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Date:      Fri, 24 Feb 2006 03:47:40 +0300
From:      Serge Baranov <serge@jetbrains.com>
To:        freebsd-java@freebsd.org.
Subject:   NullPointerException in Charset.java:493
Message-ID:  <1757973988.20060224034740@jetbrains.com>
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Hello All,

The following exception is thrown when calling:
Charset.availableCharsets() JDK method.

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
        at java.nio.charset.Charset.put(Charset.java:493)
        at java.nio.charset.Charset.access$300(Charset.java:240)
        at java.nio.charset.Charset$4.run(Charset.java:529)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.nio.charset.Charset.availableCharsets(Charset.java:525)

It has been already discussed:
http://lists.freebsd.org/mailman/htdig/freebsd-java/2005-September/004339.html
but the problem still exists.

Here is the test case that will reproduce the problem:

import java.nio.charset.Charset;
import java.util.Iterator;
import java.util.Set;

public class TestCase {
  public static void main(String[] args) {
    Set set = Charset.availableCharsets().keySet();
    for (Iterator iterator = set.iterator(); iterator.hasNext();) {
      String s = (String) iterator.next();
      System.out.println(s);
    }
  }
}

Save into TestCase.java
Compile: javac TestCase.java
Run: java TestCase

Expected result: list of available charsets printed.
Actual result: NPE is thrown at java.nio.charset.Charset.put(Charset.java:493)

For some reason there is null charset returned at this point:
Charset cs = (Charset)i.next();

Suggested fix: either add a null check as per Dan Cojocar reply or
investigate why null appears there and fix it on the earlier stage.

Fixing this bug is very important, since it breaks functionality of
almost any Java application that operates charsets (like IntelliJ IDEA).

System information:

$ java -version
java version "1.5.0-p2"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-p2-root_23_feb_2006_08_02)
Java HotSpot(TM) Client VM (build 1.5.0-p2-root_23_feb_2006_08_02, mixed mode)
6.1-PRERELEASE i386

P.S. I'm not subscribed to this list, put my address in CC field when
replying.


Serge Baranov
JetBrains, Inc
http://www.jetbrains.com
"Develop with pleasure!"

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