[ERROR] Failed to execute goal org.apache.maven.plugins:maven-assembly-plugin:2.4:single (make-assembly) on project hive-udf: Error reading assemblies: No assembly descriptors found. -> [Help 1]

自己在使用maven进行package操作时出现
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-assembly-plugin:2.4:single (make-assembly) on project hive-udf: Error reading assemblies: No assembly descriptors found. -> [Help 1]
错误。
通过报错信息，应该是maven-assembly-plugin的元素没有指定。
解决方案：
第1步：
把原来的内容：

<plugin>
    <artifactId>maven-assembly-plugin</artifactId>
    <configuration>
        <descriptors></descriptors>
        <finalName>hive-udf</finalName>
        <outputDirectory>${project.build.directory}/../..</outputDirectory>
        <appendAssemblyId>false</appendAssemblyId>
    </configuration>
    <executions>
        <execution>
            <id>make-assembly</id>
            <phase>package</phase>
            <goals>
                <goal>single</goal>
            </goals>
        </execution>
    </executions>
</plugin>

修改为

<plugin>
    <artifactId>maven-assembly-plugin</artifactId>
    <configuration>
        <descriptors>../jar.xml</descriptors>
        <finalName>hive-udf</finalName>
        <outputDirectory>${project.build.directory}/../..</outputDirectory>
        <appendAssemblyId>false</appendAssemblyId>
    </configuration>
    <executions>
        <execution>
            <id>make-assembly</id>
            <phase>package</phase>
            <goals>
                <goal>single</goal>
            </goals>
        </execution>
    </executions>
</plugin>

第2步：在项目的根目录添加jar.xml

<assembly xmlns="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/plugins/maven-assembly-plugin/assembly/1.1.2 http://maven.apache.org/xsd/assembly-1.1.2.xsd">
  <id>jar</id>
  <formats>
    <format>jar</format>
  </formats>
  <includeBaseDirectory>false</includeBaseDirectory>
  <dependencySets>
    <dependencySet>
      <outputDirectory>/</outputDirectory>
      <useProjectArtifact>true</useProjectArtifact>
      <unpack>true</unpack>
      <scope>runtime</scope>
      <useTransitiveDependencies>false</useTransitiveDependencies>
      <includes>
        <include>brucedu.bigdata:*</include>
      </includes>
    </dependencySet>
  </dependencySets>
  <fileSets>
    <fileSet>
      <directory>target/classes</directory>
      <outputDirectory>/</outputDirectory>
    </fileSet>
  </fileSets>
</assembly>

重新执行package命令，BUILD SUCCESS！