Sequence of 2>&1 in sh start script cause exceptions were not log into file, but show on screen.

Content of Hello.java

public class Hello
{
    public static void main(String[] args) throws Exception
    {
        System.out.println("Hello");
        throw new Exception("world");
    }
}

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[billson@virtual-jenkins Documents]$ javac Hello.java; java -cp . Hello 2>&1 > null.txt
Exception in thread "main" java.lang.Exception: world
    at Hello.main(Hello.java:8)

[billson@virtual-jenkins Documents]$ cat null.txt
Hello

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[billson@virtual-jenkins Documents]$ javac Hello.java; java -cp . Hello > null 2>&1

[billson@virtual-jenkins Documents]$ cat null.txt

Hello
Exception in thread "main" java.lang.Exception: world
    at Hello.main(Hello.java:8)