Deadlock with DBAppender
------------------------
Key: LBCLASSIC-148
URL: http://jira.qos.ch/browse/LBCLASSIC-148
Project: logback-classic
Issue Type: Bug
Affects Versions: 0.917
Environment: MacBook Pro 17"
Intel Core 2 Duo
2.33 GHz
OS X 10.5.7 (9J61)
java version "1.6.0_13"
slf4j 1.5.8
c3p0 0.9.1.2
Reporter: Mel T.
Assignee: Logback dev list
A deadlock occurs when running the attached application. For this lock to
occur, we need to:
- load a configuration other than the default in java app.
- not have any default logback.xml in the classpath.
- have these jars in the classpath
c3p0-0.9.1.2.jar
logback-core-0.9.17.jar
logback-classic-0.9.17.jar
log4j-over-slf4j-1.5.8.jar
slf4j-api-1.5.8.jar
mysql.jar
- Place attached the logback2.xml file in the same package as the attached
MainTest class.
- adapt the logback2.xml file to your DB schema. (note that you do not need to
have the DB tables created for the lock to occur, but the test is more
conclusive if you have a valid DB connection and schema.)
- Execute this
java -cp
".:../c3p0-0.9.1.2.jar:../logback-core-0.9.17.jar:../logback-classic-0.9.17.jar:../log4j-over-slf4j-1.5.8.jar:../slf4j-api-1.5.8.jar:../mysql.jar"
MainTest
The application should output the logger status and hang.
Workaround:
- Do not include log4j-over-slf4j in the classpath,
- or add a default logback.xml that will be loaded first (just copy and rename
logback2.xml in same default package)
- or use the attached logback2-works.xml instead of logback2.xml (modify
MainTest to load that file instead.)
In this last one, the change is that the DB appender is only used in a logger
element instead of the root.
I did not spend the time to look at the cause of this locking problem as the
workarounds allow me to move on. So I hope this really belong in jira, and not
a config/usage error on my part.
--
Mel T.
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