1）在目标部分的ant任务之前添加此行：

1) Add this line before ant tasks in target section:

<taskdef resource="net/sf/antcontrib/antlib.xml" 
 classpathref="maven.plugin.classpath" />

2）将完全以下依赖项添加到插件中：

2) Add exactly the following dependencies to plugin:

                        <dependencies>
                        <dependency>
                            <groupId>ant-contrib</groupId>
                            <artifactId>ant-contrib</artifactId>
                            <version>1.0b3</version>
                            <exclusions>
                                <exclusion>
                                    <groupId>ant</groupId>
                                    <artifactId>ant</artifactId>
                                </exclusion>
                            </exclusions>
                        </dependency>
                        <dependency>
                            <groupId>org.apache.ant</groupId>
                            <artifactId>ant-nodeps</artifactId>
                            <version>1.8.1</version>
                        </dependency>
                    </dependencies>