diff --git a/adapters/jetty/src/main/java/org/acegisecurity/adapters/jetty/JettyAcegiUserToken.java b/adapters/jetty/src/main/java/org/acegisecurity/adapters/jetty/JettyAcegiUserToken.java
index a8c3660819..ff7a297081 100644
--- a/adapters/jetty/src/main/java/org/acegisecurity/adapters/jetty/JettyAcegiUserToken.java
+++ b/adapters/jetty/src/main/java/org/acegisecurity/adapters/jetty/JettyAcegiUserToken.java
@@ -44,7 +44,7 @@ public class JettyAcegiUserToken extends AbstractAdapterAuthenticationToken
     }
 
     protected JettyAcegiUserToken() {
-        super();
+        throw new IllegalArgumentException("Cannot use default constructor");
     }
 
     //~ Methods ================================================================
diff --git a/core/src/main/java/org/acegisecurity/GrantedAuthorityImpl.java b/core/src/main/java/org/acegisecurity/GrantedAuthorityImpl.java
index a1d094dcb7..7629cb3a40 100644
--- a/core/src/main/java/org/acegisecurity/GrantedAuthorityImpl.java
+++ b/core/src/main/java/org/acegisecurity/GrantedAuthorityImpl.java
@@ -38,8 +38,8 @@ public class GrantedAuthorityImpl implements GrantedAuthority {
         this.role = role;
     }
 
-    private GrantedAuthorityImpl() {
-        super();
+    protected GrantedAuthorityImpl() {
+        throw new IllegalArgumentException("Cannot use default constructor");
     }
 
     //~ Methods ================================================================
diff --git a/core/src/main/java/org/acegisecurity/SecurityConfig.java b/core/src/main/java/org/acegisecurity/SecurityConfig.java
index a43290dd62..e289c09de3 100644
--- a/core/src/main/java/org/acegisecurity/SecurityConfig.java
+++ b/core/src/main/java/org/acegisecurity/SecurityConfig.java
@@ -32,8 +32,8 @@ public class SecurityConfig implements ConfigAttribute {
         this.attrib = config;
     }
 
-    private SecurityConfig() {
-        super();
+    protected SecurityConfig() {
+        throw new IllegalArgumentException("Cannot use default constructor");
     }
 
     //~ Methods ================================================================
diff --git a/core/src/main/java/org/acegisecurity/adapters/PrincipalAcegiUserToken.java b/core/src/main/java/org/acegisecurity/adapters/PrincipalAcegiUserToken.java
index 3100c62a3b..39ecf3fa9f 100644
--- a/core/src/main/java/org/acegisecurity/adapters/PrincipalAcegiUserToken.java
+++ b/core/src/main/java/org/acegisecurity/adapters/PrincipalAcegiUserToken.java
@@ -44,7 +44,7 @@ public class PrincipalAcegiUserToken extends AbstractAdapterAuthenticationToken
     }
 
     protected PrincipalAcegiUserToken() {
-        super();
+        throw new IllegalArgumentException("Cannot use default constructor");
     }
 
     //~ Methods ================================================================
diff --git a/core/src/main/java/org/acegisecurity/runas/RunAsUserToken.java b/core/src/main/java/org/acegisecurity/runas/RunAsUserToken.java
index cc42a93d5f..e68f37848a 100644
--- a/core/src/main/java/org/acegisecurity/runas/RunAsUserToken.java
+++ b/core/src/main/java/org/acegisecurity/runas/RunAsUserToken.java
@@ -47,8 +47,8 @@ public class RunAsUserToken extends AbstractAuthenticationToken {
         this.originalAuthentication = originalAuthentication;
     }
 
-    private RunAsUserToken() {
-        super();
+    protected RunAsUserToken() {
+        throw new IllegalArgumentException("Cannot use default constructor");
     }
 
     //~ Methods ================================================================