google app engine - appengine-maven-plugin has a maven-war-plugin in the background? it gets called twice if I define on my own -

i have tried lot of things, , seems project executes "maven-war-plugin" twice.

because of can't run optimizations merging classes single jar (using maven shade plugin).

i pretty sure appengine-maven-plugin calling maven-war-plugin create appengine packaging. know because tried removing own definitition of "maven-war-plugin" , it's still execute "magically". makes sense in way?

my pom.xml is:

 <plugin>             <groupid>org.apache.maven.plugins</groupid>             <artifactid>maven-war-plugin</artifactid>             <version>2.3</version>             <executions>               <execution>                 <phase>package</phase>                 <goals>                   <goal>war</goal>                 </goals>               </execution>             </executions>             <configuration>                 <webresources>                     <!-- in order interpolate version pom appengine-web.xml -->                     <resource>                         <directory>${basedir}/src/main/webapp/web-inf</directory>                         <filtering>true</filtering>                         <excludes>                             <exclude>**/*.jar</exclude>                         </excludes>                         <targetpath>web-inf</targetpath>                     </resource>                 </webresources>             </configuration>         </plugin>             <plugin>             <groupid>com.google.appengine</groupid>             <artifactid>appengine-maven-plugin</artifactid>             <version>${appengine.target.version}</version>                                           <configuration>                      <usejava7>true</usejava7>                 <address>0.0.0.0</address>                 <port>8080</port>                 <compileencoding>utf-8</compileencoding>                  <jvmflags>                     <jvmflag>-xx:-usesplitverifier</jvmflag>                     <jvmflag>-xms512m</jvmflag>                     <jvmflag>-xmx2048m</jvmflag>                     <jvmflag>-xx:newsize=256m</jvmflag>                     <jvmflag>-xx:maxnewsize=256m</jvmflag>                     <jvmflag>-xx:permsize=512m</jvmflag>                     <jvmflag>-xx:maxpermsize=768m</jvmflag>                     <jvmflag>-xdebug</jvmflag>                     <jvmflag>-agentlib:jdwp=transport=dt_socket,address=31337,server=y,suspend=n</jvmflag>                 </jvmflags>                             </configuration>         </plugin> 

it looks explicitly running war plugin twice, have execution declared in executions section plugin. appengine-maven-plugin declares package phase must have completed. doesn't care happens during packaging.

https://github.com/googlecloudplatform/appengine-guestbook-java/blob/master/pom.xml example of how this.