diff --git a/modules/swagger-codegen-maven-plugin/src/main/java/io/swagger/codegen/plugin/CodeGenMojo.java b/modules/swagger-codegen-maven-plugin/src/main/java/io/swagger/codegen/plugin/CodeGenMojo.java
index 79a100bba21..37c68adf0f3 100644
--- a/modules/swagger-codegen-maven-plugin/src/main/java/io/swagger/codegen/plugin/CodeGenMojo.java
+++ b/modules/swagger-codegen-maven-plugin/src/main/java/io/swagger/codegen/plugin/CodeGenMojo.java
@@ -163,8 +163,6 @@ public class CodeGenMojo extends AbstractMojo {
     @Override
     public void execute() throws MojoExecutionException {
 
-        Swagger swagger = new SwaggerParser().read(inputSpec);
-
         //attempt to read from config file
         CodegenConfigurator configurator = CodegenConfigurator.fromFile(configurationFile);
 
@@ -258,7 +256,7 @@ public void execute() throws MojoExecutionException {
                 configurator.addSystemProperty(key, value);
             }
         }
-        
+
         final ClientOptInput input = configurator.toClientOptInput();
         final CodegenConfig config = input.getConfig();
 
@@ -285,7 +283,7 @@ public void execute() throws MojoExecutionException {
             // Maven logs exceptions thrown by plugins only if invoked with -e
             // I find it annoying to jump through hoops to get basic diagnostic information,
             // so let's log it in any case:
-            getLog().error(e); 
+            getLog().error(e);
             throw new MojoExecutionException("Code generation failed. See above for the full exception.");
         }
 
diff --git a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/HaskellServantCodegen.java b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/HaskellServantCodegen.java
index 324ca56e70b..13deaa8d83a 100644
--- a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/HaskellServantCodegen.java
+++ b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/HaskellServantCodegen.java
@@ -7,7 +7,6 @@
 import io.swagger.models.Model;
 import io.swagger.models.Operation;
 import io.swagger.models.Swagger;
-import sun.reflect.generics.reflectiveObjects.NotImplementedException;
 
 import java.util.*;
 import java.io.File;
@@ -154,12 +153,12 @@ public HaskellServantCodegen() {
      * @return the escaped term
      */
     @Override
-    public String escapeReservedWord(String name) {
+    public String escapeReservedWord(final String name) {
         return name + "_";
     }
 
     @Override
-    public void preprocessSwagger(Swagger swagger) {
+    public void preprocessSwagger(final Swagger swagger) {
         // From the title, compute a reasonable name for the package and the API
         String title = swagger.getInfo().getTitle();
 
@@ -225,7 +224,7 @@ public void preprocessSwagger(Swagger swagger) {
      * @return a string value used as the `dataType` field for model templates, `returnType` for api templates
      */
     @Override
-    public String getTypeDeclaration(Property p) {
+    public String getTypeDeclaration(final Property p) {
         if (p instanceof ArrayProperty) {
             ArrayProperty ap = (ArrayProperty) p;
             Property inner = ap.getItems();
@@ -246,7 +245,7 @@ public String getTypeDeclaration(Property p) {
      * @see io.swagger.models.properties.Property
      */
     @Override
-    public String getSwaggerType(Property p) {
+    public String getSwaggerType(final Property p) {
         String swaggerType = super.getSwaggerType(p);
         String type = null;
         if (typeMapping.containsKey(swaggerType)) {
@@ -264,7 +263,7 @@ public String getSwaggerType(Property p) {
     }
 
     @Override
-    public String toInstantiationType(Property p) {
+    public String toInstantiationType(final Property p) {
         if (p instanceof MapProperty) {
             MapProperty ap = (MapProperty) p;
             Property additionalProperties2 = ap.getAdditionalProperties();
@@ -288,7 +287,7 @@ public String toInstantiationType(Property p) {
 
 
     // Intersperse a separator string between a list of strings, like String.join.
-    private String joinStrings(String sep, List<String> ss) {
+    private String joinStrings(final String sep, final List<String> ss) {
         StringBuilder sb = new StringBuilder();
         for (String s : ss) {
             if (sb.length() > 0) {
@@ -303,7 +302,7 @@ private String joinStrings(String sep, List<String> ss) {
     // For example, the path /api/jobs/info/{id}/last would become:
     //      "api" :> "jobs" :> "info" :> Capture "id" IdType :> "last"
     // IdType is provided by the capture params.
-    private List<String> pathToServantRoute(String path, List<CodegenParameter> pathParams) {
+    private List<String> pathToServantRoute(String path, final List<CodegenParameter> pathParams) {
         // Map the capture params by their names.
         HashMap<String, String> captureTypes = new HashMap<String, String>();
         for (CodegenParameter param : pathParams) {
@@ -331,7 +330,7 @@ private List<String> pathToServantRoute(String path, List<CodegenParameter> path
     }
 
     // Extract the arguments that are passed in the route path parameters
-    private List<String> pathToClientType(String path, List<CodegenParameter> pathParams) {
+    private List<String> pathToClientType(String path, final List<CodegenParameter> pathParams) {
         // Map the capture params by their names.
         HashMap<String, String> captureTypes = new HashMap<String, String>();
         for (CodegenParameter param : pathParams) {
@@ -357,7 +356,7 @@ private List<String> pathToClientType(String path, List<CodegenParameter> pathPa
 
 
     @Override
-    public CodegenOperation fromOperation(String resourcePath, String httpMethod, Operation operation, Map<String, Model> definitions, Swagger swagger) {
+    public CodegenOperation fromOperation(final String resourcePath, final String httpMethod, final Operation operation, final Map<String, Model> definitions, final Swagger swagger) {
         CodegenOperation op = super.fromOperation(resourcePath, httpMethod, operation, definitions, swagger);
 
         List<String> path = pathToServantRoute(op.path, op.pathParams);
@@ -423,7 +422,7 @@ public CodegenOperation fromOperation(String resourcePath, String httpMethod, Op
         return op;
     }
 
-    private String makeQueryListType(String type, String collectionFormat) {
+    private String makeQueryListType(String type, final String collectionFormat) {
         type = type.substring(1, type.length() - 1);
         switch(collectionFormat) {
             case "csv": return "(QueryList 'CommaSeparated (" + type + "))";
@@ -432,11 +431,11 @@ private String makeQueryListType(String type, String collectionFormat) {
             case "pipes": return "(QueryList 'PipeSeparated (" + type + "))";
             case "multi": return "(QueryList 'MultiParamArray (" + type + "))";
             default:
-                throw new NotImplementedException();
+                throw new UnsupportedOperationException();
         }
     }
 
-    private String fixOperatorChars(String string) {
+    private String fixOperatorChars(final String string) {
         StringBuilder sb = new StringBuilder();
         for (char c : string.toCharArray()) {
             if (specialCharReplacements.containsKey(c)) {
@@ -450,13 +449,13 @@ private String fixOperatorChars(String string) {
     }
 
     // Remove characters from a string that do not belong in a model classname
-    private String fixModelChars(String string) {
+    private String fixModelChars(final String string) {
         return string.replace(".", "").replace("-", "");
     }
 
     // Override fromModel to create the appropriate model namings
     @Override
-    public CodegenModel fromModel(String name, Model mod, Map<String, Model> allDefinitions) {
+    public CodegenModel fromModel(final String name, final Model mod, final Map<String, Model> allDefinitions) {
         CodegenModel model = super.fromModel(name, mod, allDefinitions);
 
         // Clean up the class name to remove invalid characters
@@ -487,7 +486,7 @@ public CodegenModel fromModel(String name, Model mod, Map<String, Model> allDefi
     }
 
     @Override
-    public CodegenParameter fromParameter(Parameter param, Set<String> imports) {
+    public CodegenParameter fromParameter(final Parameter param, final Set<String> imports) {
         CodegenParameter p = super.fromParameter(param, imports);
         p.vendorExtensions.put("x-formParamName", camelize(p.baseName));
         p.dataType = fixModelChars(p.dataType);
diff --git a/modules/swagger-codegen/src/test/java/io/swagger/codegen/go/GoClientOptionsTest.java b/modules/swagger-codegen/src/test/java/io/swagger/codegen/go/GoClientOptionsTest.java
index 528666c58e5..5baf4f9eb1c 100644
--- a/modules/swagger-codegen/src/test/java/io/swagger/codegen/go/GoClientOptionsTest.java
+++ b/modules/swagger-codegen/src/test/java/io/swagger/codegen/go/GoClientOptionsTest.java
@@ -1,4 +1,4 @@
-package io.swagger.codegen.Go;
+package io.swagger.codegen.go;
 
 import io.swagger.codegen.AbstractOptionsTest;
 import io.swagger.codegen.CodegenConfig;
@@ -29,7 +29,7 @@ protected void setExpectations() {
             clientCodegen.setPackageVersion(GoClientOptionsProvider.PACKAGE_VERSION_VALUE);
             times = 1;
             clientCodegen.setPackageName(GoClientOptionsProvider.PACKAGE_NAME_VALUE);
-            times = 1;                        
+            times = 1;
         }};
     }
 }
diff --git a/modules/swagger-codegen/src/test/java/io/swagger/codegen/go/GoModelTest.java b/modules/swagger-codegen/src/test/java/io/swagger/codegen/go/GoModelTest.java
index 83fa8d6437e..84df354e6d8 100644
--- a/modules/swagger-codegen/src/test/java/io/swagger/codegen/go/GoModelTest.java
+++ b/modules/swagger-codegen/src/test/java/io/swagger/codegen/go/GoModelTest.java
@@ -1,4 +1,4 @@
-package io.swagger.codegen.Go;
+package io.swagger.codegen.go;
 
 import io.swagger.codegen.CodegenModel;
 import io.swagger.codegen.CodegenProperty;
@@ -257,7 +257,7 @@ public static Object[][] primeNumbers() {
     }
 
     @Test(dataProvider = "modelNames", description = "avoid inner class")
-    public void modelNameTest(String name, String expectedName) {
+    public void modelNameTest(final String name, final String expectedName) {
         final Model model = new ModelImpl();
         final DefaultCodegen codegen = new GoClientCodegen();
         final CodegenModel cm = codegen.fromModel(name, model);
diff --git a/modules/swagger-codegen/src/test/java/io/swagger/codegen/lumen/LumenServerOptionsTest.java b/modules/swagger-codegen/src/test/java/io/swagger/codegen/lumen/LumenServerOptionsTest.java
index 71d9b3942f1..dcb89d263cc 100644
--- a/modules/swagger-codegen/src/test/java/io/swagger/codegen/lumen/LumenServerOptionsTest.java
+++ b/modules/swagger-codegen/src/test/java/io/swagger/codegen/lumen/LumenServerOptionsTest.java
@@ -1,4 +1,4 @@
-package io.swagger.codegen.slim;
+package io.swagger.codegen.lumen;
 
 import io.swagger.codegen.AbstractOptionsTest;
 import io.swagger.codegen.CodegenConfig;
diff --git a/modules/swagger-codegen/src/test/java/io/swagger/codegen/springboot/SpringBootServerOptionsTest.java b/modules/swagger-codegen/src/test/java/io/swagger/codegen/springboot/SpringBootServerOptionsTest.java
index a7ecdd9d974..7228f119711 100644
--- a/modules/swagger-codegen/src/test/java/io/swagger/codegen/springboot/SpringBootServerOptionsTest.java
+++ b/modules/swagger-codegen/src/test/java/io/swagger/codegen/springboot/SpringBootServerOptionsTest.java
@@ -1,4 +1,4 @@
-package io.swagger.codegen.springBoot;
+package io.swagger.codegen.springboot;
 
 import io.swagger.codegen.CodegenConfig;
 import io.swagger.codegen.java.JavaClientOptionsTest;
@@ -54,7 +54,7 @@ protected void setExpectations() {
             times = 1;
             clientCodegen.setBasePackage(SpringBootServerOptionsProvider.BASE_PACKAGE_VALUE);
             times = 1;
- 
+
         }};
     }
 }