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MySQL Connector/J 8.0.16 has been released
Posted by: Sreedhar Sreedhargadda
Date: April 25, 2019 11:26AM

Dear MySQL users,

MySQL Connector/J Version 8.0.16 is the GA release of the 8.0
branch of MySQL Connector/J. It is suitable for use with MySQL Server
versions 8.0, 5.7 and 5.6. It supports the Java Database
Connectivity (JDBC) 4.2 API, and implements the X DevAPI.

This release includes the following new features and changes, also
described in more detail on

As always, we recommend that you check the "CHANGES" file in the
download archive to be aware of changes in behavior that might affect
your application.

To download MySQL Connector/J 8.0.16 GA, see the "Generally Available
(GA) Releases" tab at



Changes in MySQL Connector/J 8.0.16 (2019-04-25, General Availability)

Functionality Added or Changed

     * X DevAPI: Added BigInteger, BigDecimal, and Character as
       supported classes whose instances can be passed to a
       Table as Expression instances. Also made the error
       message clearer when applications try to pass instances
       of unsupported classes. (Bug #25650912)

     * X DevAPI: Connector/J now supports the ability to send
       connection attributes
       (key-value pairs that application programs can pass to the
       server at connect time) for X Protocol connections.
       Connector/J defines a default set of attributes
       which can be disabled or enabled. In addition,
       applications can specify attributes to be
       passed in addition to the default attributes. The default
       behavior is to send the default attribute set. See the
       description for the new configuration property
       xdevapi.connect-attributes for details.
       The aggregate size of connection attribute data sent by a
       client is limited by the value of the
       performance_schema_session_connect_attrs_size server
       variable. The total size of the data package should be
       less than the value of the server variable, or the
       attribute data will be truncated.

     * X DevAPI: When using X DevAPI, performance for statements
       that are executed repeatedly (two or more times) is
       improved by using server-side prepared statements for the
       second and subsequent executions. See Working with
       Prepared Statements
        in the X DevAPI User Guide
       ( for details.

     * The version number has been removed from the name of the
       Connector/J JAR archive within the RPM packages for
       Connector/J. That makes upgrading Connector/J with RPM
       packages easier. (Bug #29384853)

     * The collation utf8mb4_zh_0900_as_cs has been added to the
       CharsetMapping class. (Bug #29244101)

     * The following third-party libraries have been removed
       from the distribution bundles for Connector/J:

          + Google protobuf for Java (required for using X
            DevAPI and for building Connector/J from source)

          + C3P0 (required for building Connector/J from source)

          + JBoss common JDBC wrapper (required for building
            Connector/J from source)

          + Simple Logging Facade API (required for using the
            logging capabilities provided by the default
            implementation of org.slf4j.Logger.Slf4JLogger by
            Connector/J, and for building Connector/J from
       Users who need those libraries have to obtain them on
       their own. See Installing Connector/J from a Binary
       and Installing from Source
       for details.

Bugs Fixed

     * X DevAPI: The method unquoteWorkaround() has been removed
       from the ExprParser class, as the workaround is no longer
       needed, and it actually produced wrong results in some
       cases. (Bug #29257922)

     * X DevAPI: Connector/J threw an error when a JSON document
       contained only a field with an empty array as its value.
       With this fix, Connector/J now takes that as a valid JSON
       document. (Bug #28834959, Bug #92819)

     * getByte() calls failed on table columns of the
       BINARY data type. This was due to issues with string
       conversion, which has been corrected with this fix. (Bug

     * X DevAPI: Any statements sent after a failed procedure
       call caused Connector/J to hang. This was because after
       the failed call, Connector/J was not aware that the
       result streamer had already been closed by the server.
       With this fix, an error is thrown when the procedure call
       fails, and the result streamer is nullified. (Bug

     * X DevAPI: Unary negative and positive operators inside
       expressions were parsed wrongly as binary minus and plus
       operators. (Bug #21921956)

     * Because the SHOW PROCESSLIST
        statement might cause the server to fail sometimes,
        Connector/J now avoids using the statement, but queries
        the performance scheme instead for the information it
        needs. (Bug #29329326)

     * Some unnecessary information has been removed from the
       Connector/J log. (Bug #29318273)

     * In the DatabaseMetaDataUsingInfoSchema interface, the
       getProcedureColumns() and getFunctionColumns() methods
       returned wrong results for the PRECISION column, and the
       getColumns() and getVersionColumns() methods returned
       wrong results for the COLUMN_SIZE column. The errors were
       due to the wrong handling of the temporal type precision
       by Connector/J, which has now been fixed. (Bug #29186870)

     * For an SSL connection, after a client disconnected from a
       server by calling Connection.close(), the TCP connection
       remained in the TIME_WAIT
       state on the server side. With this fix,
       the connection remains in the TIME_WAIT
       state on the client side instead, in most
       cases. (Bug #29054329, Bug #93590)

     * The function
       LoadBalancedConnectionProxy.getGlobalBlacklist() always
       returned an empty map, thus there was never a blacklist
       for load-balanced connections. (Bug #28860051, Bug

     * The redundant file, changelog.gz, has been removed from
       the Debian 9 package for Connector/J. The file repeated
       the contents of the CHANGES.gz file. (Bug #27786499)

     * Using getBytes() to retrieve TEXT data resulted in a
       NumberFormatException. With this fix, the proper
       exception (SQLDataException), is now thrown. (Bug

     * A changeUser() call failed with a
       when the configuration property enablePacketDebug was set
       to true for a connection. (Bug #25642021)

     * bindings.getBoolean() always returned false. It was due
       to a mishandling of data types, which has been corrected
       with this fix. (Bug #22931700)

Enjoy and thanks for the support!

On Behalf of MySQL/ORACLE RE Team
Sreedhar S 

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MySQL Connector/J 8.0.16 has been released
April 25, 2019 11:26AM

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