diff --git a/cas-client-integration-jetty/src/main/java/org/jasig/cas/client/jetty/CasAuthentication.java b/cas-client-integration-jetty/src/main/java/org/jasig/cas/client/jetty/CasAuthentication.java
index 0b8fb2a..831ec75 100644
--- a/cas-client-integration-jetty/src/main/java/org/jasig/cas/client/jetty/CasAuthentication.java
+++ b/cas-client-integration-jetty/src/main/java/org/jasig/cas/client/jetty/CasAuthentication.java
@@ -1,6 +1,7 @@
 package org.jasig.cas.client.jetty;
 
 import org.eclipse.jetty.security.UserAuthentication;
+import org.jasig.cas.client.util.CommonUtils;
 import org.jasig.cas.client.validation.Assertion;
 
 /**
@@ -26,8 +27,8 @@ public class CasAuthentication extends UserAuthentication {
      */
     public CasAuthentication(final CasAuthenticator authenticator, final String ticket, final Assertion assertion) {
         super(authenticator.getAuthMethod(), new CasUserIdentity(assertion, authenticator.getRoleAttribute()));
-        assert ticket != null : "Ticket cannot be null";
-        assert authenticator != null : "CasAuthenticator cannot be null";
+        CommonUtils.assertNotNull(ticket, "Ticket cannot be null");
+        CommonUtils.assertNotNull(authenticator, "CasAuthenticator cannot be null");
         this.authenticator = authenticator;
         this.ticket = ticket;
     }
diff --git a/cas-client-integration-jetty/src/main/java/org/jasig/cas/client/jetty/CasAuthenticator.java b/cas-client-integration-jetty/src/main/java/org/jasig/cas/client/jetty/CasAuthenticator.java
index a9a3cfa..355e1d4 100644
--- a/cas-client-integration-jetty/src/main/java/org/jasig/cas/client/jetty/CasAuthenticator.java
+++ b/cas-client-integration-jetty/src/main/java/org/jasig/cas/client/jetty/CasAuthenticator.java
@@ -89,7 +89,7 @@ public class CasAuthenticator extends AbstractLifeCycle implements Authenticator
      * @param ticketValidator Ticket validator, MUST NOT be null.
      */
     public void setTicketValidator(final TicketValidator ticketValidator) {
-        assert ticketValidator != null : "TicketValidator cannot be null";
+        CommonUtils.assertNotNull(ticketValidator, "TicketValidator cannot be null");
         if (ticketValidator instanceof AbstractUrlBasedTicketValidator) {
             if (ticketValidator instanceof AbstractCasProtocolUrlBasedTicketValidator) {
                 protocol = Protocol.CAS2;
diff --git a/cas-client-integration-jetty/src/main/java/org/jasig/cas/client/jetty/CasUserIdentity.java b/cas-client-integration-jetty/src/main/java/org/jasig/cas/client/jetty/CasUserIdentity.java
index 200e626..aee4212 100644
--- a/cas-client-integration-jetty/src/main/java/org/jasig/cas/client/jetty/CasUserIdentity.java
+++ b/cas-client-integration-jetty/src/main/java/org/jasig/cas/client/jetty/CasUserIdentity.java
@@ -2,6 +2,7 @@ package org.jasig.cas.client.jetty;
 
 import org.eclipse.jetty.server.UserIdentity;
 import org.jasig.cas.client.authentication.AttributePrincipal;
+import org.jasig.cas.client.util.CommonUtils;
 import org.jasig.cas.client.validation.Assertion;
 
 import javax.security.auth.Subject;
@@ -29,7 +30,7 @@ public class CasUserIdentity implements UserIdentity {
      * @param roleAttribute Principal attribute containing role data.
      */
     public CasUserIdentity(final Assertion assertion, final String roleAttribute) {
-        assert assertion != null : "Assertion cannot be null";
+        CommonUtils.assertNotNull(assertion, "Assertion cannot be null");
         this.principal = assertion.getPrincipal();
         this.roleAttribute = roleAttribute;
     }