Add a spotless formatter to shorten uncessary FQNs

aws/aws-service-bundler/src/main/java/software/amazon/smithy/java/aws/servicebundle/bundler/AwsServiceBundler.java

@@ -186,7 +186,7 @@ public SmithyBundle bundle() {
         }
     }
 
-    private static String serializeModel(software.amazon.smithy.model.Model model) {
+    private static String serializeModel(Model model) {
         return ObjectNode.printJson(ModelSerializer.builder()
                 .build()
                 .serialize(model));

aws/client/aws-client-restxml/src/it/java/software/amazon/smithy/java/aws/client/restxml/RestXmlProtocolTests.java

@@ -20,6 +20,7 @@
 import org.w3c.dom.NamedNodeMap;
 import org.w3c.dom.Node;
 import org.w3c.dom.NodeList;
+import org.xml.sax.InputSource;
 import software.amazon.smithy.java.io.ByteBufferUtils;
 import software.amazon.smithy.java.io.datastream.DataStream;
 import software.amazon.smithy.java.protocoltests.harness.HttpClientRequestTests;
@@ -80,7 +81,7 @@ private static Document parseXML(String xml) throws Exception {
             dbf.setIgnoringElementContentWhitespace(true);
 
             DocumentBuilder db = dbf.newDocumentBuilder();
-            return db.parse(new org.xml.sax.InputSource(new StringReader(xml)));
+            return db.parse(new InputSource(new StringReader(xml)));
         }
 
         private static void removeWhitespaceNodes(Node node) {

aws/server/aws-server-restjson/src/main/java/software/amazon/smithy/java/aws/server/restjson/router/BasicPathRouteMatcher.java

@@ -8,6 +8,7 @@
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Objects;
+import java.util.regex.Matcher;
 import java.util.regex.Pattern;
 import software.amazon.smithy.java.aws.server.restjson.router.PathPattern.Segment;
 
@@ -40,7 +41,7 @@ public int getRank() {
 
     @Override
     public Match match(String path) {
-        java.util.regex.Matcher m = pattern.matcher(path);
+        Matcher m = pattern.matcher(path);
 
         if (!m.matches()) {
             return null;

benchmarks/serde-benchmarks/src/jmh/java/software/amazon/smithy/java/benchmarks/serde/JmhResultConverter.java

@@ -5,6 +5,7 @@
 
 package software.amazon.smithy.java.benchmarks.serde;
 
+import com.sun.management.OperatingSystemMXBean;
 import java.io.IOException;
 import java.io.PrintWriter;
 import java.lang.management.ManagementFactory;
@@ -289,7 +290,7 @@ private static String detectMachineInfo() {
 
         // Fall back to cores + RAM summary
         int cores = Runtime.getRuntime().availableProcessors();
-        long ramMb = ManagementFactory.getOperatingSystemMXBean() instanceof com.sun.management.OperatingSystemMXBean os
+        long ramMb = ManagementFactory.getOperatingSystemMXBean() instanceof OperatingSystemMXBean os
                 ? os.getTotalMemorySize() / (1024 * 1024)
                 : Runtime.getRuntime().maxMemory() / (1024 * 1024);
         String ramLabel = ramMb >= 1024 ? (ramMb / 1024) + "GB" : ramMb + "MB";

buildSrc/build.gradle.kts

@@ -1,5 +1,6 @@
 plugins {
     `kotlin-dsl`
+    `java-library`
 }
 
 repositories {
@@ -17,4 +18,15 @@ dependencies {
 
     // https://github.com/gradle/gradle/issues/15383
     implementation(files(libs.javaClass.superclass.protectionDomain.codeSource.location))
+
+    testImplementation("org.junit.jupiter:junit-jupiter:5.11.4")
+    testRuntimeOnly("org.junit.platform:junit-platform-launcher:1.11.4")
+}
+
+tasks.test {
+    useJUnitPlatform()
+}
+
+tasks.withType<JavaCompile>().configureEach {
+    options.release.set(21)
 }