[ http://issues.apache.org/jira/brows...237
6724 ]

Nikolay Ugarov commented on DIRSERVER-391:
------------------------------------------

Alex,

I have the stacktrace in my project (not related to ApacheDS in any way) exa
ctly similar to the one you have on server -   actually found this bug searc
hing the net for the stacktrace.

It looks like this is sun's bug. http://bugs.sun.com/bugdatabase/vie...r />
d=4729342

Could you please comment, did you upgrade your JDK when when you where testi
ng the resolution?

> Loop in client results in NPE + CommunicationException Request: 1 cancelle
d
> --------------------------------------------------------------------------
-
>
>          Key: DIRSERVER-391
>          URL: http://issues.apache.org/jira/browse/DIRSERVER-391
>      Project: Directory ApacheDS
>         Type: Bug

>  Environment: Windows XP SP2, JDK1.4.2_05, Running the program in Eclipse 
3.0.1
>     Reporter: David Geleyn
>     Assignee: Alex Karasulu
>  Attachments: Test.java
>
> The source code that fails is too complicated to add here, so I've made a 
test program that results in the same behaviour.
> This program doesn't do anything useful. It checks twice whether Alex Karasulu is 
an administrator and repeats this for a thousand times. It results in an Communicati
onException at client side and a NPE at server  side. I added both stacktraces at th
e e
nd. I also added the code that starts up the LDAP server.
> I googled to find some explanation for the "Request 1: Cancelled", but I d
idn't find an useful explanation. There was some topic on a forum that menti
onned that the number of connections was reached. Can this be the problem?
> After the NPE (which is never a good thing), new server requests will be p
rocessed. It's only the thread that handles the request that fails (i guess)
.
> ============= SAMPLE CLIENT CODE
> public static void main(String[] args) throws Exception
> {
>         final Properties env = new Properties();
>         env.put(Context.INITIAL_CONTEXT_FACTORY,
> "com.sun.jndi.ldap.LdapCtxFactory");
>         env.put(Context.PROVIDER_URL, "ldap://david:389");
>         env.put(Context.SECURITY_AUTHENTICATION, "simple");
>         env.put("java.naming.ldap.version", "3");
>         env.put(Context.SECURITY_PRINCIPAL, "uid=admin,ou=system");
>         env.put(Context.SECURITY_CREDENTIALS, "secret");
>         int positive = 0;
>
>         for (int i = 0; i < 1000; i++)
>         {
>                 // Try to authenticate user.
>                 DirContext userContext = new InitialDirContext(env);
>
>                 final SearchControls constraints = new SearchControls();
>                 constraints.setDerefLinkFlag(true);
>                 constraints.setSearchScope(SearchControls.SUBTREE_SCOPE);
>                 String filter =
> "(& (cn=administrators)(uniqueMember=uid=aka
rasulu,ou=users,ou=system))";
>                 NamingEnumeration enum =
> userContext.search("ou=groups,ou=system", filter, constraints);
>                 enum = userContext.search("ou=groups,ou=system", filter,
> constraints);
>
>                 if (enum.hasMoreElements()) positive++;
>                 userContext.close();
>         }
>         System.out.println(positive);
>
> }
> ============= SERVER STARTUP CODE
> // Start the LDAP server
> Properties env = new Properties();
> env.setProperty(Context.PROVIDER_URL, "ou=system");
> env.setProperty(Context.INITIAL_CONTEXT_FACTORY,
> "org.apache.ldap.server.jndi.ServerContextFactory");
> try
> {
>         new InitialDirContext(env);
> }
> catch (NamingException e)
> {
>         e.printStackTrace();
> }
> ============= CLIENT STACK TRACE
> javax.naming.CommunicationException: Request: 1 cancelled
>         at com.sun.jndi.ldap.LdapRequest.getReplyBer(LdapRequest.java:60)
>         at com.sun.jndi.ldap.Connection.readReply(Connection.java:405)
>         at com.sun.jndi.ldap.LdapClient.ldapBind(LdapClient.java:340)
>         at com.sun.jndi.ldap.LdapClient.authenticate(LdapClient.java:193)
>         at com.sun.jndi.ldap.LdapCtx.connect(LdapCtx.java:2640)
>         at com.sun.jndi.ldap.LdapCtx.<init>(LdapCtx.java:290)
>         at
> com.sun.jndi.ldap.LdapCtxFactory.getUsingURL(LdapCtxFactory.java:175)
>         at
> com.sun.jndi.ldap.LdapCtxFactory.getUsingURLs(LdapCtxFactory.java:193)
>         at
> com.sun.jndi.ldap.LdapCtxFactory.getLdapCtxInstance(LdapCtxFactory.java:13
6)
>         at
> com.sun.jndi.ldap.LdapCtxFactory.getInitialContext(LdapCtxFactory.java:66)
>         at
> javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:662)
>         at
> javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:243)
>         at javax.naming.InitialContext.init(InitialContext.java:219)
>         at javax.naming.InitialContext.<init>(InitialContext.java:195)
>         at
> javax.naming.directory.InitialDirContext.<init>(InitialDirContext.java:80)
>         at id.security.authentication.service.ldap.Test.main(Test.java:34)
> ============= SERVER STACK TRACE
> java.lang.NullPointerException
>         at
> sun.nio.ch.WindowsSelectorImpl$SubSelector.processFDSet(WindowsSelectorImp
l.java:321)
>         at
> sun.nio.ch.WindowsSelectorImpl$SubSelector.processSelectedKeys(WindowsSele
ctorImpl.java:290)
>         at
> sun.nio.ch.WindowsSelectorImpl$SubSelector.access$2800(WindowsSelectorImpl
.java:253)
>         at
> sun.nio.ch.WindowsSelectorImpl.updateSelectedKeys(WindowsSelectorImpl.java
:439)
>         at
> sun.nio.ch.WindowsSelectorImpl.doSelect(WindowsSelectorImpl.java:145)
>         at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:59)
>         at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:70)
>         at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:74)
>         at
> org.apache.apseda.input.TCPInputManager.run(TCPInputManager.java:158)
>         at java.lang.Thread.run(Thread.java:534)

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