Well Thangaraj we are just kids in front of developers of Java. If java doesn't support anything, then there must be a reason for it. My first post at javaranch was about a problem which I thought was a bug but at last I was proved wrong. When autoboxing was added to java, the developers of java must have thought about thousands of exceptional cases. There must be a specific case which would create problems if Wedening and then boxing was allowed. Let's see if anybody knows such a case. Otherwise it's running as a background
thread in my mind. If I will find any such case, I will definitely tell you.