diff --git a/core/src/main/java/org/apache/struts2/factory/PrefixBasedActionProxyFactory.java b/core/src/main/java/org/apache/struts2/factory/PrefixBasedActionProxyFactory.java
index cf196a9b2..03052ec6a 100644
--- a/core/src/main/java/org/apache/struts2/factory/PrefixBasedActionProxyFactory.java
+++ b/core/src/main/java/org/apache/struts2/factory/PrefixBasedActionProxyFactory.java
@@ -59,11 +59,12 @@ import java.util.Set;
  * </pre>
  * <!-- END SNIPPET: description -->
  */
-public class PrefixBasedActionProxyFactory extends StrutsActionProxyFactory {
+public class PrefixBasedActionProxyFactory extends StrutsActionProxyFactory implements Initializable {
 
     private static final Logger LOG = LogManager.getLogger(PrefixBasedActionProxyFactory.class);
 
     private Map<String, ActionProxyFactory> actionProxyFactories = new HashMap<>();
+    private Set<String> prefixes = new HashSet<>();
 
     @Inject
     public void setContainer(Container container) {
@@ -73,18 +74,22 @@ public class PrefixBasedActionProxyFactory extends StrutsActionProxyFactory {
     @Inject(StrutsConstants.PREFIX_BASED_MAPPER_CONFIGURATION)
     public void setPrefixBasedActionProxyFactories(String list) {
         if (list != null) {
-            Set<String> prefixes = new HashSet<>(Arrays.asList(list.split(",")));
-            for (String factory : prefixes) {
-                String[] thisFactory = factory.split(":");
-                if (thisFactory.length == 2) {
-                    String factoryPrefix = thisFactory[0].trim();
-                    String factoryName = thisFactory[1].trim();
-                    ActionProxyFactory obj = container.getInstance(ActionProxyFactory.class, factoryName);
-                    if (obj != null) {
-                        actionProxyFactories.put(factoryPrefix, obj);
-                    } else {
-                        LOG.warn("Invalid PrefixBasedActionProxyFactory config entry: [{}]", factory);
-                    }
+            prefixes = new HashSet<>(Arrays.asList(list.split(",")));
+        }
+    }
+
+    @Override
+    public void init() {
+        for (String factory : prefixes) {
+            String[] thisFactory = factory.split(":");
+            if (thisFactory.length == 2) {
+                String factoryPrefix = thisFactory[0].trim();
+                String factoryName = thisFactory[1].trim();
+                ActionProxyFactory obj = container.getInstance(ActionProxyFactory.class, factoryName);
+                if (obj != null) {
+                    actionProxyFactories.put(factoryPrefix, obj);
+                } else {
+                    LOG.warn("Invalid PrefixBasedActionProxyFactory config entry: [{}]", factory);
                 }
             }
         }
diff --git a/core/src/test/java/org/apache/struts2/factory/PrefixBasedActionProxyFactoryTest.java b/core/src/test/java/org/apache/struts2/factory/PrefixBasedActionProxyFactoryTest.java
index 27e9d019c..109a61fec 100644
--- a/core/src/test/java/org/apache/struts2/factory/PrefixBasedActionProxyFactoryTest.java
+++ b/core/src/test/java/org/apache/struts2/factory/PrefixBasedActionProxyFactoryTest.java
@@ -41,7 +41,7 @@ public class PrefixBasedActionProxyFactoryTest extends StrutsInternalTestCase {
     private PrefixBasedActionProxyFactory factory;
 
     public void testDifferentPrefixes() throws Exception {
-        factory.setPrefixBasedActionProxyFactories("/ns1:prefix1,/ns2:prefix2");
+        initFactory("/ns1:prefix1,/ns2:prefix2");
 
         ActionProxy proxy1 = factory.createActionProxy("/ns1", "", "", Collections.<String, Object>emptyMap(), false, true);
         assertTrue(proxy1 instanceof Prefix1ActionProxy);
@@ -51,7 +51,7 @@ public class PrefixBasedActionProxyFactoryTest extends StrutsInternalTestCase {
     }
 
     public void testFallbackToDefault() throws Exception {
-        factory.setPrefixBasedActionProxyFactories("/ns1:prefix1");
+        initFactory("/ns1:prefix1");
 
         ActionProxy proxy1 = factory.createActionProxy("/ns1", "", "", Collections.<String, Object>emptyMap(), false, true);
         assertTrue(proxy1 instanceof Prefix1ActionProxy);
@@ -61,7 +61,7 @@ public class PrefixBasedActionProxyFactoryTest extends StrutsInternalTestCase {
     }
 
     public void testEmptyPrefix() throws Exception {
-        factory.setPrefixBasedActionProxyFactories(":prefix1");
+        initFactory(":prefix1");
 
         ActionProxy proxy1 = factory.createActionProxy("/ns1", "", "", Collections.<String, Object>emptyMap(), false, true);
         assertTrue(proxy1 instanceof Prefix1ActionProxy);
@@ -81,7 +81,9 @@ public class PrefixBasedActionProxyFactoryTest extends StrutsInternalTestCase {
                             public Object create(Context context) throws Exception {
                                 return new Prefix1Factory();
                             }
-
+                            public Class type() {
+                                return Prefix1Factory.class;
+                            }
                         }, Scope.SINGLETON);
                     }
                 },
@@ -92,7 +94,9 @@ public class PrefixBasedActionProxyFactoryTest extends StrutsInternalTestCase {
                             public Object create(Context context) throws Exception {
                                 return new Prefix2Factory();
                             }
-
+                            public Class type() {
+                                return Prefix2Factory.class;
+                            }
                         }, Scope.SINGLETON);
                     }
                 }
@@ -104,6 +108,11 @@ public class PrefixBasedActionProxyFactoryTest extends StrutsInternalTestCase {
         factory.setContainer(container);
     }
 
+    void initFactory(String list) {
+        factory.setPrefixBasedActionProxyFactories(list);
+        factory.init();
+    }
+
     @Override
     public void tearDown() throws Exception {
         super.tearDown();