SuppressWarnings “all” complaint from Eclipse

Question

What is wrong with the SuppressWarnings annotation above the if statement? Eclipse with Sun JDK 6 provides two syntax error descriptions, both unhelpful and hard to understand, shown in comments.

class TestDeadCode
{
    //@SuppressWarnings("all")
    public static void main(String[] args)
    {
        @SuppressWarnings("all")  // syntax errors: insert enum body, insert enum id
        if ((Constants.flag0) && (Constants.flag1))
            System.out.println("hello\n");      
    }
}

interface Constants
{
    boolean flag0 = false;
    boolean flag1 = false;
}

Answer 1

Only classes, methods, variable declarations, parameters and packages may be annotated. Therefore, you cannot use SuppressWarnings("all") on an if statement.

To fix this issue, you can simply do the following.

@SuppressWarnings("all")
boolean flag = Constants.flag0 && Constants.flag1;
if (flag) {
    System.out.println("hello\n");
}

There is no SuppressWarnings("Dead code") as of yet.

http://docs.oracle.com/javase/7/docs/api/java/lang/SuppressWarnings.html http://pmd.sourceforge.net/suppressing.html