Set slf4j dependency to commonly used version.
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
- <version>1.7.5</version>
+ <version>${slf4j.version}</version>
+ </dependency>
+ <dependency>
+ <groupId>org.slf4j</groupId>
+ <artifactId>slf4j-log4j12</artifactId>
+ <version>${slf4j.version}</version>
</dependency>
<dependency>
<groupId>log4j</groupId>
