MySQL Connector/J8.0.20

Functionality Added or Changed

• X DevAPI: Connector/J now supports data compression for X Protocol connections. See Connection Compression Using X DevAPI for details.
• A new method, getElapsedTime(), has been added to the implementation of the Statement interface in Connector/J, to expose the elapsed time for a query. Thanks to Matti Sillanpää for contributing the code.

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.
• 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.
• 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.
• Methods from the ResultSetUtil class are no longer used in Connector/J 8.0.20; the class has therefore been removed.
• 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.
• 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.
• 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.
• 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.