diff --git a/core/src/main/java/org/acegisecurity/SecurityConfig.java b/core/src/main/java/org/acegisecurity/SecurityConfig.java
index 7b1a8158fb..e792ce717a 100644
--- a/core/src/main/java/org/acegisecurity/SecurityConfig.java
+++ b/core/src/main/java/org/acegisecurity/SecurityConfig.java
@@ -32,10 +32,6 @@ public class SecurityConfig implements ConfigAttribute {
         this.attrib = config;
     }
 
-    protected SecurityConfig() {
-        throw new IllegalArgumentException("Cannot use default constructor");
-    }
-
     //~ Methods ================================================================
 
     public String getAttribute() {
diff --git a/core/src/main/java/org/acegisecurity/acl/basic/NamedEntityObjectIdentity.java b/core/src/main/java/org/acegisecurity/acl/basic/NamedEntityObjectIdentity.java
index 5b2e96756e..c14e81847e 100644
--- a/core/src/main/java/org/acegisecurity/acl/basic/NamedEntityObjectIdentity.java
+++ b/core/src/main/java/org/acegisecurity/acl/basic/NamedEntityObjectIdentity.java
@@ -46,10 +46,6 @@ public class NamedEntityObjectIdentity implements AclObjectIdentity {
         this.id = id;
     }
 
-    protected NamedEntityObjectIdentity() {
-        throw new IllegalArgumentException("Cannot use default constructor");
-    }
-
     /**
      * Creates the <code>NamedEntityObjectIdentity</code> based on the passed
      * object instance. The passed object must provide a <code>getId()</code>
diff --git a/core/src/main/java/org/acegisecurity/adapters/PrincipalAcegiUserToken.java b/core/src/main/java/org/acegisecurity/adapters/PrincipalAcegiUserToken.java
index 1af70f4a3e..1b27551f4f 100644
--- a/core/src/main/java/org/acegisecurity/adapters/PrincipalAcegiUserToken.java
+++ b/core/src/main/java/org/acegisecurity/adapters/PrincipalAcegiUserToken.java
@@ -45,10 +45,6 @@ public class PrincipalAcegiUserToken extends AbstractAdapterAuthenticationToken
         this.principal = principal;
     }
 
-    protected PrincipalAcegiUserToken() {
-        throw new IllegalArgumentException("Cannot use default constructor");
-    }
-
     //~ Methods ================================================================
 
     public Object getCredentials() {
diff --git a/core/src/main/java/org/acegisecurity/intercept/InterceptorStatusToken.java b/core/src/main/java/org/acegisecurity/intercept/InterceptorStatusToken.java
index 23f82a7e21..299cc74ace 100644
--- a/core/src/main/java/org/acegisecurity/intercept/InterceptorStatusToken.java
+++ b/core/src/main/java/org/acegisecurity/intercept/InterceptorStatusToken.java
@@ -51,10 +51,6 @@ public class InterceptorStatusToken {
         this.secureObject = secureObject;
     }
 
-    protected InterceptorStatusToken() {
-        throw new IllegalArgumentException("Cannot use default constructor");
-    }
-
     //~ Methods ================================================================
 
     public ConfigAttributeDefinition getAttr() {
diff --git a/core/src/main/java/org/acegisecurity/intercept/web/FilterInvocation.java b/core/src/main/java/org/acegisecurity/intercept/web/FilterInvocation.java
index 8b059756b7..e88af85bd5 100644
--- a/core/src/main/java/org/acegisecurity/intercept/web/FilterInvocation.java
+++ b/core/src/main/java/org/acegisecurity/intercept/web/FilterInvocation.java
@@ -71,10 +71,6 @@ public class FilterInvocation {
         this.chain = chain;
     }
 
-    protected FilterInvocation() {
-        throw new IllegalArgumentException("Cannot use default constructor");
-    }
-
     //~ Methods ================================================================
 
     public FilterChain getChain() {
diff --git a/core/src/main/java/org/acegisecurity/providers/cas/TicketResponse.java b/core/src/main/java/org/acegisecurity/providers/cas/TicketResponse.java
index dbf6673ad9..4673290479 100644
--- a/core/src/main/java/org/acegisecurity/providers/cas/TicketResponse.java
+++ b/core/src/main/java/org/acegisecurity/providers/cas/TicketResponse.java
@@ -72,10 +72,6 @@ public class TicketResponse {
         this.proxyGrantingTicketIou = proxyGrantingTicketIou;
     }
 
-    protected TicketResponse() {
-        throw new IllegalArgumentException("Cannot use default constructor");
-    }
-
     //~ Methods ================================================================
 
     public String getProxyGrantingTicketIou() {
diff --git a/core/src/main/java/org/acegisecurity/userdetails/User.java b/core/src/main/java/org/acegisecurity/userdetails/User.java
index a61326deda..0ca42645a9 100644
--- a/core/src/main/java/org/acegisecurity/userdetails/User.java
+++ b/core/src/main/java/org/acegisecurity/userdetails/User.java
@@ -35,8 +35,6 @@ import org.springframework.util.Assert;
 public class User implements UserDetails {
     //~ Instance fields ========================================================
 
-    // ~ Instance fields
-    // ========================================================
     private String password;
     private String username;
     private GrantedAuthority[] authorities;
@@ -47,12 +45,6 @@ public class User implements UserDetails {
 
     //~ Constructors ===========================================================
 
-    // ~ Constructors
-    // ===========================================================
-    protected User() {
-        throw new IllegalArgumentException("Cannot use default constructor");
-    }
-
     /**
      * Construct the <code>User</code> with the details required by {@link
      * DaoAuthenticationProvider}.
@@ -192,8 +184,6 @@ public class User implements UserDetails {
         return username;
     }
 
-    // ~ Methods
-    // ================================================================
     public int hashCode() {
         int code = 9792;
 
@@ -260,13 +250,13 @@ public class User implements UserDetails {
 
     public String toString() {
         StringBuffer sb = new StringBuffer();
-        sb.append(super.toString() + ": ");
-        sb.append("Username: " + this.username + "; ");
+        sb.append(super.toString()).append(": ");
+        sb.append("Username: ").append(this.username).append("; ");
         sb.append("Password: [PROTECTED]; ");
-        sb.append("Enabled: " + this.enabled + "; ");
-        sb.append("AccountNonExpired: " + this.accountNonExpired + "; ");
-        sb.append("credentialsNonExpired: " + this.credentialsNonExpired + "; ");
-        sb.append("AccountNonLocked: " + this.accountNonLocked + "; ");
+        sb.append("Enabled: ").append(this.enabled).append("; ");
+        sb.append("AccountNonExpired: ").append(this.accountNonExpired).append("; ");
+        sb.append("credentialsNonExpired: ").append(this.credentialsNonExpired).append("; ");
+        sb.append("AccountNonLocked: ").append(this.accountNonLocked).append("; ");
 
         if (this.getAuthorities() != null) {
             sb.append("Granted Authorities: ");
diff --git a/core/src/test/java/org/acegisecurity/SecurityConfigTests.java b/core/src/test/java/org/acegisecurity/SecurityConfigTests.java
index 6b50abc56e..b5136a470b 100644
--- a/core/src/test/java/org/acegisecurity/SecurityConfigTests.java
+++ b/core/src/test/java/org/acegisecurity/SecurityConfigTests.java
@@ -49,12 +49,14 @@ public class SecurityConfigTests extends TestCase {
         SecurityConfig config = new SecurityConfig("TEST");
         assertEquals("TEST".hashCode(), config.hashCode());
     }
+   
+    public void testNoArgConstructorDoesntExist() {
+        Class clazz = SecurityConfig.class;
 
-    public void testNoArgsConstructor() {
         try {
-            new SecurityConfig();
-            fail("Should have thrown IllegalArgumentException");
-        } catch (IllegalArgumentException expected) {
+            clazz.getDeclaredConstructor((Class[])null);
+            fail("Should have thrown NoSuchMethodException");
+        } catch (NoSuchMethodException expected) {
             assertTrue(true);
         }
     }
diff --git a/core/src/test/java/org/acegisecurity/acl/basic/NamedEntityObjectIdentityTests.java b/core/src/test/java/org/acegisecurity/acl/basic/NamedEntityObjectIdentityTests.java
index 81107ff14d..7facc8dcef 100644
--- a/core/src/test/java/org/acegisecurity/acl/basic/NamedEntityObjectIdentityTests.java
+++ b/core/src/test/java/org/acegisecurity/acl/basic/NamedEntityObjectIdentityTests.java
@@ -75,11 +75,13 @@ public class NamedEntityObjectIdentityTests extends TestCase {
         }
     }
 
-    public void testDefaultConstructorRejected() {
+    public void testNoArgConstructorDoesntExist() {
+        Class clazz = NamedEntityObjectIdentity.class;
+
         try {
-            new NamedEntityObjectIdentity();
-            fail("Should have thrown IllegalArgumentException");
-        } catch (IllegalArgumentException expected) {
+            clazz.getDeclaredConstructor((Class[])null);
+            fail("Should have thrown NoSuchMethodException");
+        } catch (NoSuchMethodException expected) {
             assertTrue(true);
         }
     }
diff --git a/core/src/test/java/org/acegisecurity/adapters/AbstractAdapterAuthenticationTokenTests.java b/core/src/test/java/org/acegisecurity/adapters/AbstractAdapterAuthenticationTokenTests.java
index 7f4da5871d..c42d4cd8a6 100644
--- a/core/src/test/java/org/acegisecurity/adapters/AbstractAdapterAuthenticationTokenTests.java
+++ b/core/src/test/java/org/acegisecurity/adapters/AbstractAdapterAuthenticationTokenTests.java
@@ -71,15 +71,6 @@ public class AbstractAdapterAuthenticationTokenTests extends TestCase {
         assertTrue(!token.isUserInRole("ROLE_XXXX"));
     }
 
-    public void testNoArgsConstructor() {
-        try {
-            new MockDecisionManagerImpl();
-            fail("Should have thrown IllegalArgumentException");
-        } catch (IllegalArgumentException expected) {
-            assertTrue(true);
-        }
-    }
-
     public void testObjectsEquals() throws Exception {
         MockDecisionManagerImpl token1 = new MockDecisionManagerImpl("my_password",
                 "Test", "Password",
@@ -148,10 +139,6 @@ public class AbstractAdapterAuthenticationTokenTests extends TestCase {
             this.password = password;
         }
 
-        private MockDecisionManagerImpl() {
-            throw new IllegalArgumentException();
-        }
-
         public Object getCredentials() {
             return this.password;
         }
diff --git a/core/src/test/java/org/acegisecurity/adapters/PrincipalAcegiUserTokenTests.java b/core/src/test/java/org/acegisecurity/adapters/PrincipalAcegiUserTokenTests.java
index 5793015ee5..4d8e775ca6 100644
--- a/core/src/test/java/org/acegisecurity/adapters/PrincipalAcegiUserTokenTests.java
+++ b/core/src/test/java/org/acegisecurity/adapters/PrincipalAcegiUserTokenTests.java
@@ -59,12 +59,14 @@ public class PrincipalAcegiUserTokenTests extends TestCase {
         assertEquals("Test", token.getName());
     }
 
-    public void testNoArgsConstructor() {
+    public void testNoArgConstructorDoesntExist() {
+        Class clazz = PrincipalAcegiUserToken.class;
+
         try {
-            new PrincipalAcegiUserToken();
-            fail("Should have thrown IllegalArgumentException");
-        } catch (IllegalArgumentException expected) {
+            clazz.getDeclaredConstructor((Class[])null);
+            fail("Should have thrown NoSuchMethodException");
+        } catch (NoSuchMethodException expected) {
             assertTrue(true);
         }
-    }
+    }    
 }
diff --git a/core/src/test/java/org/acegisecurity/intercept/InterceptorStatusTokenTests.java b/core/src/test/java/org/acegisecurity/intercept/InterceptorStatusTokenTests.java
index b4c3d1bf25..757def63df 100644
--- a/core/src/test/java/org/acegisecurity/intercept/InterceptorStatusTokenTests.java
+++ b/core/src/test/java/org/acegisecurity/intercept/InterceptorStatusTokenTests.java
@@ -48,11 +48,13 @@ public class InterceptorStatusTokenTests extends TestCase {
         junit.textui.TestRunner.run(InterceptorStatusTokenTests.class);
     }
 
-    public void testDefaultConstructor() {
+    public void testNoArgConstructorDoesntExist() {
+        Class clazz = InterceptorStatusToken.class;
+
         try {
-            new InterceptorStatusToken();
-            fail("Should have thrown IllegalArgumentException");
-        } catch (IllegalArgumentException expected) {
+            clazz.getDeclaredConstructor((Class[])null);
+            fail("Should have thrown NoSuchMethodException");
+        } catch (NoSuchMethodException expected) {
             assertTrue(true);
         }
     }
diff --git a/core/src/test/java/org/acegisecurity/intercept/web/FilterInvocationDefinitionSourceEditorTests.java b/core/src/test/java/org/acegisecurity/intercept/web/FilterInvocationDefinitionSourceEditorTests.java
index de0ab2d2dc..f0d1402747 100644
--- a/core/src/test/java/org/acegisecurity/intercept/web/FilterInvocationDefinitionSourceEditorTests.java
+++ b/core/src/test/java/org/acegisecurity/intercept/web/FilterInvocationDefinitionSourceEditorTests.java
@@ -154,11 +154,13 @@ public class FilterInvocationDefinitionSourceEditorTests extends TestCase {
         assertEquals(2, map.getMapSize());
     }
 
-    public void testNoArgsConstructor() {
+    public void testNoArgConstructorDoesntExist() {
+        Class clazz = RegExpBasedFilterInvocationDefinitionMap.EntryHolder.class;
+
         try {
-            new RegExpBasedFilterInvocationDefinitionMap().new EntryHolder();
-            fail("Should have thrown IllegalArgumentException");
-        } catch (IllegalArgumentException expected) {
+            clazz.getDeclaredConstructor((Class[])null);
+            fail("Should have thrown NoSuchMethodException");
+        } catch (NoSuchMethodException expected) {
             assertTrue(true);
         }
     }
diff --git a/core/src/test/java/org/acegisecurity/intercept/web/FilterInvocationDefinitionSourceEditorWithPathsTests.java b/core/src/test/java/org/acegisecurity/intercept/web/FilterInvocationDefinitionSourceEditorWithPathsTests.java
index 5766b86b58..1354fbf39a 100644
--- a/core/src/test/java/org/acegisecurity/intercept/web/FilterInvocationDefinitionSourceEditorWithPathsTests.java
+++ b/core/src/test/java/org/acegisecurity/intercept/web/FilterInvocationDefinitionSourceEditorWithPathsTests.java
@@ -135,11 +135,13 @@ public class FilterInvocationDefinitionSourceEditorWithPathsTests
         assertEquals(2, map.getMapSize());
     }
 
-    public void testNoArgsConstructor() {
+    public void testNoArgConstructorDoesntExist() {
+        Class clazz = PathBasedFilterInvocationDefinitionMap.EntryHolder.class;
+
         try {
-            new PathBasedFilterInvocationDefinitionMap().new EntryHolder();
-            fail("Should have thrown IllegalArgumentException");
-        } catch (IllegalArgumentException expected) {
+            clazz.getDeclaredConstructor((Class[])null);
+            fail("Should have thrown NoSuchMethodException");
+        } catch (NoSuchMethodException expected) {
             assertTrue(true);
         }
     }
diff --git a/core/src/test/java/org/acegisecurity/intercept/web/FilterInvocationTests.java b/core/src/test/java/org/acegisecurity/intercept/web/FilterInvocationTests.java
index d678a99a42..3ca684888c 100644
--- a/core/src/test/java/org/acegisecurity/intercept/web/FilterInvocationTests.java
+++ b/core/src/test/java/org/acegisecurity/intercept/web/FilterInvocationTests.java
@@ -77,11 +77,13 @@ public class FilterInvocationTests extends MockObjectTestCase {
             fi.getFullRequestUrl());
     }
 
-    public void testNoArgsConstructor() {
+    public void testNoArgConstructorDoesntExist() {
+        Class clazz = FilterInvocation.class;
+
         try {
-            new FilterInvocation();
-            fail("Should have thrown IllegalArgumentException");
-        } catch (IllegalArgumentException expected) {
+            clazz.getDeclaredConstructor((Class[])null);
+            fail("Should have thrown NoSuchMethodException");
+        } catch (NoSuchMethodException expected) {
             assertTrue(true);
         }
     }
diff --git a/core/src/test/java/org/acegisecurity/providers/cas/TicketResponseTests.java b/core/src/test/java/org/acegisecurity/providers/cas/TicketResponseTests.java
index f7a9a49a43..dfca3bbd1b 100644
--- a/core/src/test/java/org/acegisecurity/providers/cas/TicketResponseTests.java
+++ b/core/src/test/java/org/acegisecurity/providers/cas/TicketResponseTests.java
@@ -82,11 +82,13 @@ public class TicketResponseTests extends TestCase {
             ticket.getProxyGrantingTicketIou());
     }
 
-    public void testNoArgConstructor() {
+    public void testNoArgConstructorDoesntExist() {
+        Class clazz = TicketResponse.class;
+
         try {
-            new TicketResponse();
-            fail("Should have thrown IllegalArgumentException");
-        } catch (IllegalArgumentException expected) {
+            clazz.getDeclaredConstructor((Class[])null);
+            fail("Should have thrown NoSuchMethodException");
+        } catch (NoSuchMethodException expected) {
             assertTrue(true);
         }
     }
diff --git a/core/src/test/java/org/acegisecurity/userdetails/UserTests.java b/core/src/test/java/org/acegisecurity/userdetails/UserTests.java
index 32c5740244..5f268bd1fe 100644
--- a/core/src/test/java/org/acegisecurity/userdetails/UserTests.java
+++ b/core/src/test/java/org/acegisecurity/userdetails/UserTests.java
@@ -101,11 +101,13 @@ public class UserTests extends TestCase {
                     new GrantedAuthority[] {new GrantedAuthorityImpl("ROLE_ONE")})));
     }
 
-    public void testNoArgConstructor() {
+    public void testNoArgConstructorDoesntExist() {
+        Class clazz = User.class;
+
         try {
-            new User();
-            fail("Should have thrown IllegalArgumentException");
-        } catch (IllegalArgumentException expected) {
+            clazz.getDeclaredConstructor((Class[])null);
+            fail("Should have thrown NoSuchMethodException");
+        } catch (NoSuchMethodException expected) {
             assertTrue(true);
         }
     }