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  1. JDK
  2. JDK-8230746

Class LdapCtx create unclosed socket when attempt to reconnect

    Details

    • Type: Bug
    • Status: Closed
    • Priority: P3
    • Resolution: Duplicate
    • Affects Version/s: 11.0.4
    • Fix Version/s: None
    • Component/s: core-libs

      Description

      ADDITIONAL SYSTEM INFORMATION :
      Centos 7 / 64 bits / OpenJDK11.0.4
      Tomcat 8.5

      A DESCRIPTION OF THE PROBLEM :
      There is some changes to this classe that cause a leak on sockets.
      The issue is probably OS independent.

      Class is com.sun.jndi.ldap.LdapCtx on private method connect.
      In case of reconnection attempt, a new LdapClient (that create a new socket) is instancied and the previous socket maintained by the previous LdapClient is not closed.

      A patch should be like that :
      if (reconnect && clnt != null) {
          clnt.closeConnection();
      }
      clnt = LdapClient.getInstance(...)


      REGRESSION : Last worked in version 8u212

      STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
      Create a login.config to authorize tomcat to connect to an ldap server (active directory in my case but it's clearly independent), use this config in a JMX context.
      Use a JMX client (java mission control in my case) which retrieve informations about tomcat MBean and have a look to TCP connections by using lsof linux command.
      Exit from JMX client, sockets on ldap remains (ESTABLISHED)

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      Sockets should be closed, I'm not using socket pooling.
      ACTUAL -
      Sockets remains opened for a long time (GC probably destroy java Socket objects and OS sockets by the way).

      FREQUENCY : always


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              • Assignee:
                psonal Pallavi Sonal (Inactive)
                Reporter:
                webbuggrp Webbug Group
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                • Created:
                  Updated:
                  Resolved: