diff --git a/crd-generator/collector/src/main/java/io/fabric8/crd/generator/collector/CustomResourceClassLoader.java b/crd-generator/collector/src/main/java/io/fabric8/crd/generator/collector/CustomResourceClassLoader.java
index b1b655d391f..f231387e98f 100644
--- a/crd-generator/collector/src/main/java/io/fabric8/crd/generator/collector/CustomResourceClassLoader.java
+++ b/crd-generator/collector/src/main/java/io/fabric8/crd/generator/collector/CustomResourceClassLoader.java
@@ -43,11 +43,13 @@ class CustomResourceClassLoader {
 
   private ClassLoader cachedClassLoader;
 
+  @SuppressWarnings("UnusedReturnValue")
   public CustomResourceClassLoader withParentClassLoader(ClassLoader parentClassLoader) {
     this.parentClassLoader = parentClassLoader;
     return this;
   }
 
+  @SuppressWarnings("UnusedReturnValue")
   public CustomResourceClassLoader withClasspathElement(String... classpathElements) {
     if (classpathElements != null) {
       withClasspathElements(Arrays.asList(classpathElements));
@@ -55,6 +57,7 @@ public CustomResourceClassLoader withClasspathElement(String... classpathElement
     return this;
   }
 
+  @SuppressWarnings("UnusedReturnValue")
   public CustomResourceClassLoader withClasspathElements(Collection<String> classpathElements) {
     if (classpathElements != null) {
       classpathElements.stream()
diff --git a/crd-generator/collector/src/main/java/io/fabric8/crd/generator/collector/CustomResourceCollector.java b/crd-generator/collector/src/main/java/io/fabric8/crd/generator/collector/CustomResourceCollector.java
index d3b13ca8adc..fe46c3ce7f6 100644
--- a/crd-generator/collector/src/main/java/io/fabric8/crd/generator/collector/CustomResourceCollector.java
+++ b/crd-generator/collector/src/main/java/io/fabric8/crd/generator/collector/CustomResourceCollector.java
@@ -69,6 +69,7 @@ public CustomResourceCollector withParentClassLoader(ClassLoader classLoader) {
     return this;
   }
 
+  @SuppressWarnings("UnusedReturnValue")
   public CustomResourceCollector withClasspathElement(String... classpathElement) {
     this.customResourceClassLoader.withClasspathElement(classpathElement);
     return this;
@@ -79,6 +80,7 @@ public CustomResourceCollector withClasspathElements(Collection<String> classpat
     return this;
   }
 
+  @SuppressWarnings("UnusedReturnValue")
   public CustomResourceCollector withCustomResourceClass(String... className) {
     if (className != null) {
       withCustomResourceClasses(Arrays.asList(className));
@@ -86,6 +88,7 @@ public CustomResourceCollector withCustomResourceClass(String... className) {
     return this;
   }
 
+  @SuppressWarnings("UnusedReturnValue")
   public CustomResourceCollector withCustomResourceClasses(Collection<String> classNames) {
     if (classNames != null) {
       classNames.stream()
@@ -95,11 +98,13 @@ public CustomResourceCollector withCustomResourceClasses(Collection<String> clas
     return this;
   }
 
+  @SuppressWarnings("UnusedReturnValue")
   public CustomResourceCollector withIndex(IndexView... index) {
     jandexCustomResourceClassScanner.withIndex(index);
     return this;
   }
 
+  @SuppressWarnings("UnusedReturnValue")
   public CustomResourceCollector withIndices(Collection<IndexView> indices) {
     jandexCustomResourceClassScanner.withIndices(indices);
     return this;
diff --git a/crd-generator/collector/src/main/java/io/fabric8/crd/generator/collector/JandexCustomResourceClassScanner.java b/crd-generator/collector/src/main/java/io/fabric8/crd/generator/collector/JandexCustomResourceClassScanner.java
index bcc69fbb882..c884b0778ea 100644
--- a/crd-generator/collector/src/main/java/io/fabric8/crd/generator/collector/JandexCustomResourceClassScanner.java
+++ b/crd-generator/collector/src/main/java/io/fabric8/crd/generator/collector/JandexCustomResourceClassScanner.java
@@ -58,11 +58,13 @@ public class JandexCustomResourceClassScanner {
    */
   private boolean forceIndex = false;
 
+  @SuppressWarnings("UnusedReturnValue")
   public JandexCustomResourceClassScanner withForceIndex(boolean forceIndex) {
     this.forceIndex = forceIndex;
     return this;
   }
 
+  @SuppressWarnings("UnusedReturnValue")
   public JandexCustomResourceClassScanner withIndex(IndexView... index) {
     if (index != null) {
       withIndices(Arrays.asList(index));
@@ -70,6 +72,7 @@ public JandexCustomResourceClassScanner withIndex(IndexView... index) {
     return this;
   }
 
+  @SuppressWarnings("UnusedReturnValue")
   public JandexCustomResourceClassScanner withIndices(Collection<IndexView> indices) {
     if (indices != null) {
       indices.stream()
@@ -79,6 +82,7 @@ public JandexCustomResourceClassScanner withIndices(Collection<IndexView> indice
     return this;
   }
 
+  @SuppressWarnings("UnusedReturnValue")
   public JandexCustomResourceClassScanner withFileToScan(File... files) {
     if (files != null) {
       withFilesToScan(Arrays.asList(files));
@@ -86,6 +90,7 @@ public JandexCustomResourceClassScanner withFileToScan(File... files) {
     return this;
   }
 
+  @SuppressWarnings("UnusedReturnValue")
   public JandexCustomResourceClassScanner withFilesToScan(Collection<File> files) {
     if (files != null) {
       files.stream()
diff --git a/crd-generator/collector/src/main/java/io/fabric8/crd/generator/collector/JandexIndexer.java b/crd-generator/collector/src/main/java/io/fabric8/crd/generator/collector/JandexIndexer.java
index ffd182b4b2a..0d4c039cd4c 100644
--- a/crd-generator/collector/src/main/java/io/fabric8/crd/generator/collector/JandexIndexer.java
+++ b/crd-generator/collector/src/main/java/io/fabric8/crd/generator/collector/JandexIndexer.java
@@ -52,6 +52,7 @@ class JandexIndexer {
   private long maxBytesReadFromJar = 100000000; // 100 MB
   private long maxClassFileSize = 1000000; // 1 MB
 
+  @SuppressWarnings("UnusedReturnValue")
   public JandexIndexer withMaxJarEntries(int maxJarEntries) {
     if (maxJarEntries < 1)
       throw new IllegalArgumentException("maxJarEntries must be greater than 0");
@@ -59,6 +60,7 @@ public JandexIndexer withMaxJarEntries(int maxJarEntries) {
     return this;
   }
 
+  @SuppressWarnings("UnusedReturnValue")
   public JandexIndexer withMaxClassFileSize(int maxClassFileSize) {
     if (maxClassFileSize < 10)
       throw new IllegalArgumentException("maxClassFileSize must be greater than 10");
@@ -66,6 +68,7 @@ public JandexIndexer withMaxClassFileSize(int maxClassFileSize) {
     return this;
   }
 
+  @SuppressWarnings("UnusedReturnValue")
   public JandexIndexer withMaxBytesReadFromJar(long maxBytesReadFromJar) {
     if (maxBytesReadFromJar < 10)
       throw new IllegalArgumentException("maxBytesReadFromJar must be greater than 10");
@@ -161,6 +164,7 @@ private long addToIndex(JarFile zip, JarEntry entry, Indexer indexer) {
     }
   }
 
+  @SuppressWarnings("UnusedReturnValue")
   private long addToIndex(Path file, Indexer indexer) {
     try (InputStream in = Files.newInputStream(file)) {
       return addToIndex(in, indexer);