added dependencies and config file to satisfy logger used by rdf4j

Author: roman-la

pom.xml

@@ -104,5 +104,15 @@
             <artifactId>commons-cli</artifactId>
             <version>1.4</version>
         </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-api</artifactId>
+            <version>1.7.26</version>
+        </dependency>
+        <dependency>
+            <groupId>org.slf4j</groupId>
+            <artifactId>slf4j-log4j12</artifactId>
+            <version>1.7.26</version>
+        </dependency>
     </dependencies>
 </project>

src/main/resources/log4j.properties

@@ -0,0 +1,4 @@
+log4j.rootLogger=DEBUG, stdout
+log4j.appender.stdout=org.apache.log4j.ConsoleAppender
+log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
+log4j.logger.org.eclipse.rdf4j.rio=FATAL