Jacoco code coverage reports are not generated for integration tests, and are not displayed in sonar

I have constructed Jacoco + Sonar in Maven. I can generate unit test coverage reports and show coverage in Sonar. But failed to generate reports for integration tests. "jacoco-it.exec" is generated, but when I go and open index.html it looks blank. But there are many integration tests that have been performed and passed on. The jacoco-sessions.html clearly states all the classes that are used internally. Please help me if you have any ideas what is wrong in the code below on integration tests. I also configured Sonar correctly and gave a path to get results for the integration tests. Please take a look once and help me if you have any ideas. pom.xml:

    <plugin>
<groupId>org.jacoco</groupId>
<artifactId>jacoco-maven-plugin</artifactId>
<configuration>
    <destFile>${project.build.directory}/coverage-reports/jacoco-it.exec</destFile>
    <dataFile>${project.build.directory}/coverage-reports/jacoco-it.exec</dataFile>  
 </configuration>
<executions>
<execution>
 <id>pre-integration-test</id 
<phase>pre-integration-test</phase>
<goals>
<goal>prepare-agent</goal>
</goals> </execution>
 <execution>
<id>post-integration-test</id>
<phase>post-integration-test</phase>
<goals>
<goal>report</goal>
                            </goals>
                        </execution>
                    </executions>
                </plugin>                                                                                                                                                                                <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-failsafe-plugin</artifactId>
                <version>2.19.1</version>
                <configuration>
                    <systemPropertyVariables>
                        <jacoco-agent.destfile>${project.build.directory}/coverage-reports/jacoco-it.exec</jacoco-agent.destfile>
                    </systemPropertyVariables>
                    <encoding>UTF-8</encoding>
                    <skipTests>false</skipTests>
                    <runOrder>alphabetical</runOrder>
                    <includes>
                        ....<There are integration tests>
                    </includes>
                    <excludes>
                        ....
                    </excludes>
                </configuration>
                <executions>
                    <execution>
                        <goals>
                            <goal>integration-test</goal>
                            <goal>verify</goal> 
                        </goals>
                    </execution>
                </executions> 
            </plugin>