The UnboundID LDAP SDK for Java version 0.9.9 has just been released. The release notes provide the complete set of changes, but some of the most significant changes since the 0.9.8 release are listed below.

Maximum Search Response Queue Size

The LDAP SDK now places a maximum size limit on the blocking queue used to hold search result entries and references while waiting for them to be processed. When using a search result listener to consume these types of responses, this can help prevent problems in which the client could potentially run out of memory if a large number of search results are returned faster than the client can process them. With this change, if the client falls behind then the LDAP SDK may eventually create back-pressure against the directory server so that it will only be able to return entries and references as fast as the client can consume them.

Referral Enhancements

It is now possible to control on a per-request basis whether the LDAP SDK should automatically try to follow any referrals returned by the server. This was previously only available on a per-connection basis. In addition, a bug has been fixed that could cause referral following to fail for search operations.

User-Friendly Names for Connections and Connection Pools

It is now possible to assign user-friendly names for individual LDAP connections or LDAP connection pools. These names can be helpful in applications which maintain multiple connections or connection pools for different purposes. These names can be queried from code, and will appear in thread stack traces for the threads used to read responses for those connections.

Debugging Enhancements

It is now possible to indicate that debug log messages should include a stack trace of the thread that generated the message. It is possible to capture a stack trace at the time that a connection is established. The debug log message format has been changed to make the messages more consistent and easier to parse. In the even that a connection is terminated because of an unrecoverable error while attempting to read data from the client, then the underlying cause for that is now more visible.

Additional Connection Pool Statistics

LDAP connection pools now expose additional statistics that can be used to keep track of how a connection was obtained when checking a connection out of the pool (e.g., whether it was obtained immediately without blocking, whether it had to wait for a connection to become available, or whether a new connection was created). This can be helpful when determining whether a connection pool is sized appropriately for the application that is using it.