When trying to run or debug a Maven project from the IDE, the execution fails with "The command line is too long." error. The reason for that is that the class path will be appended with all the project's dependencies.

Thou there are couple of workarounds for this issue, the root of the problem is in the version of the "exec-maven-plugin" Maven plug-in, that the IDE uses to execute the debugger or the project.

The plug-in is explicitly specified on the command line passed to the system as:
org.codehaus.mojo:exec-maven-plugin:1.1.1:exec, this way even if I have the latest version of this plug-in installed, the IDE will not use it but will use version 1.1.1 instead. 

The above mentioned problem is fixed in the versions 2+ of the exec-maven-plugin.
It could be that a simple update would fix the problem.