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  1. JDK
  2. JDK-4778099

(se) Selector.selectedKeys() should allow removal but not addition

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    • Subcomponent:
    • Resolved In Build:
      b32
    • CPU:
      generic, sparc
    • OS:
      generic, solaris_2.6
    • Verification:
      Verified

      Description



      Name: auR10023 Date: 11/13/2002



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

      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:

      -------test.java---------

      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();
                  channel.configureBlocking(false);
                  sel = Selector.open();

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

              try {
                  sel.selectedKeys().add(key);
                  System.out.println("UnsupportedOperationException should be " +
                                     "thrown");
                  return;
              } catch (UnsupportedOperationException e) {
              }
              System.out.println("OKAY");
          }
      }

      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

      ======================================================================

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              Assignee:
              mr Mark Reinhold
              Reporter:
              avusunw Avu Avu (Inactive)
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