diff --git a/src/main/java/org/apache/commons/lang3/builder/CompareToBuilder.java b/src/main/java/org/apache/commons/lang3/builder/CompareToBuilder.java
index 6acf01a8a88..483aa37cd9c 100644
--- a/src/main/java/org/apache/commons/lang3/builder/CompareToBuilder.java
+++ b/src/main/java/org/apache/commons/lang3/builder/CompareToBuilder.java
@@ -19,7 +19,6 @@
 import java.lang.reflect.AccessibleObject;
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
-import java.time.temporal.Temporal;
 import java.util.Collection;
 import java.util.Comparator;
 import java.util.Objects;
@@ -116,7 +115,7 @@ private static void reflectionAppend(
         final boolean useTransients,
         final String[] excludeFields) {
 
-        if ((lhs instanceof CharSequence || lhs instanceof Number || lhs instanceof Temporal) && lhs instanceof Comparable) {
+        if (Reflection.isJavaInternalClass(lhs) && lhs instanceof Comparable) {
             builder.append(lhs, rhs);
             return;
         }
diff --git a/src/main/java/org/apache/commons/lang3/builder/EqualsBuilder.java b/src/main/java/org/apache/commons/lang3/builder/EqualsBuilder.java
index 67183a2855e..0fbfd98cb08 100644
--- a/src/main/java/org/apache/commons/lang3/builder/EqualsBuilder.java
+++ b/src/main/java/org/apache/commons/lang3/builder/EqualsBuilder.java
@@ -19,7 +19,6 @@
 import java.lang.reflect.AccessibleObject;
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
-import java.time.temporal.Temporal;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashSet;
@@ -732,8 +731,7 @@ public EqualsBuilder append(final Object lhs, final Object rhs) {
             // to be inlined
             appendArray(lhs, rhs);
         } else // The simple case, not an array, just test the element
-        if (testRecursive && !ClassUtils.isPrimitiveOrWrapper(lhsClass)
-                && !(CharSequence.class.isAssignableFrom(lhsClass) || Number.class.isAssignableFrom(lhsClass) || Temporal.class.isAssignableFrom(lhsClass))) {
+        if (testRecursive && !ClassUtils.isPrimitiveOrWrapper(lhsClass) && !Reflection.isJavaInternalClass(lhsClass)) {
             reflectionAppend(lhs, rhs);
         } else {
             isEquals = lhs.equals(rhs);
@@ -958,8 +956,7 @@ public EqualsBuilder reflectionAppend(final Object lhs, final Object rhs) {
         }
 
         try {
-            if (testClass.isArray() || Number.class.isAssignableFrom(testClass)
-                    || Temporal.class.isAssignableFrom(testClass) || CharSequence.class.isAssignableFrom(testClass)) {
+            if (testClass.isArray() || Reflection.isJavaInternalClass(testClass)) {
                 append(lhs, rhs);
             } else //If either class is being excluded, call normal object equals method on lhsClass.
             if (bypassReflectionClasses != null
diff --git a/src/main/java/org/apache/commons/lang3/builder/HashCodeBuilder.java b/src/main/java/org/apache/commons/lang3/builder/HashCodeBuilder.java
index 00d3b1c3144..a214b2ba7af 100644
--- a/src/main/java/org/apache/commons/lang3/builder/HashCodeBuilder.java
+++ b/src/main/java/org/apache/commons/lang3/builder/HashCodeBuilder.java
@@ -20,7 +20,6 @@
 import java.lang.reflect.AccessibleObject;
 import java.lang.reflect.Field;
 import java.lang.reflect.Modifier;
-import java.time.temporal.Temporal;
 import java.util.Collection;
 import java.util.Comparator;
 import java.util.HashSet;
@@ -181,7 +180,7 @@ private static void reflectionAppend(final Object object, final Class<?> clazz,
         if (isRegistered(object)) {
             return;
         }
-        if (object instanceof CharSequence || object instanceof Number || object instanceof Temporal) {
+        if (Reflection.isJavaInternalClass(object)) {
             builder.append(object);
             return;
         }
diff --git a/src/main/java/org/apache/commons/lang3/builder/Reflection.java b/src/main/java/org/apache/commons/lang3/builder/Reflection.java
index fe7ade599a5..1d7f140dcb3 100644
--- a/src/main/java/org/apache/commons/lang3/builder/Reflection.java
+++ b/src/main/java/org/apache/commons/lang3/builder/Reflection.java
@@ -18,6 +18,7 @@
 package org.apache.commons.lang3.builder;
 
 import java.lang.reflect.Field;
+import java.time.temporal.Temporal;
 import java.util.Objects;
 
 /**
@@ -41,4 +42,24 @@ static Object getUnchecked(final Field field, final Object obj) {
         }
     }
 
+    /**
+     * Check whether the given object is of a type which is an internal java Class, like String, Integer, Boolean, LocalDateTime, etc
+     * This is often needed as we cannot look into them via reflection since Java9.
+     *
+     * @return {@code true} if the given object is a Java internal class
+     */
+    static boolean isJavaInternalClass(Object o) {
+        return o != null && isJavaInternalClass(o.getClass());
+    }
+
+    /**
+     * Check whether the given class is an internal java Class, like String, Integer, Boolean, LocalDateTime, etc
+     * This is often needed as we cannot look into them via reflection since Java9.
+     *
+     * @return {@code true} if the given class is a Java internal class
+     */
+    static boolean isJavaInternalClass(Class<?> clazz) {
+        return CharSequence.class.isAssignableFrom(clazz) || Number.class.isAssignableFrom(clazz) || Boolean.class.isAssignableFrom(clazz) || Temporal.class.isAssignableFrom(clazz);
+    }
+
 }