Now, Build the project using Project->Build Project. Right click on the project, and run the FindBugs according to following screenshot.
Now you can see a bug mark on the source code, double click the bug mark, Bug Explorer will be shown ( You can also navigate to Window->Show View->Other->FindBugs->Bug Explorer).
From properties tab, You can get more detailed description about this bug(See the below screenshot).
You can enable properties tab by navigating to Window->Show View->Properties.
FindBugs Helps You To Avoid Bad Code
There is always have possibilities for bugs on agile written code.
Here are some examples in which FindBugs helps you to avoid bad or malicious code.
String str = "Javatips.net ";
public static byte FIND_FLAG = 0;