Make Java classes final if possible

Also add private no-arg constructors for classes that aren't meant to be instantiated.

pkl-core/src/main/java/org/pkl/core/BufferedLogger.java

@@ -16,7 +16,7 @@
 package org.pkl.core;
 
 /** A logger that keeps messages locally and can return them. */
-public class BufferedLogger implements Logger {
+public final class BufferedLogger implements Logger {
 
   private final StringBuilder builder = new StringBuilder();
   private final Logger logger;

pkl-core/src/main/java/org/pkl/core/Loggers.java

@@ -21,6 +21,8 @@ import java.io.PrintWriter;
 /** Predefined {@link Logger}s. */
 @SuppressWarnings("unused")
 public final class Loggers {
+  private Loggers() {}
+
   /** Returns a logger that discards log messages. */
   public static Logger noop() {
     return new Logger() {

pkl-core/src/main/java/org/pkl/core/ModuleSource.java

@@ -27,7 +27,7 @@ import org.pkl.core.util.Nullable;
  * <p>Create a new module source via {@link #create(URI, String)}, or one of the various helper
  * factory methods.
  */
-public class ModuleSource {
+public final class ModuleSource {
   public static ModuleSource create(URI uri, @Nullable String text) {
     return new ModuleSource(uri, text);
   }

pkl-core/src/main/java/org/pkl/core/Release.java

@@ -27,7 +27,7 @@ import java.util.Set;
  * Information about the Pkl release that the current program runs on. This class is the Java
  * equivalent of standard library module {@code pkl.release}.
  */
-public class Release {
+public final class Release {
   private static final String SOURCE_CODE_HOMEPAGE = "https://github.com/apple/pkl/";
   private static final String DOCUMENTATION_HOMEPAGE = "https://pkl-lang.org/main/";
 

pkl-core/src/main/java/org/pkl/core/RendererException.java

@@ -15,7 +15,7 @@
  */
 package org.pkl.core;
 
-public class RendererException extends RuntimeException {
+public final class RendererException extends RuntimeException {
   public RendererException(String message) {
     super(message);
   }

pkl-core/src/main/java/org/pkl/core/SecurityManagerException.java

@@ -20,7 +20,7 @@ package org.pkl.core;
  *
  * <p>{@link SecurityManagerException#getMessage()} is passed to users when errors arise.
  */
-public class SecurityManagerException extends Exception {
+public final class SecurityManagerException extends Exception {
   public SecurityManagerException(String message) {
     super(message);
   }

pkl-core/src/main/java/org/pkl/core/ast/VmModifier.java

@@ -22,6 +22,8 @@ import org.pkl.core.runtime.VmExceptionBuilder;
 import org.pkl.core.runtime.VmSet;
 
 public final class VmModifier {
+  private VmModifier() {}
+
   // user-facing modifiers
 
   public static final int ABSTRACT = 0x1;

pkl-core/src/main/java/org/pkl/core/ast/builder/ImportsAndReadsParser.java

@@ -46,7 +46,7 @@ import org.pkl.core.util.Pair;
  *   <li>read expressions
  * </ul>
  */
-public class ImportsAndReadsParser
+public final class ImportsAndReadsParser
     extends AbstractAstBuilder<@Nullable List<Pair<String, SourceSection>>> {
 
   /** Parses a module, and collects all imports and reads. */
@@ -69,7 +69,7 @@ public class ImportsAndReadsParser
   }
 
   @Override
-  public @Nullable List<Pair<String, SourceSection>> visitModuleExtendsOrAmendsClause(
+  public List<Pair<String, SourceSection>> visitModuleExtendsOrAmendsClause(
       ModuleExtendsOrAmendsClauseContext ctx) {
     var importStr = doVisitSingleLineConstantStringPart(ctx.stringConstant().ts);
     var sourceSection = createSourceSection(ctx.stringConstant());

pkl-core/src/main/java/org/pkl/core/http/HttpClientInitException.java

@@ -19,7 +19,7 @@ package org.pkl.core.http;
  * Indicates that an error occurred while initializing an HTTP client. A common example is an error
  * reading or parsing a certificate.
  */
-public class HttpClientInitException extends RuntimeException {
+public final class HttpClientInitException extends RuntimeException {
   public HttpClientInitException(String message) {
     super(message);
   }

pkl-core/src/main/java/org/pkl/core/http/LazyHttpClient.java

@@ -29,7 +29,7 @@ import javax.annotation.concurrent.ThreadSafe;
  * send.
  */
 @ThreadSafe
-class LazyHttpClient implements HttpClient {
+final class LazyHttpClient implements HttpClient {
   private final Supplier<HttpClient> supplier;
   private final Object lock = new Object();
 

pkl-core/src/main/java/org/pkl/core/module/FileResolver.java

@@ -25,7 +25,7 @@ import java.util.ArrayList;
 import java.util.Collections;
 import java.util.List;
 
-public class FileResolver {
+public final class FileResolver {
   private FileResolver() {}
 
   public static List<PathElement> listElements(URI baseUri) throws IOException {

pkl-core/src/main/java/org/pkl/core/module/ModulePathResolver.java

@@ -38,7 +38,7 @@ import org.pkl.core.util.LateInit;
  * <p>NOTE: Do not initialize two resolvers for the same jar or zip file. Instead, share the same
  * resolver for that jar or zip file.
  */
-public class ModulePathResolver implements AutoCloseable {
+public final class ModulePathResolver implements AutoCloseable {
   private final Iterable<Path> modulePath;
 
   private final Object lock = new Object();

pkl-core/src/main/java/org/pkl/core/module/PathElement.java

@@ -80,7 +80,7 @@ public class PathElement {
     return "PathElement{" + "name='" + name + '\'' + ", isDirectory=" + isDirectory + '}';
   }
 
-  public static class TreePathElement extends PathElement {
+  public static final class TreePathElement extends PathElement {
     private final EconomicMap<String, TreePathElement> children = EconomicMaps.create();
 
     public TreePathElement(String name, boolean isDirectory) {

pkl-core/src/main/java/org/pkl/core/module/ProjectDependenciesManager.java

@@ -35,7 +35,7 @@ import org.pkl.core.runtime.VmExceptionBuilder;
 import org.pkl.core.util.EconomicMaps;
 import org.pkl.core.util.json.Json.JsonParseException;
 
-public class ProjectDependenciesManager {
+public final class ProjectDependenciesManager {
   public static final String PKL_PROJECT_FILENAME = "PklProject";
 
   public static final String PKL_PROJECT_DEPS_FILENAME = "PklProject.deps.json";

pkl-core/src/main/java/org/pkl/core/packages/DependencyMetadata.java

@@ -70,7 +70,7 @@ import org.pkl.core.util.json.JsonWriter;
  */
 @SuppressWarnings({"JavadocLinkAsPlainText", "unused"})
 // incorrectly thinks link within sample metadata is a JavaDoc link
-public class DependencyMetadata {
+public final class DependencyMetadata {
 
   public static DependencyMetadata parse(String input) throws JsonParseException {
     var parsed = Json.parseObject(input);

pkl-core/src/main/java/org/pkl/core/packages/PackageAssetUri.java

@@ -25,7 +25,7 @@ import org.pkl.core.util.ErrorMessages;
  * The canonical URI of an asset within a package, i.e., a package URI with a fragment path. For
  * example, {@code package://example.com/my/package@1.0.0#/my/module.pkl}
  */
-public class PackageAssetUri {
+public final class PackageAssetUri {
   private final URI uri;
   private final PackageUri packageUri;
   private final Path assetPath;

pkl-core/src/main/java/org/pkl/core/packages/PackageLoadError.java

@@ -17,7 +17,7 @@ package org.pkl.core.packages;
 
 import org.pkl.core.util.ErrorMessages;
 
-public class PackageLoadError extends RuntimeException {
+public final class PackageLoadError extends RuntimeException {
 
   private final String messageName;
   private final Object[] arguments;

pkl-core/src/main/java/org/pkl/core/packages/PackageResolvers.java

@@ -60,7 +60,9 @@ import org.pkl.core.util.Nullable;
 import org.pkl.core.util.Pair;
 import org.pkl.core.util.json.Json.JsonParseException;
 
-class PackageResolvers {
+final class PackageResolvers {
+  private PackageResolvers() {}
+
   abstract static class AbstractPackageResolver implements PackageResolver {
     @GuardedBy("lock")
     private final EconomicMap<PackageUri, DependencyMetadata> cachedDependencyMetadata;
@@ -245,7 +247,7 @@ class PackageResolvers {
    *
    * <p>This gets used when the cache dir is not set.
    */
-  static class InMemoryPackageResolver extends AbstractPackageResolver {
+  static final class InMemoryPackageResolver extends AbstractPackageResolver {
     @GuardedBy("lock")
     private final EconomicMap<PackageUri, EconomicMap<String, ByteBuffer>> cachedEntries =
         EconomicMaps.create();
@@ -406,7 +408,7 @@ class PackageResolvers {
    * <p>Uses the built-in zip file system in {@link jdk.nio.zipfs} for reading files from the zip
    * archive.
    */
-  static class DiskCachedPackageResolver extends AbstractPackageResolver {
+  static final class DiskCachedPackageResolver extends AbstractPackageResolver {
     private final Path cacheDir;
 
     private final Path tmpDir;

pkl-core/src/main/java/org/pkl/core/packages/PackageUri.java

@@ -23,7 +23,7 @@ import org.pkl.core.util.ErrorMessages;
 import org.pkl.core.util.IoUtils;
 import org.pkl.core.util.Nullable;
 
-public class PackageUri {
+public final class PackageUri {
   private final URI uri;
   private final Version version;
   private final String pathWithoutVersion;

pkl-core/src/main/java/org/pkl/core/packages/PackageUtils.java

@@ -20,7 +20,9 @@ import org.pkl.core.util.ErrorMessages;
 import org.pkl.core.util.json.Json.FormatException;
 import org.pkl.core.util.json.Json.JsonParseException;
 
-public class PackageUtils {
+public final class PackageUtils {
+  private PackageUtils() {}
+
   public static PackageUri parsePackageUriWithoutChecksums(Object obj)
       throws JsonParseException, URISyntaxException {
     if (!(obj instanceof String string)) {

pkl-core/src/main/java/org/pkl/core/parser/ErrorStrategy.java

@@ -20,7 +20,7 @@ import org.antlr.v4.runtime.Parser;
 import org.antlr.v4.runtime.misc.IntervalSet;
 import org.pkl.core.parser.antlr.PklParser;
 
-class ErrorStrategy extends DefaultErrorStrategy {
+final class ErrorStrategy extends DefaultErrorStrategy {
   @Override
   protected void reportNoViableAlternative(Parser parser, NoViableAltException e) {
     var builder = new StringBuilder();

pkl-core/src/main/java/org/pkl/core/parser/LexParseException.java

@@ -67,7 +67,7 @@ public abstract class LexParseException extends RuntimeException {
     return this;
   }
 
-  public static class LexError extends LexParseException {
+  public static final class LexError extends LexParseException {
     public LexError(String message, int line, int column, int length) {
       super(message, line, column, length, Integer.MAX_VALUE);
     }
@@ -79,7 +79,7 @@ public abstract class LexParseException extends RuntimeException {
     }
   }
 
-  public static class IncompleteInput extends ParseError {
+  public static final class IncompleteInput extends ParseError {
     public IncompleteInput(String message, int line, int column, int length) {
       super(message, line, column, length, Integer.MAX_VALUE - 1);
     }

pkl-core/src/main/java/org/pkl/core/parser/Lexer.java

@@ -23,7 +23,7 @@ import org.antlr.v4.runtime.*;
 import org.pkl.core.parser.antlr.PklLexer;
 import org.pkl.core.util.Nullable;
 
-public class Lexer {
+public final class Lexer {
   public static final Set<Integer> KEYWORD_TYPES;
   public static final Set<String> KEYWORD_NAMES;
 

pkl-core/src/main/java/org/pkl/core/parser/Parser.java

@@ -29,7 +29,7 @@ import org.pkl.core.parser.antlr.PklParser;
 import org.pkl.core.parser.antlr.PklParser.*;
 import org.pkl.core.util.Nullable;
 
-public class Parser {
+public final class Parser {
   @TruffleBoundary
   public PklParser createParser(
       TokenStream stream, @Nullable List<LexParseException> errorCollector) {

pkl-core/src/main/java/org/pkl/core/project/CanonicalPackageUri.java

@@ -29,7 +29,7 @@ import org.pkl.core.util.ErrorMessages;
  * package://example.com/foo/bar@0}. Does not include a URI's userinfo, query params or fragment
  * segments.
  */
-public class CanonicalPackageUri {
+public final class CanonicalPackageUri {
   private final URI baseUri;
   private final int majorVersion;
 

pkl-core/src/main/java/org/pkl/core/project/DeclaredDependencies.java

@@ -21,7 +21,7 @@ import org.pkl.core.packages.Dependency.RemoteDependency;
 import org.pkl.core.packages.PackageUri;
 import org.pkl.core.util.Nullable;
 
-public class DeclaredDependencies {
+public final class DeclaredDependencies {
   private final Map<String, RemoteDependency> remoteDependencies;
   private final Map<String, DeclaredDependencies> localDependencies;
   private final URI projectFileUri;

pkl-core/src/main/java/org/pkl/core/project/ProjectDependenciesResolver.java

@@ -43,7 +43,7 @@ import org.pkl.core.util.Nullable;
  *
  * <p>Resolved dependencies have URI `projectpackage` to indicate that they should be project-local.
  */
-public class ProjectDependenciesResolver {
+public final class ProjectDependenciesResolver {
   private final Project project;
   private final PackageResolver packageResolver;
   private final Writer logWriter;

pkl-core/src/main/java/org/pkl/core/project/ProjectDeps.java

@@ -75,7 +75,7 @@ import org.pkl.core.util.json.JsonWriter;
  * </pre>
  * </code>
  */
-public class ProjectDeps {
+public final class ProjectDeps {
   private static final Set<Integer> supportedSchemaVersions = Set.of(1);
 
   private final EconomicMap<CanonicalPackageUri, Dependency> resolvedDependencies;

pkl-core/src/main/java/org/pkl/core/project/ProjectPackager.java

@@ -78,7 +78,7 @@ import org.pkl.core.util.Pair;
  *   <li><em>thepackage@1.0.0.zip.sha256</em> - the SHA-256 checksum of the zip archive
  * </ul>
  */
-public class ProjectPackager {
+public final class ProjectPackager {
   /**
    * Modification time value for all zip entries in a package, to ensure that archives are
    * reproducible.

pkl-core/src/main/java/org/pkl/core/runtime/FileSystemManager.java

@@ -40,7 +40,9 @@ import org.pkl.core.util.EconomicMaps;
  *
  * <p>File systems are only closed when the last usage of it closes.
  */
-public class FileSystemManager {
+public final class FileSystemManager {
+  private FileSystemManager() {}
+
   private static final EconomicMap<URI, FileSystem> fileSystems = EconomicMaps.create();
 
   private static final Map<FileSystem, Integer> counts = new IdentityHashMap<>();
@@ -98,7 +100,7 @@ public class FileSystemManager {
     }
   }
 
-  private static class Handle extends FileSystem {
+  private static final class Handle extends FileSystem {
 
     final FileSystem delegate;
 

pkl-core/src/main/java/org/pkl/core/runtime/KeyLookupSuggestions.java

@@ -22,7 +22,9 @@ import org.pkl.core.ValueFormatter;
 import org.pkl.core.util.Nullable;
 import org.pkl.core.util.StringSimilarity;
 
-public class KeyLookupSuggestions {
+public final class KeyLookupSuggestions {
+  private KeyLookupSuggestions() {}
+
   private static final StringSimilarity STRING_SIMILARITY = new StringSimilarity();
   // 0.77 is just about low enough to consider two three-character
   // keys that differ in their first character similar

pkl-core/src/main/java/org/pkl/core/runtime/MemberLookupSuggestions.java

@@ -24,7 +24,7 @@ import org.pkl.core.util.EconomicMaps;
 import org.pkl.core.util.Nullable;
 import org.pkl.core.util.StringSimilarity;
 
-public class MemberLookupSuggestions {
+public final class MemberLookupSuggestions {
   private static final StringSimilarity STRING_SIMILARITY = new StringSimilarity();
   // 0.77 is just about low enough to consider two three-character
   // names that differ in their first character similar

pkl-core/src/main/java/org/pkl/core/runtime/ProjectModule.java

@@ -17,7 +17,7 @@ package org.pkl.core.runtime;
 
 import static org.pkl.core.PClassInfo.pklProjectUri;
 
-public class ProjectModule extends StdLibModule {
+public final class ProjectModule extends StdLibModule {
   private static final VmTyped instance = VmUtils.createEmptyModule();
 
   static {

pkl-core/src/main/java/org/pkl/core/runtime/StackTraceGenerator.java

@@ -24,7 +24,7 @@ import org.pkl.core.StackFrame;
 import org.pkl.core.ast.MemberNode;
 import org.pkl.core.util.Nullable;
 
-class StackTraceGenerator {
+final class StackTraceGenerator {
   private final VmException exception;
 
   private final List<StackFrame> frames = new ArrayList<>();

pkl-core/src/main/java/org/pkl/core/runtime/StackTraceRenderer.java

@@ -21,7 +21,7 @@ import java.util.function.Function;
 import org.pkl.core.StackFrame;
 import org.pkl.core.util.Nullable;
 
-public class StackTraceRenderer {
+public final class StackTraceRenderer {
   private final Function<StackFrame, StackFrame> frameTransformer;
 
   public StackTraceRenderer(Function<StackFrame, StackFrame> frameTransformer) {

pkl-core/src/main/java/org/pkl/core/runtime/TestRunner.java

@@ -32,7 +32,7 @@ import org.pkl.core.util.MutableBoolean;
 import org.pkl.core.util.MutableReference;
 
 /** Runs test results examples and facts. */
-public class TestRunner {
+public final class TestRunner {
   private static final PklConverter converter = new PklConverter(VmMapping.empty());
   private final boolean overwrite;
   private final StackFrameTransformer stackFrameTransformer;

pkl-core/src/main/java/org/pkl/core/runtime/VmExceptionBuilder.java

@@ -47,7 +47,7 @@ import org.pkl.core.util.Nullable;
  *       preferable but isn't currently used. One problem with special formatting is that error
  *       output doesn't always go to a terminal and hence may be rendered verbatim.)
  */
-public class VmExceptionBuilder {
+public final class VmExceptionBuilder {
 
   private @Nullable Object receiver;
 

pkl-core/src/main/java/org/pkl/core/runtime/VmExceptionRenderer.java

@@ -24,7 +24,7 @@ import org.pkl.core.util.ErrorMessages;
 import org.pkl.core.util.Nullable;
 import org.pkl.core.util.StringBuilderWriter;
 
-public class VmExceptionRenderer {
+public final class VmExceptionRenderer {
   private final @Nullable StackTraceRenderer stackTraceRenderer;
 
   /**

pkl-core/src/main/java/org/pkl/core/runtime/VmFileDetector.java

@@ -19,7 +19,7 @@ import java.nio.file.Path;
 import java.nio.file.spi.FileTypeDetector;
 import org.pkl.core.util.Nullable;
 
-public class VmFileDetector extends FileTypeDetector {
+public final class VmFileDetector extends FileTypeDetector {
   @Override
   public @Nullable String probeContentType(Path path) {
     var fileName = path.getFileName();

pkl-core/src/main/java/org/pkl/core/runtime/VmStackOverflowException.java

@@ -17,7 +17,7 @@ package org.pkl.core.runtime;
 
 import java.util.List;
 
-public class VmStackOverflowException extends VmException {
+public final class VmStackOverflowException extends VmException {
 
   public VmStackOverflowException(StackOverflowError e) {
     super("stackOverflow", e, true, new Object[0], List.of(), null, null, null, null);

pkl-core/src/main/java/org/pkl/core/runtime/VmValueRenderer.java

@@ -28,7 +28,7 @@ import org.pkl.core.util.MutableBoolean;
  * <p>Currently prints fully qualified class name for outermost object (if rendered value is an
  * object) and omits class names otherwise.
  */
-public class VmValueRenderer {
+public final class VmValueRenderer {
   private final int lengthLimit;
   private final String leadingOrTrailingNewline;
   private final String interiorNewline;

pkl-core/src/main/java/org/pkl/core/service/ExecutorSpiImpl.java

@@ -39,7 +39,7 @@ import org.pkl.executor.spi.v1.ExecutorSpiException;
 import org.pkl.executor.spi.v1.ExecutorSpiOptions;
 import org.pkl.executor.spi.v1.ExecutorSpiOptions2;
 
-public class ExecutorSpiImpl implements ExecutorSpi {
+public final class ExecutorSpiImpl implements ExecutorSpi {
   private static final int MAX_HTTP_CLIENTS = 3;
 
   // Don't create a new HTTP client for every executor request.

pkl-core/src/main/java/org/pkl/core/stdlib/PathConverterSupport.java

@@ -17,7 +17,8 @@ package org.pkl.core.stdlib;
 
 import org.pkl.core.runtime.Identifier;
 
-public class PathConverterSupport {
+final class PathConverterSupport {
+  private PathConverterSupport() {}
 
   public static boolean pathMatches(Iterable<Object> pathSpec, Iterable<Object> path) {
     var pathIterator = path.iterator();

pkl-core/src/main/java/org/pkl/core/stdlib/json/ParserNodes.java

@@ -32,7 +32,7 @@ import org.pkl.core.util.json.JsonHandler;
 import org.pkl.core.util.json.JsonParser;
 import org.pkl.core.util.json.ParseException;
 
-public class ParserNodes {
+public final class ParserNodes {
   private ParserNodes() {}
 
   public abstract static class parse extends ExternalMethod1Node {

pkl-core/src/main/java/org/pkl/core/stdlib/test/report/JUnitReport.java

@@ -34,7 +34,7 @@ import org.pkl.core.stdlib.PklConverter;
 import org.pkl.core.stdlib.xml.RendererNodes.Renderer;
 import org.pkl.core.util.EconomicMaps;
 
-public class JUnitReport implements TestReport {
+public final class JUnitReport implements TestReport {
 
   @Override
   public void report(TestResults results, Writer writer) throws IOException {

pkl-core/src/main/java/org/pkl/core/stdlib/test/report/SimpleReport.java

@@ -23,7 +23,7 @@ import org.pkl.core.runtime.TestResults.Failure;
 import org.pkl.core.runtime.TestResults.TestResult;
 import org.pkl.core.util.StringUtils;
 
-public class SimpleReport implements TestReport {
+public final class SimpleReport implements TestReport {
 
   @Override
   public void report(TestResults results, Writer writer) throws IOException {

pkl-core/src/main/java/org/pkl/core/util/ByteArrayUtils.java

@@ -19,7 +19,9 @@ import java.security.MessageDigest;
 import java.security.NoSuchAlgorithmException;
 import org.pkl.core.runtime.VmExceptionBuilder;
 
-public class ByteArrayUtils {
+public final class ByteArrayUtils {
+  private ByteArrayUtils() {}
+
   public static String md5(byte[] input) {
     return hash(input, "MD5");
   }
@@ -38,7 +40,7 @@ public class ByteArrayUtils {
 
   /**
    * Implemented directly instead of using JRE's `new BigInteger.toString(16)` so we can AOT-compile
-   * this and not need a truffle boundary.
+   * this and do not need a Truffle boundary.
    */
   public static String toHex(byte[] hash) {
     //    return new BigInteger(hash).toString(16);

pkl-core/src/main/java/org/pkl/core/util/CollectionUtils.java

@@ -19,7 +19,7 @@ import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
 import java.util.*;
 import java.util.concurrent.ConcurrentHashMap;
 
-public class CollectionUtils {
+public final class CollectionUtils {
   private static final float LOAD_FACTOR = 0.75f;
 
   private CollectionUtils() {}

pkl-core/src/main/java/org/pkl/core/util/ErrorMessages.java

@@ -20,7 +20,9 @@ import java.util.Locale;
 import java.util.ResourceBundle;
 import java.util.stream.*;
 
-public class ErrorMessages {
+public final class ErrorMessages {
+  private ErrorMessages() {}
+
   public static String create(String messageName, Object... args) {
     var locale = Locale.getDefault();
     String errorMessage =

pkl-core/src/main/java/org/pkl/core/util/GlobResolver.java

@@ -33,14 +33,16 @@ import org.pkl.core.module.ModuleKey;
 import org.pkl.core.module.PathElement;
 import org.pkl.core.runtime.ReaderBase;
 
-public class GlobResolver {
+public final class GlobResolver {
-  public static class InvalidGlobPatternException extends Exception {
+  private GlobResolver() {}
+
+  public static final class InvalidGlobPatternException extends Exception {
     public InvalidGlobPatternException(String message) {
       super(message);
     }
   }
 
-  public static class ResolvedGlobElement {
+  public static final class ResolvedGlobElement {
     private final String path;
 
     private final URI uri;

pkl-core/src/main/java/org/pkl/core/util/StringBuilderWriter.java

@@ -17,7 +17,7 @@ package org.pkl.core.util;
 
 import java.io.Writer;
 
-public class StringBuilderWriter extends Writer {
+public final class StringBuilderWriter extends Writer {
   private final StringBuilder builder;
 
   public StringBuilderWriter(StringBuilder builder) {

pkl-core/src/main/java/org/pkl/core/util/StringSimilarity.java

@@ -29,7 +29,7 @@ import javax.annotation.concurrent.Immutable;
  * @author Thibault Debatty
  */
 @Immutable
-public class StringSimilarity {
+public final class StringSimilarity {
   private static final double DEFAULT_THRESHOLD = 0.7;
   private static final int THREE = 3;
   private static final double JW_COEF = 0.1;

pkl-core/src/main/java/org/pkl/core/util/json/Json.java

@@ -68,7 +68,7 @@ import org.pkl.core.util.Nullable;
  * </table>
  */
 @SuppressWarnings("unused")
-public class Json {
+public final class Json {
   @FunctionalInterface
   public interface Mapper<R> {
     R apply(Object arg) throws Exception;

pkl-core/src/main/java/org/pkl/core/util/json/JsonWriter.java

@@ -127,11 +127,11 @@ import org.pkl.core.util.Nullable;
  * @since 1.6
  */
 @SuppressWarnings({"unused", "UnusedReturnValue"})
-public class JsonWriter implements Closeable, Flushable {
+public final class JsonWriter implements Closeable, Flushable {
   /** An array with no elements requires no separators or newlines before it is closed. */
   static final int EMPTY_ARRAY = 1;
 
-  /** A array with at least one value requires a comma and newline before the next element. */
+  /** An array with at least one value requires a comma and newline before the next element. */
   static final int NONEMPTY_ARRAY = 2;
 
   /** An object with no name/value pairs requires no separators or newlines before it is closed. */
@@ -200,7 +200,7 @@ public class JsonWriter implements Closeable, Flushable {
    *
    * @param indent a string containing only whitespace.
    */
-  public final void setIndent(String indent) {
+  public void setIndent(String indent) {
     if (indent.isEmpty()) {
       this.indent = null;
       this.separator = ":";
@@ -221,7 +221,7 @@ public class JsonWriter implements Closeable, Flushable {
    *   <li>Numbers may be {@link Double#isNaN() NaNs} or {@link Double#isInfinite() infinities}.
    * </ul>
    */
-  public final void setLenient(boolean lenient) {
+  public void setLenient(boolean lenient) {
     this.lenient = lenient;
   }
 
@@ -236,7 +236,7 @@ public class JsonWriter implements Closeable, Flushable {
    * them to the stream. Without this setting, your XML/HTML encoder should replace these characters
    * with the corresponding escape sequences.
    */
-  public final void setHtmlSafe(boolean htmlSafe) {
+  public void setHtmlSafe(boolean htmlSafe) {
     this.htmlSafe = htmlSafe;
     this.escaper = new JsonEscaper(htmlSafe);
   }
@@ -244,7 +244,7 @@ public class JsonWriter implements Closeable, Flushable {
   /**
    * Returns true if this writer writes JSON that's safe for inclusion in HTML and XML documents.
    */
-  public final boolean isHtmlSafe() {
+  public boolean isHtmlSafe() {
     return htmlSafe;
   }
 
@@ -252,7 +252,7 @@ public class JsonWriter implements Closeable, Flushable {
    * Sets whether object members are serialized when their value is null. This has no impact on
    * array elements. The default is true.
    */
-  public final void setSerializeNulls(boolean serializeNulls) {
+  public void setSerializeNulls(boolean serializeNulls) {
     this.serializeNulls = serializeNulls;
   }
 
@@ -260,7 +260,7 @@ public class JsonWriter implements Closeable, Flushable {
    * Returns true if object members are serialized when their value is null. This has no impact on
    * array elements. The default is true.
    */
-  public final boolean getSerializeNulls() {
+  public boolean getSerializeNulls() {
     return serializeNulls;
   }
 

pkl-core/src/main/java/org/pkl/core/util/properties/PropertiesUtils.java

@@ -17,7 +17,7 @@ package org.pkl.core.util.properties;
 
 import java.io.BufferedWriter;
 
-public class PropertiesUtils {
+public final class PropertiesUtils {
 
   // Bitmap of characters that need escaping ('\t', '\n', '\f', '\r', ' ', '!', '#', ':', '=', '\\')
   // in four 32-bit segments.

pkl-core/src/main/java/org/pkl/core/util/yaml/Yaml11Emitter.java

@@ -18,7 +18,7 @@ package org.pkl.core.util.yaml;
 import org.pkl.core.util.IoUtils;
 
 @SuppressWarnings("DuplicatedCode")
-public class Yaml11Emitter extends YamlEmitter {
+public final class Yaml11Emitter extends YamlEmitter {
   public Yaml11Emitter(StringBuilder builder, String indent) {
     super(builder, indent);
   }

pkl-core/src/main/java/org/pkl/core/util/yaml/Yaml12Emitter.java

@@ -18,7 +18,7 @@ package org.pkl.core.util.yaml;
 import org.pkl.core.util.IoUtils;
 
 @SuppressWarnings("DuplicatedCode")
-public class Yaml12Emitter extends YamlEmitter {
+public final class Yaml12Emitter extends YamlEmitter {
   public Yaml12Emitter(StringBuilder builder, String indent) {
     super(builder, indent);
   }