Fixed some stuff, made a few small changes, removed Java 16 code

src/main/java/xyz/spruceloader/trunk/MainClient.java

@@ -11,6 +11,9 @@ public static void main(String[] args) {
         argMap.putIfAbsent("accessToken", "None");
         argMap.putIfAbsent("version", "Unknown");
         argMap.putIfAbsent("gameDir", Paths.get(".").normalize().toString());
-        new Trunk().initialize(argMap, EnvSide.CLIENT);
+
+        Trunk trunk = new Trunk();
+        trunk.initialize(argMap, EnvSide.CLIENT);
+        trunk.getClassLoader().addDefaultLoadingFilters();
     }
 }

src/main/java/xyz/spruceloader/trunk/MainServer.java

@@ -9,6 +9,9 @@ public static void main(String[] args) {
         argMap.remove("version");
         argMap.remove("gameDir");
         argMap.remove("assetsDir");
-        new Trunk().initialize(argMap, EnvSide.SERVER);
+
+        Trunk trunk = new Trunk();
+        trunk.initialize(argMap, EnvSide.SERVER);
+        trunk.getClassLoader().addDefaultLoadingFilters();
     }
 }

src/main/java/xyz/spruceloader/trunk/Trunk.java

@@ -11,6 +11,7 @@
 import java.lang.invoke.MethodHandle;
 import java.lang.invoke.MethodHandles;
 import java.lang.invoke.MethodType;
+import java.net.MalformedURLException;
 import java.net.URL;
 import java.nio.file.Files;
 import java.nio.file.Path;
@@ -35,11 +36,12 @@ public Trunk() {
             } catch (Throwable t) {
                 return null;
             }
-        }).filter(Objects::nonNull).collect(Collectors.toList()).toArray(URL[]::new), getClass().getClassLoader());
+        }).filter(Objects::nonNull).collect(Collectors.toList()).toArray(new URL[0]), getClass().getClassLoader());
         transformerManager = new TransformerManager();
         Thread.currentThread().setContextClassLoader(classLoader);
         GLOBAL_PROPERTIES.put("trunk.development", DEVELOPMENT);
     }
+
 
     public void initialize(ArgumentMap argMap, EnvSide env) {
         LOGGER.info("Launching Minecraft with Spruce Trunk");

src/main/java/xyz/spruceloader/trunk/TrunkClassLoader.java

@@ -30,6 +30,19 @@ public void addPath(Path path) {
         }
     }
 
+    /**
+     * Adds the default loading filters. This is subject to change!
+     */
+    public void addDefaultLoadingFilters() {
+        addPackageLoadingFilter("java");
+        addPackageLoadingFilter("jdk");
+        addPackageLoadingFilter("javax");
+        addPackageLoadingFilter("sun");
+        addPackageLoadingFilter("com.sun");
+        addPackageLoadingFilter("org.apache.logging.log4j");
+        addPackageLoadingFilter("org.slf4j");
+    }
+
     /**
      * Adds a loading filter - returns true to filter the class.
      *
@@ -130,7 +143,7 @@ private byte[] transformClassBytes(String name, byte[] bytes) {
     }
 
     private byte[] getClassBytes(String name) throws IOException {
-        try (InputStream in = getResourceAsStream(name)) {
+        try (InputStream in = getResourceAsStream(name.replace(".", "/").concat(".class"))) {
             if (in == null)
                 return null;
 

src/main/java/xyz/spruceloader/trunk/api/TransformerManager.java

@@ -9,6 +9,7 @@
 import java.util.Iterator;
 import java.util.List;
 import java.util.Objects;
+import java.util.stream.Collectors;
 
 public class TransformerManager implements Iterable<Transformer> {
 
@@ -44,8 +45,9 @@ private void handleFromNamespaces(ArgumentMap argMap, String argName, String pro
             argValues.forEach(name -> transformers.add(fromName(name)));
 
         String prop = System.getProperty(propName);
+
         if (prop != null) {
-            List<String> propValues = Arrays.stream(prop.split("/")).toList();
+            List<String> propValues = Arrays.stream(prop.split("/")).collect(Collectors.toList());
             if (!propValues.isEmpty())
                 propValues.forEach(name -> transformers.add(fromName(name)));
         }