我使用tomcat7和tomcat-maven插件.我可以让它热切换我的jsp但它只有在我直接在目标中修改它才有效.如何让tomcat也在我的sources目录中查找更改？

的pom.xml

 <plugin>
            <groupId>org.apache.tomcat.maven</groupId>
            <artifactId>tomcat7-maven-plugin</artifactId>
            <version>2.2</version>
            <configuration>
                <serverXml>${project.build.directory}/config/tomcat-config/${usingDb}/server.xml</serverXml>
                <tomcatUsers>${project.build.directory}/config/tomcat-config/tomcat-users.xml</tomcatUsers>
                <configurationDir>${project.build.directory}/config/tomcat-config</configurationDir>
                <additionalClassesDirs>
                    <classesDir>${project.basedir}/src/main/webapp</classesDir>
                </additionalClassesDirs>
                <contextReloadable>true</contextReloadable>
                <port>${tomcat.http.local.port}</port>
                <path>/${url.contextPath}</path>
            </configuration>
        </plugin>