slf4j version fixed to 1.7.25

pom.xml

@@ -83,8 +83,7 @@
 		<hsqldb.version>2.3.6</hsqldb.version>
 		<ehcache.version>2.7.4</ehcache.version>
 
-		<slf4j.version>1.7.21</slf4j.version>
-		<log4j.version>1.2.17</log4j.version>
+		<slf4j.version>1.7.25</slf4j.version>
 
 		<aspectj.version>1.8.9</aspectj.version>
 
@@ -188,12 +187,6 @@
 			<version>${slf4j.version}</version>
 		</dependency>
 
-		<dependency>
-			<groupId>log4j</groupId>
-			<artifactId>log4j</artifactId>
-			<version>${log4j.version}</version>
-		</dependency>
-
 		<dependency>
 			<groupId>org.slf4j</groupId>
 			<artifactId>jcl-over-slf4j</artifactId>