diff --git a/streampipes-client/src/main/java/org/apache/streampipes/client/api/AbstractClientApi.java b/streampipes-client/src/main/java/org/apache/streampipes/client/api/AbstractClientApi.java
index c4df217fee..fdf3c1a86a 100644
--- a/streampipes-client/src/main/java/org/apache/streampipes/client/api/AbstractClientApi.java
+++ b/streampipes-client/src/main/java/org/apache/streampipes/client/api/AbstractClientApi.java
@@ -17,6 +17,7 @@
  */
 package org.apache.streampipes.client.api;
 
+
 import org.apache.streampipes.client.http.DeleteRequest;
 import org.apache.streampipes.client.http.GetRequest;
 import org.apache.streampipes.client.http.PostRequestWithPayloadResponse;
@@ -30,6 +31,8 @@
 import org.apache.streampipes.commons.exceptions.SpHttpErrorStatusCode;
 import org.apache.streampipes.commons.exceptions.SpRuntimeException;
 
+import org.apache.http.HttpStatus;
+
 import java.util.Optional;
 
 public class AbstractClientApi {
@@ -89,7 +92,7 @@ protected <T> Optional<T> getSingleOpt(StreamPipesApiPath apiPath,
       ObjectSerializer<Void, T> serializer = new ObjectSerializer<>();
       return Optional.of(new GetRequest<>(clientConfig, apiPath, targetClass, serializer).executeRequest());
     } catch (SpHttpErrorStatusCode e) {
-      if (e.getHttpStatusCode() == 404) {
+      if (e.getHttpStatusCode() == HttpStatus.SC_NOT_FOUND) {
         return Optional.empty();
       } else {
         throw e;
diff --git a/streampipes-client/src/main/java/org/apache/streampipes/client/api/AbstractTypedClientApi.java b/streampipes-client/src/main/java/org/apache/streampipes/client/api/AbstractTypedClientApi.java
index ff3964bd8e..a905893ca4 100644
--- a/streampipes-client/src/main/java/org/apache/streampipes/client/api/AbstractTypedClientApi.java
+++ b/streampipes-client/src/main/java/org/apache/streampipes/client/api/AbstractTypedClientApi.java
@@ -25,6 +25,8 @@
 import org.apache.streampipes.commons.exceptions.SpHttpErrorStatusCode;
 import org.apache.streampipes.commons.exceptions.SpRuntimeException;
 
+import org.apache.http.HttpStatus;
+
 import java.util.List;
 import java.util.Optional;
 
@@ -47,7 +49,7 @@ protected Optional<T> getSingle(StreamPipesApiPath apiPath) throws SpRuntimeExce
     try {
       return Optional.of(new GetRequest<>(clientConfig, apiPath, targetClass, serializer).executeRequest());
     } catch (SpHttpErrorStatusCode e) {
-      if (e.getHttpStatusCode() == 404) {
+      if (e.getHttpStatusCode() == HttpStatus.SC_NOT_FOUND) {
         return Optional.empty();
       } else {
         throw e;
diff --git a/streampipes-client/src/main/java/org/apache/streampipes/client/http/HttpRequest.java b/streampipes-client/src/main/java/org/apache/streampipes/client/http/HttpRequest.java
index c11275c285..52399ef96e 100644
--- a/streampipes-client/src/main/java/org/apache/streampipes/client/http/HttpRequest.java
+++ b/streampipes-client/src/main/java/org/apache/streampipes/client/http/HttpRequest.java
@@ -104,9 +104,10 @@ public T executeRequest() {
         switch (status.getStatusCode()) {
           case HttpStatus.SC_UNAUTHORIZED -> throw new SpHttpErrorStatusCode(
               " 401 - Access to this resource is forbidden - did you provide a poper API key or client secret?",
-              401);
+              HttpStatus.SC_UNAUTHORIZED);
           case HttpStatus.SC_NOT_FOUND ->
-              throw new SpHttpErrorStatusCode(" 404 - The requested resource could not be found.", 404);
+              throw new SpHttpErrorStatusCode(" 404 - The requested resource could not be found.",
+                      HttpStatus.SC_NOT_FOUND);
           default -> throw new SpHttpErrorStatusCode(status.getStatusCode() + " - " + status.getReasonPhrase(),
               status.getStatusCode());
         }
diff --git a/streampipes-connect-management/src/main/java/org/apache/streampipes/connect/management/management/WorkerRestClient.java b/streampipes-connect-management/src/main/java/org/apache/streampipes/connect/management/management/WorkerRestClient.java
index c45506d0f5..a551201e29 100644
--- a/streampipes-connect-management/src/main/java/org/apache/streampipes/connect/management/management/WorkerRestClient.java
+++ b/streampipes-connect-management/src/main/java/org/apache/streampipes/connect/management/management/WorkerRestClient.java
@@ -18,6 +18,7 @@
 
 package org.apache.streampipes.connect.management.management;
 
+
 import org.apache.streampipes.commons.exceptions.SpConfigurationException;
 import org.apache.streampipes.commons.exceptions.connect.AdapterException;
 import org.apache.streampipes.connect.management.util.WorkerPaths;
@@ -35,6 +36,7 @@
 import com.fasterxml.jackson.databind.ObjectMapper;
 import org.apache.commons.io.IOUtils;
 import org.apache.http.HttpResponse;
+import org.apache.http.HttpStatus;
 import org.apache.http.client.fluent.Request;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -106,7 +108,7 @@ private static void triggerAdapterStateChange(AdapterDescription ad,
       var response = triggerPost(url, ad.getCorrespondingDataStreamElementId(), adapterDescription);
       var responseString = getResponseBody(response);
 
-      if (response.getStatusLine().getStatusCode() != 200) {
+      if (response.getStatusLine().getStatusCode() != HttpStatus.SC_OK) {
         var exception = getSerializer().readValue(responseString, AdapterException.class);
         throw new AdapterException(exception.getMessage(), exception.getCause());
       }
@@ -144,7 +146,7 @@ public static RuntimeOptionsResponse getConfiguration(String workerEndpoint,
 
       String responseString = IOUtils.toString(response.getEntity().getContent(), StandardCharsets.UTF_8);
 
-      if (response.getStatusLine().getStatusCode() == 200) {
+      if (response.getStatusLine().getStatusCode() == HttpStatus.SC_OK) {
         return getSerializer().readValue(responseString, RuntimeOptionsResponse.class);
       } else {
         var exception = getSerializer().readValue(responseString, SpConfigurationException.class);
diff --git a/streampipes-extensions/streampipes-connect-adapters/src/main/java/org/apache/streampipes/connect/adapters/netio/NetioRestAdapter.java b/streampipes-extensions/streampipes-connect-adapters/src/main/java/org/apache/streampipes/connect/adapters/netio/NetioRestAdapter.java
index 02b7ee85ce..998115bc5d 100644
--- a/streampipes-extensions/streampipes-connect-adapters/src/main/java/org/apache/streampipes/connect/adapters/netio/NetioRestAdapter.java
+++ b/streampipes-extensions/streampipes-connect-adapters/src/main/java/org/apache/streampipes/connect/adapters/netio/NetioRestAdapter.java
@@ -18,6 +18,7 @@
 
 package org.apache.streampipes.connect.adapters.netio;
 
+
 import org.apache.streampipes.commons.exceptions.connect.AdapterException;
 import org.apache.streampipes.connect.adapters.netio.model.NetioAllPowerOutputs;
 import org.apache.streampipes.connect.adapters.netio.model.NetioPowerOutput;
@@ -41,6 +42,7 @@
 
 import com.google.gson.Gson;
 import org.apache.http.HttpHost;
+import org.apache.http.HttpStatus;
 import org.apache.http.client.HttpResponseException;
 import org.apache.http.client.fluent.Executor;
 import org.apache.http.client.fluent.Request;
@@ -159,7 +161,8 @@ public GuessSchema onSchemaRequested(IAdapterParameterExtractor extractor,
       requestData();
       return NetioUtils.getNetioSchema();
     } catch (IOException e) {
-      if (e instanceof HttpResponseException && ((HttpResponseException) e).getStatusCode() == 401) {
+      if (e instanceof HttpResponseException && ((HttpResponseException) e).getStatusCode()
+              == HttpStatus.SC_UNAUTHORIZED) {
         throw new AdapterException(
             "Unauthorized! Could not connect to NETIO sensor: " + this.ip + " with username " + this.username);
       } else {
diff --git a/streampipes-extensions/streampipes-connect-adapters/src/test/java/org/apache/streampipes/connect/adapters/PullAdapterTest.java b/streampipes-extensions/streampipes-connect-adapters/src/test/java/org/apache/streampipes/connect/adapters/PullAdapterTest.java
index a0fd6860ed..dba72aa857 100644
--- a/streampipes-extensions/streampipes-connect-adapters/src/test/java/org/apache/streampipes/connect/adapters/PullAdapterTest.java
+++ b/streampipes-extensions/streampipes-connect-adapters/src/test/java/org/apache/streampipes/connect/adapters/PullAdapterTest.java
@@ -31,7 +31,7 @@
 //
 //        stubFor(get(urlEqualTo("/"))
 //                .willReturn(aResponse()
-//                        .withStatus(200)
+//                        .withStatus(HttpStatus.SC_OK)
 //                        .withBody(expected)));
 //
 //        String result = PullRestAdapter.getDataFromEndpointString("http://localhost:" + port + "/");
@@ -44,7 +44,7 @@
 //    public void getDataFromEndpointStringFail() throws AdapterException {
 //        stubFor(get(urlEqualTo("/"))
 //                .willReturn(aResponse()
-//                        .withStatus(404)
+//                        .withStatus(HttpStatus.SC_NOT_FOUND)
 //                        .withBody("")));
 //
 //        PullRestAdapter.getDataFromEndpointString("http://localhost:" + port + "/");
diff --git a/streampipes-extensions/streampipes-connect-adapters/src/test/java/org/apache/streampipes/connect/adapters/generic/protocol/stream/HttpProtocolTest.java b/streampipes-extensions/streampipes-connect-adapters/src/test/java/org/apache/streampipes/connect/adapters/generic/protocol/stream/HttpProtocolTest.java
index aca6ca2886..8ec18728e8 100644
--- a/streampipes-extensions/streampipes-connect-adapters/src/test/java/org/apache/streampipes/connect/adapters/generic/protocol/stream/HttpProtocolTest.java
+++ b/streampipes-extensions/streampipes-connect-adapters/src/test/java/org/apache/streampipes/connect/adapters/generic/protocol/stream/HttpProtocolTest.java
@@ -30,7 +30,7 @@
 //
 //        stubFor(get(urlEqualTo("/"))
 //                .willReturn(aResponse()
-//                        .withStatus(200)
+//                        .withStatus(HttpStatus.SC_OK)
 //                        .withBody(expected)));
 //
 //
@@ -77,7 +77,7 @@
 //
 //        stubFor(get(urlEqualTo("/"))
 //                .willReturn(aResponse()
-//                        .withStatus(200)
+//                        .withStatus(HttpStatus.SC_OK)
 //                        .withBody("Example response")));
 //
 //
diff --git a/streampipes-integration-tests/pom.xml b/streampipes-integration-tests/pom.xml
index 4cb2c98760..024207d21e 100644
--- a/streampipes-integration-tests/pom.xml
+++ b/streampipes-integration-tests/pom.xml
@@ -111,6 +111,10 @@
       <artifactId>mockito-core</artifactId>
       <scope>test</scope>
     </dependency>
+    <dependency>
+      <groupId>org.apache.httpcomponents</groupId>
+      <artifactId>httpcore</artifactId>
+    </dependency>
   </dependencies>
 
   <build>
diff --git a/streampipes-integration-tests/src/test/java/org/apache/streampipes/integration/containers/PulsarContainer.java b/streampipes-integration-tests/src/test/java/org/apache/streampipes/integration/containers/PulsarContainer.java
index a21089d108..cb47a856e5 100644
--- a/streampipes-integration-tests/src/test/java/org/apache/streampipes/integration/containers/PulsarContainer.java
+++ b/streampipes-integration-tests/src/test/java/org/apache/streampipes/integration/containers/PulsarContainer.java
@@ -17,6 +17,7 @@
  */
 package org.apache.streampipes.integration.containers;
 
+import org.apache.http.HttpStatus;
 import org.testcontainers.containers.GenericContainer;
 import org.testcontainers.containers.wait.strategy.HttpWaitStrategy;
 
@@ -35,7 +36,7 @@ public PulsarContainer() {
   public void start() {
     this.waitStrategy = new HttpWaitStrategy()
         .forPort(BROKER_HTTP_PORT)
-        .forStatusCode(200)
+        .forStatusCode(HttpStatus.SC_OK)
         .forPath("/admin/v2/namespaces/public/default")
         .withStartupTimeout(Duration.of(300, SECONDS));
     this.withExposedPorts(BROKER_SERVICE_PORT, BROKER_HTTP_PORT);
diff --git a/streampipes-pipeline-management/src/main/java/org/apache/streampipes/manager/health/ServiceHealthCheck.java b/streampipes-pipeline-management/src/main/java/org/apache/streampipes/manager/health/ServiceHealthCheck.java
index fda4741a3e..71842d5925 100644
--- a/streampipes-pipeline-management/src/main/java/org/apache/streampipes/manager/health/ServiceHealthCheck.java
+++ b/streampipes-pipeline-management/src/main/java/org/apache/streampipes/manager/health/ServiceHealthCheck.java
@@ -18,11 +18,13 @@
 
 package org.apache.streampipes.manager.health;
 
+
 import org.apache.streampipes.manager.execution.ExtensionServiceExecutions;
 import org.apache.streampipes.model.extensions.svcdiscovery.SpServiceRegistration;
 import org.apache.streampipes.storage.api.CRUDStorage;
 import org.apache.streampipes.storage.management.StorageDispatcher;
 
+import org.apache.http.HttpStatus;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -53,7 +55,7 @@ private void checkServiceHealth(SpServiceRegistration service) {
     try {
       var request = ExtensionServiceExecutions.extServiceGetRequest(healthCheckUrl);
       var response = request.execute();
-      if (response.returnResponse().getStatusLine().getStatusCode() != 200) {
+      if (response.returnResponse().getStatusLine().getStatusCode() != HttpStatus.SC_OK) {
         processUnhealthyService(service);
       } else {
         if (!service.isHealthy()) {
diff --git a/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/AbstractExtensionsResource.java b/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/AbstractExtensionsResource.java
index 375b75dba0..9854c20420 100644
--- a/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/AbstractExtensionsResource.java
+++ b/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/AbstractExtensionsResource.java
@@ -18,6 +18,8 @@
 
 package org.apache.streampipes.rest.extensions;
 
+import org.apache.http.HttpStatus;
+
 import jakarta.ws.rs.core.Response;
 
 public class AbstractExtensionsResource {
@@ -31,13 +33,13 @@ protected <T> Response ok(T entity) {
 
   protected Response clientError() {
     return Response
-        .status(400)
+        .status(HttpStatus.SC_BAD_REQUEST)
         .build();
   }
 
   protected Response serverError() {
     return Response
-        .status(500)
+        .status(HttpStatus.SC_INTERNAL_SERVER_ERROR)
         .build();
   }
 
diff --git a/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/AbstractPipelineElementResource.java b/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/AbstractPipelineElementResource.java
index eb0eeb47d8..4ff9621ab1 100644
--- a/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/AbstractPipelineElementResource.java
+++ b/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/AbstractPipelineElementResource.java
@@ -33,6 +33,7 @@
 
 import com.google.common.base.Charsets;
 import com.google.common.io.Resources;
+import org.apache.http.HttpStatus;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -88,7 +89,7 @@ public Response getIconAsset(@PathParam("appId") String appId) throws IOExceptio
       return ok(Resources.toByteArray(iconUrl));
     } catch (IllegalArgumentException e) {
       LOG.warn("No icon resource found for pipeline element {}", appId);
-      return Response.status(400).build();
+      return Response.status(HttpStatus.SC_BAD_REQUEST).build();
     }
   }
 
@@ -101,7 +102,7 @@ public Response getDocumentationAsset(@PathParam("id") String elementId) throws
       return ok(Resources.toString(documentationUrl, Charsets.UTF_8));
     } catch (IllegalArgumentException e) {
       LOG.warn("No documentation resource found for pipeline element {}", elementId);
-      return Response.status(400).build();
+      return Response.status(HttpStatus.SC_BAD_REQUEST).build();
     }
   }
 
diff --git a/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/connect/HttpServerAdapterResource.java b/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/connect/HttpServerAdapterResource.java
index 382295aa0f..70fea2aa42 100644
--- a/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/connect/HttpServerAdapterResource.java
+++ b/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/connect/HttpServerAdapterResource.java
@@ -19,6 +19,8 @@
 
 import org.apache.streampipes.extensions.management.connect.HttpServerAdapterManagement;
 
+import org.apache.http.HttpStatus;
+
 import jakarta.ws.rs.POST;
 import jakarta.ws.rs.Path;
 import jakarta.ws.rs.PathParam;
@@ -36,7 +38,7 @@ public Response receiveEvent(@PathParam("endpointId") String endpointId,
       HttpServerAdapterManagement.INSTANCE.notify(endpointId, body);
       return Response.ok().build();
     } catch (Exception e) {
-      return Response.status(400).entity(e.getMessage()).build();
+      return Response.status(HttpStatus.SC_BAD_REQUEST).entity(e.getMessage()).build();
     }
 
   }
diff --git a/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/connect/RuntimeResolvableResource.java b/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/connect/RuntimeResolvableResource.java
index 8f465f4448..a49616c66b 100644
--- a/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/connect/RuntimeResolvableResource.java
+++ b/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/connect/RuntimeResolvableResource.java
@@ -29,6 +29,8 @@
 import org.apache.streampipes.rest.shared.annotation.JacksonSerialized;
 import org.apache.streampipes.rest.shared.impl.AbstractSharedRestInterface;
 
+import org.apache.http.HttpStatus;
+
 import jakarta.ws.rs.Consumes;
 import jakarta.ws.rs.POST;
 import jakarta.ws.rs.Path;
@@ -65,7 +67,7 @@ public Response fetchConfigurations(@PathParam("id") String elementId,
       }
     } catch (SpConfigurationException e) {
       return jakarta.ws.rs.core.Response
-          .status(400)
+          .status(HttpStatus.SC_BAD_REQUEST)
           .entity(e)
           .build();
     }
diff --git a/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/pe/DataStreamPipelineElementResource.java b/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/pe/DataStreamPipelineElementResource.java
index 5993ee7152..01a62f1a9f 100644
--- a/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/pe/DataStreamPipelineElementResource.java
+++ b/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/pe/DataStreamPipelineElementResource.java
@@ -24,6 +24,8 @@
 import org.apache.streampipes.rest.extensions.AbstractPipelineElementResource;
 import org.apache.streampipes.svcdiscovery.api.model.SpServicePathPrefix;
 
+import org.apache.http.HttpStatus;
+
 import jakarta.ws.rs.GET;
 import jakarta.ws.rs.Path;
 import jakarta.ws.rs.PathParam;
@@ -50,7 +52,7 @@ public jakarta.ws.rs.core.Response getAssets(@PathParam("streamId") String strea
               .getIncludedAssets()).makeZip());
     } catch (IOException e) {
       e.printStackTrace();
-      return jakarta.ws.rs.core.Response.status(500).build();
+      return jakarta.ws.rs.core.Response.status(HttpStatus.SC_INTERNAL_SERVER_ERROR).build();
     }
   }
 
diff --git a/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/pe/InvocablePipelineElementResource.java b/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/pe/InvocablePipelineElementResource.java
index 48005633f5..61e866db90 100644
--- a/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/pe/InvocablePipelineElementResource.java
+++ b/streampipes-rest-extensions/src/main/java/org/apache/streampipes/rest/extensions/pe/InvocablePipelineElementResource.java
@@ -38,6 +38,7 @@
 import org.apache.streampipes.rest.shared.annotation.JacksonSerialized;
 import org.apache.streampipes.sdk.extractor.AbstractParameterExtractor;
 
+import org.apache.http.HttpStatus;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -130,11 +131,11 @@ public jakarta.ws.rs.core.Response fetchConfigurations(@PathParam("elementId") S
             new RuntimeResolvableRequestHandler().handleRuntimeResponse((SupportsRuntimeConfig) declarer, req);
         return ok(responseOptions);
       } else {
-        return jakarta.ws.rs.core.Response.status(500).build();
+        return jakarta.ws.rs.core.Response.status(HttpStatus.SC_INTERNAL_SERVER_ERROR).build();
       }
     } catch (SpConfigurationException e) {
       return jakarta.ws.rs.core.Response
-          .status(400)
+          .status(HttpStatus.SC_BAD_REQUEST)
           .entity(e)
           .build();
     }
diff --git a/streampipes-rest-shared/pom.xml b/streampipes-rest-shared/pom.xml
index 98a36fd340..b29cbed3f2 100644
--- a/streampipes-rest-shared/pom.xml
+++ b/streampipes-rest-shared/pom.xml
@@ -63,6 +63,10 @@
             <groupId>org.glassfish.jersey.media</groupId>
             <artifactId>jersey-media-multipart</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.apache.httpcomponents</groupId>
+            <artifactId>httpcore</artifactId>
+        </dependency>
 
         <!-- Test dependencies -->
         <dependency>
@@ -95,6 +99,11 @@
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-checkstyle-plugin</artifactId>
+                <configuration>
+                    <propertyExpansion>
+                        checkstyle.config.base.path=${project.parent.basedir}/tools/maven
+                    </propertyExpansion>
+                </configuration>
             </plugin>
         </plugins>
     </build>
diff --git a/streampipes-rest-shared/src/main/java/org/apache/streampipes/rest/shared/impl/AbstractSharedRestInterface.java b/streampipes-rest-shared/src/main/java/org/apache/streampipes/rest/shared/impl/AbstractSharedRestInterface.java
index 2f7211807e..17410a154f 100644
--- a/streampipes-rest-shared/src/main/java/org/apache/streampipes/rest/shared/impl/AbstractSharedRestInterface.java
+++ b/streampipes-rest-shared/src/main/java/org/apache/streampipes/rest/shared/impl/AbstractSharedRestInterface.java
@@ -17,6 +17,8 @@
  */
 package org.apache.streampipes.rest.shared.impl;
 
+import org.apache.http.HttpStatus;
+
 import jakarta.ws.rs.core.Response;
 
 public abstract class AbstractSharedRestInterface {
@@ -28,19 +30,19 @@ protected <T> Response ok(T entity) {
   }
 
   protected <T> Response badRequest(T entity) {
-    return error(entity, 400);
+    return error(entity, HttpStatus.SC_BAD_REQUEST);
   }
 
   protected <T> Response notFound(T entity) {
-    return error(entity, 404);
+    return error(entity, HttpStatus.SC_NOT_FOUND);
   }
 
   protected <T> Response notFound() {
-    return Response.status(404).build();
+    return Response.status(HttpStatus.SC_NOT_FOUND).build();
   }
 
   protected <T> Response serverError(T entity) {
-    return error(entity, 500);
+    return error(entity, HttpStatus.SC_INTERNAL_SERVER_ERROR);
   }
 
   protected <T> Response error(T entity, Integer statusCode) {
@@ -51,7 +53,7 @@ protected <T> Response error(T entity, Integer statusCode) {
   }
 
   protected Response badRequest() {
-    return Response.status(400).build();
+    return Response.status(HttpStatus.SC_BAD_REQUEST).build();
   }
 
   protected Response ok() {
@@ -59,7 +61,7 @@ protected Response ok() {
   }
 
   protected Response created() {
-    return Response.status(201).build();
+    return Response.status(HttpStatus.SC_CREATED).build();
   }
 
   protected Response fail() {
diff --git a/streampipes-rest/src/main/java/org/apache/streampipes/rest/impl/UserResource.java b/streampipes-rest/src/main/java/org/apache/streampipes/rest/impl/UserResource.java
index 0b577cf7c0..096a01012b 100644
--- a/streampipes-rest/src/main/java/org/apache/streampipes/rest/impl/UserResource.java
+++ b/streampipes-rest/src/main/java/org/apache/streampipes/rest/impl/UserResource.java
@@ -34,6 +34,7 @@
 import org.apache.streampipes.user.management.service.TokenService;
 import org.apache.streampipes.user.management.util.PasswordUtil;
 
+import org.apache.http.HttpStatus;
 import org.springframework.security.access.prepost.PreAuthorize;
 import org.springframework.security.core.context.SecurityContextHolder;
 import org.springframework.stereotype.Component;
@@ -241,7 +242,7 @@ public Response updateUsername(@PathParam("principalId") String principalId,
       }
     }
 
-    return Response.status(401).build();
+    return Response.status(HttpStatus.SC_UNAUTHORIZED).build();
   }
 
   @PUT
diff --git a/streampipes-service-base/src/main/java/org/apache/streampipes/service/base/rest/ServiceHealthResource.java b/streampipes-service-base/src/main/java/org/apache/streampipes/service/base/rest/ServiceHealthResource.java
index 8fec1b1356..0664933767 100644
--- a/streampipes-service-base/src/main/java/org/apache/streampipes/service/base/rest/ServiceHealthResource.java
+++ b/streampipes-service-base/src/main/java/org/apache/streampipes/service/base/rest/ServiceHealthResource.java
@@ -20,11 +20,14 @@
 
 import org.apache.streampipes.service.base.StreamPipesServiceBase;
 
+import org.apache.http.HttpStatus;
+
 import jakarta.ws.rs.GET;
 import jakarta.ws.rs.Path;
 import jakarta.ws.rs.PathParam;
 import jakarta.ws.rs.core.Response;
 
+
 @Path("")
 public class ServiceHealthResource {
 
@@ -34,7 +37,7 @@ public Response healthy(@PathParam("serviceId") String serviceId) {
     if (serviceId.equals(StreamPipesServiceBase.AUTO_GENERATED_SERVICE_ID)) {
       return Response.ok().build();
     } else {
-      return Response.status(404).build();
+      return Response.status(HttpStatus.SC_NOT_FOUND).build();
     }
   }
 }
diff --git a/streampipes-storage-couchdb/src/main/java/org/apache/streampipes/storage/couchdb/utils/CouchDbViewGenerator.java b/streampipes-storage-couchdb/src/main/java/org/apache/streampipes/storage/couchdb/utils/CouchDbViewGenerator.java
index 802cbbef17..29266b6198 100644
--- a/streampipes-storage-couchdb/src/main/java/org/apache/streampipes/storage/couchdb/utils/CouchDbViewGenerator.java
+++ b/streampipes-storage-couchdb/src/main/java/org/apache/streampipes/storage/couchdb/utils/CouchDbViewGenerator.java
@@ -18,6 +18,7 @@
 
 package org.apache.streampipes.storage.couchdb.utils;
 
+import org.apache.http.HttpStatus;
 import org.apache.http.client.fluent.Request;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -44,10 +45,10 @@ public void createGenericDatabaseIfNotExists() {
               .getStatusLine()
               .getStatusCode();
 
-      if (status == 201) {
+      if (status == HttpStatus.SC_CREATED) {
         LOG.info("Database {} successfully created", DB_NAME);
         createViews();
-      } else if (status == 412) {
+      } else if (status == HttpStatus.SC_PRECONDITION_FAILED) {
         LOG.info("Database {} already present", DB_NAME);
       } else {
         LOG.warn("Status code {} from CouchDB - something went wrong during install!", status);
@@ -75,7 +76,7 @@ private void createViews() throws IOException {
         .getStatusLine()
         .getStatusCode();
 
-    if (status == 201) {
+    if (status == HttpStatus.SC_CREATED) {
       LOG.info("View {} successfully created", VIEW_NAME);
     } else {
       LOG.warn("Status code {} from CouchDB - something went wrong during view generation!", status);