Error: Could not find or load main class com.google.gwt.dev.Compiler while compiling a GWT project

Question

Whenever I try to compile any of my GWT application the compilation fails with the error message "Error: Could not find or load main class com.google.gwt.dev.Compiler". This problem started after I made some changes to the path and classpath environment variables while installing Tomcat, I don't know whether these changes caused the problem. I tried to reinstall GWT plugin but all in vain. Any help would be greatly appreciated. I am using Eclipse 4.3 and GWT SDK 2.6.0.

Answer 1

Try Run As > Run Configurations, delete the current configuration by clicking on the X top left. Apply and close. Now, Run As > Web application. A default configuration will be created.

If you have any VM arguments, copy them before doing the steps above.

Answer 2

Check things as mentioned in below snapshots:

check whether Main class is having value com.google.gwt.dev.DevMode or not.

Go To Run Configuration >

Go To Project Properties > Build Path

Check whether GWT SDK is installed properly or not

Answer 3

I would recommend creating maven or ant scripts to build outside eclipse.

This way other developers in your team, that maybe don't use eclipse can also build/run the application.

Answer 4

set the "classpath" environment variable = %gwt_installed_dir%