diff --git a/pom.xml b/pom.xml
index 4f9f9ae..b829176 100644
--- a/pom.xml
+++ b/pom.xml
@@ -6,14 +6,15 @@
     <version>0.1.0-SNAPSHOT</version>
     <name>Fishing Contest</name>
     <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <java.version>11</java.version>
         <eclipse.version>4.3</eclipse.version>
         <opt>${user.home}/opt</opt>
         <eclipse.home>${opt}/eclipse/kepler</eclipse.home>
         <eclipse.plugins>${eclipse.home}/plugins</eclipse.plugins>
-
         <!-- maven-compiler-plugin -->
-        <maven.compiler.target>1.7</maven.compiler.target>
-        <maven.compiler.source>1.7</maven.compiler.source>
+        <maven.compiler.target>${java.version}</maven.compiler.target>
+        <maven.compiler.source>${java.version}</maven.compiler.source>
     </properties>
     <dependencies>
         <dependency>
@@ -128,20 +129,49 @@
                     <groupId>org.apache.maven.plugins</groupId>
                     <artifactId>maven-compiler-plugin</artifactId>
                     <version>3.8.0</version>
-                    <configuration>
-                        <compilerArguments>
-                            <bootclasspath>${java.home}/lib/rt.jar</bootclasspath>
-                        </compilerArguments>
-                    </configuration>
                 </plugin>
                 <plugin>
                     <groupId>org.codehaus.mojo</groupId>
                     <artifactId>exec-maven-plugin</artifactId>
                     <version>1.6.0</version>
                 </plugin>
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-enforcer-plugin</artifactId>
+                    <version>3.0.0-M2</version>
+                </plugin>
             </plugins>
         </pluginManagement>
         <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-enforcer-plugin</artifactId>
+                <executions>
+                    <execution>
+                        <id>enforce-java</id>
+                        <goals>
+                            <goal>enforce</goal>
+                        </goals>
+                        <configuration>
+                            <rules>
+                                <requireJavaVersion>
+                                    <version>[11,)</version>
+                                </requireJavaVersion>
+                            </rules>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <release>${java.version}</release>
+                    <!-- compilerArguments>
+                        <bootclasspath>${java.home}/lib/rt.jar</bootclasspath>
+                    </compilerArguments -->
+                </configuration>
+            </plugin>
             <plugin>
                 <groupId>org.codehaus.mojo</groupId>
                 <artifactId>exec-maven-plugin</artifactId>
diff --git a/src/main/java/org/fc/data/Contest.java b/src/main/java/org/fc/data/Contest.java
index 74994af..862e692 100644
--- a/src/main/java/org/fc/data/Contest.java
+++ b/src/main/java/org/fc/data/Contest.java
@@ -162,10 +162,11 @@ public void dumpToFile(String fileName) throws XMLStreamException, FileNotFoundE
 
         XMLOutputFactory xmlof = XMLOutputFactory.newInstance();
 
+// TODO: find new way of indenting xml stream writer
+//  XMLStreamWriter xmlw = new com.sun.xml.internal.txw2.output.IndentingXMLStreamWriter(
+//                xmlof.createXMLStreamWriter(new FileOutputStream(fileName)));
 
-        XMLStreamWriter xmlw = new com.sun.xml.internal.txw2.output.IndentingXMLStreamWriter(
-                xmlof.createXMLStreamWriter(new FileOutputStream(fileName)));
-
+        XMLStreamWriter xmlw = xmlof.createXMLStreamWriter(new FileOutputStream(fileName));
 
         xmlw.writeStartDocument();
         xmlw.writeStartElement("contest");