JDK-4778099 : (se) Selector.selectedKeys() should allow removal but not addition
  • Type: Bug
  • Component: core-libs
  • Sub-Component: java.nio
  • Affected Version: 1.4.2,5.0
  • Priority: P3
  • Status: Closed
  • Resolution: Fixed
  • OS: generic,solaris_2.6
  • CPU: generic,sparc
  • Submitted: 2002-11-13
  • Updated: 2004-09-01
  • Resolved: 2003-12-19
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5.0 b32Fixed
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Name: auR10023			Date: 11/13/2002

java.nio.channels.Selector.selectedKeys().add() doesn't throw 

Javadoc for Selector.selectedKeys() method states:

Keys may be removed from, but not directly added to, the selected-key set. Any attempt to add an object to the key set will cause an UnsupportedOperationException to be thrown.

Here is the example:


import java.io.*;
import java.nio.*;
import java.nio.channels.*;

public class test  {
    public static void main(String args[]) {
        DatagramChannel channel = null;
        Selector sel = null;
        SelectionKey key = null;
        try {
            channel = DatagramChannel.open();
            sel = Selector.open();

            key = channel.register(
            sel, SelectionKey.OP_WRITE);
        } catch (IOException e) {
            System.out.println("Unexpected IOException");

        try {
            System.out.println("UnsupportedOperationException should be " +
        } catch (UnsupportedOperationException e) {

Here is the result
#java -version
java version "1.4.2-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2-beta-b06)
Java HotSpot(TM) Client VM (build 1.4.2-beta-b06, mixed mode)

#java test
UnsupportedOperationException should be thrown


CONVERTED DATA BugTraq+ Release Management Values COMMIT TO FIX: tiger tiger-beta FIXED IN: tiger-beta INTEGRATED IN: tiger-b32 tiger-beta VERIFIED IN: tiger-b63

EVALUATION A selector's selected-key set should allow removal but not addition. The add and addAll methods should throw UnsupportedOperationException. -- ###@###.### 2002/11/15
181-10-11 0