diff --git a/pom.xml b/pom.xml
index 95210ad..46aed72 100644
--- a/pom.xml
+++ b/pom.xml
@@ -291,7 +291,7 @@
             <configuration>
               <show>public</show>
               <failOnError>true</failOnError>
-              <failOnWarnings>false</failOnWarnings>
+              <failOnWarnings>true</failOnWarnings>
             </configuration>
           </execution>
         </executions>
diff --git a/src/main/java/io/strimzi/kafka/metrics/KafkaMetricsCollector.java b/src/main/java/io/strimzi/kafka/metrics/KafkaMetricsCollector.java
index b8cfa51..ca5c845 100644
--- a/src/main/java/io/strimzi/kafka/metrics/KafkaMetricsCollector.java
+++ b/src/main/java/io/strimzi/kafka/metrics/KafkaMetricsCollector.java
@@ -31,11 +31,21 @@ public class KafkaMetricsCollector extends Collector {
     @SuppressFBWarnings({"UWF_FIELD_NOT_INITIALIZED_IN_CONSTRUCTOR"}) // Should be investigated as part of https://github.com/strimzi/metrics-reporter/issues/12
     private String prefix;
 
+    /**
+     * Constructs a new KafkaMetricsCollector with provided configuration.
+     *
+     * @param config The configuration for the PrometheusMetricsReporter.
+     */
     public KafkaMetricsCollector(PrometheusMetricsReporterConfig config) {
         this.config = config;
         this.metrics = new ConcurrentHashMap<>();
     }
 
+    /**
+     * Sets the prefix to be used for metric names.
+     *
+     * @param prefix The prefix to set.
+     */
     public void setPrefix(String prefix) {
         this.prefix = prefix;
     }
@@ -65,10 +75,20 @@ public List<MetricFamilySamples> collect() {
         return samples;
     }
 
+    /**
+     * Adds a Kafka metric to be collected.
+     *
+     * @param metric The Kafka metric to add.
+     */
     public void addMetric(KafkaMetric metric) {
         metrics.put(metric.metricName(), metric);
     }
 
+    /**
+     * Removes a Kafka metric from collection.
+     *
+     * @param metric The Kafka metric to remove.
+     */
     public void removeMetric(KafkaMetric metric) {
         metrics.remove(metric.metricName());
     }
diff --git a/src/main/java/io/strimzi/kafka/metrics/KafkaPrometheusMetricsReporter.java b/src/main/java/io/strimzi/kafka/metrics/KafkaPrometheusMetricsReporter.java
index 2863f71..28939b4 100644
--- a/src/main/java/io/strimzi/kafka/metrics/KafkaPrometheusMetricsReporter.java
+++ b/src/main/java/io/strimzi/kafka/metrics/KafkaPrometheusMetricsReporter.java
@@ -89,6 +89,12 @@ public void contextChange(MetricsContext metricsContext) {
         kafkaMetricsCollector.setPrefix(prefix);
     }
 
+    /**
+     *
+     Retrieves the port number on which the HTTP server is running.
+     *
+     @return The port number of the HTTP server.
+     */
     public int getPort() {
         return httpServer.get().getPort();
     }
diff --git a/src/main/java/io/strimzi/kafka/metrics/MetricFamilySamplesBuilder.java b/src/main/java/io/strimzi/kafka/metrics/MetricFamilySamplesBuilder.java
index abf0754..621be19 100644
--- a/src/main/java/io/strimzi/kafka/metrics/MetricFamilySamplesBuilder.java
+++ b/src/main/java/io/strimzi/kafka/metrics/MetricFamilySamplesBuilder.java
@@ -22,6 +22,12 @@ public class MetricFamilySamplesBuilder {
     private final String help;
     private final List<Collector.MetricFamilySamples.Sample> samples;
 
+    /**
+     * Constructor for MetricFamilySamplesBuilder.
+     *
+     * @param type The type of the metric family.
+     * @param help The help string for the metric family.
+     */
     public MetricFamilySamplesBuilder(Collector.Type type, String help) {
         this.type = type;
         this.help = help;
diff --git a/src/main/java/io/strimzi/kafka/metrics/YammerMetricsCollector.java b/src/main/java/io/strimzi/kafka/metrics/YammerMetricsCollector.java
index fd573ad..fc33c75 100644
--- a/src/main/java/io/strimzi/kafka/metrics/YammerMetricsCollector.java
+++ b/src/main/java/io/strimzi/kafka/metrics/YammerMetricsCollector.java
@@ -38,6 +38,11 @@ public class YammerMetricsCollector extends Collector {
     private final List<MetricsRegistry> registries;
     private final PrometheusMetricsReporterConfig config;
 
+    /**
+     * Constructs a new YammerMetricsCollector with the provided configuration.
+     *
+     * @param config The configuration for the YammerMetricsCollector.
+     */
     public YammerMetricsCollector(PrometheusMetricsReporterConfig config) {
         this.config = config;
         this.registries = Arrays.asList(KafkaYammerMetrics.defaultRegistry(), Metrics.defaultRegistry());