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1，出现问题的配置
<dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>${org.slf4j.version}</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-jdk14</artifactId> <version>${org.slf4j.version}</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>${org.slf4j.version}</version> </dependency>
2，去掉上面多余的slf4j-jdk14，问题得到解决，正确配置如下：
<dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-api</artifactId> <version>${org.slf4j.version}</version> </dependency> <dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>${org.slf4j.version}</version> </dependency>
3,原因，查看官网，答案很明显：错误的配置了SLF4J的多个实现
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原文地址：http://www.cnblogs.com/firebata/p/4699453.html
