diff --git a/grails-core/src/main/groovy/grails/util/GrailsClassUtils.java b/grails-core/src/main/groovy/grails/util/GrailsClassUtils.java
index b39ce091745..18da480535d 100644
--- a/grails-core/src/main/groovy/grails/util/GrailsClassUtils.java
+++ b/grails-core/src/main/groovy/grails/util/GrailsClassUtils.java
@@ -1016,11 +1016,12 @@ public static String getSetterName(String propertyName) {
     }
 
     /**
-     * Returns true if the name of the method specified and the number of arguments make it a javabean property
+     * Returns true if the name of the method specified and the number of arguments make it a javabean property getter.
+     * The name is assumed to be a valid Java method name, that is not verified.
      *
-     * @param name True if its a Javabean property
+     * @param name The name of the method
      * @param args The arguments
-     * @return true if it is a javabean property method
+     * @return true if it is a javabean property getter
      */
     public static boolean isGetter(String name, Class<?>[] args) {
         if (!StringUtils.hasText(name) || args == null)return false;
@@ -1049,90 +1050,121 @@ else if (name.startsWith("is")) {
      *     <li>Word</li>
      *     <li>aProperty</li>
      *     <li>S</li>
+     *     <li>X567</li>
      * </ul>
      *
-     * Example sof suffixes that would not be considered property getters:
+     * Examples of suffixes that would not be considered property getters:
      * <ul>
      *     <li>someProperty</li>
      *     <li>word</li>
      *     <li>s</li>
+     *     <li>x567</li>
+     *     <li>2other</li>
+     *     <li>5</li>
      * </ul>
+     *
+     * A suffix like <code>prop</code> from a method <code>getprop()</code> is
+     * not recognized as a valid suffix. However Groovy will recognize such a
+     * method as a property getter but only if a method <code>getProp()</code> or
+     * a property <code>prop</code> does not also exist. The Java Beans
+     * specification is unclear on how to treat such method names, it only says
+     * that "by default" the suffix will start with a capital letter because of
+     * the camel case style usually used. (See the JavaBeans API specification
+     * sections 8.3 and 8.8.)
+     *
+     * This method assumes that all characters in the name are valid Java identifier
+     * letters.
+     *
      * @param suffix The suffix to inspect
      * @return true if suffix indicates a property name
      */
     protected static boolean isPropertyMethodSuffix(String suffix) {
-        if (suffix.length() > 0) {
-            if(suffix.length() == 1) {
-                if(Character.isUpperCase(suffix.charAt(0))) {
-                    return true;
-                }
-            } else {
-                if(Character.isUpperCase(suffix.charAt(0)) ||
-                   (Character.isUpperCase(suffix.charAt(1)) && Character.isLowerCase(suffix.charAt(0)))) {
-                    return true;
-                }
-            }
-        }
-        return false;
+        if(suffix.length() == 0) return false;
+        if(!Character.isJavaIdentifierStart(suffix.charAt(0))) return false;
+        if(suffix.length() == 1) return Character.isUpperCase(suffix.charAt(0));
+        return Character.isUpperCase(suffix.charAt(0)) || Character.isUpperCase(suffix.charAt(1));
     }
 
     /**
-     * Returns a property name equivalent for the given getter name or null if it is not a getter
+     * Returns a property name equivalent for the given getter name or null if it is not a valid getter. If not null
+     * or empty the getter name is assumed to be a valid identifier.
      *
      * @param getterName The getter name
      * @return The property name equivalent
      */
     public static String getPropertyForGetter(String getterName) {
-        if (!StringUtils.hasText(getterName))return null;
+        if (getterName == null || getterName.length() == 0) return null;
 
         if (getterName.startsWith("get")) {
             String prop = getterName.substring(3);
-            return convertPropertyName(prop);
+            return convertValidPropertyMethodSuffix(prop);
         }
         if (getterName.startsWith("is")) {
             String prop = getterName.substring(2);
-            return convertPropertyName(prop);
+            return convertValidPropertyMethodSuffix(prop);
         }
         return null;
     }
 
-    private static String convertPropertyName(String prop) {
-        if (prop.length() == 1) {
-            return prop.toLowerCase();
+    /**
+     * This method functions the same as {@link #isPropertyMethodSuffix(String)},
+     * but in addition returns the property name, or null if not a valid property.
+     *
+     * @param suffix The suffix to inspect
+     * @return The property name or null
+     */
+    private static String convertValidPropertyMethodSuffix(String suffix) {
+        if (suffix.length() == 0) return null;
+
+        // We assume all characters are Character.isJavaIdentifierPart, but the first one may not be a valid
+        // starting character.
+        if (!Character.isJavaIdentifierStart(suffix.charAt(0))) return null;
+
+        if (suffix.length() == 1) {
+            return Character.isUpperCase(suffix.charAt(0)) ? suffix.toLowerCase() : null;
         }
-        if (Character.isUpperCase(prop.charAt(0)) && Character.isUpperCase(prop.charAt(1))) {
-            return prop;
+        if (Character.isUpperCase(suffix.charAt(1))) {
+            // "aProperty", "AProperty"
+            return suffix;
         }
-        if (Character.isDigit(prop.charAt(0))) {
-            return prop;
+        if (Character.isUpperCase(suffix.charAt(0))) {
+            return Character.toLowerCase(suffix.charAt(0)) + suffix.substring(1);
         }
-        return Character.toLowerCase(prop.charAt(0)) + prop.substring(1);
+        return null;
     }
 
     /**
-     * Returns a property name equivalent for the given setter name or null if it is not a getter
+     * Returns a property name equivalent for the given setter name or null if it is not a valid setter. If not null
+     * or empty the setter name is assumed to be a valid identifier.
      *
-     * @param setterName The setter name
+     * @param setterName The setter name, must be null or empty or a valid identifier name
      * @return The property name equivalent
      */
     public static String getPropertyForSetter(String setterName) {
-        if (!StringUtils.hasText(setterName))return null;
+        if (setterName == null || setterName.length() == 0) return null;
 
         if (setterName.startsWith("set")) {
             String prop = setterName.substring(3);
-            return convertPropertyName(prop);
+            return convertValidPropertyMethodSuffix(prop);
         }
         return null;
     }
 
+    /**
+     * Returns true if the name of the method specified and the number of arguments make it a javabean property setter.
+     * The name is assumed to be a valid Java method name, that is not verified.
+     *
+     * @param name The name of the method
+     * @param args The arguments
+     * @return true if it is a javabean property setter
+     */
     @SuppressWarnings("rawtypes")
     public static boolean isSetter(String name, Class[] args) {
         if (!StringUtils.hasText(name) || args == null)return false;
 
         if (name.startsWith("set")) {
             if (args.length != 1) return false;
-            name = name.substring(3);
-            if (name.length() > 0 && Character.isUpperCase(name.charAt(0))) return true;
+            return isPropertyMethodSuffix(name.substring(3));
         }
 
         return false;
diff --git a/grails-core/src/main/groovy/org/grails/core/util/ClassPropertyFetcher.java b/grails-core/src/main/groovy/org/grails/core/util/ClassPropertyFetcher.java
index 43e9d072eff..c73c8eb768a 100644
--- a/grails-core/src/main/groovy/org/grails/core/util/ClassPropertyFetcher.java
+++ b/grails-core/src/main/groovy/org/grails/core/util/ClassPropertyFetcher.java
@@ -126,31 +126,24 @@ public void doWith(CachedMethod method) throws IllegalArgumentException,
                 if (!method.isPublic()) {
                     return;
                 }
-                if (returnType != Void.class && returnType != void.class) {
-                    if (method.getParameterTypes().length == 0) {
-                        String name = method.getName();
-                        if (name.indexOf('$') == -1) {
-                            if (name.length() > 3 && name.startsWith("get")
-                                    && Character.isUpperCase(name.charAt(3))) {
-                                name = name.substring(3);
-                            } else if (name.length() > 2
-                                    && name.startsWith("is")
-                                    && Character.isUpperCase(name.charAt(2))
-                                    && (returnType == Boolean.class ||
-                                    returnType == boolean.class)) {
-                                name = name.substring(2);
-                            }
-                            if (method.isStatic()) {
-                                GetterPropertyFetcher fetcher = new GetterPropertyFetcher(method, true);
-                                staticFetchers.put(name, fetcher);
-                                staticFetchers.put(StringUtils.uncapitalize(name),
-                                        fetcher);
-                            } else {
-                                instanceFetchers.put(StringUtils.uncapitalize(name),
-                                        new GetterPropertyFetcher(method, false));
-                            }
-                        }
-                    }
+                if (returnType == Void.class || returnType == void.class || method.getParameterTypes().length != 0) {
+                    return;
+                }
+
+                String propertyName = GrailsClassUtils.getPropertyForGetter(method.getName());
+                if(propertyName == null || propertyName.indexOf('$') != -1) {
+                    return;
+                }
+
+                if (method.getName().startsWith("is") &&
+                            !(returnType == Boolean.class || returnType == boolean.class)) {
+                    return;
+                }
+
+                if (method.isStatic()) {
+                    staticFetchers.put(propertyName, new GetterPropertyFetcher(method, true));
+                } else {
+                    instanceFetchers.put(propertyName, new GetterPropertyFetcher(method, false));
                 }
             }
         };
diff --git a/grails-core/src/test/groovy/org/grails/core/util/ClassPropertyFetcherSpec.groovy b/grails-core/src/test/groovy/org/grails/core/util/ClassPropertyFetcherSpec.groovy
index c76678b6f13..a82dab0d959 100644
--- a/grails-core/src/test/groovy/org/grails/core/util/ClassPropertyFetcherSpec.groovy
+++ b/grails-core/src/test/groovy/org/grails/core/util/ClassPropertyFetcherSpec.groovy
@@ -15,9 +15,20 @@ class ClassPropertyFetcherSpec extends Specification {
         cpf.getPropertyValue(new Author(name: "Fred"),"name") == "Fred"
         cpf.getPropertyValue(new Author(name: "Fred", books: ["test"]),"books").contains "test"
     }
+
+    void "test properties that have the fifth letter of their getter capitalized instead of the fourth"() {
+        when:"A class property fetcher is created"
+        def cpf = ClassPropertyFetcher.forClass(Person)
+
+        then:"all properties are correct"
+        def person = new Person(name: "Fred", xAge: 30)
+        person.getxAge() == 30
+        cpf.getPropertyValue(person, "xAge") == 30
+    }
 }
 class Person {
     String name
+    Integer xAge
 }
 class Author extends Person {
     Set books
diff --git a/grails-test-suite-uber/src/test/groovy/org/grails/commons/GrailsClassUtilsTests.java b/grails-test-suite-uber/src/test/groovy/org/grails/commons/GrailsClassUtilsTests.java
index 7bb92d5b23f..944c6545270 100644
--- a/grails-test-suite-uber/src/test/groovy/org/grails/commons/GrailsClassUtilsTests.java
+++ b/grails-test-suite-uber/src/test/groovy/org/grails/commons/GrailsClassUtilsTests.java
@@ -113,8 +113,19 @@ public void testGetterNames() {
     public void testIsGetterOrSetter() {
         assertTrue(GrailsClassUtils.isSetter("setSomething", new Class[] { String.class }));
         assertTrue(GrailsClassUtils.isGetter("getSomething", new Class[0]));
+        assertTrue(GrailsClassUtils.isGetter("isSomething", new Class[0]));
         assertTrue(GrailsClassUtils.isSetter("setURL", new Class[] { String.class }));
         assertTrue(GrailsClassUtils.isGetter("getURL", new Class[0]));
+        assertTrue(GrailsClassUtils.isGetter("isURL", new Class[0]));
+        assertTrue(GrailsClassUtils.isSetter("setaProp", new Class[] { String.class }));
+        assertTrue(GrailsClassUtils.isGetter("getaProp", new Class[0]));
+        assertTrue(GrailsClassUtils.isGetter("isaProp", new Class[0]));
+        assertTrue(GrailsClassUtils.isSetter("setX", new Class[] { String.class }));
+        assertTrue(GrailsClassUtils.isGetter("getX", new Class[0]));
+        assertTrue(GrailsClassUtils.isGetter("isX", new Class[0]));
+        assertTrue(GrailsClassUtils.isSetter("setX2", new Class[] { String.class }));
+        assertTrue(GrailsClassUtils.isGetter("getX2", new Class[0]));
+        assertTrue(GrailsClassUtils.isGetter("isX2", new Class[0]));
 
         assertFalse(GrailsClassUtils.isGetter("something", new Class[] { String.class }));
         assertFalse(GrailsClassUtils.isGetter("get", new Class[0]));
@@ -123,6 +134,20 @@ public void testIsGetterOrSetter() {
         assertFalse(GrailsClassUtils.isSetter("setSomething", new Class[] { String.class, Object.class }));
         assertFalse(GrailsClassUtils.isGetter("getSomething", new Class[] { Object.class }));
 
+        assertFalse(GrailsClassUtils.isGetter("getsomething", new Class[0]));
+        assertFalse(GrailsClassUtils.isGetter("issomething", new Class[0]));
+        assertFalse(GrailsClassUtils.isSetter("setsomething", new Class[] { String.class }));
+        assertFalse(GrailsClassUtils.isGetter("get0", new Class[0]));
+        assertFalse(GrailsClassUtils.isSetter("set0", new Class[] { String.class }));
+        assertFalse(GrailsClassUtils.isGetter("get2other", new Class[0]));
+        assertFalse(GrailsClassUtils.isSetter("set2other", new Class[] { String.class }));
+        assertFalse(GrailsClassUtils.isGetter("getq3", new Class[0]));
+        assertFalse(GrailsClassUtils.isSetter("setq3", new Class[] { String.class }));
+        assertFalse(GrailsClassUtils.isGetter("get5A", new Class[0]));
+        assertFalse(GrailsClassUtils.isSetter("set5A", new Class[] { String.class }));
+        assertFalse(GrailsClassUtils.isGetter("", new Class[0]));
+        assertFalse(GrailsClassUtils.isSetter("", new Class[] { String.class }));
+
         assertFalse(GrailsClassUtils.isGetter(null, new Class[] { Object.class }));
         assertFalse(GrailsClassUtils.isGetter("getSomething", null));
         assertFalse(GrailsClassUtils.isGetter(null, null));
@@ -132,6 +157,21 @@ public void testGetPropertyForGetter() {
         assertEquals("something", GrailsClassUtils.getPropertyForGetter("getSomething"));
         assertEquals("URL", GrailsClassUtils.getPropertyForGetter("getURL"));
         assertEquals("p", GrailsClassUtils.getPropertyForGetter("getP"));
+        assertEquals("URL", GrailsClassUtils.getPropertyForGetter("isURL"));
+        assertEquals("aProp", GrailsClassUtils.getPropertyForGetter("getaProp"));
+        assertEquals("x2", GrailsClassUtils.getPropertyForGetter("getX2"));
+        assertEquals("x2", GrailsClassUtils.getPropertyForGetter("isX2"));
+
+        assertNull(GrailsClassUtils.getPropertyForGetter(null));
+        assertNull(GrailsClassUtils.getPropertyForGetter(""));
+        assertNull(GrailsClassUtils.getPropertyForGetter("get0"));
+        assertNull(GrailsClassUtils.getPropertyForGetter("get2other"));
+        assertNull(GrailsClassUtils.getPropertyForGetter("getq3"));
+        assertNull(GrailsClassUtils.getPropertyForGetter("get5A"));
+        assertNull(GrailsClassUtils.getPropertyForGetter("setSomething"));
+        assertNull(GrailsClassUtils.getPropertyForGetter("getit"));
+        assertNull(GrailsClassUtils.getPropertyForGetter("geta"));
+        assertNull(GrailsClassUtils.getPropertyForGetter("get0"));
     }
 
     public void testGetStaticField() {