eclipse - java.lang.NoClassDefFoundError: javax/servlet/FilterRegistration -

i using spark 1.6.0 , trying code simple project of "word counts". getting error:

java.lang.noclassdeffounderror: javax/servlet/filterregistration

this code:

import org.apache.spark.api.java.javasparkcontext; import scala.tuple2;  import org.apache.spark.api.java.javapairrdd; import org.apache.spark.api.java.javardd;  import java.util.arrays;  import org.apache.spark.sparkconf;   public class wordcount { public static void main(string[] args) {     sparkconf conf = new sparkconf().setappname("wordcount").setmaster("local[2]");     javasparkcontext sc = new javasparkcontext(conf);      javardd<string> lines = sc.textfile("scrittura.txt");     javardd<integer> linelengths = lines.map(s -> s.length());     int totallength = linelengths.reduce((a, b) -> + b);     system.out.println("total: " + totallength);      javardd<string> flat = lines             .flatmap(x -> arrays.aslist(x.replaceall("[^a-za-z ]", "").split(" ")));     javapairrdd<string, integer> map = flat             .maptopair(x -> new tuple2<string, integer>(x, 1));      javapairrdd<string, integer> reduce = map             .reducebykey((x, y) -> x + y);      system.out.println(reduce.collect());      sc.stop();     sc.close(); }} 

this log:

exception in thread "main" java.lang.noclassdeffounderror: javax/servlet/filterregistration @ org.spark-project.jetty.servlet.servletcontexthandler.(servletcontexthandler.java:136) @ org.spark-project.jetty.servlet.servletcontexthandler.(servletcontexthandler.java:129) @ org.spark-project.jetty.servlet.servletcontexthandler.(servletcontexthandler.java:98) @ org.apache.spark.ui.jettyutils$.createservlethandler(jettyutils.scala:110) @ org.apache.spark.ui.jettyutils$.createservlethandler(jettyutils.scala:101) @ org.apache.spark.ui.webui.attachpage(webui.scala:78) @ org.apache.spark.ui.webui$$anonfun$attachtab$1.apply(webui.scala:62) @ org.apache.spark.ui.webui$$anonfun$attachtab$1.apply(webui.scala:62) @ scala.collection.mutable.resizablearray$class.foreach(resizablearray.scala:59) @ scala.collection.mutable.arraybuffer.foreach(arraybuffer.scala:47) @ org.apache.spark.ui.webui.attachtab(webui.scala:62) @ org.apache.spark.ui.sparkui.initialize(sparkui.scala:61) @ org.apache.spark.ui.sparkui.(sparkui.scala:74) @ org.apache.spark.ui.sparkui$.create(sparkui.scala:190) @ org.apache.spark.ui.sparkui$.createliveui(sparkui.scala:141) @ org.apache.spark.sparkcontext.(sparkcontext.scala:466) @ org.apache.spark.api.java.javasparkcontext.(javasparkcontext.scala:61) @ wordcount.main(wordcount.java:16) caused by: java.lang.classnotfoundexception: javax.servlet.filterregistration @ java.net.urlclassloader.findclass(urlclassloader.java:381) @ java.lang.classloader.loadclass(classloader.java:424) @ sun.misc.launcher$appclassloader.loadclass(launcher.java:331) @ java.lang.classloader.loadclass(classloader.java:357) ... 18 more

this pom.xml:

    <project xmlns="http://maven.apache.org/pom/4.0.0" xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"   xsi:schemalocation="http://maven.apache.org/pom/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">   <modelversion>4.0.0</modelversion>    <artifactid>examples</artifactid>   <version>0.0.1-snapshot</version>   <packaging>jar</packaging>    <name>examples</name>   <url>http://maven.apache.org</url>    <properties>     <project.build.sourceencoding>utf-8</project.build.sourceencoding>   </properties>    <dependencies>     <dependency>       <groupid>junit</groupid>       <artifactid>junit</artifactid>       <version>3.8.1</version>       <scope>test</scope>     </dependency>     <dependency>         <groupid>org.apache.spark</groupid>         <artifactid>spark-core_2.10</artifactid>         <version>1.5.1</version>     </dependency>     <dependency>     <groupid>org.apache.spark</groupid>     <artifactid>spark-mllib_2.10</artifactid>     <version>1.5.0</version> </dependency>      <dependency>         <groupid>org.apache.hadoop</groupid>         <artifactid>hadoop-client</artifactid>         <version>2.6.2</version>     </dependency>      <dependency>       <groupid>org.eclipse.jetty.orbit</groupid>       <artifactid>javax.servlet</artifactid>       <version>3.0.0.v201112011016</version>    </dependency>    </dependencies> </project> 

how can solve it?

thank you!