Solving 5 issues

pom.xml

@@ -8,6 +8,12 @@
     <artifactId>ch.hearc.ig.odi.stringcalculatortdd</artifactId>
     <version>1.0-SNAPSHOT</version>
 
+
+    <properties>
+        <maven.compiler.source>1.8</maven.compiler.source>
+        <maven.compiler.target>1.8</maven.compiler.target>
+    </properties>
+
     <dependencies>
         <dependency>
             <groupId>junit</groupId>
@@ -30,11 +36,21 @@
             <artifactId>log4j-core</artifactId>
             <version>2.11.1</version>
         </dependency>
-      <dependency>
-        <groupId>org.apache.logging.log4j</groupId>
-        <artifactId>log4j-api</artifactId>
-        <version>2.11.1</version>
-      </dependency>
-    </dependencies>
+  </dependencies>
+
+        <build>
+            <plugins>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-compiler-plugin</artifactId>
+                    <version>3.7.0</version>
+                    <configuration>
+                        <source>1.8</source>
+                        <target>1.8</target>
+                    </configuration>
+                </plugin>
+            </plugins>
+        </build>
+
 
 </project>

src/main/java/ch/hearc/ig/odi/logger/LogClass.java

@@ -1,13 +1,22 @@
 package ch.hearc.ig.odi.logger;
 
-
 import org.apache.logging.log4j.*;
+
 public class LogClass {
 
   private static final Logger LOGGER = LogManager.getLogger(LogClass.class);
 
-  public static void 	info(CharSequence message){}
+  public static void 	info(CharSequence message){
+   //issue #4
+    //System.out.println("Logger information : " + message);
+  }
+
+  public static void 	warn(CharSequence message){
+    System.out.println("\u001B[31m" + "Logger warning : " + message);
+  }
 
-  public static void 	warn(CharSequence message){}
+  public static void 	fatal(CharSequence message){
+    System.out.println("\u001B[33m" + "Logger fatal : " + message);
+  }
 
 }

src/main/java/ch/hearc/ig/odi/stringcalculatortdd/StringCalculator.java

@@ -2,11 +2,11 @@
 
 import ch.hearc.ig.odi.logger.LogClass;
 import org.apache.commons.lang3.StringUtils;
-import ch.hearc.ig.odi.logger.LogClass;
 
 import java.util.ArrayList;
 import java.util.List;
 import java.util.regex.Pattern;
+import org.apache.logging.log4j.*;
 
 public class StringCalculator {
 
@@ -51,6 +51,7 @@ else if (numberInt > 1000)
         }
 
         if (negativeNumbers.size() > 0) {
+            LogClass.fatal("Nombre négatif interdit");
             throw new RuntimeException("Negative not allowed: " + negativeNumbers.toString());
         }
 

src/main/resources/log4j2.xml

@@ -4,10 +4,29 @@
     <Console name="Console" target="SYSTEM_OUT">
       <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg%n"/>
     </Console>
+
+    <appender name="FILE" class="org.apache.log4j.FileAppender">
+
+      <param name="file" value="${log}/log.out"/>
+      <param name="immediateFlush" value="true"/>
+      <param name="threshold" value="debug"/>
+      <param name="append" value="false"/>
+
+      <layout class="org.apache.log4j.PatternLayout">
+        <param name="conversionPattern" value="%m%n"/>
+      </layout>
+    </appender>
   </Appenders>
   <Loggers>
     <Root level="trace">
       <AppenderRef ref="Console"/>
     </Root>
+
+    <logger name="log4j.rootLogger" additivity="false">
+      <level value="DEBUG"/>
+      <appender-ref ref="FILE"/>
+    </logger>
   </Loggers>
+
+
 </Configuration>