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MySQL Connector/J 8.0.20 has been released

Dear MySQL users,

MySQL Connector/J 8.0.20 is the latest General Availability release of
the MySQL Connector/J 8.0 series.  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 8.0.20 GA, see the “General Availability
(GA) Releases” tab at


Changes in MySQL Connector/J 8.0.20 (2020-04-27, General Availability)

* Functionality Added or Changed

* Bugs Fixed

Functionality Added or Changed

* X DevAPI: Connector/J now supports data compression for X Protocol
connections ( compression.html). See Connection Compression Using X DevAPI ( for details.

* A new method, getElapsedTime(), has been added to
Connector/J ‘s implementation of the Statement interface,
to expose the elapsed time for a query. Thanks to Matti
Sillanpää for contributing the code. (Bug #30570249, Bug

Bugs Fixed

* When a custom Calendar was used in the setDate method for
a PreparedStatement, it was being used by subsequent
calls of the same method that did not use the same
calendar, resulting in the wrong date being set. It was
because the SimpleDateFormat object created internally
with the custom calendar was cached and reused. With this
fix, the object is no longer cached. (Bug #30877755)

* Setting the connection property clientInfoProvider
without using the fully qualified class name for
ClientInfoProviderSP caused a NullPointerException. This
was due to some wrong exception handling, which has been
corrected by this fix. (Bug #30832513)

* Authentication failed when a client tried to connect to a
server that used Windows Authentication Plugin and the
Kerberos protocol. It was because the implementation of
the NativeAuthenticationProvider class by Connector/J did
not interact correctly with a custom-made Kerberos
authentication plugin, and this patch fixes the issue.
(Bug #30805426)

* Methods from the ResultSetUtil class are no longer used
in Connector/J 8.0.20; the class has therefore been
removed. (Bug #30636056)

* A NullPointerException was returned when the connection
had cacheResultSetMetadata=true and a query containing
any SET statements was executed. This fix corrects the
issue by adding the missing variable assignment, and also
a null check. (Bug #30584907, Bug #97757)

* A DataConversionException was thrown when an application
tried to store a string starting with “d.” [d was any
digit] into a VARCHAR column. It was due to a parsing
error in the AbstractNumericValueFactory, which has been
fixed by this patch. Thanks to Nick Pollett for
contributing the code. (Bug #30570721, Bug #97724)

* When creating a Statement, the specification for the
resultSetType parameter was not honored, so that the
ResultSet type was always set to
ResultSet.TYPE_FORWARD_ONLY. With this fix, the
resultSetType parameter is now honored. Also, type
validation has been added so that calling the methods
beforeFirst, afterLast, first, last, absolute, relative,
or previous results in an exception if the ResultSet type
is ResultSet.TYPE_FORWARD_ONLY. (Bug #30474158)

* When a Calendar was not used, a java.sql.Date value could
not always be stored into and then retrieved from a MySQL
server consistently. It was because Connector/J always
converted a Date value to the server’s time zone when
storing it on the server as a MySQL DATE; but since a
MySQL DATE does not have any time value, the hour,
minute, and second parts of the original date was
effectively lost. If the converted value is one day ahead
of or behind the original value, when the value was
retrieved through Connector/J and converted back to the
local time zone, there was no time value for adjusting
the date back to its original value, resulting in a
one-day error. With this fix, any Date value is converted
to MySQL DATE value using the JVM’s time zone, so that
the value is always consistent when being stored and then
read back.
Also, the cacheDefaultTimezone connection property,
previously removed from Connector/J 8.0, has now been
restored so that when it is set to false, Connector/J
becomes aware of the time zone changes of the JVM during
runtime and converts dates with the updated time zone.
(Bug #28125069, Bug #91112)

On Behalf of MySQL Release Engineering Team,
Surabhi Bhat