diff --git a/spring-core/src/main/java/org/springframework/asm/MethodWriter.java b/spring-core/src/main/java/org/springframework/asm/MethodWriter.java
index eeb51448b9..aaaa3c95a9 100644
--- a/spring-core/src/main/java/org/springframework/asm/MethodWriter.java
+++ b/spring-core/src/main/java/org/springframework/asm/MethodWriter.java
@@ -694,7 +694,7 @@ final class MethodWriter extends MethodVisitor {
     if (visible) {
       if (lastRuntimeVisibleParameterAnnotations == null) {
         lastRuntimeVisibleParameterAnnotations =
-            new AnnotationWriter[Type.getArgumentTypes(descriptor).length];
+            new AnnotationWriter[Type.getArgumentCount(descriptor)];
       }
       return lastRuntimeVisibleParameterAnnotations[parameter] =
           AnnotationWriter.create(
@@ -702,7 +702,7 @@ final class MethodWriter extends MethodVisitor {
     } else {
       if (lastRuntimeInvisibleParameterAnnotations == null) {
         lastRuntimeInvisibleParameterAnnotations =
-            new AnnotationWriter[Type.getArgumentTypes(descriptor).length];
+            new AnnotationWriter[Type.getArgumentCount(descriptor)];
       }
       return lastRuntimeInvisibleParameterAnnotations[parameter] =
           AnnotationWriter.create(
diff --git a/spring-core/src/main/java/org/springframework/asm/Type.java b/spring-core/src/main/java/org/springframework/asm/Type.java
index 48cb1f2ea7..7e35a139c0 100644
--- a/spring-core/src/main/java/org/springframework/asm/Type.java
+++ b/spring-core/src/main/java/org/springframework/asm/Type.java
@@ -295,26 +295,12 @@ public final class Type {
    */
   public static Type[] getArgumentTypes(final String methodDescriptor) {
     // First step: compute the number of argument types in methodDescriptor.
-    int numArgumentTypes = 0;
-    // Skip the first character, which is always a '('.
-    int currentOffset = 1;
-    // Parse the argument types, one at a each loop iteration.
-    while (methodDescriptor.charAt(currentOffset) != ')') {
-      while (methodDescriptor.charAt(currentOffset) == '[') {
-        currentOffset++;
-      }
-      if (methodDescriptor.charAt(currentOffset++) == 'L') {
-        // Skip the argument descriptor content.
-        int semiColumnOffset = methodDescriptor.indexOf(';', currentOffset);
-        currentOffset = Math.max(currentOffset, semiColumnOffset + 1);
-      }
-      ++numArgumentTypes;
-    }
+    int numArgumentTypes = getArgumentCount(methodDescriptor);
 
     // Second step: create a Type instance for each argument type.
     Type[] argumentTypes = new Type[numArgumentTypes];
     // Skip the first character, which is always a '('.
-    currentOffset = 1;
+    int currentOffset = 1;
     // Parse and create the argument types, one at each loop iteration.
     int currentArgumentTypeIndex = 0;
     while (methodDescriptor.charAt(currentOffset) != ')') {
@@ -702,6 +688,43 @@ public final class Type {
     }
   }
 
+  /**
+   * Returns the number of arguments of this method type. This method should only be used for method
+   * types.
+   *
+   * @return the number of arguments of this method type. Each argument counts for 1, even long and
+   *     double ones. The implicit @literal{this} argument is not counted.
+   */
+  public int getArgumentCount() {
+    return getArgumentCount(getDescriptor());
+  }
+
+  /**
+   * Returns the number of arguments in the given method descriptor.
+   *
+   * @param methodDescriptor a method descriptor.
+   * @return the number of arguments in the given method descriptor. Each argument counts for 1,
+   *     even long and double ones. The implicit @literal{this} argument is not counted.
+   */
+  public static int getArgumentCount(final String methodDescriptor) {
+    int argumentCount = 0;
+    // Skip the first character, which is always a '('.
+    int currentOffset = 1;
+    // Parse the argument types, one at a each loop iteration.
+    while (methodDescriptor.charAt(currentOffset) != ')') {
+      while (methodDescriptor.charAt(currentOffset) == '[') {
+        currentOffset++;
+      }
+      if (methodDescriptor.charAt(currentOffset++) == 'L') {
+        // Skip the argument descriptor content.
+        int semiColumnOffset = methodDescriptor.indexOf(';', currentOffset);
+        currentOffset = Math.max(currentOffset, semiColumnOffset + 1);
+      }
+      ++argumentCount;
+    }
+    return argumentCount;
+  }
+
   /**
    * Returns the size of the arguments and of the return value of methods of this type. This method
    * should only be used for method types.
@@ -709,7 +732,8 @@ public final class Type {
    * @return the size of the arguments of the method (plus one for the implicit this argument),
    *     argumentsSize, and the size of its return value, returnSize, packed into a single int i =
    *     {@code (argumentsSize << 2) | returnSize} (argumentsSize is therefore equal to {@code
-   *     i >> 2}, and returnSize to {@code i & 0x03}).
+   *     i >> 2}, and returnSize to {@code i & 0x03}). Long and double values have size 2,
+   *     the others have size 1.
    */
   public int getArgumentsAndReturnSizes() {
     return getArgumentsAndReturnSizes(getDescriptor());
@@ -722,7 +746,8 @@ public final class Type {
    * @return the size of the arguments of the method (plus one for the implicit this argument),
    *     argumentsSize, and the size of its return value, returnSize, packed into a single int i =
    *     {@code (argumentsSize << 2) | returnSize} (argumentsSize is therefore equal to {@code
-   *     i >> 2}, and returnSize to {@code i & 0x03}).
+   *     i >> 2}, and returnSize to {@code i & 0x03}). Long and double values have size 2,
+   *     the others have size 1.
    */
   public static int getArgumentsAndReturnSizes(final String methodDescriptor) {
     int argumentsSize = 1;