diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/DartDioNextClientCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/DartDioNextClientCodegen.java
index 5f438eb6f8b..06322152120 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/DartDioNextClientCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/DartDioNextClientCodegen.java
@@ -430,7 +430,6 @@ public class DartDioNextClientCodegen extends AbstractDartCodegen {
      * @param serializer
      */
     private void addBuiltValueSerializer(BuiltValueSerializer serializer) {
-        System.out.println("######## Add serializer!");
         additionalProperties.compute("builtValueSerializers", (k, v) -> {
             Set<BuiltValueSerializer> serializers = v == null ? Sets.newHashSet() : ((Set<BuiltValueSerializer>) v);
             serializers.add(serializer);
diff --git a/modules/openapi-generator/src/test/java/org/openapitools/codegen/ArchUnitRulesTest.java b/modules/openapi-generator/src/test/java/org/openapitools/codegen/ArchUnitRulesTest.java
index 0a9d7a95abf..fee76d588f6 100644
--- a/modules/openapi-generator/src/test/java/org/openapitools/codegen/ArchUnitRulesTest.java
+++ b/modules/openapi-generator/src/test/java/org/openapitools/codegen/ArchUnitRulesTest.java
@@ -4,6 +4,7 @@ import com.tngtech.archunit.core.domain.JavaClasses;
 import com.tngtech.archunit.core.domain.JavaModifier;
 import com.tngtech.archunit.core.importer.ClassFileImporter;
 import com.tngtech.archunit.lang.ArchRule;
+import com.tngtech.archunit.library.GeneralCodingRules;
 import org.junit.Test;
 import org.slf4j.Logger;
 
@@ -19,6 +20,14 @@ public class ArchUnitRulesTest {
         ArchUnitRulesTest.LOGGERS_SHOULD_BE_NOT_PUBLIC_NOT_STATIC_AND_FINAL.check(importedClasses);
     }
 
+    @Test
+    public void classesNotAllowedToUseStandardStreams() {
+        final JavaClasses importedClasses = new ClassFileImporter()
+                .importPackages("org.openapitools.codegen.languages");
+
+        GeneralCodingRules.NO_CLASSES_SHOULD_ACCESS_STANDARD_STREAMS.check(importedClasses);
+    }
+
     @Test
     public void abstractClassesAreAbstract() {
         final JavaClasses importedClasses = new ClassFileImporter()
diff --git a/modules/openapi-generator/src/test/resources/archunit_ignore_patterns.txt b/modules/openapi-generator/src/test/resources/archunit_ignore_patterns.txt
new file mode 100644
index 00000000000..e6814b46eb6
--- /dev/null
+++ b/modules/openapi-generator/src/test/resources/archunit_ignore_patterns.txt
@@ -0,0 +1,2 @@
+# This rule is for ArchUnitRulesTest.classesNotAllowedToUseStandardStreams to ignore method `postProcess()` of CodegenConfig as it contains funding information
+.*\.postProcess\(\).*