Small Java program that does repeatedly connect to a directory server
via javax.naming.directory.InitialDirContext() sees a memory leak.
The problem was only reproducible with 64-bit JVM on 64-bit Linux RHEL4 U4 so far.
The problem is only reproducible on multiprocessor hardware.


1. Testcase
-----------
 The problem could be reproduced with the following program:
 It only iterates over
   ctx=new InitialDirContext(env);

 Customer's testcase running on new Intel 64-bit processors
 can reproduce the problem also with doing a ctx.search()
 

% more test.java

import java.util.Hashtable;
import javax.naming.directory.InitialDirContext;
import javax.naming.Context;


public class test
{

  public static void main(String[] args) {

    Hashtable env=null;
    String ldapServerName=null;
    String ldapServerPort=null;
    String bindDN=null;
    String bindPassword=null;
    String timeOut=null;
    String debug=null;

    try {

      ldapServerPort=System.getProperty("port","389");
      ldapServerName=System.getProperty("server","127.0.0.1");
      bindDN="cn=Manager,dc=sun,dc=com";
      bindPassword=System.getProperty("password","secret");

      timeOut=System.getProperty("timeout","3000");

        // Make the context...
      env=new Hashtable();
        // init ldap service
      env.put(Context.INITIAL_CONTEXT_FACTORY,"com.sun.jndi.ldap.LdapCtxFactory");
        // give host and port
      env.put(Context.PROVIDER_URL, "ldap://"+ldapServerName+":"+ldapServerPort);
        // If using anonymous authentication
// env.put(Context.SECURITY_AUTHENTICATION, "none");
      env.put(Context.SECURITY_AUTHENTICATION, "simple");
      env.put(Context.SECURITY_PRINCIPAL, bindDN);
      env.put(Context.SECURITY_CREDENTIALS, bindPassword);
      env.put("com.sun.jndi.ldap.connect.timeout", timeOut);

    }
    catch(Exception ex) {
      System.out.println("Authorisation failed: " +ex);
    }

    InitialDirContext ctx=null;

    while(true) {
      try {
        // open LDAP connection
        ctx=new InitialDirContext(env);
      } catch(Exception ex) {
        System.out.println("InitialDirContext failed: "+ex);
        if (debug != null) ex.printStackTrace();
      } finally {

        try {
          if(ctx != null) { ctx.close(); }
        } catch(Exception ex) {
          System.out.println("ctx.close gave error:"+ex);
        }
        ctx=null;
      } //try
    } //while

  }
}


2. Leak
-------
$ ps -edalf | grep java
0 S tl15687 13666 21989 80 76 0 - 76646 - 08:49 pts/1 00:00:14 jdk1.5.0_11/bin/java -Xmx10m test
$
 running over the weekend:
$ ps -edalf | grep java
0 S tl15687 11532 1 38 77 0 - 85607 - Feb02 ? 1-01:53:51 jdk1.5.0_11/bin/java -Xmx10m test
$

  PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
13666 tl15687 17 0 299m 40m 9368 S 34 0.5 0:28.39 java

  PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
11532 tl15687 20 0 334m 79m 9396 S 34 1.0 1554:03 java



3. additional information
-------------------------
 The leak seems to be dependant of exceptions.
 One exception that is strictly associated with the leak is the following:

InitialDirContext failed: javax.naming.CommunicationException: 127.0.0.1:389 [Root exception is java.net.ConnectException: Cannot assign requested address]

 This expands to the following:

InitialDirContext failed: javax.naming.CommunicationException: 127.0.0.1:389 [Root exception is java.net.ConnectException: Cannot assign requested address]
javax.naming.CommunicationException: 127.0.0.1:389 [Root exception is java.net.ConnectException: Cannot assign requested address]
        at com.sun.jndi.ldap.Connection.<init>(Connection.java:194)
        at com.sun.jndi.ldap.LdapClient.<init>(LdapClient.java:118)
        at com.sun.jndi.ldap.LdapClient.getInstance(LdapClient.java:1578)
        at com.sun.jndi.ldap.LdapCtx.connect(LdapCtx.java:2596)
        at com.sun.jndi.ldap.LdapCtx.<init>(LdapCtx.java:283)
        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:667)
        at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:247)
        at javax.naming.InitialContext.init(InitialContext.java:223)
        at javax.naming.InitialContext.<init>(InitialContext.java:197)
        at javax.naming.directory.InitialDirContext.<init>(InitialDirContext.java:82)
        at test.main(test.java:115)
Caused by: java.net.ConnectException: Cannot assign requested address
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
        at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
        at java.net.Socket.connect(Socket.java:516)
        at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:585)
        at com.sun.jndi.ldap.Connection.createSocket(Connection.java:333)
        at com.sun.jndi.ldap.Connection.<init>(Connection.java:181)
        ... 14 more

 On Solaris I could not reproduce the problem. I see exceptions as well,
 but not the "java.net.ConnectException: Cannot assign requested address"
 exceptions.
 On Solaris, we have:
InitialDirContext failed: javax.naming.CommunicationException: 10.16.54.104:489 [Root exception is java.net.SocketTimeoutException: connect timed out]

 We were unable to see a memory leak on Solaris with this
 "java.net.SocketTimeoutException: connect timed out" exception.