gwt-user Jar not loaded offending class javax.servlet.Servlet

I have a war file (GWT app) which

•     works fine in UAT Env 1
•     works fine in Production environment
•     gives below error when deploying in UAT Env 2
•     the jar files ... servlet-api.jar , gwt-user.jar is located in same folder in all the environment
•     as per suggestion below tried deleting the gwt-user.jar from the folder , still same issue just the first line of error disappears

INFO: validateJarFile(/.../tomcat/webapps/abc-browser/WEB-INF/lib/gwt-user-1.7.0.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
Aug 21, 2013 2:35:46 PM org.apache.catalina.core.StandardContext start SEVERE: Error listenerStart
Aug 21, 2013 2:35:46 PM org.apache.catalina.core.StandardContext start SEVERE: Context [/abc-browser] startup failed due to previous errors

I have seen similar issues in this forum which advice
1) link 1 : to delete servlet-api.jar in tomcat\lib : i tried this doesnt help
2) link 2 : to change the pom.xml : but same war file ( hence pom ) is working fine in other environments ( esp prod )

Not sure if there is some more debug points , solution ?
Tried Solution 1 (failed) : manually deleting the gwt-user-1.7.0.jar from WEB-INF\lib of the web application , although still i get the message below
Aug 21, 2013 2:35:46 PM org.apache.catalina.core.StandardContext start SEVERE: Error listenerStart
Aug 21, 2013 2:35:46 PM org.apache.catalina.core.StandardContext start SEVERE: Context [/abc-browser] startup failed due to previous errors
i.e. 1st line doesn't come but still the app fails to load

Tried Solution 2 (failed) : From dependency tree i get below
[INFO] +- com.xyz.global.gxtfw:client:jar:2.0.0:compile
[INFO] |  \- com.xyz.global.gxtfw:common:jar:2.0.0:compile
[INFO] |     +- com.extjs:gxt:jar:2.0.1:compile
[INFO] |     \- com.google.gwt:gwt-user:jar:1.7.0:compile

I tried changing the scope of com.xyz.global.gxtfw to provided , doesnt help

Tried Solution 3 (failed) : add exclusion like below
<dependency>
    <groupId>com.xyz.global.gxtfw</groupId>
    <artifactId>client</artifactId>
    <version>2.0.0</version>
    <exclusions>
        <exclusion>
            <groupId>com.google.gwt</groupId>
            <artifactId>gwt-user</artifactId>
        </exclusion>
    </exclusions>

As per my understanding it may be some environment  specific (tomcat installation) issue ... (as same war file works fine in production & UAT1) ... NOT SURE WHAT THE ISSUE IS .. any help will be much appreciated ... more details at http://stackoverflow.com/questions/18362590/gwt-user-jar-not-loaded-offending-class-javax-servlet-servlet

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