[ http://issues.apache.org/jira/browse/DIRSERVER-391?page=comments#action_12376724 ]
Nikolay Ugarov commented on DIRSERVER-391: ------------------------------------------ Alex, I have the stacktrace in my project (not related to ApacheDS in any way) exactly similar to the one you have on server - actually found this bug searching the net for the stacktrace. It looks like this is sun's bug. http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4729342 Could you please comment, did you upgrade your JDK when when you where testing the resolution? > Loop in client results in NPE + CommunicationException Request: 1 cancelled > --------------------------------------------------------------------------- > > 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 CommunicationException at client side and a NPE at server > side. I added both stacktraces at the end. I also added the code that starts > up the LDAP server. > I googled to find some explanation for the "Request 1: Cancelled", but I > didn't find an useful explanation. There was some topic on a forum that > mentionned 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 > processed. 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=akarasulu,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:136) > 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$SubSelector.processFDSet(WindowsSelectorImpl.java:321) > at > sun.nio.ch.WindowsSelectorImpl$SubSelector.processSelectedKeys(WindowsSelectorImpl.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) -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira
