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There are several reasons for a method not to have a method body:

 It is an unintentional omission, and should be fixed to prevent an unexpected behavior in production.
 It is not yet, or never will be, supported. In this case an [UnsupportedOperationException|NotSupportedException|IllegalOperationError] should be thrown.
 The method is an intentionally-blank override. In this case a nested comment should explain the reason for the blank override.

Noncompliant Code Example

public void doSomething() {
}

public void doSomethingElse() {
}

Compliant Solution

@Override
public void doSomething() {
  // Do nothing because of X and Y.
}

@Override
public void doSomethingElse() {
  throw new UnsupportedOperationException();
}

Exceptions

An abstract class' may have empty methods, in order to provide default implementations for child classes.
public abstract class Animal {
  void speak() {
  }
}