Jruby rails application on Tomcat. War generated through warbler - ruby-on-rails

Question

I am using warbler to create war of my Jruby application. It creates a war without any problem, but when I deploy it in tomcat (webapps) it gives me following exception:
SEVERE: Parse error in application web.xml file at jndi:/localhost/POC_Rails_1_3_1_/WEB-INF/web.xml
org.xml.sax.SAXParseException: Comment must start with "<!--".
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1231)
Generated (WEB-INF/web.xml) is below. Let me know if I have forgotten to configure something.
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<context-param>
<param-name>public.root</param-name>
<param-value>/</param-value>
</context-param>
<context-param>
<param-name>rails.env</param-name>
<param-value>developement</param-value>
</context-param>
<filter>
<filter-name>RackFilter</filter-name>
<filter-class>org.jruby.rack.RackFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>RackFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<listener>
<listener-class>org.jruby.rack.rails.RailsServletContextListener</listener-class>
</listener>
</web-app>
<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd">
<web-app>
<context-param>
<param-name>public.root</param-name>
<param-value>/</param-value>
</context-param>
<context-param>
<param-name>rails.env</param-name>
<param-value>developement</param-value>
</context-param>
<filter>
<filter-name>RackFilter</filter-name>
<filter-class>org.jruby.rack.RackFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>RackFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
<listener>
<listener-class>org.jruby.rack.rails.RailsServletContextListener</listener-class>
</listener>
</web-app>

Answer 1

As the first commentor mentioned the xml is invalid because of duplicate <web-app> and <!DOCTYPE. The parser error is related to <!. <! is meant for declaring documenttype and it can appear only before the start of the root element. Any subsequent appearances will be treated as start of a comment. And the comment needs -- after <!