title: Different servlet-api versions collision
body: <p>I'm developing RestEasy web services using Maven and Jetty as the server. One of the services should use Filter that extends javax.servlet.http.HttpServletResponseWrapper. The problem is in method setCharacterEncoding of the interface javax.servlet.ServletResponse which comes from servlet-api 2.3. I'm getting the following exception</p>
  
  <pre><code>java.lang.NoSuchMethodError: com.webapp.rest.jsonp.HttpServletResponseContentWrapper.setCharacterEncoding(Ljava/lang/String;)V
  </code></pre>
  
  <p>I've speficied servlet-api 2.4 dependency as this, but also tried with 2.5:</p>
  
  <pre><code> &lt;web-app id="WebApp_ID" version="2.4"
  xmlns="http://java.sun.com/xml/ns/j2ee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
  http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"&gt;
  </code></pre>
  
  <p>Servlet-api 2.4 is specified like this:</p>
  
  <pre><code> &lt;dependency&gt;
  &lt;groupId&gt;javax.servlet&lt;/groupId&gt;
  &lt;artifactId&gt;servlet-api&lt;/artifactId&gt;
  &lt;version&gt;2.4&lt;/version&gt;
      &lt;scope&gt;provided&lt;/scope&gt;
   &lt;/dependency&gt;
  </code></pre>
  
  <p>I'm using Maven jetty plugin:</p>
  
  <pre><code> &lt;plugin&gt;
  &lt;groupId&gt;org.mortbay.jetty&lt;/groupId&gt;
  &lt;artifactId&gt;maven-jetty-plugin&lt;/artifactId&gt;
  &lt;version&gt;6.1.15&lt;/version&gt;
  &lt;configuration&gt;
   ....
   &lt;exclusions&gt;
  &lt;exclusion&gt;
  &lt;groupId&gt;javax.servlet&lt;/groupId&gt;
  &lt;artifactId&gt;servlet-api&lt;/artifactId&gt;
  &lt;/exclusion&gt;
  &lt;/exclusions&gt;
  </code></pre>
  
  <p>My RestEasy configuration:</p>
  
  <pre><code> &lt;dependency&gt;
  &lt;groupId&gt;org.jboss.resteasy&lt;/groupId&gt;
  &lt;artifactId&gt;resteasy-jettison-provider&lt;/artifactId&gt;
  &lt;version&gt;2.2.2.GA&lt;/version&gt;
  &lt;exclusions&gt;
      &lt;exclusion&gt;
      &lt;groupId&gt;javax.servlet&lt;/groupId&gt;
      &lt;artifactId&gt;servlet-api&lt;/artifactId&gt;
      &lt;/exclusion&gt;
  </code></pre>
  
  <p>However, in maven repository there are always both 2.3 and 2.4 (or 2.5) versions. I can't figure out if this 2.3 version comes with some other dependency. Is there any suggestion how could I find out this and how to enforce servlet-api 2.4 to be used.</p>
  
  <p>My dependency tree looks is as follow:</p>
  
  <pre><code>[INFO] [dependency:tree {execution: default-cli}]
  [INFO] com.inextweb.ai:inextweb-ai:war:1.0.0-SNAPSHOT
  [INFO] +- org.htmlparser:htmlparser:jar:2.1:compile
  [INFO] +- org.htmlparser:htmllexer:jar:2.1:compile
  [INFO] +- org.htmlparser:thumbelina:jar:2.1:compile
  [INFO] +- org.htmlparser:sitecapturer:jar:2.1:compile
  [INFO] +- org.htmlparser:filterbuilder:jar:2.1:compile
  [INFO] +- net.sf.jung:jung-api:jar:2.0.1:compile
  [INFO] |  \- net.sourceforge.collections:collections-generic:jar:4.01:compile
  [INFO] +- net.sf.jung:jung-algorithms:jar:2.0.1:compile
  [INFO] |  \- colt:colt:jar:1.2.0:compile
  [INFO] |     \- concurrent:concurrent:jar:1.3.4:compile
  [INFO] +- net.sf.jung:jung-graph-impl:jar:2.0.1:compile
  [INFO] +- net.sf.jung:jung-visualization:jar:2.0.1:compile
  [INFO] +- org.apache.opennlp:opennlp-tools:jar:1.5.2-incubating:compile
  [INFO] |  +- org.apache.opennlp:opennlp-maxent:jar:3.0.2-incubating:compile
  [INFO] |  \- jwnl:jwnl:jar:1.3.3:compile
  [INFO] +- net.sf.jwordnet:jwnl:jar:1.4_rc3:compile
  [INFO] +- javax.servlet:servlet-api:jar:2.5:provided
  [INFO] +- org.testng:testng:jar:6.1.1:test
  [INFO] |  +- org.beanshell:bsh:jar:2.0b4:test
  [INFO] |  +- com.beust:jcommander:jar:1.12:test
  [INFO] |  \- org.yaml:snakeyaml:jar:1.6:test
  [INFO] +- commons-pool:commons-pool:jar:1.6:compile
  [INFO] +- commons-codec:commons-codec:jar:1.7:compile
  [INFO] +- commons-lang:commons-lang:jar:2.6:compile
  [INFO] +- commons-logging:commons-logging:jar:1.1.1:compile
  [INFO] +- log4j:log4j:jar:1.2.16:compile
  [INFO] +- org.mongodb:mongo-java-driver:jar:2.10.1:compile
  [INFO] +- org.jboss.resteasy:resteasy-jaxrs:jar:2.3.5.Final:compile
  [INFO] |  +- org.jboss.resteasy:jaxrs-api:jar:2.3.5.Final:compile
  [INFO] |  +- org.scannotation:scannotation:jar:1.0.3:compile
  [INFO] |  |  \- javassist:javassist:jar:3.12.1.GA:compile
  [INFO] |  +- javax.annotation:jsr250-api:jar:1.0:compile
  [INFO] |  +- javax.activation:activation:jar:1.1:compile
  [INFO] |  +- org.apache.httpcomponents:httpclient:jar:4.1.2:compile
  [INFO] |  |  \- org.apache.httpcomponents:httpcore:jar:4.1.2:compile
  [INFO] |  \- net.jcip:jcip-annotations:jar:1.0:compile
  [INFO] +- org.jboss.resteasy:resteasy-jackson-provider:jar:2.2.2.GA:compile
  [INFO] |  +- org.codehaus.jackson:jackson-core-asl:jar:1.6.3:compile
  [INFO] |  +- org.codehaus.jackson:jackson-mapper-asl:jar:1.6.3:compile
  [INFO] |  +- org.codehaus.jackson:jackson-jaxrs:jar:1.6.3:compile
  [INFO] |  \- org.codehaus.jackson:jackson-xc:jar:1.6.3:compile
  [INFO] +- org.jboss.resteasy:resteasy-jettison-provider:jar:2.2.2.GA:compile
  [INFO] |  +- org.jboss.resteasy:resteasy-jaxb-provider:jar:2.2.2.GA:compile
  [INFO] |  |  \- com.sun.xml.stream:sjsxp:jar:1.0.1:compile
  [INFO] |  \- org.codehaus.jettison:jettison:jar:1.2:compile
  [INFO] +- org.simpleframework:simple-xml:jar:2.3.6:compile
  [INFO] |  +- stax:stax-api:jar:1.0.1:compile
  [INFO] |  \- stax:stax:jar:1.2.0:compile
  [INFO] +- dom4j:dom4j:jar:1.6.1:compile
  [INFO] |  \- xml-apis:xml-apis:jar:1.0.b2:compile
  [INFO] +- com.google.code.gson:gson:jar:2.2.2:system
  [INFO] +- junit:junit:jar:3.8.2:compile
  [INFO] +- xalan:serializer:jar:2.7.1:compile
  [INFO] +- bouncycastle:bcprov-jdk15:jar:140:compile
  [INFO] +- net.sf.json-lib:json-lib:jar:jdk15:2.4:compile
  [INFO] |  +- commons-beanutils:commons-beanutils:jar:1.8.0:compile
  [INFO] |  +- commons-collections:commons-collections:jar:3.2.1:compile
  [INFO] |  \- net.sf.ezmorph:ezmorph:jar:1.0.6:compile
  [INFO] +- commons-io:commons-io:jar:1.3.2:compile
  [INFO] +- xom:xom:jar:1.1:compile
  [INFO] |  +- xerces:xmlParserAPIs:jar:2.6.2:compile
  [INFO] |  +- xerces:xercesImpl:jar:2.6.2:compile
  [INFO] |  +- xalan:xalan:jar:2.7.0:compile
  [INFO] |  \- jaxen:jaxen:jar:1.1-beta-8:compile
  [INFO] |     \- jdom:jdom:jar:1.0:compile
  [INFO] +- org.slf4j:slf4j-api:jar:1.6.6:compile
  [INFO] +- org.slf4j:slf4j-log4j12:jar:1.6.6:compile
  [INFO] +- org.slf4j:jul-to-slf4j:jar:1.6.6:compile
  [INFO] \- org.slf4j:jcl-over-slf4j:jar:1.6.6:runtime
  [INFO] ------------------------------------------------------------------------
  </code></pre>
  
  <p>and here is the whole <a href="http://goo.gl/8uJ3W" rel="nofollow">pom.xml</a> and <a href="http://goo.gl/2CeQy" rel="nofollow">web.xml</a></p>
  
  <p>Thanks</p>