diff --git a/arquillian/managed/src/main/java/cloud/piranha/arquillian/managed/ManagedPiranhaContainer.java b/arquillian/managed/src/main/java/cloud/piranha/arquillian/managed/ManagedPiranhaContainer.java
index e127470cf..0d079a3af 100644
--- a/arquillian/managed/src/main/java/cloud/piranha/arquillian/managed/ManagedPiranhaContainer.java
+++ b/arquillian/managed/src/main/java/cloud/piranha/arquillian/managed/ManagedPiranhaContainer.java
@@ -108,11 +108,13 @@ public void setup(ManagedPiranhaContainerConfiguration configuration) {
         this.configuration = configuration;
     }
 
+    @SuppressWarnings("exports")
     @Override
     public ProtocolDescription getDefaultProtocol() {
         return new ProtocolDescription(configuration.getProtocol());
     }
 
+    @SuppressWarnings("exports")
     @Override
     public ProtocolMetaData deploy(Archive<?> archive) throws DeploymentException {
         LOGGER.log(INFO, "Deploying " + archive.getName());
@@ -300,6 +302,7 @@ private String convertGroupIdToPath(String groupId) {
      * @return the URL.
      * @throws IOException when an I/O error occurs.
      */
+    @SuppressWarnings("deprecation")
     private URL createMavenCentralArtifactUrl(String groupId, String artifactId, String version, String type) throws IOException {
         return new URL("https://repo1.maven.org/maven2/" + createArtifactPath(groupId, artifactId, version, type));
     }
diff --git a/arquillian/managed/src/main/java/cloud/piranha/arquillian/managed/ManagedPiranhaContainerExtension.java b/arquillian/managed/src/main/java/cloud/piranha/arquillian/managed/ManagedPiranhaContainerExtension.java
index 910d3400c..f82b8f4d0 100644
--- a/arquillian/managed/src/main/java/cloud/piranha/arquillian/managed/ManagedPiranhaContainerExtension.java
+++ b/arquillian/managed/src/main/java/cloud/piranha/arquillian/managed/ManagedPiranhaContainerExtension.java
@@ -43,6 +43,7 @@ public class ManagedPiranhaContainerExtension implements LoadableExtension {
     public ManagedPiranhaContainerExtension() {
     }
 
+    @SuppressWarnings("exports")
     @Override
     public void register(ExtensionBuilder extensionBuilder) {
         extensionBuilder.service(DeployableContainer.class, ManagedPiranhaContainer.class);
diff --git a/core/impl/src/main/java/cloud/piranha/core/impl/CookieParser.java b/core/impl/src/main/java/cloud/piranha/core/impl/CookieParser.java
index 8a4587d76..775ee5cb2 100644
--- a/core/impl/src/main/java/cloud/piranha/core/impl/CookieParser.java
+++ b/core/impl/src/main/java/cloud/piranha/core/impl/CookieParser.java
@@ -80,7 +80,7 @@ private static Cookie[] parseNetscape(String cookiesValue) {
         return cookieList.toArray(new Cookie[0]);
     }
 
-    @SuppressWarnings({"deprecation", "removal"})
+    @SuppressWarnings({"removal"})
     private static Cookie[] parseRFC2109(String cookiesValue) {
         List<Cookie> cookieList = new ArrayList<>();
         String[] cookieCandidates = cookiesValue.split("[;,]");
diff --git a/core/impl/src/main/java/cloud/piranha/core/impl/DefaultAnnotationManager.java b/core/impl/src/main/java/cloud/piranha/core/impl/DefaultAnnotationManager.java
index 819c1b91a..d4a95bb15 100644
--- a/core/impl/src/main/java/cloud/piranha/core/impl/DefaultAnnotationManager.java
+++ b/core/impl/src/main/java/cloud/piranha/core/impl/DefaultAnnotationManager.java
@@ -59,6 +59,7 @@ public void addAnnotatedClass(Class<? extends Annotation> annotationClass, Class
             classes.add(clazz);
             annotatedClasses.put(annotationClass, classes);
         } else {
+            @SuppressWarnings({ "rawtypes", "unchecked" })
             HashSet<Class<?>> classes = (HashSet) annotatedClasses.get(annotationClass);
             classes.add(clazz);
         }
@@ -108,6 +109,7 @@ public Set<Class<?>> getAnnotatedClass(Class<? extends Annotation> annotationCla
         return annotatedClasses.getOrDefault(annotationClass, Collections.emptySet());
     }
 
+    @SuppressWarnings("unchecked")
     @Override
     public Set<Class<?>> getAnnotatedClasses(Class<?>[] annotationClasses) {
         HashSet<Class<?>> result = new HashSet<>();
diff --git a/core/impl/src/main/java/cloud/piranha/core/impl/DefaultModuleFinder.java b/core/impl/src/main/java/cloud/piranha/core/impl/DefaultModuleFinder.java
index 3eb5f2183..afbee51c8 100644
--- a/core/impl/src/main/java/cloud/piranha/core/impl/DefaultModuleFinder.java
+++ b/core/impl/src/main/java/cloud/piranha/core/impl/DefaultModuleFinder.java
@@ -200,6 +200,7 @@ private void addProviders(ModuleDescriptor.Builder builder, Resource resource) {
             InputStream inputStream = resource.getResourceAsStream(providerFile);
             if (inputStream == null)
                 continue;
+            @SuppressWarnings("resource")
             List<String> providerList = new BufferedReader(new InputStreamReader(inputStream, StandardCharsets.UTF_8))
                     .lines()
                     .filter(x -> !x.startsWith("#"))
diff --git a/core/impl/src/main/java/cloud/piranha/core/impl/DefaultNamedRequestDispatcher.java b/core/impl/src/main/java/cloud/piranha/core/impl/DefaultNamedRequestDispatcher.java
index 5f97df4fb..92fada5dc 100644
--- a/core/impl/src/main/java/cloud/piranha/core/impl/DefaultNamedRequestDispatcher.java
+++ b/core/impl/src/main/java/cloud/piranha/core/impl/DefaultNamedRequestDispatcher.java
@@ -111,7 +111,6 @@ public void include(ServletRequest servletRequest, ServletResponse servletRespon
             throws ServletException, IOException {
 
         WebApplicationRequest request = unwrap(servletRequest);
-        WebApplicationResponse response = unwrap(servletResponse);
 
         /* - JAVADOC, Servlet:SPEC:192
          *
diff --git a/core/impl/src/main/java/cloud/piranha/core/impl/DefaultPushBuilder.java b/core/impl/src/main/java/cloud/piranha/core/impl/DefaultPushBuilder.java
index 65dc96157..3e9877bd5 100644
--- a/core/impl/src/main/java/cloud/piranha/core/impl/DefaultPushBuilder.java
+++ b/core/impl/src/main/java/cloud/piranha/core/impl/DefaultPushBuilder.java
@@ -63,6 +63,7 @@ public class DefaultPushBuilder implements PushBuilder {
     /**
      * Stores the web application request.
      */
+    @SuppressWarnings("unused")
     private final WebApplicationRequest request;
     
     /**
diff --git a/core/impl/src/main/java/cloud/piranha/core/impl/DefaultWebApplicationBuilder.java b/core/impl/src/main/java/cloud/piranha/core/impl/DefaultWebApplicationBuilder.java
index f4464f76b..b27aaee4f 100644
--- a/core/impl/src/main/java/cloud/piranha/core/impl/DefaultWebApplicationBuilder.java
+++ b/core/impl/src/main/java/cloud/piranha/core/impl/DefaultWebApplicationBuilder.java
@@ -98,6 +98,7 @@ public DefaultWebApplicationBuilder() {
      *
      * @return the web application.
      */
+    @SuppressWarnings("unchecked")
     public DefaultWebApplication build() {
         DefaultWebApplication webApplication = new DefaultWebApplication();
         for (Resource resource : resources) {
diff --git a/core/impl/src/test/java/cloud/piranha/core/impl/DefaultWebConnectionTest.java b/core/impl/src/test/java/cloud/piranha/core/impl/DefaultWebConnectionTest.java
index be48baa9f..2f4d0b7c5 100644
--- a/core/impl/src/test/java/cloud/piranha/core/impl/DefaultWebConnectionTest.java
+++ b/core/impl/src/test/java/cloud/piranha/core/impl/DefaultWebConnectionTest.java
@@ -57,6 +57,7 @@ void testClose() throws Exception {
     @Test
     void testGetInputStream() throws Exception {
         DefaultWebApplicationRequest request = new DefaultWebApplicationRequest();
+        @SuppressWarnings("resource")
         DefaultWebConnection connection = new DefaultWebConnection(request, null);
         assertNotNull(connection.getInputStream());
     }
@@ -67,6 +68,7 @@ void testGetInputStream() throws Exception {
     @Test
     void testGetOutputStream() throws Exception {
         DefaultWebApplicationResponse response = new DefaultWebApplicationResponse();
+        @SuppressWarnings("resource")
         DefaultWebConnection connection = new DefaultWebConnection(null, response);
         assertNotNull(connection.getOutputStream());
     }
diff --git a/core/impl/src/test/java/cloud/piranha/core/impl/HttpSessionTest.java b/core/impl/src/test/java/cloud/piranha/core/impl/HttpSessionTest.java
index 0413717e0..e876a54cd 100644
--- a/core/impl/src/test/java/cloud/piranha/core/impl/HttpSessionTest.java
+++ b/core/impl/src/test/java/cloud/piranha/core/impl/HttpSessionTest.java
@@ -1341,6 +1341,7 @@ void testSetSessionTimeoutWithMultipleTimeouts() {
      */
     @Test
     void testSetSessionTrackingModesWithEmptyHashSet() {
+        @SuppressWarnings({ "rawtypes", "unchecked" })
         WebApplication webApplication = new DefaultWebApplicationBuilder()
                 .sessionTrackingModes(new HashSet())
                 .build();
diff --git a/core/impl/src/test/java/cloud/piranha/core/impl/TestHttpServerRequest.java b/core/impl/src/test/java/cloud/piranha/core/impl/TestHttpServerRequest.java
index afa54ac1f..ba63628b9 100644
--- a/core/impl/src/test/java/cloud/piranha/core/impl/TestHttpServerRequest.java
+++ b/core/impl/src/test/java/cloud/piranha/core/impl/TestHttpServerRequest.java
@@ -88,6 +88,7 @@ public boolean isSecure() {
     /**
      * Stores the query string.
      */
+    @SuppressWarnings("unused")
     private String queryString;
 
     /**