diff --git a/depclean-core/src/main/java/se/kth/depclean/core/analysis/ArtifactTypes.java b/depclean-core/src/main/java/se/kth/depclean/core/analysis/ArtifactTypes.java
index 4b245186..2d0b6b17 100644
--- a/depclean-core/src/main/java/se/kth/depclean/core/analysis/ArtifactTypes.java
+++ b/depclean-core/src/main/java/se/kth/depclean/core/analysis/ArtifactTypes.java
@@ -9,9 +9,22 @@
 @Data
 public class ArtifactTypes {
 
+  /**
+   * A HashSet to store the types.
+   */
   private Set<String> allTypes;
+
+  /**
+   * A HashSet to store the used types.
+   */
   private Set<String> usedTypes;
 
+  /**
+   * Ctor.
+   *
+   * @param allTypes  All types in the artifact.
+   * @param usedTypes Thew used types in the artifact.
+   */
   public ArtifactTypes(Set<String> allTypes, Set<String> usedTypes) {
     this.allTypes = allTypes;
     this.usedTypes = usedTypes;
diff --git a/depclean-core/src/main/java/se/kth/depclean/core/analysis/ClassAnalyzer.java b/depclean-core/src/main/java/se/kth/depclean/core/analysis/ClassAnalyzer.java
index 6c23e1b8..9e770a52 100644
--- a/depclean-core/src/main/java/se/kth/depclean/core/analysis/ClassAnalyzer.java
+++ b/depclean-core/src/main/java/se/kth/depclean/core/analysis/ClassAnalyzer.java
@@ -24,16 +24,27 @@
 import java.util.Set;
 
 /**
- * Gets the set of classes contained in a library given either as a jar file or an exploded directory.
+ * Gets the set of classes contained in an artifact given either
+ * as a jar file or an exploded directory.
  */
 public interface ClassAnalyzer {
 
   // fields -----------------------------------------------------------------
 
+  /**
+   * To store the name of the class.
+   */
   String ROLE = ClassAnalyzer.class.getName();
 
   // public methods ---------------------------------------------------------
 
+  /**
+   * Analyze the classes of a given artifact.
+   *
+   * @param url The artifact.
+   * @return A set of classes.
+   * @throws IOException In case of IO issues.
+   */
   Set<String> analyze(URL url)
       throws IOException;
 }
diff --git a/depclean-core/src/main/java/se/kth/depclean/core/analysis/ClassFileVisitor.java b/depclean-core/src/main/java/se/kth/depclean/core/analysis/ClassFileVisitor.java
index 2b8c3f72..4f5c2d7a 100644
--- a/depclean-core/src/main/java/se/kth/depclean/core/analysis/ClassFileVisitor.java
+++ b/depclean-core/src/main/java/se/kth/depclean/core/analysis/ClassFileVisitor.java
@@ -26,5 +26,11 @@
  */
 public interface ClassFileVisitor {
 
+  /**
+   * To visit the classes.
+   *
+   * @param className Name of the class
+   * @param in        To read the bytes.
+   */
   void visitClass(String className, InputStream in);
 }
diff --git a/depclean-core/src/main/java/se/kth/depclean/core/analysis/ClassFileVisitorUtils.java b/depclean-core/src/main/java/se/kth/depclean/core/analysis/ClassFileVisitorUtils.java
index ddfd431c..f4dad7ae 100644
--- a/depclean-core/src/main/java/se/kth/depclean/core/analysis/ClassFileVisitorUtils.java
+++ b/depclean-core/src/main/java/se/kth/depclean/core/analysis/ClassFileVisitorUtils.java
@@ -75,6 +75,13 @@ public static void accept(URL url, ClassFileVisitor visitor)
     }
   }
 
+  /**
+   * Accepts a jar to be analyzed.
+   *
+   * @param url     URL of jar
+   * @param visitor A {@link ClassFileVisitor}.
+   * @throws IOException In case of IO issues.
+   */
   private static void acceptJar(URL url, ClassFileVisitor visitor)
       throws IOException {
     try (JarInputStream in = new JarInputStream(url.openStream())) {
@@ -89,6 +96,13 @@ private static void acceptJar(URL url, ClassFileVisitor visitor)
     }
   }
 
+  /**
+   * Accepts a directory to be analyzed.
+   *
+   * @param directory Directory or File to be analyzed.
+   * @param visitor   A {@link ClassFileVisitor}.
+   * @throws IOException In case of IO issues.
+   */
   private static void acceptDirectory(File directory, ClassFileVisitor visitor)
       throws IOException {
     if (!directory.isDirectory()) {
@@ -108,6 +122,13 @@ private static void acceptDirectory(File directory, ClassFileVisitor visitor)
     }
   }
 
+  /**
+   * Visits the classes.
+   *
+   * @param path Path of the class.
+   * @param in   read the input bytes.
+   * @param visitor A {@link ClassFileVisitor}.
+   */
   private static void visitClass(String path, InputStream in, ClassFileVisitor visitor) {
     if (!path.endsWith(CLASS)) {
       throw new IllegalArgumentException("Path is not a class");
diff --git a/depclean-core/src/main/java/se/kth/depclean/core/analysis/CollectorClassFileVisitor.java b/depclean-core/src/main/java/se/kth/depclean/core/analysis/CollectorClassFileVisitor.java
index 5567cddf..59ca3d75 100644
--- a/depclean-core/src/main/java/se/kth/depclean/core/analysis/CollectorClassFileVisitor.java
+++ b/depclean-core/src/main/java/se/kth/depclean/core/analysis/CollectorClassFileVisitor.java
@@ -32,6 +32,9 @@ public class CollectorClassFileVisitor
     implements ClassFileVisitor {
   // fields -----------------------------------------------------------------
 
+  /**
+   * Set of all classes.
+   */
   private final Set<String> classes;
 
   // constructors -----------------------------------------------------------
@@ -42,16 +45,24 @@ public CollectorClassFileVisitor() {
 
   // ClassFileVisitor methods -----------------------------------------------
 
-  /*
-   * @see org.apache.invoke.shared.dependency.analyzer.ClassFileVisitor#visitClass(java.lang.String,
-   *      java.io.InputStream)
+  /**
+   * {@link ClassFileVisitor}.
+   *
+   * @param className Name of the class
+   * @param in        To read the bytes.
    */
+  @Override
   public void visitClass(String className, InputStream in) {
     classes.add(className);
   }
 
   // public methods ---------------------------------------------------------
 
+  /**
+   * Getter for visited classes.
+   *
+   * @return A set of visited classes.
+   */
   public Set<String> getClasses() {
     return classes;
   }
diff --git a/depclean-core/src/main/java/se/kth/depclean/core/analysis/DefaultClassAnalyzer.java b/depclean-core/src/main/java/se/kth/depclean/core/analysis/DefaultClassAnalyzer.java
index f9032c42..e19eed95 100644
--- a/depclean-core/src/main/java/se/kth/depclean/core/analysis/DefaultClassAnalyzer.java
+++ b/depclean-core/src/main/java/se/kth/depclean/core/analysis/DefaultClassAnalyzer.java
@@ -35,7 +35,7 @@ public class DefaultClassAnalyzer implements ClassAnalyzer {
    * Analyze the class members.
    *
    * @param url The class URL.
-   * @return The visited classes.
+   * @return A set of visited classes.
    * @throws IOException If there is an error.
    */
   public Set<String> analyze(URL url) throws IOException {
diff --git a/pom.xml b/pom.xml
index bbf56691..06b431fd 100644
--- a/pom.xml
+++ b/pom.xml
@@ -208,7 +208,7 @@
           <plugin>
             <groupId>org.apache.maven.plugins</groupId>
             <artifactId>maven-source-plugin</artifactId>
-            <version>2.2.1</version>
+            <version>3.0.1</version>
             <executions>
               <execution>
                 <id>attach-sources</id>