diff --git a/modules/openapi-generator-cli/src/main/java/org/openapitools/codegen/cmd/GenerateBatch.java b/modules/openapi-generator-cli/src/main/java/org/openapitools/codegen/cmd/GenerateBatch.java
index 2c56b2918f94..f2823ce366d8 100644
--- a/modules/openapi-generator-cli/src/main/java/org/openapitools/codegen/cmd/GenerateBatch.java
+++ b/modules/openapi-generator-cli/src/main/java/org/openapitools/codegen/cmd/GenerateBatch.java
@@ -29,6 +29,7 @@ import io.airlift.airline.Arguments;
 import io.airlift.airline.Command;
 import io.airlift.airline.Option;
 import org.apache.commons.io.FileUtils;
+import org.apache.commons.lang3.Strings;
 import org.apache.commons.lang3.StringUtils;
 import org.openapitools.codegen.ClientOptInput;
 import org.openapitools.codegen.CodegenConfig;
@@ -248,7 +249,7 @@ public class GenerateBatch extends OpenApiGeneratorCommand {
             Path filesMeta = Paths.get(outDir.toAbsolutePath().toString(), ".openapi-generator", "FILES");
             if (filesMeta.toFile().exists()) {
                 FileUtils.readLines(filesMeta.toFile(), StandardCharsets.UTF_8).forEach(relativePath -> {
-                    if (!StringUtils.startsWith(relativePath, ".")) {
+                    if (!Strings.CS.startsWith(relativePath, ".")) {
                         Path file = outDir.resolve(relativePath).toAbsolutePath();
                         // hack: disallow directory traversal outside of output directory. we don't want to delete wrong files.
                         if (file.toString().startsWith(outDir.toAbsolutePath().toString())) {
diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractPythonConnexionServerCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractPythonConnexionServerCodegen.java
index c5820f679570..a8eec2f60d0a 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractPythonConnexionServerCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/AbstractPythonConnexionServerCodegen.java
@@ -34,6 +34,7 @@ import io.swagger.v3.oas.models.media.Schema;
 import io.swagger.v3.oas.models.parameters.Parameter;
 import io.swagger.v3.oas.models.parameters.RequestBody;
 import io.swagger.v3.oas.models.security.SecurityScheme;
+import org.apache.commons.lang3.Strings;
 import org.apache.commons.lang3.StringUtils;
 import org.openapitools.codegen.*;
 import org.openapitools.codegen.meta.features.DocumentationFeature;
@@ -601,7 +602,7 @@ public abstract class AbstractPythonConnexionServerCodegen extends AbstractPytho
     @Override
     public String toModelImport(String name) {
         String modelImport;
-        if (StringUtils.startsWithAny(name, "import", "from")) {
+        if (Strings.CS.startsWithAny(name, "import", "from")) {
             modelImport = name;
         } else {
             modelImport = "from ";
diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonClientCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonClientCodegen.java
index 149ce57c317f..a1caa703f4d2 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonClientCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonClientCodegen.java
@@ -20,7 +20,7 @@ package org.openapitools.codegen.languages;
 import io.swagger.v3.oas.models.media.Schema;
 import io.swagger.v3.oas.models.security.SecurityScheme;
 import lombok.Setter;
-import org.apache.commons.lang3.StringUtils;
+import org.apache.commons.lang3.Strings;
 import org.openapitools.codegen.*;
 import org.openapitools.codegen.meta.GeneratorMetadata;
 import org.openapitools.codegen.meta.Stability;
@@ -355,7 +355,7 @@ public class PythonClientCodegen extends AbstractPythonCodegen implements Codege
     @Override
     public String toModelImport(String name) {
         String modelImport;
-        if (StringUtils.startsWithAny(name, "import", "from")) {
+        if (Strings.CS.startsWithAny(name, "import", "from")) {
             modelImport = name;
         } else {
             modelImport = "from ";
diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonFastAPIServerCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonFastAPIServerCodegen.java
index d1e8b2e881be..15e5534b000e 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonFastAPIServerCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonFastAPIServerCodegen.java
@@ -23,6 +23,7 @@ import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.SerializerProvider;
 import com.fasterxml.jackson.databind.module.SimpleModule;
 import io.swagger.v3.oas.models.media.Schema;
+import org.apache.commons.lang3.Strings;
 import org.apache.commons.lang3.StringUtils;
 import org.openapitools.codegen.*;
 import org.openapitools.codegen.meta.GeneratorMetadata;
@@ -203,7 +204,7 @@ public class PythonFastAPIServerCodegen extends AbstractPythonCodegen {
     @Override
     public String toModelImport(String name) {
         String modelImport;
-        if (StringUtils.startsWithAny(name, "import", "from")) {
+        if (Strings.CS.startsWithAny(name, "import", "from")) {
             modelImport = name;
         } else {
             modelImport = "from ";
diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonPydanticV1ClientCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonPydanticV1ClientCodegen.java
index 3c5413e1fee8..0834b51cd4cf 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonPydanticV1ClientCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/PythonPydanticV1ClientCodegen.java
@@ -20,6 +20,7 @@ package org.openapitools.codegen.languages;
 import io.swagger.v3.oas.models.media.Schema;
 import io.swagger.v3.oas.models.security.SecurityScheme;
 import lombok.Setter;
+import org.apache.commons.lang3.Strings;
 import org.apache.commons.lang3.StringUtils;
 import org.openapitools.codegen.*;
 import org.openapitools.codegen.meta.GeneratorMetadata;
@@ -353,7 +354,7 @@ public class PythonPydanticV1ClientCodegen extends AbstractPythonPydanticV1Codeg
     @Override
     public String toModelImport(String name) {
         String modelImport;
-        if (StringUtils.startsWithAny(name, "import", "from")) {
+        if (Strings.CS.startsWithAny(name, "import", "from")) {
             modelImport = name;
         } else {
             modelImport = "from ";
diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RustServerCodegen.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RustServerCodegen.java
index 54112fcc5e1d..7231c50e7623 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RustServerCodegen.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RustServerCodegen.java
@@ -1408,6 +1408,7 @@ public class RustServerCodegen extends AbstractRustCodegen implements CodegenCon
      *
      * @deprecated Avoid using this - use a different mechanism instead.
      */
+    @Deprecated
     private static String stripNullable(String type) {
         if (type.startsWith("swagger::Nullable<") && type.endsWith(">")) {
             return type.substring("swagger::Nullable<".length(), type.length() - 1);
diff --git a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RustServerCodegenDeprecated.java b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RustServerCodegenDeprecated.java
index 7297b8b4de41..5d17b2416506 100644
--- a/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RustServerCodegenDeprecated.java
+++ b/modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/RustServerCodegenDeprecated.java
@@ -1408,6 +1408,7 @@ public class RustServerCodegenDeprecated extends AbstractRustCodegen implements
      *
      * @deprecated Avoid using this - use a different mechanism instead.
      */
+    @Deprecated
     private static String stripNullable(String type) {
         if (type.startsWith("swagger::Nullable<") && type.endsWith(">")) {
             return type.substring("swagger::Nullable<".length(), type.length() - 1);