MySQL Bugs: #13469: log4J incompatibility: class: com/mysql/jdbc/log/Log4JLogger, method: isFatalEn

Bug #13469	log4J incompatibility: class: com/mysql/jdbc/log/Log4JLogger, method: isFatalEn
Submitted:	25 Sep 2005 17:13	Modified:	7 Apr 2006 23:37
Reporter:	Ralf Hauser
Status:	Closed
Category:	Connector/J	Severity:	S1 (Critical)
Version:	mysql-connector-java-3.1-nightly-2005092	OS:	Microsoft Windows (windows XP)
Assigned to:	Mark Matthews	Target Version:

Description:
Hi,

The reason for the following error may be that I use log4j-1.3alpha-6.jar together with
mysql-connector-java-3.1-nightly-20050925-bin-g.jar

java.lang.VerifyError: (class: com/mysql/jdbc/log/Log4JLogger, method: isFatalEnabled
signature: ()Z) Incompatible argument to function
	at java.lang.Class.forName0(Native Method)
	at java.lang.Class.forName(Class.java:164)
	at com.mysql.jdbc.log.LogFactory.getLogger(LogFactory.java:68)
	at com.mysql.jdbc.Connection.initializeDriverProperties(Connection.java:3624)
	at com.mysql.jdbc.Connection.<init>(Connection.java:1471)
	at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:264)
	at
org.apache.commons.dbcp.DriverConnectionFactory.createConnection(DriverConnectionFactory.j
ava:37)
	at
org.apache.commons.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.jav
a:290)
	at
org.apache.commons.dbcp.BasicDataSource.validateConnectionFactory(BasicDataSource.java:877
)
	at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:851)
	at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:540)

How to repeat:
it appears that the error is not reproducible with
mysql-connector-java-3.1-nightly-20050925-bin.jar

oops, I have to correct, it also happens with
  mysql-connector-java-3.1-nightly-20050925-bin.jar
but it does not happen with mysql-connector-java-3.1.9-bin.jar

At this time, we support production versions of Log4j, not alpha releases.

We'll revisit fixing this for the latest version of log4j _when_it_ships_.

A workaround would be to create your own log factory, and then you would be able to work
with their new API.

that's certainly reasonable and going back to 1.2.12 fixes it for now.

But if you touch this next time, I suggest you go for commons-logging instead of log4j -
if that had been done, I wouldn't have run into the error because I use a
commons-logging.jar version that can handle the log4j-1.3*

This bug also prevents using Connector/J versions higher than 3.1.9 with any legacy
applications that embed older log4j versions, like v1.1.3.

I tried to add this to the jdbc URL : ?logger=com.mysql.jdbc.log.StandardLogger,
but the problem still occurs (connector/J 5, log4j 1.3-alpha7)

Since I'm specifying a different logger, not log4j, why does the problem still occur ? Why
is the mysql log4j logger even loaded ?

thanks
Ricardo

A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/commits/2814

"A workaround would be to create your own log factory, and then you would be able
to work with their new API."

Can someone elaborate briefly on how this is done, or where documentation can be found on
how to do it?

Thanks

Actually if you look at the nightly snapshots of 3.1 or 5.0, you'll see we've added
"CommonsLogger" as a log factory, so you _can_ use Jakarta Commons if you want.

(or look at any of the *Logger classes in com.mysql.jdbc.log to see how it's done)

I had the same problem with log4j 1.3alpha-7. I've just downloaded the 1.3alpha-8 and it
solved my problem.
http://cvs.apache.org/dist/logging/log4j/1.3alpha-8/logging-log4j-1.3alpha-8.zip

Jeff

We actually ended up removing autodetection of Log4j, as it was too problematic. See the
CHANGES for 3.1.13 or 5.0.1 when released for details, or look at the link to the
changeset listed in this bug report.

This fix is in the nightly builds available at
http://downloads.mysql.com/snapshots.php#connector-j

hola