Upsource comes with a built-in static analysis engine. It supports Java projects that use Intellij Idea, Maven, or Gradle as they build system. The static inspections detect serious compiler and runtime errors as well as less severe issues like typos or dead code, and instantly provide you with detailed information on each occurrence.
The validation side bar to the right displays a green, red or yellow box on its top depending on whether the code:
This bar also displays active red and yellow navigation stripes that let you jump exactly to the erroneous code and show you details on each error or warning: