengine-java-sdk\lib\agent\appengine-agent.jar -Xmx512m -Dappengine.sdk.root=D:\Dev\Programs\appengine-java-sdk
When I run mvn gae:run from the command prompt with Maven, everything is fine though - the server starts properly and no exception is shown.
I have been struggling with this issue for a couple of hours, and really cannot fathom why it occurs.
Thanks in advance for any hint you might be able to offer.
Sébastien
guice-servlet-3.0.jar should not be in you launch configuration classpath, it should live in your D:\Dev\Projects\The Five Orbs\trunk\target\fiveorbs-0.1\WEB-INF\lib folder.
Related
When I use maven to run tests with this command it works fine:
mvn test -f "c:\path\to\pom.xml"
But when I run the test using the "Testing Explorer" in vscode, it fails with this error:
java.lang.NoClassDefFoundError: path/to/package/ClassName
at path.to.package.ClassName.TestName(TestFileName.java:15)
Caused by: java.lang.ClassNotFoundException: path.to.package.ClassName
at java.net.URLClassLoader.findClass(URLClassLoader.java:387)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
... 24 more
It appears that the test doesn't find the required dependencies when it runs. However, the required dependencies for the test method are available and I can see them in other folders under the project but not under the target folder.
Perhaps the question is how to specify the class path when running the tests from the vscode Testing Explorer view.
You can try to create a customized test launch configuration in the settings. There you can specify the classpaths to be appended. See: https://github.com/microsoft/vscode-java-test/wiki/Run-with-Configuration
On a remote Windows 10 system sbt failes to start with a NoClassDefFoundError:
C:\WORKBENCH\BPF\my-project>sbt -Djavax.net.ssl.trustStoreType=WINDOWS-ROOT -Dsbt.boot.credentials="C:\WORKBENCH\BPF\my-project\credentials.txt" -Dsbt.boot.directory=C:\WORKBENCH\BPF\.sbt\boot -Dsbt.coursier.home=C:\WORKBENCH\BPF\coursier -v
# Executing command line:
"C:\Program Files (x86)\Java\jre1.8.0_321\bin\java.exe"
-Djavax.net.ssl.trustStore="C:\Program Files (x86)\Java\jre1.8.0_321\lib\security\cacerts"
-Djavax.net.ssl.trustStorePassword=changeit
-Xms1024m
-Xmx1024m
-Xss4M
-XX:ReservedCodeCacheSize=128m
-cp
"C:\Program Files (x86)\sbt\bin\sbt-launch.jar"
xsbt.boot.Boot
-Djavax.net.ssl.trustStoreType=WINDOWS-ROOT
-Dsbt.boot.credentials=C:\WORKBENCH\BPF\my-project\credentials.txt
-Dsbt.boot.directory=C:\WORKBENCH\BPF\.sbt\boot
-Dsbt.coursier.home=C:\WORKBENCH\BPF\coursier
java.lang.ClassCastException: java.lang.NoClassDefFoundError cannot be cast to xsbti.FullReload
at sbt.internal.XMainConfiguration.run(XMainConfiguration.java:59)
at sbt.xMain.run(Main.scala:46)
at xsbt.boot.Launch$.$anonfun$run$1(Launch.scala:149)
at xsbt.boot.Launch$.withContextLoader(Launch.scala:176)
at xsbt.boot.Launch$.run(Launch.scala:149)
at xsbt.boot.Launch$.$anonfun$apply$1(Launch.scala:44)
at xsbt.boot.Launch$.launch(Launch.scala:159)
at xsbt.boot.Launch$.apply(Launch.scala:44)
at xsbt.boot.Launch$.apply(Launch.scala:21)
at xsbt.boot.Boot$.runImpl(Boot.scala:78)
at xsbt.boot.Boot$.run(Boot.scala:73)
at xsbt.boot.Boot$.main(Boot.scala:21)
at xsbt.boot.Boot.main(Boot.scala)
[error] [launcher] error during sbt launcher: java.lang.ClassCastException: java.lang.NoClassDefFoundError cannot be cast to xsbti.FullReload
Tried with different SBT versions (1.6.2, 1.5.8, 1.4.9) by changing project/build.properties): The Stack Trace differs depending on the version, but it is always a NoClassDefFoundError.
The SBT version specified in the project is successfully downloaded by the launcher.
I suspect local file permission problems as cause (e.g. due to security policies) therefore i moved the boot and the coursier cache directory. However, this did not bring the desired success.
Does anyone have an idea what the Problem could be?
(I did not do much findings about it.) In my case i could fix it by changing to appropriate java version. Initially i ran with java 18v mistakenly and then changing to java 11v it worked.
I don't have a real diagnosis or causal explanation, but I did solve a similar problem (identical error message, Linux) by clearing out the sbt cache (the .sbt folder within your user directory).
I use lombok extensively at backend, it's really nice and I hope to integrate it into GWT, so I can take advantage of the magic.
I managed to let gwt-maven-plugin recognize lombok by using the -javaagent:lombok.jar=ECJ vm args to be able to compile successfully, however, I'm not sure how to make it work with GWT super dev mode, as it continues complaining "missing getter method" in my IDE(Intellij IDEA).
Also tried the delombok goal of lombok-maven-plugin but without luck.
Any ideas?
Make sure to delete your workDir before starting gwt:run-codeserver. This directory might contain files from previous (lombok-unaware) compilation attempts.
[INFO] --- gwt-maven-plugin:2.8.0-beta1:run-codeserver (default-cli) # Web ---
[INFO] Turning off precompile in incremental mode.
[INFO] Super Dev Mode starting up
[INFO] workDir: C:\Users\jzaruba\AppData\Local\Temp\gwt-codeserver-1653004051676437159.tmp
This is what my mvn-gwt-codeserver.bat looks like:
call mvn clean dependency:properties gwt:run-codeserver %*
(I added dependency:properties because my gwt-maven-plugin configuration refers to Lombok via project dependency: ${org.projectlombok:lombok:jar}, i.e. no static path.)
And if you don't like launching the codeserver from command line, this is how "VM arguments" in my "GWT Codeserver" launch configuration look like:
-javaagent:path/to/lombok.jar=ECJ
When I try to debug an Errai app in Eclipse, I get the following error:
[WARN] Failed startup of context org.jboss.errai.cdi.server.gwt.JettyLauncher$WebAppContextWithReload#a9acff{/,/home/matthew/git/PressGangCCMSUI/src/main/webapp}
javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter, or in an application resource file: java.naming.factory.initial
How can I fix this?
I don't know the specific cause, but when the project is cleaned, I can't run it in debug mode in Eclipse. To fix that I run the project with
mvn gwt:run
and once that launcher has come up I can then run the project in debug in Eclipse again.
I am just starting with GWT. I use Eclipse and have installed the GWT plugin.
I have followed the directions here Maven GWT 2.0 and Eclipse to set up a GWT project using the gwt-maven-plugin. When I run the Maven goals gwt:compile gwt:run, GWT Development Mode is launched and I can copy the url from it to my browser and view the label.
However, the project has this problem:
Description: The web.xml file does not exist
Resource: WEB-INF
Path: /GWTExample/war
Location: Unknown
Type: Google Web App Problem
If I try to run the project as a Google Web Application, I get this warning:
[WARN] No startup URLs supplied and no plausible ones found -- use -startupUrl
I can get rid of the problem by copying the web.xml to the war directory, but I still get the URL issue when running as a Google Web App.
If I'm using Maven and GWT in Eclipse, should I just ignore the web.xml problem and always run applications in development mode via the Maven goals? Or is there a way to set things so I can run as a Google Web App?
EDIT: Related to the above, is it possible to debug a GWT app running in development mode started by gwt:compile gwt:run? I have added breakpoints to my application but it doesn't stop on them. I'm not sure if it is something I've configured wrong or if it's just not possible.
Update:
In response to Prem's answer...
When I run a compile gwt:run, the web.xml file isn't copied. When I run the install gwt:run, I get this error:
[INFO] --- gwt-maven-plugin:1.2:test (default) # SampleGWT ---
[INFO] using GWT jars from project dependencies : 2.0.4
[INFO] establishing classpath list (scope = test)
[ERROR] java.lang.NoClassDefFoundError: org/codehaus/mojo/gwt/test/MavenTestRunner
[ERROR] Caused by: java.lang.ClassNotFoundException: org.codehaus.mojo.gwt.test.MavenTestRunner
[ERROR] at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
[ERROR] at java.security.AccessController.doPrivileged(Native Method)
[ERROR] at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
[ERROR] at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
[ERROR] at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
[ERROR] at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
[ERROR] Could not find the main class: org.codehaus.mojo.gwt.test.MavenTestRunner. Program will exit.
[ERROR] Exception in thread "main"
I’m guessing that bug http://jira.codehaus.org/browse/MGWT-24 is included in version 1.2 of the gwt-maven-plugin. Normally I wouldn’t run install on a project that builds a war file, but I would expect to at least get past the test phase of the build cycle.
Does anybody have any idea why I would get this error on the install but not the compile goals? Also, should I be expecting either goal to copy the web.xml file from src/main/webapp/WEB-INF/web.xml to the /war directory?
Description: The web.xml file does not exist
gwt-maven-plugin creates a project with 'war' packaging format (it's a web app so no surpirse here). Web.xml for this project will be under 'src/main/webapp' folder which will be copied to the 'war' directory (which is set as the output directory) as part of the 'resources' phase in the maven build life-cycle. You should always use
mvn compile gwt:run
or
mvn install gwt:run
so that resources are copied, all java files are compiled and gwt:compile is also invoked (since it is bound to the 'compile' phase automatically)
[WARN] No startup URLs supplied and no plausible ones found -- use -startupUrl
As per the stackoverflow link you used as reference, only your maven build file is setup with startupUrl. In order for it to work in Eclipse, you must edit the Run Configuration of your project and add the '-statupUrl' command line arguments to the existing arguments in the "Arguments" panel.
However, this is just a warning and it should not stop you from running your GWT application from eclipse. If you are facing the same "web.xml" problem here as well, it could be because you did not compile your project in your IDE before invoking "Run as Web Application". I suggest you to disable "Build Automatically" option for this project and always build it manually and invoke "GWT Compile" and then try "Run as web application"
EDIT: Related to the above, is it possible to debug a GWT app running in development mode started by gwt:compile gwt:run?
In general you must use "Remote Application" debug configuration for remote debugging a process. However I am not sure if it will work for GWT projects.
I got me too this warning:
No startup URLs supplied and no plausible ones found
when I have followed this gwt tutorial
In that screenshot there is no checkbox with "Generate sample code" . In my IDE ( sdk 2.5) it is, so I have unchecked...
It wasn't created any of the server and client packages, I have created the client manually, as the tutorial required. The tutorial until that step doesn't say I must have a server package too. That and his configuration is missing from project.
If you right-click on your project and go to Properties -> Google -> Web Application, your WAR directory might be something like either war or src/main/webapp/WEB-INF/classes.
Change that to src/main/webapp.
Also un-check the box next to "Launch and delploy from this directory..."
That's what fixed this problem for me. It also fixed the "can't find gwt-servlet.jar" problem at the same time.