maven - Get Code Coverage for GWT project using Jacoco surefire -

i having gwt maven project , want find code coverage. getting report coverage 0%.

pom.xml

    <plugin>         <groupid>org.codehaus.mojo</groupid>         <artifactid>gwt-maven-plugin</artifactid>         <version>2.7.0</version>         <executions>             <execution>                 <configuration>                     <extrajvmargs>-xmx512m</extrajvmargs>                 </configuration>                 <goals>                     <goal>compile</goal>                     <goal>generateasync</goal>                     <goal>test</goal>                 </goals>             </execution>         </executions>     </plugin>       <plugin>         <artifactid>maven-surefire-plugin</artifactid>         <version>2.6</version>         <configuration>             <argline>${jacocoargs}</argline>         </configuration>     </plugin>      <plugin>         <groupid>org.jboss.errai</groupid>         <artifactid>jacoco-gwt-maven-plugin</artifactid>         <version>0.5.4.201202141554</version>         <configuration>             <snapshotdirectory>${project.build.directory}/test-classes</snapshotdirectory>             <propertyname>jacocoargs</propertyname>         </configuration>         <executions>             <execution>                 <id>jacoco-initialize</id>                 <goals>                     <goal>prepare-agent</goal>                 </goals>             </execution>             <execution>                 <id>jacoco-site</id>                 <phase>package</phase>                 <goals>                     <goal>report</goal>                 </goals>             </execution>          </executions>     </plugin> 

gwttestcase

public class gwttestcovergesample extends gwttestcase {    public string getmodulename() {     return "com.test.sample.covergesamplejunit";   }   public void testfieldverifier() {   }   public void testgreetingservice() {     greetingserviceasync greetingservice = gwt.create(greetingservice.class);     servicedeftarget target = (servicedeftarget) greetingservice;     target.setserviceentrypoint(gwt.getmodulebaseurl() + "covergesample/greet");      delaytestfinish(10000);      greetingservice.greetserver("gwt user", new asynccallback<string>() {       public void onfailure(throwable caught) {           system.out.println("gwttestcovergesample.testgreetingservice().new asynccallback() {...}.onfailure()");         fail("request failure: " + caught.getmessage());       }       public void onsuccess(string result) {         asserttrue(result.startswith("hello, gwt user!"));         finishtest();       }     });   } } 

coveragesamplejunit.gwt.xml

<?xml version="1.0" encoding="utf-8"?> <module rename-to="covergesample">   <inherits name='com.test.sample.covergesample' />   <servlet path="/covergesample/greet" class="com.test.sample.server.greetingserviceimpl" /> </module> 

in target folder, can see site folder getting created correct report index.html file. when open index.html file coverage report 0%. please help.