Why is Intellij showing a cross (x) over the class icon for one of my Java classes?

The icon that IntelliJ (v11.1) usually shows next to Java classes is a blue circle with a C. But for one of my classes this icon has a small "x" in the top left corner. This particular class is in a package with another class, which has just the usual C in a blue circle.

In case it matters, I'm using a Mac.

The class in question is AlertsHandler.

enter image description here

Why I Cannot run Java file in IntelliJ?

Be sure that you have the module for the project set to the Java JDK. Otherwise, try putting a break point on the only executable line in the code and enter debug mode.

Why are my Java files orange IntelliJ?

It means those files aren't part of the project settings. Show activity on this post. mark the java folder as source root.It will solve.

This icon shows that the class is excluded from the compilation, it can be changed in Settings (Preferences on Mac) | Compiler | Excludes.