diff --git a/buildSrc/src/main/java/io/github/jwharm/javagi/generator/Builder.java b/buildSrc/src/main/java/io/github/jwharm/javagi/generator/Builder.java
index 51de21d3..4224fda8 100644
--- a/buildSrc/src/main/java/io/github/jwharm/javagi/generator/Builder.java
+++ b/buildSrc/src/main/java/io/github/jwharm/javagi/generator/Builder.java
@@ -94,7 +94,7 @@ public static void generateBuilder(SourceWriter writer, io.github.jwharm.javagi.
         writer.write("\n");
         writer.write("/**\n");
         writer.write(" * Finish building the {@code " + c.javaName + "} object. This will call \n");
-        writer.write(" * {@link org.gnome.gobject.GObject#newWithProperties} to create a new \n");
+        writer.write(" * {@link org.gnome.gobject.GObject#withProperties} to create a new \n");
         writer.write(" * GObject instance, which is then cast to {@code " + c.javaName + "}.\n");
         writer.write(" * @return A new instance of {@code " + c.javaName + "} with the properties \n");
         writer.write(" *         that were set in the Builder object.\n");
@@ -107,7 +107,7 @@ public static void generateBuilder(SourceWriter writer, io.github.jwharm.javagi.
         writer.write("try {\n");
         writer.increaseIndent();
         c.generatePlatformCheck(writer);
-        writer.write("return (" + c.qualifiedName + ") org.gnome.gobject.GObject.newWithProperties(\n");
+        writer.write("return (" + c.qualifiedName + ") org.gnome.gobject.GObject.withProperties(\n");
         writer.write("        " + c.qualifiedName + ".getType(), getNames(), getValues()\n");
         writer.write(");\n");
         writer.decreaseIndent();
diff --git a/buildSrc/src/main/java/io/github/jwharm/javagi/generator/Conversions.java b/buildSrc/src/main/java/io/github/jwharm/javagi/generator/Conversions.java
index a2e3d8d7..a991dfc3 100644
--- a/buildSrc/src/main/java/io/github/jwharm/javagi/generator/Conversions.java
+++ b/buildSrc/src/main/java/io/github/jwharm/javagi/generator/Conversions.java
@@ -145,7 +145,7 @@ private static String replaceKeywords(String name) {
                 "protected", "throw", "byte", "else", "import", "public", "throws", "case", "enum",
                 "instanceof", "return", "transient", "catch", "extends", "int", "short", "try", "char",
                 "final", "interface", "static", "void", "class", "finally", "long", "strictfp", "volatile",
-                "const", "float", "native", "super", "while", "wait", "finalize"
+                "const", "float", "native", "super", "while", "wait", "finalize", "null"
         };
         return Arrays.stream(keywords).anyMatch(kw -> kw.equalsIgnoreCase(name)) ? name + "_" : name;
     }
diff --git a/buildSrc/src/main/java/io/github/jwharm/javagi/generator/Javadoc.java b/buildSrc/src/main/java/io/github/jwharm/javagi/generator/Javadoc.java
index d07365bd..492881c0 100644
--- a/buildSrc/src/main/java/io/github/jwharm/javagi/generator/Javadoc.java
+++ b/buildSrc/src/main/java/io/github/jwharm/javagi/generator/Javadoc.java
@@ -227,7 +227,7 @@ private String convertLink(String link, String type, String path,
                     if ("new".equals(part2)) {
                         return checkLink(part1) + part1 + "#" + part1 + "}";
                     } else {
-                        return checkLink(part1, part2) + part1 + formatMethod(part2) + "}";
+                        return checkLink(part1, part2) + part1 + formatMethod(stripNewPrefix(part2)) + "}";
                     }
                 } else {
                     Namespace ns = getNamespace(part1);
@@ -235,7 +235,7 @@ private String convertLink(String link, String type, String path,
                     if ("new".equals(part3)) {
                         return checkLink(part1, part2) + formatNS(part1) + className + "#" + className + "}";
                     } else {
-                        return checkLink(part1, part2, part3) + formatNS(part1) + className + formatMethod(part3) + "}";
+                        return checkLink(part1, part2, part3) + formatNS(part1) + className + formatMethod(stripNewPrefix(part3)) + "}";
                     }
                 }
             case "method":
@@ -403,6 +403,11 @@ private String formatMethod(String name) {
         return "#" + Conversions.toLowerCaseJavaName(name);
     }
 
+    // Strip "new_" prefix from named constructors
+    private String stripNewPrefix(String name) {
+        return name.startsWith("new_") ? name.substring(4) : name;
+    }
+
     // Format the type as a Java type (with org.package.Class#methodName syntax)
     private String girElementToString(GirElement girElement, boolean uppercase) {
         if (girElement == null) {
diff --git a/buildSrc/src/main/java/io/github/jwharm/javagi/model/Constructor.java b/buildSrc/src/main/java/io/github/jwharm/javagi/model/Constructor.java
index 0b03a3c0..8ca4ca00 100644
--- a/buildSrc/src/main/java/io/github/jwharm/javagi/model/Constructor.java
+++ b/buildSrc/src/main/java/io/github/jwharm/javagi/model/Constructor.java
@@ -30,6 +30,11 @@ public Constructor(GirElement parent, String name, String cIdentifier, String de
         super(parent, name, cIdentifier, deprecated, throws_, null, null, null);
         // constructor helper method has private visibility
         visibility = "private";
+
+        // Strip the "new" prefix from named constructors
+        if (name.startsWith("new_")) {
+            this.name = name.substring(4);
+        }
     }
 
     public void generate(SourceWriter writer) throws IOException {
diff --git a/buildSrc/src/main/java/io/github/jwharm/javagi/model/Method.java b/buildSrc/src/main/java/io/github/jwharm/javagi/model/Method.java
index 82e31c24..ccd6bbdb 100644
--- a/buildSrc/src/main/java/io/github/jwharm/javagi/model/Method.java
+++ b/buildSrc/src/main/java/io/github/jwharm/javagi/model/Method.java
@@ -173,7 +173,7 @@ public void generate(SourceWriter writer) throws IOException {
         // Documentation
         if (this instanceof Constructor) {
             writer.write("/**\n");
-            writer.write(" * Helper function for the {@code " + name + "} constructor\n");
+            writer.write(" * Helper function for the {@code " + cIdentifier + "} constructor\n");
             writer.write(" */\n");
         } else if (doc != null) {
             doc.generate(writer, false);
diff --git a/buildSrc/src/main/java/io/github/jwharm/javagi/patches/GLibPatch.java b/buildSrc/src/main/java/io/github/jwharm/javagi/patches/GLibPatch.java
index 8145a475..4b4d5a8a 100644
--- a/buildSrc/src/main/java/io/github/jwharm/javagi/patches/GLibPatch.java
+++ b/buildSrc/src/main/java/io/github/jwharm/javagi/patches/GLibPatch.java
@@ -21,34 +21,34 @@ public void patch(Repository repo) {
         pid.isPrimitive = true;
 
         // These calls return floating references
-        setReturnFloating(findConstructor(repo, "Variant", "new_array"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_boolean"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_byte"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_bytestring"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_bytestring_array"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_dict_entry"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_double"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_fixed_array"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_from_bytes"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_handle"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_int16"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_int32"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_int64"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_maybe"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_object_path"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_objv"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_parsed"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_parsed_va"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_printf"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_signature"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_string"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_strv"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_take_string"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_tuple"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_uint16"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_uint32"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_uint64"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_va"));
-        setReturnFloating(findConstructor(repo, "Variant", "new_variant"));
+        setReturnFloating(findConstructor(repo, "Variant", "array"));
+        setReturnFloating(findConstructor(repo, "Variant", "boolean"));
+        setReturnFloating(findConstructor(repo, "Variant", "byte"));
+        setReturnFloating(findConstructor(repo, "Variant", "bytestring"));
+        setReturnFloating(findConstructor(repo, "Variant", "bytestring_array"));
+        setReturnFloating(findConstructor(repo, "Variant", "dict_entry"));
+        setReturnFloating(findConstructor(repo, "Variant", "double"));
+        setReturnFloating(findConstructor(repo, "Variant", "fixed_array"));
+        setReturnFloating(findConstructor(repo, "Variant", "from_bytes"));
+        setReturnFloating(findConstructor(repo, "Variant", "handle"));
+        setReturnFloating(findConstructor(repo, "Variant", "int16"));
+        setReturnFloating(findConstructor(repo, "Variant", "int32"));
+        setReturnFloating(findConstructor(repo, "Variant", "int64"));
+        setReturnFloating(findConstructor(repo, "Variant", "maybe"));
+        setReturnFloating(findConstructor(repo, "Variant", "object_path"));
+        setReturnFloating(findConstructor(repo, "Variant", "objv"));
+        setReturnFloating(findConstructor(repo, "Variant", "parsed"));
+        setReturnFloating(findConstructor(repo, "Variant", "parsed_va"));
+        setReturnFloating(findConstructor(repo, "Variant", "printf"));
+        setReturnFloating(findConstructor(repo, "Variant", "signature"));
+        setReturnFloating(findConstructor(repo, "Variant", "string"));
+        setReturnFloating(findConstructor(repo, "Variant", "strv"));
+        setReturnFloating(findConstructor(repo, "Variant", "take_string"));
+        setReturnFloating(findConstructor(repo, "Variant", "tuple"));
+        setReturnFloating(findConstructor(repo, "Variant", "uint16"));
+        setReturnFloating(findConstructor(repo, "Variant", "uint32"));
+        setReturnFloating(findConstructor(repo, "Variant", "uint64"));
+        setReturnFloating(findConstructor(repo, "Variant", "va"));
+        setReturnFloating(findConstructor(repo, "Variant", "variant"));
     }
 }
diff --git a/modules/gio/src/test/java/io/github/jwharm/javagi/test/gio/ValueTest.java b/modules/gio/src/test/java/io/github/jwharm/javagi/test/gio/ValueTest.java
index f247d6dd..e3cac376 100644
--- a/modules/gio/src/test/java/io/github/jwharm/javagi/test/gio/ValueTest.java
+++ b/modules/gio/src/test/java/io/github/jwharm/javagi/test/gio/ValueTest.java
@@ -97,7 +97,7 @@ public void objectValue() {
     @Test
     public void boxedValue() {
         // compare a boxed value with its duplicate
-        Date date = Date.newDmy(new DateDay((byte) 3), DateMonth.JUNE, new DateYear((short) 2023));
+        Date date = Date.dmy(new DateDay((byte) 3), DateMonth.JUNE, new DateYear((short) 2023));
         Value boxedValue = Value.allocate(Arena.ofAuto()).init(Date.getType());
         boxedValue.setBoxed(date.handle());
         var copy = boxedValue.dupBoxed();
diff --git a/modules/gobject/src/main/java/io/github/jwharm/javagi/gobject/JavaClosure.java b/modules/gobject/src/main/java/io/github/jwharm/javagi/gobject/JavaClosure.java
index 1d2e635b..59f68f8f 100644
--- a/modules/gobject/src/main/java/io/github/jwharm/javagi/gobject/JavaClosure.java
+++ b/modules/gobject/src/main/java/io/github/jwharm/javagi/gobject/JavaClosure.java
@@ -19,7 +19,6 @@
 
 package io.github.jwharm.javagi.gobject;
 
-import java.lang.foreign.MemorySegment;
 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
@@ -28,7 +27,6 @@
 import org.gnome.glib.GLib;
 import org.gnome.glib.LogLevelFlags;
 import org.gnome.gobject.Closure;
-import org.gnome.gobject.ClosureMarshal;
 import org.gnome.gobject.Value;
 
 import static io.github.jwharm.javagi.Constants.LOG_DOMAIN;
@@ -45,8 +43,8 @@ public class JavaClosure extends Closure {
      * @param callback a callback with signature {@code void run()}
      */
     public JavaClosure(Runnable callback) {
-        super(Closure.newSimple((int) Closure.getMemoryLayout().byteSize(), null).handle());
-        setMarshal((closure, returnValue, args, hint, marshalData) -> callback.run());
+        super(Closure.simple((int) Closure.getMemoryLayout().byteSize(), null).handle());
+        setMarshal((closure, returnValue, paramValues, hint, data) -> callback.run());
     }
     
     /**
@@ -54,8 +52,11 @@ public JavaClosure(Runnable callback) {
      * @param callback a callback with signature {@code boolean run()}
      */
     public JavaClosure(BooleanSupplier callback) {
-        super(Closure.newSimple((int) Closure.getMemoryLayout().byteSize(), null).handle());
-        setMarshal((closure, returnValue, args, hint, marshalData) -> returnValue.setBoolean(callback.getAsBoolean()));
+        super(Closure.simple((int) Closure.getMemoryLayout().byteSize(), null).handle());
+        setMarshal((closure, returnValue, paramValues, hint, data) -> {
+            if (returnValue != null)
+                returnValue.setBoolean(callback.getAsBoolean());
+        });
     }
 
     /**
@@ -112,45 +113,43 @@ public static Method getSingleMethod(Class<?> functionalInterfaceClass) throws I
      * @param method   the method to invoke. See {@link Method#invoke(Object, Object...)}
      */
     public JavaClosure(Object instance, Method method) {
-        super(Closure.newSimple((int) Closure.getMemoryLayout().byteSize(), null).handle());
-        setMarshal(new ClosureMarshal() {
-            public void run(Closure closure, Value returnValue, Value[] paramValues, MemorySegment invocationHint, MemorySegment marshalData) {
-                try {
-                    Object[] parameterObjects;
-                    if (paramValues == null || paramValues.length == 0) {
-                        parameterObjects = new Object[0];
-                    } else {
-                        // Convert the parameter Values into Java Objects
-                        parameterObjects = new Object[paramValues.length - 1];
-                        for (int v = 1; v < paramValues.length; v++) {
-                            parameterObjects[v - 1] = ValueUtil.valueToObject(paramValues[v]);
-                        }
+        super(Closure.simple((int) Closure.getMemoryLayout().byteSize(), null).handle());
+        setMarshal((closure, returnValue, paramValues, hint, data) -> {
+            try {
+                Object[] parameterObjects;
+                if (paramValues == null || paramValues.length == 0) {
+                    parameterObjects = new Object[0];
+                } else {
+                    // Convert the parameter Values into Java Objects
+                    parameterObjects = new Object[paramValues.length - 1];
+                    for (int v = 1; v < paramValues.length; v++) {
+                        parameterObjects[v - 1] = ValueUtil.valueToObject(paramValues[v]);
                     }
-                    // Invoke the method
-                    method.setAccessible(true);
-                    Object result = method.invoke(instance, parameterObjects);
-
-                    // Convert the returned Object to a GValue
-                    ValueUtil.objectToValue(result, returnValue);
-                } catch (InvocationTargetException e) {
-                    GLib.log(
-                            LOG_DOMAIN,
-                            LogLevelFlags.LEVEL_CRITICAL,
-                            "JavaClosure: Exception in method %s in class %s: %s\n",
-                            method.getName(),
-                            instance == null ? "null" : instance.getClass().getName(),
-                            e.getCause().toString()
-                    );
-                } catch (Exception e) {
-                    GLib.log(
-                            LOG_DOMAIN,
-                            LogLevelFlags.LEVEL_CRITICAL,
-                            "JavaClosure: Cannot invoke method %s in class %s: %s\n",
-                            method == null ? "null" : method.getName(),
-                            instance == null ? "null" : instance.getClass().getName(),
-                            e.toString()
-                    );
                 }
+                // Invoke the method
+                method.setAccessible(true);
+                Object result = method.invoke(instance, parameterObjects);
+
+                // Convert the returned Object to a GValue
+                ValueUtil.objectToValue(result, returnValue);
+            } catch (InvocationTargetException e) {
+                GLib.log(
+                        LOG_DOMAIN,
+                        LogLevelFlags.LEVEL_CRITICAL,
+                        "JavaClosure: Exception in method %s in class %s: %s\n",
+                        method.getName(),
+                        instance == null ? "null" : instance.getClass().getName(),
+                        e.getCause().toString()
+                );
+            } catch (Exception e) {
+                GLib.log(
+                        LOG_DOMAIN,
+                        LogLevelFlags.LEVEL_CRITICAL,
+                        "JavaClosure: Cannot invoke method %s in class %s: %s\n",
+                        method == null ? "null" : method.getName(),
+                        instance == null ? "null" : instance.getClass().getName(),
+                        e.toString()
+                );
             }
         });
     }
diff --git a/modules/gobject/src/main/java/io/github/jwharm/javagi/gobject/types/Properties.java b/modules/gobject/src/main/java/io/github/jwharm/javagi/gobject/types/Properties.java
index 60a74dde..22567d50 100644
--- a/modules/gobject/src/main/java/io/github/jwharm/javagi/gobject/types/Properties.java
+++ b/modules/gobject/src/main/java/io/github/jwharm/javagi/gobject/types/Properties.java
@@ -145,7 +145,7 @@ public static <T extends GObject> T newGObjectWithProperties(Type objectType, Ob
                 // Create and return the GObject with the property names and values
                 // The cast to T is safe: it will always return the expected GObject-derived objectType
                 @SuppressWarnings("unchecked")
-                T gobject = (T) GObject.newWithProperties(objectType, names.toArray(new String[0]), values.toArray(new Value[0]));
+                T gobject = (T) GObject.withProperties(objectType, names.toArray(new String[0]), values.toArray(new Value[0]));
                 return gobject;
             } finally {
                 typeClass.unref();