I am receiving an NoClassDefFoundError in Eclipse when I try to run my project.
My Project looks like this:
JavaProject: BulkAdmin
- src
- com.mycompany.bulkadmin.SDK.util
- Login.java
Dynamic Web Project: JSPTesting
- src
- com.mycompany.bulkadmin.jspController
- Controller.java
- WebContent
- index.html
- execute.jsp
This is the control flow:
index.html loads
index.html has a form that redirects to execute.jsp
execute.jsp takes the info returned in the form and makes a static call to Login.java
execute.jsp prints the results of the call
Controller.java uses Login.java. I was receiving compilation errors. To resolve them I did this:
Right click on JSPTesting -> properties
Choose java build path on the left bar
Choose projects tab
Click add
Choose BulkAdmin (Project)
I am not sure why but now when I am getting a NoClassDefFoundError. I have done some googling. I think that this means that I have messed up my classpath somehow but I am not sure how to resolve this.
java.lang.NoClassDefFoundError: com/myCompany/bulkadmin/SDK/util/Login
at com.myCompany.bulkadmin.jspController.Controller.process(Controller.java:44)
at org.apache.jsp.execute_jsp._jspService(execute_jsp.java:63)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:98)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:331)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:321)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:257)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:873)
at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
at java.lang.Thread.run(Thread.java:595)
Other information:
I am using tomcat (in Eclipse) as my server
The exception shows up in the browser and the eclipse console
execute.jsp is a JSP
It seems like there are many similar questions to this on SO. I have read about 15 of them and tried various things however I think that my question has a different solution. I can provide more information.
Rightclick your dynamic web project, go to Properties > Deployment Assembly and add the dependent projects there. This way they will end up as JAR in /WEB-INF/lib, exactly there where you want it to be.
In Eclipse versions older than 3.5 you need to go to Properties > Java EE Module Dependencies.
See also:
ClassNotFoundException when using User Libraries in Eclipse build path
Difference between Deployment Assembly and J2EE Module Dependencies in Eclipse
The NoClassDefFoundError indicates that a class that was available during compilation is no longer available at runtime. Your problem is that the com/myCompany/bulkadmin/cSDK/util/Login class is available in the compilation classpath (in Eclipse via the Project reference you added to the build path) but not in the runtime classpath (Tomcat, which has no idea how to find this class).
You need to add the BulkAdmin project to the web-app class path when deployed on Tomcat as well.
One way to do this would be to export the BulkAdmin project as a JAR and put it into the WEB-INF/lib directory of your JSPTesting project.
Related
I have a maven project in Eclipse Java EE IDE for Web Developers.
When running Tomcat, I'm getting an error for a class that I can see that I have included.
My question is - do I have to add these JARs to an additional place because of Tomcat Apache?
Error:
SEVERE: Servlet /Resource threw load() exception
java.lang.ClassNotFoundException: org.odata4j.jersey.producer.resources.ODataApplication
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1714)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1559)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:171)
at com.sun.jersey.core.reflection.ReflectionHelper.classForNameWithException(ReflectionHelper.java:240)
at com.sun.jersey.core.reflection.ReflectionHelper.classForNameWithException(ReflectionHelper.java:220)
at com.sun.jersey.spi.container.servlet.WebComponent.createResourceConfig(WebComponent.java:711)
And here is the class in my Library:
UPDATE:
My Web Deployment Assembly looks like:
The issue you are seeing is due to the fact that tomcat is looking at the wrong directory. It is currently most likely pointed at your src/main/webapp directory of your project. This does not jive with how maven works. Maven downloads the dependencies, but will only include them in the target build. You need to have the tomcat server look at target/myapp-0.0.1, or build to a war and deploy that way. The easiest solution as of now, would be for you to use the tomcat plugin. After setting it up, you can use an imbedded server, and just use the following command 'mvn tomcat:run'.
Maven Tomcat Plugin Docs
UPDATE:
I looked at the properties settings, and you should actually be able to edit the "Web Deployment Assembly" settings for your project (under project properties). Check screenshot for how I have mine setup. Notice how Maven Dependencies is mapped.
http://imgur.com/ofxryns
I am trying use androidVNC open source project as a Library Project in my MainProject. androidVNC has also used ZoomerWithKeys library project. I want start a activity of androidVNC library project in my MainProject by clicking on a Button.
I have done all the basic things like to define all the activity of library project in Manifest of main Project.
The problem is that i am getting following error when trying to running my MainProject -
Dex Loader] Unable to execute dex: Multiple dex files define Lcom/antlersoft/android/zoomer/R$drawable;
[2013-05-16 15:44:03 - OtherProj] Conversion to Dalvik format failed: Unable to execute dex: Multiple dex files define Lcom/antlersoft/android/zoomer/R$drawable;
Thanks in advance.
I resolve this by doing following steps:
Go to bin folder of you app and see which libraries are duplicated(in mine I had 2 supportv4****)
Hold your mouse on them and see where they compile from, keep in mind that you should keep the most important one, so if you are using appcompat and facebookSDK, you should keep that library which comes from appcompat
Go to the properties of the project of the other library (e.g facebookSDK) -> Java build path -> Libraries and delete the dependency in which the buggy lib come from(in mine, supportV4 nested in Android Private Libraries, so I delete it),
Also do it from a file manager, go to our project folder/libs and delete that buggy library if it's not cleaned by default
In that window, after deleting, choose Add Jars... and select the library of the other project(in mine, I choose SupportV4 from appcompat)
Clean you workspace, restart Eclipse
The problem should have gone, these steps work more than fine for me
1).did you added your lib project to the main project?? Make sure..
2).also add the project to your lib project by doing this process--
In the lib project-->>right click on project-->>java build path-->>on the project tab-->>add your main project.
Now build your project..hopefully it will help you.
EDITED::
3). Go to the project properties..edit this(can give some space) and then save..clean project...then build..
I tackled with this kind error in Android Studio.
In my case my main project was using two my own lib. But beside this those two libs were using the same library as external included
compile files('lib/external-lib.jar')
I solved it by doing following in my both own libs.
1)Removing old compile files('lib/external-lib.jar' ) from build.gradle and deleting old external_lib.jar from lib folder.
2)Adding library from jcenter() two my own libs
compile 'external.lib:1.9.2'
3)Rebuild.
Then rebuild and run main project
Then problem has disappeared.
I installed playN however I get this error:
[INFO] --- gwt-maven-plugin:2.4.0:compile (default) # playn-showcase-html ---
[ERROR] Error: Could not find or load main class com.google.gwt.dev.Compiler
I checked the m2 repository, and the gwt jars for 2.4 2.5 gwt seem to be there.
If I try to use GWT 2.5 in the project then I get this
The GWT SDK 'C:\Users\user.m2\repository\com\google\gwt' on the project's build path is not valid (Version is not supported, must be 2.0.0 or later)
playn-showcase-html
Unknown Google Web Toolkit Problem
Does this make sense at all?
How to fix it?
Thanks
It seems that some gwt jars in the maven repository were corrupted. I deleted them, i run the playN sample again, the jars were downloaded correctly, and the whole think worked
C:\Users\user.m2 <-- this is very strange. it looks like somehow your maven repository path is munged up.
Check your environmental variables for MAVEN_REPOSITORY and see if its set to C:\Users\user. Also, find your maven installation directory, and look under the conf directory for a settings.xml, and see if you have <localRepository>${env.MAVEN_REPOSITORY}/.m2/repository</localRepository>.
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.
I have a 'Utilty Project', and an 'EAR Project' that includes that 'Utility Project'. All the classes from the 'Utility Project' end up being packaged as a JAR and placed within the 'lib' directory of the exported EAR, for example:
EAR.ear
META-INF
MANIFEST.MF
lib
utility.jar (which expands to):
META-INF
MANIFEST.MF
com
acme
Foo.class
Bar.class
However, the 'Utility Project' relies on a library (freemarker.jar) that has been added to the build path using 'Properties > Java Build Path > Libraries'. All I want to do is to get freemarker.jar added to the EAR as follows:
EAR.ear
META-INF
MANIFEST.MF
lib
**freemarker.jar**
utility.jar (which expands to):
META-INF
MANIFEST.MF
com
acme
Foo.class
Bar.class
By searching around within Eclipse I've found 4 potential avenues for achieving this, none of which have worked. If someone can just cut to the chase and tell me what I should actually do, that would be great. But just in case, I'll iterate them here:
From the 'Utility Project' Properties:
If I click 'Java Build Path > Order and Export' and select 'freemarker.jar' for export, the jar does not end up in the EAR file at all.
If I click 'Java EE Module Dependencies' and select the 'freemarker.jar' library as a dependency, it says:
This JAR is a bundled library of an
EAR project and is supposed to be
packed in the EAR's library directory.
It conflicts with the manifest class
path dependency you are trying to
create. If you create this dependency,
the JAR will be packed in the root
(not library) directory of the EAR.
Are you sure you want to proceed?
From the 'EAR Project' Properties:
If I click 'Java EE Module Dependencies > Add JARs...' and navigate to the 'freemarker.jar', and make it a dependency, it gets added to the root of the EAR:
/freemarker.jar
If I do the same as above, but check the 'In Lib Dir' checkbox, it gets added into the lib folder, but contained within another lib folder:
/lib/lib/freemarker.jar
Thanks.
I've managed to solve this problem. In the Problems window I was getting the following warning:
Classpath entry /utility-project/lib/freemarker.jar will not be exported or published.
Runtime ClassNotFoundExceptions may result.
What I tried, at a whim, was to use the Ctrl-1 key combination I've been using to get quick fix solutions for my source code. It turns out this also provides quick-fix solutions for for the given errors and warnings. I chose the first of the two options:
Mark the associated raw classpath entry as a publish/export dependency.
and my problem disappeared!
Bizarrely, all this seems to have done is to cause the 'freemarker.jar' lib to be selected in the 'Java EE Module Dependencies' properties dialog, which I was doing myself anyway. This may be an Eclispe bug!
#MonoThreaded: After using the quick fix > Mark the associated raw classpath entry as published/export dependency, if you right-click on the project > properties > depolyment assembly you will notice that eclipse has added a new entry, something like source: /freemaker.jar, deploy path: ../lib. You can do that too, by selecting Add > Java Build Path Entry.