Multiple libraries using log4j

Question

I'm writing a small Java application and having some trouble with log4j that appears to be caused by multiple, independent libraries trying to use it simultaneously:

Exception in thread "main" java.lang.NoSuchMethodError: org.apache.log4j.Logger.info(Ljava/lang/String;)V
    at twitter4j.internal.logging.Log4JLogger.info(Log4JLogger.java:85)
    at twitter4j.internal.logging.Logger.<clinit>(Logger.java:72)
    at twitter4j.http.BasicAuthorization.<clinit>(BasicAuthorization.java:43)
    at twitter4j.http.AuthorizationFactory.getBasicAuthorizationInstance(AuthorizationFactory.java:66)
    at twitter4j.TwitterStreamFactory.getInstance(TwitterStreamFactory.java:121)
    at org.voltdb.twitter.drivers.Collect.main(Collect.java:13)

The two libraries I'm using are Twitter4J and VoltDB. Both are in the form of JARs. If I use either in isolation, I don't run into this problem; both work fine on their own.

It would be acceptable to disable the log4j component of either library if this fixed the problem.

Answer 1

You can try to change the order on which the libraries are loaded by editing your classpath or to find a version which works with both in order to put it at the beginning of the classpath.

If you want to disable log4j, you can create for example a file named log4j.properties with the following content:

log4j.rootLogger=OFF

Now, you need to start your application by setting the log4j.configuration java variable :

java -Dlog4j.configuration=file:pathTo/log4j.properties my.app.Launcher

Answer 2

Are you sure you're using the right version of log4j as required by both libraries? Your error message seems to indicate in incorrect log4j version IMO.

Answer 3

I came across a reply to a Twitter4J logging problem that shows how to disable logging:

-Dtwitter4j.loggerFactory=twitter4j.internal.logging.StdOutLoggerFactory

Adding this property made the exception disappear.

Answer 4

Thanks a lot! it seems helped me right now after struggling with it almost full day