Multithreaded application hangs accessing LDAP

[Former Member]

Hi!

Since recently we have noticed our portal hangs without any obvious reason. We have taken thread dumps and it shows error lines as similar to the below. Only work around for this restarting the server. Deep analysis of the thread shows that the Having analysed the issue and discussed it with colleagues, we believe that threads become blocked as the j2ee server tries to connect to the ldap server unsuccessfully.

at java.lang.Object.wait(Native Method)

- waiting on <800003ff6ba534a0> (a com.sun.jndi.ldap.LdapRequest)

at com.sun.jndi.ldap.Connection.readReply(Connection.java:418)

- locked <800003ff6ba534a0> (a com.sun.jndi.ldap.LdapRequest)

at com.sun.jndi.ldap.LdapClient.ldapBind(LdapClient.java:340)

- locked <800003ff6ba53500> (a com.sun.jndi.ldap.LdapClient)

at com.sun.jndi.ldap.LdapClient.authenticate(LdapClient.java:193)

- locked <800003ff6ba53500> (a com.sun.jndi.ldap.LdapClient)

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 com.sap.engine.system.naming.provider.DefaultInitialContext._getDefaultInitCtxt(DefaultInitialContext.java:65)

Can anyone advice us why we are getting this and how we can overcome this issue?

Regards

Ramesh

[Former Member]

Hi Ramesh,

We encountered a similar issue today with one of our portal instances. Were you able to figure out what causes this issue?

Regards,

Melwyn

[Former Member]

Is the LDAP being used giving any indications of behaving slowly? The LDAP is normally only read at logon time and if something is causing a lot of requests it could happen...