Develop Reference

Maven Eclipse Debugging

I created simple hello world program with Maven and Eclipse. I can Run and Debug as Java application. I was able to create configuration under Create,Manage,Run > Java Application as Helloworld. Within this configuration I could assign Project and class.
I have existing Maven project in Eclipse. This is significantly different. It does not appear with Package Explorer as a Maven or Java project, as it does not show any packages /src/main/java but as file folders (no icons for Maven or Java next to file folders).
When I click and attempt to configure this under Create,Manage,Run > Java Application, I am not able to browse to project or classes.
How would one go about Debugging this Maven project in Eclipse?
Project does have Create,Manage,Run > Maven Build configured. Compiles into Jar fine and pulls in necessary libraries with dependent pom XML.

I guess Eclipse does not know, that your Maven project is a Maven project.
You can change this as follows:
Right click with mouse on your project => "Configure" => "Convert to Maven Project"
This should trigger automatically a build and then you should see the Java and Maven icons.

How to run maven project on jetty in Intellij as in Eclipse?

Maven project (project name: english) [vaadin, jetty] runs in Eclipse without any problem. How to run/configure exactly the same project in Intellij? Run/Apply options are not available after below configuration. In Eclipse I set, Base directory [${workspace_loc:/english}], Goals [jetty:run], JRE, Source (english project). How to set it in Intellij?
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First things first, you need to add jetty plugin for maven as a dependency, if you don't have it already in your pom.xml. More about jetty maven plugin can be found here
If you were running the project via embedded jetty plugin in eclipse, same pom.xml configuration should run successfully run when you issue same command in intellij IDE.
If there are any issues on your build, try with a "clean rebuild" before you start doing anything else. You can do that via the following command in your terminal:
mvn clean install jetty:run
You will need access your console (terminal), i.e. via Alt + F12 keys. You also need to be in the same directory that you have the pom.xml in your project.
The command will basically clean up (i.e. delete) previously build project and do a fresh rebuild of your project, then run it via embedded jetty plugin.
Be sure to read a brief introduction to maven commands: Maven in 5 minutes if needed.
After you successfully issued this command for the first time, I think you can can also issue jetty:run via View -> Tool windows -> maven project.
You can usually access it also on your right side of intellij IDE (the "m" icon, maven projects).

upload maven project file on save to google app engine like netbeans

I am new to eclipse and spring maven projects, I want to auto upload files whenever changes are made to it. I am using google app engine, I want to upload files on google app engine, like in netbeans, it sync file with server whenever changes are made.
Please Help.
Thanks

The new Cloud Tools for Eclipse doesn't support this directly. And to be honest, it's not an approach I'd recommend: it's better to launch and debug it locally (Debug As > App Engine Standard) and then use Deploy to deploy your working version.
That said, providing you use an external build tool like Maven, you could add your own builder to build and deploy your war on each build. To do so:
Right-click on your project and select Properties
Navigate to the Builders tab.
Select New… and select the Program configuration type
In the Edit Configuration dialog:
the Location is the path to your program (mvn)
the Working Directory would be the location of your project; use the Browse Workspace… button to select your project
the Arguments will be package appengine:deploy
Then switch to the Build Options tab and you'll like wan to add During auto builds too, to cause the action to happen on save.
All of this assumes your pom.xml is properly configured. See the Maven and App Engine Plugin page for details. You could use Gradle too with the same approach.

Managing Maven project in Eclipse with git repository

we recently migrated to Maven Build manager & git hub repository for our Java web-app. Also i switched to eclipse as eclipse has good set of plugins.
As a new bie, i am simply running mvn clean package from terminal at the code root directory. And then moving the compiled code i.e., /target/SNAPSHOT/* to tomcat/webapps/ROOT location.
And then starting Tomcat7 server. The process is time taking especially when i do code changes in Java & configuration .xml files.
I want to do it completely in IDE environment as i did earlier in Netbeans, update code -> build and run in debug mode, -> do code changes and then commit.
Heard of egit & m2e in eclipse for maven & github integration, but not sure how to use it.
Please walk me through the steps required in doing so. I am completely new to eclipse.
--
Thanks

You might want to consider using maven-jetty-plugin http://docs.codehaus.org/display/JETTY/Maven+Jetty+Plugin for running the webapp. You will not need to copy over stuff to tomcat. After configuring this plugin, you can simply run your application by doing mvn jetty:run
I generally do not like running webapps inside Eclipse. It's a personal prefrence, but it is always nice to have an IDE neutral way of building and running your applications. If you have m2e things should work simply fine. I have seen maven-jetty-plugin having hot pluggability where if you changed your web.xml, jetty would reload your application.

We use Git for version control and Maven for dependency management and build automation. Once your project has successfully imported into Eclipse and recognized as a valid java web project, you don't need either Git or Maven in order to build/run it inside IDE. Just creat a server using you existing tomcat installation, add the project to server, then select Run as > Run on Server.
The Complete Guide:
Creating a server
Adding projects to a server
Starting a server
For more details, check out Testing and publishing on your server.

Problem with running Maven GWT application in Eclipse

I'm trying to create a GWT project through WebAppCreator enabled Maven2.
Project creation steps:
Create project with WebAppCreator (i'm using gwt-2.3.0) ->webAppCreator -noant -maven -XnoEclipse -out MyApp com.example.MyApp
Import project as existing maven project in eclipse (helios)
Enable "Project" -> "Properties" -> "Google" -> "Google web toolkit" -> "Use google web toolkit" checkbox
Set in project properties "Google" -> "Web application" -> "This project has a WAR directory". Set WAR directory path "src/main/webapp" and uncheck "launch and deploy from this directory"
Java build path is "MyApp/target/www/WEB-INF/classes"
I did not change the settings in pom.xml
Compile project using gwt eclipse plugin (2.3.0 version). It successfully compiled.
Try to run project as Web Application. When i run application GWT plugin does not ask me about WAR folder.
I did all this, I saw in the logs:
[WARN] Server class 'com.example.server.GreetingServiceImpl' could not be found in the web app, but was found on the system classpath
[WARN] Adding classpath entry 'file:/home/redfox/workspace/java/redfox/MyApp/target/www/WEB-INF/classes/' to the web app classpath for this session
[WARN] Server class 'com.google.gwt.user.client.rpc.RemoteService' could not be found in the web app, but was found on the system classpath
[WARN] Adding classpath entry 'file:/home/redfox/.m2/repository/com/google/gwt/gwt-servlet/2.3.0/gwt-servlet-2.3.0.jar' to the web app classpath for this session
And when i try to load page from URL (http://127.0.0.1:8888/MyApp.html?gwt.codesvr=127.0.0.1:9997) i see 404 error.
In logs i don't see any errors. How can i run this default application? Also i have another question: if this problev will be solved, how can i run this application in web mode (not in development mode) for using links like "http://127.0.0.1:8888" whithout param gwt.codesvr?
P.S. Sorry for my bad English.

I understand your frustration, trust me, I recently went through exactly the same issue you having now.
As Eugene indicated, follow his instructions, but...
On the Select an Archetype choose version 2.3.0-1 (Others may work but this one works for me)
Generate your sample app using theat Archtype version. Do a mvn gwt:run, you will see this screen (If all goes well)
Click on "Launch Default Browser".
Good luck.
Cheers
PB

I know this question is two years old. But i just had the same issue and now figured out how to fix it.
When eclipse doesn't ask you at the first launch for your "WAR" directory, you can also set it manually:
In eclipse go to "Run" -> "Debug Configuration...". Select your "Web Application" -> Select the "Arguments"-Tab and add the parameter e.g. "-war C:\YourProjectPath\target\YourProject-1.0-SNAPSHOT". Provide the full path here pointing to your target, generated by maven.
Hope that helps someone solving this issue faster :)

I know this is old, but here is my latest approach (as also answered here)
I can't speak for the webAppCreator because I haven't used it, but I have had good luck creating the Maven projects in Eclipse using the gwt-maven-plugin from codehause.
Creating a Maven GWT Project Directy in Eclipse
Open the new project wizard in Eclipse and filter on Maven Project.
Select the Maven Project and click next.
Enter the project location of your preference and click next.
Enter "gwt-" into the archetype filter and select the gwt-maven-plugin from codehaus. Click Next.
Enter your maven project details and a module value, then click Finish.
This will create a maven - gwt project for you in Eclipse. This comes with a sample application that you can use to make sure you can launch the application correctly.
Running the Application Command Line
Open command line.
Navigate to your project home.
Run the command "mvn clean package".
Run the command "mvn gwt:run"
This should get you up and running. If you used the 2.7.0 gwt-maven-plugin this should run the application in super dev mode by default.
Run the application in Eclipse
As you have done, navigate to Properties > Google > Web Application and check "This project has a WAR directory". The WAR directory using this plugin should be src/main/webapp.
Navigate to Properties > Google > Web Toolkit and check "This project has a WAR directory. You may be able to specify the module here. I am actually unable to do so, it may be specific to my Google Plugin for Eclipse or something environment specific...
Run As > Web Application.
If you had issues, as I have had, in step 2 then you will get an error Missing required argument 'module[s]'. To fix this open up your run configuration (should have been auto created) and in the arguments tab add the package qualified name for your module at the end of the arguments, e.g. com.mycompany.abc.GwtSampleModule. Do not add the ".gwt.xml" prefix.
It's worth also checking that the HTML page referenced in your arguments is correct, I have also had issues with that.
The application should now be configured for Launch in Eclipse using this run configuration. My verified environment is:
Eclipse Luna (v4.4)
Google Plugin for Eclipse (v3.8)
GWT Maven Plugin (v2.7.0)

What I suggest may start slightly different than you prefer but with better results :)
Install m2eclipse plugin. This will add a lot of nice maven features to your environment.
Using new project wizard create new Maven project
Do not select "simple project" check box, instead use the one of GWT archetypes (I suggest gwt-maven-plugin)
Then appropriate project structure with all required dependencies will be created for you by maven. More info about GWT plugin can be found at http://mojo.codehaus.org/gwt-maven-plugin/user-guide/archetype.html, including on how to execute it.
P.S. Your English is fine :)