Confusing help message with compiler API.

<src>
import java.util.Arrays;
import javax.tools.*;

public class T6423003 {
    public static void main(String... arg) throws Throwable {
        JavaCompiler javac = ToolProvider.getSystemJavaCompiler();
        javac.getTask(null, null, null, Arrays.asList("-Xlint:all"), null, null).call();
    }
}
</src>
output of the message:
<output>
bash-3.00$ java T6423003
javacTask: no source files
^^^^^^^^^
Usage: javacTask <options> <source files>
use -help for a list of possible options
</output>

There is some inconsistency between running through command line and running through compiler API also javacTask will be confusing to the user since its more of internal name.