To use Eclipse with an QWT application:

• change to the application directory
• run mvn eclipse:eclipse to generate eclipse files for your application
• start Eclipse
• define a variable M2_REPO pointing to path/to/qwt/installdir/repository (this step is only needed once for all QWT applications).
• choose File/New/Java Project/Create from existing source and select your application directory to open the application in eclipse.

This is the standard procedure to open Maven projects in Eclipse. The only difference is the M2_REPO variable, it points to a different directory because QWT's Maven is configured for a different local repository.