title: javax.servlet.HttpConstraintElement"'s signer information does not match signer information of other classes in the same package
body: <p>I've an exception in my maven project:</p>
  
  <p><em>class "javax.servlet.HttpConstraintElement"'s signer information does not match signer information of other classes in the same package</em></p>
  
  <p><em><strong>Question:</em></strong></p>
  
  <p><em>How to resolve this problem?</em></p>
  
  <p><em><strong>PS:</em></strong></p>
  
  <p>As I understand, I use two jars, both contains HttpConstraintElement. And those maven dependencies have two different versions. So I tried to:</p>
  
  <pre><code>$ mvn dependency:tree -Dverbose |grep servlet
  [INFO] +- javax.servlet:servlet-api:jar:2.5:compile
  [INFO] +- javax.servlet.jsp:jsp-api:jar:2.2:compile
  [INFO] +- javax.servlet:jstl:jar:1.2:compile
  [INFO] |  +- org.apache.tiles:tiles-servlet-wildcard:jar:2.2.2:compile
  [INFO] |  |  +- (org.apache.tiles:tiles-servlet:jar:2.2.2:compile - omitted for duplicate)
  [INFO] |  |  +- (org.apache.tiles:tiles-servlet:jar:2.2.2:compile - omitted for duplicate)
  [INFO] |  |  +- (org.apache.tiles:tiles-servlet:jar:2.2.2:compile - omitted for duplicate)
  [INFO] +- org.apache.tiles:tiles-servlet:jar:2.2.2:compile
  [INFO] |  +- (org.apache.tiles:tiles-servlet:jar:2.2.2:compile - omitted for duplicate)
  [INFO]    \- org.eclipse.jetty:jetty-servlet:jar:9.0.0.M4:compile
  [INFO]             +- org.eclipse.jetty.orbit:javax.servlet:jar:3.0.0.v201112011016:compile
  </code></pre>