misc: add linter

aws-lambda-java-runtime-interface-client/build-tools/checkstyle.xml

@@ -0,0 +1,115 @@
+<?xml version="1.0"?>
+<!DOCTYPE module PUBLIC
+"-//Puppy Crawl//DTD Check Configuration 1.2//EN"
+"http://www.puppycrawl.com/dtds/configuration_1_2.dtd">
+
+<module name="Checker">
+  <module name="NewlineAtEndOfFile" />
+  <module name="OrderedProperties" />
+  <module name="FileTabCharacter" />
+  <module name="Header">
+    <property name="header"
+      value="/*\nCopyright Amazon.com, Inc. or its affiliates. All Rights Reserved.\nSPDX-License-Identifier: Apache-2.0\n*/\n"/>
+  </module>
+  <module name="FileTabCharacter"/>
+  <module name="TreeWalker">
+    <module name="UnusedImports"/>
+    <module name="NeedBraces"/>
+    <module name="EqualsHashCode"/>
+    <module name="EmptyStatement"/>
+    <module name="EqualsAvoidNull"/>
+    <module name="MissingSwitchDefault"/>
+    <module name="MultipleVariableDeclarations"/>
+    <module name="OneStatementPerLine"/>
+    <module name="RedundantImport"/>
+    <module name="AvoidStarImport"/>
+    <module name="DefaultComesLast"/>
+    <module name="SuppressWarningsHolder" />
+    <module name="EmptyForInitializerPad" />
+    <module name="GenericWhitespace" />
+    <module name="MethodParamPad" />
+    <module name="NoLineWrap" />
+    <module name="NoWhitespaceAfter" />
+    <module name="NoWhitespaceBefore" />
+    <module name="NoWhitespaceBeforeCaseDefaultColon" />
+    <module name="OperatorWrap" />
+    <module name="ParenPad" />
+    <module name="SeparatorWrap" />
+    <module name="SingleSpaceSeparator" />
+    <module name="TypecastParenPad" />
+    <module name="WhitespaceAfter" />
+    <module name="WhitespaceAround" />
+    <module name="AvoidNestedBlocks" />
+    <module name="EmptyBlock" />
+    <module name="EmptyCatchBlock" />
+    <module name="LeftCurly" />
+    <module name="NeedBraces" />
+    <module name="RightCurly" />
+    <module name="InnerTypeLast" />
+    <module name="MutableException" />
+    <module name="OneTopLevelClass" />
+    <module name="ThrowsCount" />
+
+    <module name="AvoidNoArgumentSuperConstructorCall" />
+    <module name="CovariantEquals" />
+    <module name="DeclarationOrder" />
+    <module name="DefaultComesLast" />
+    <module name="EmptyStatement" />
+    <module name="EqualsAvoidNull" />
+    <module name="EqualsHashCode" />
+    <module name="FallThrough" />
+    <module name="IllegalInstantiation" />
+    <module name="IllegalToken" />
+    <module name="IllegalTokenText" />
+    <module name="IllegalType" />
+    <module name="InnerAssignment" />
+    <module name="MatchXpath" />
+    <module name="MissingSwitchDefault" />
+    <module name="ModifiedControlVariable" />
+    <module name="MultipleVariableDeclarations" />
+    <module name="NestedForDepth" />
+    <module name="NestedTryDepth" />
+    <module name="NoArrayTrailingComma" />
+    <module name="NoClone" />
+    <module name="NoEnumTrailingComma" />
+    <module name="NoFinalizer" />
+    <module name="OneStatementPerLine" />
+    <module name="OverloadMethodsDeclarationOrder" />
+    <module name="PackageDeclaration" />
+    <module name="ParameterAssignment" />
+    <module name="RequireThis" />
+    <module name="SimplifyBooleanExpression" />
+    <module name="SimplifyBooleanReturn" />
+    <module name="StringLiteralEquality" />
+    <module name="SuperClone" />
+    <module name="SuperFinalize" />
+    <module name="UnnecessarySemicolonAfterOuterTypeDeclaration" />
+    <module name="UnnecessarySemicolonAfterTypeMemberDeclaration" />
+    <module name="UnnecessarySemicolonInEnumeration" />
+    <module name="UnnecessarySemicolonInTryWithResources" />
+    <module name="VariableDeclarationUsageDistance" />
+
+    <module name="ImportOrder" />
+    <module name="RedundantImport" />
+    <module name="UnusedImports" />
+
+    <module name="ArrayTypeStyle" />
+    <module name="AvoidEscapedUnicodeCharacters" />
+    <module name="CommentsIndentation" />
+    <module name="DescendantToken" />
+    <module name="Indentation" />
+    <module name="NoCodeInFile" />
+    <module name="OuterTypeFilename" />
+    <module name="TodoComment" />
+    <module name="TrailingComment" />
+    <module name="UpperEll" />
+
+    <module name="LambdaBodyLength" />
+    <module name="MethodCount" />
+    <module name="MethodLength" />
+    <module name="OuterTypeNumber" />
+    <module name="RecordComponentNumber" />
+  </module>
+
+  <module name="SuppressWarningsFilter" />
+</module>

aws-lambda-java-runtime-interface-client/pom.xml

@@ -38,6 +38,7 @@
         <maven-install-plugin.version>2.4</maven-install-plugin.version>
         <maven-deploy-plugin.version>3.1.1</maven-deploy-plugin.version>
         <junit-jupiter.version>5.9.2</junit-jupiter.version>
+        <maven-checkstyle-plugin.version>3.4.0</maven-checkstyle-plugin.version>
         <!--
             The test/integration/codebuild/buildspec.*.yml files will set -DmultiArch=false
             as a workaround for executing within Github Actions. At time of writing (2022-04-08) the
@@ -238,6 +239,26 @@
                     </execution>
                 </executions>
             </plugin>
+              <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-checkstyle-plugin</artifactId>
+                <version>${maven-checkstyle-plugin.version}</version>
+                <configuration>
+                    <configLocation>build-tools/checkstyle.xml</configLocation>
+                    <failOnViolation>true</failOnViolation>
+                    <consoleOutput>true</consoleOutput>
+                    <logViolationsToConsole>true</logViolationsToConsole>
+                </configuration>
+                <executions>
+                    <execution>
+                        <id>validate</id>
+                        <phase>validate</phase>
+                        <goals>
+                            <goal>check</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
         </plugins>
     </build>
 

aws-lambda-java-runtime-interface-client/src/main/java/com/amazonaws/services/lambda/crac/CheckpointException.java

@@ -1,12 +1,12 @@
 /*
- *  Copyright 2023 Amazon.com, Inc. or its affiliates. All Rights Reserved.
- */
+Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+SPDX-License-Identifier: Apache-2.0
+*/
 
 package com.amazonaws.services.lambda.crac;
 
 public class CheckpointException extends Exception {
     private static final long serialVersionUID = -4956873658083157585L;
     public CheckpointException() {
-        super();
     }
 }

aws-lambda-java-runtime-interface-client/src/main/java/com/amazonaws/services/lambda/crac/Context.java

@@ -1,6 +1,7 @@
 /*
- *  Copyright 2023 Amazon.com, Inc. or its affiliates. All Rights Reserved.
- */
+Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+SPDX-License-Identifier: Apache-2.0
+*/
 
 package com.amazonaws.services.lambda.crac;
 

aws-lambda-java-runtime-interface-client/src/main/java/com/amazonaws/services/lambda/crac/ContextImpl.java

@@ -1,6 +1,7 @@
 /*
- *  Copyright 2023 Amazon.com, Inc. or its affiliates. All Rights Reserved.
- */
+Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+SPDX-License-Identifier: Apache-2.0
+*/
 
 package com.amazonaws.services.lambda.crac;
 
@@ -57,19 +58,19 @@ public synchronized void register(Resource resource) {
     }
 
     private List<Resource> getCheckpointQueueReverseOrderOfRegistration() {
-        return checkpointQueue.entrySet()
-                .stream()
-                .sorted((r1, r2) -> (int) (r2.getValue() - r1.getValue()))
-                .map(Map.Entry::getKey)
-                .collect(Collectors.toList());
+        return checkpointQueue.entrySet().
+            stream().
+            sorted((r1, r2) -> (int) (r2.getValue() - r1.getValue())).
+            map(Map.Entry::getKey).
+            collect(Collectors.toList());
     }
 
     private List<Resource> getCheckpointQueueForwardOrderOfRegistration() {
-        return checkpointQueue.entrySet()
-                .stream()
-                .sorted((r1, r2) -> (int) (r1.getValue() - r2.getValue()))
-                .map(Map.Entry::getKey)
-                .collect(Collectors.toList());
+        return checkpointQueue.entrySet().
+            stream().
+            sorted((r1, r2) -> (int) (r1.getValue() - r2.getValue())).
+            map(Map.Entry::getKey).
+            collect(Collectors.toList());
     }
 
     private void executeBeforeCheckpointHooks() throws CheckpointException {

aws-lambda-java-runtime-interface-client/src/main/java/com/amazonaws/services/lambda/crac/Core.java

@@ -1,6 +1,7 @@
 /*
- *  Copyright 2023 Amazon.com, Inc. or its affiliates. All Rights Reserved.
- */
+Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+SPDX-License-Identifier: Apache-2.0
+*/
 
 package com.amazonaws.services.lambda.crac;
 
@@ -9,11 +10,11 @@
  */
 public final class Core {
 
+    private static Context<Resource> globalContext = new ContextImpl();
+
     private Core() {
     }
 
-    private static Context<Resource> globalContext = new ContextImpl();
-
     public static Context<Resource> getGlobalContext() {
         return globalContext;
     }

aws-lambda-java-runtime-interface-client/src/main/java/com/amazonaws/services/lambda/crac/DNSManager.java

@@ -7,4 +7,4 @@
 
 class DNSManager {
     static native void clearCache();
-}
+}

aws-lambda-java-runtime-interface-client/src/main/java/com/amazonaws/services/lambda/crac/Resource.java

@@ -1,6 +1,7 @@
 /*
- *  Copyright 2023 Amazon.com, Inc. or its affiliates. All Rights Reserved.
- */
+Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+SPDX-License-Identifier: Apache-2.0
+*/
 
 package com.amazonaws.services.lambda.crac;
 

aws-lambda-java-runtime-interface-client/src/main/java/com/amazonaws/services/lambda/crac/RestoreException.java

@@ -1,13 +1,13 @@
 /*
- *  Copyright 2023 Amazon.com, Inc. or its affiliates. All Rights Reserved.
- */
+Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+SPDX-License-Identifier: Apache-2.0
+*/
 
 package com.amazonaws.services.lambda.crac;
 
 public class RestoreException extends Exception {
     private static final long serialVersionUID = -823900409868237860L;
 
     public RestoreException() {
-        super();
     }
 }

aws-lambda-java-runtime-interface-client/src/main/java/com/amazonaws/services/lambda/runtime/api/client/AWSLambda.java

@@ -23,7 +23,6 @@
 import com.amazonaws.services.lambda.runtime.logging.LogFormat;
 import com.amazonaws.services.lambda.runtime.logging.LogLevel;
 import com.amazonaws.services.lambda.runtime.serialization.util.ReflectUtil;
-
 import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.FileDescriptor;
@@ -50,6 +49,8 @@
  */
 public class AWSLambda {
 
+    protected static URLClassLoader customerClassLoader;
+
     private static final String TRUST_STORE_PROPERTY = "javax.net.ssl.trustStore";
 
     private static final String JAVA_SECURITY_PROPERTIES = "java.security.properties";
@@ -68,8 +69,6 @@ public class AWSLambda {
 
     private static final String AWS_LAMBDA_INITIALIZATION_TYPE = System.getenv(ReservedRuntimeEnvironmentVariables.AWS_LAMBDA_INITIALIZATION_TYPE);
 
-    protected static URLClassLoader customerClassLoader;
-
     private static LambdaRuntimeApiClient runtimeClient;
 
     static {
@@ -238,7 +237,8 @@ private static void startRuntime(String handler, LambdaContextLogger lambdaLogge
             try {
                 payload = requestHandler.call(request);
                 runtimeClient.reportInvocationSuccess(request.getId(), payload.toByteArray());
-                boolean ignored = Thread.interrupted(); // clear interrupted flag in case if it was set by user's code
+                // clear interrupted flag in case if it was set by user's code
+                boolean ignored = Thread.interrupted();
             } catch (UserFault f) {
                 shouldExit = f.fatal;
                 userFault = f;

aws-lambda-java-runtime-interface-client/src/main/java/com/amazonaws/services/lambda/runtime/api/client/ClasspathLoader.java

@@ -1,4 +1,7 @@
-/* Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved. */
+/*
+Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+SPDX-License-Identifier: Apache-2.0
+*/
 
 package com.amazonaws.services.lambda.runtime.api.client;
 

aws-lambda-java-runtime-interface-client/src/main/java/com/amazonaws/services/lambda/runtime/api/client/CustomerClassLoader.java

@@ -1,4 +1,7 @@
-/* Copyright 2019 Amazon.com, Inc. or its affiliates. All Rights Reserved. */
+/*
+Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+SPDX-License-Identifier: Apache-2.0
+*/
 
 package com.amazonaws.services.lambda.runtime.api.client;
 
@@ -24,7 +27,8 @@ class CustomerClassLoader extends URLClassLoader {
         @Override
         public boolean accept(File dir, String name) {
             int offset = name.length() - 4;
-            if (offset <= 0) { /* must be at least A.jar */
+            // must be at least A.jar
+            if (offset <= 0) {
                 return false;
             } else {
                 return name.startsWith(".jar", offset);