同名文件处理
maven-assembly-plugin	覆盖
maven-shade-plugin	    追加


maven-assembly-plugin 例子
https://gitee.com/dyyx/demos/blob/master/h2demo/pomjar.xml


		 <plugin>
                <artifactId>maven-assembly-plugin</artifactId>
                <configuration>
                    <descriptorRefs>
                        <descriptorRef>jar-with-dependencies</descriptorRef>
                    </descriptorRefs>
                    <finalName>h2demoall</finalName>
                    <appendAssemblyId>false</appendAssemblyId>
                </configuration>
                <executions>
                    <execution>
                        <id>make-assembly</id>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>


推荐使用 maven-shade-plugin	


<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">  
    <resource>META-INF/spring.handlers</resource>  
</transformer>  
<transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">  
   <resource>META-INF/spring.schemas</resource> 
</transformer>


 maven-shade-plugin 使用指南