Tag Archives: Maven log jar package conflict error

[Solved] Maven log jar package conflict error: Class path contains multiple SLF4J bindings

Leave a reply

Error performance:

SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/D:/learn/Java/maven/repository_taotao/org/slf4j/slf4j-log4j12/1.6.4/slf4j-log4j12-1.6.4.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/D:/learn/Java/maven/repository_taotao/org/apache/activemq/activemq-all/5.11.2/activemq-all-5.11.2.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.

The console error is shown in the figure below:

The cause of the error:
a jar package conflict occurred:
respectively:

SLF4J: Found binding in [jar:file:/D:/learn/Java/maven/repository_taotao/org/slf4j/slf4j-log4j12/1.6.4/slf4j-log4j12-1.6.4.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/D:/learn/Java/maven/repository_taotao/org/apache/activemq/activemq-all/5.11.2/activemq-all-5.11.2.jar!/org/slf4j/impl/StaticLoggerBinder.class]

solution:

You can go to pom.xml, open Dependency Hierarchy and find the slf4j entry . Except by right-clicking “exclude maven artifact” to exclude the remaining entries.

Run mvn dependency:tree and search for which dependencies have implementations of slf4j you don’t want, then use dependency exclusion to exclude them, for example:

        <dependency>
            <groupId>org.apache.zookeeper</groupId>
            <artifactId>zookeeper</artifactId>
            <exclusions>
                <exclusion>
                    <artifactId>slf4j-log4j12</artifactId>
                    <groupId>org.slf4j</groupId>
                </exclusion>
            </exclusions>
        </dependency>
        <dependency>
            <groupId>com.github.sgroschupf</groupId>
            <artifactId>zkclient</artifactId>
        </dependency>
        <!-- Configure dependency jar packages for the ActiveMQ client -->
        <dependency>
            <groupId>org.apache.activemq</groupId>
            <artifactId>activemq-all</artifactId>
        </dependency>
        <dependency>
            <groupId>com.taotao</groupId>
            <artifactId>taotao-common</artifactId>
            <version>0.0.1-SNAPSHOT</version>
            <exclusions>
                <exclusion>
                    <artifactId>slf4j-log4j12</artifactId>
                    <groupId>org.slf4j</groupId>
                </exclusion>
            </exclusions>
        </dependency>
    </dependencies>