This problem occurs due to a change in the slf4j-log4j12 jar. From version 1.5.6, it does not allow access to the org.slf4j.impl.StaticLoggerBinder.SINGLETON field.
To solve this problem, use the latest banks (or at least version 1.5.6) for both slf4j-api and slf4j-log4j12.
<dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>1.5.6</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.5.6</version> </dependency>
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