The Custom Visualization Component has changed in 6.0.1. To get a working starting point do this: File -> New -> Other, then select Jaspersoft Studio -> Custom Visualization Component. Click Next, choose one of the provided samples, give it a name, and click through the rest. You should now have a new project in your workspace with one jrxml and several Javascript and maybe some CSS files. To preview the jrxml you need to compile everything first. For that, right-click on "build.js" and select "Build Component". Then preview the report. You have to compile every time you change something in the Javascript. Once you have this running, you can put in your own code.