Maven使用

1.提示某些java语言特性不支持，这可能是由于maven默认使用的java compiler的版本太低所致，需在pom的<build>中添加maven-compiler-plugin

 31          <plugin>
 32             <groupId>org.apache.maven.plugins</groupId>
 33             <artifactId>maven-compiler-plugin</artifactId>
 34             <configuration>
 35                 <source>1.6</source>
 36                 <target>1.6</target>
 37             </configuration>
 38          </plugin>

 2.注意pom文件中定义dependency时的scope是compile还是provided

3.maven的源代码中，关于dependency:tree这一部分的实现的代码，觉得写得不错，计划后面看，分为graph与tree两个版本？

just interested in how maven pom resolve transitive dependencies

BFS的形式？

 

4.maven 

<optional>true</optional>

详细见https://maven.apache.org/guides/introduction/introduction-to-optional-and-excludes-dependencies.html

是在使用rose上传的功能，遇到与http://www.mkyong.com/struts/java-lang-noclassdeffounderror-orgapachecommonsiooutputdeferredfileoutputstream/ 

类似的问题时候，排查查到的

从而需要单独添加对commons-io的依赖

 

5.maven新建工程

mvn archetype:create -DgroupId=groupId -DartifactId=projectName -Dversion=1.0.0 -DpackageName=com.renren.ad

6.maven调试

出错需要进行调试的时候加上一个－ｘ

7.正常使用时需要的插件

70   <build>
 71      <plugins>
 72        <plugin>
 73           <groupId>org.apache.maven.plugins</groupId>
 74           <artifactId>maven-compiler-plugin</artifactId>
 75           <configuration>
 76               <source>1.6</source>
 77               <target>1.6</target>
 78               <verbose>true</verbose>
 79               <encoding>UTF-8</encoding>
 80               <compilerArguments>
 81                   <sourcepath>${project.basedir}/src/main/java</sourcepath>
 82               </compilerArguments>
 83           </configuration>
 84       </plugin>
 85       <plugin>
 86           <groupId>org.apache.maven.plugins</groupId>
 87           <artifactId>maven-resources-plugin</artifactId>
 88           <configuration>
 89                <encoding>UTF-8</encoding>
 90           </configuration>
 91       </plugin>
 92     </plugins>
 93     <resources>
 94        <resource>
 95           <directory>${project.basedir}/src/main/resources</directory>
 96        </resource>
 97     </resources>
 98  </build>

在这个之前的，即文件的开头需要如下配置

  1 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  2   xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  3   <modelVersion>4.0.0</modelVersion>
  4 
  5   <groupId>com.xxx.xxx</groupId>
  6   <artifactId>logxxxxxxx</artifactId>
  7   <version>1.0-SNAPSHOT</version>
  8   <packaging>jar</packaging>
  9 
 10   <name>logxxxxxxxx</name>
 11   <url>http://maven.apache.org</url>
 12 
 13   <properties>
 14     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 15   </properties>
 16 
 17   <parent>
 18     <groupId>com.xxxxxx</groupId>
 19     <artifactId>xxxxxxx-root-pom</artifactId>
 20     <version>1.0-SNAPSHOT</version>
 21   </parent>
 22 
 23   <dependencies>
 24        ......
 25   </dependencies>   

 

8.maven插件

maven-assembly-plugin

128       <plugin>
129           <groupId>org.apache.maven.plugins</groupId>
130           <artifactId>maven-assembly-plugin</artifactId>
131           <version>2.4.1</version>
132           <configuration>
133               <!--get all project dependencies-->
134               <descriptorRefs>
135                   <descriptorRef>jar-with-dependencies</descriptorRef>
136               </descriptorRefs>
137           </configuration>
138           <executions>
139               <execution>
140                   <id>make-assembly</id>
141                   <!--bind to package phase-->
142                   <phase>package</phase>
143                   <goals>
144                       <goal>single</goal>
145                   </goals>
146               </execution>
147           </executions>
148       </plugin>

maven-shade-plugin

150       <plugin>
151           <groupId>org.apache.maven.plugins</groupId>
152           <artifactId>maven-shade-plugin</artifactId>
153           <version>2.4</version>
154           <executions>
155               <execution>
156                   <phase>package</phase>
157                   <goals>
158                       <goal>shade</goal>
159                   </goals>
160                   <configuration>
161                       <relocations>
162                           <relocation>
163                               <pattern>org.apache.thrift</pattern>
164                               <shadedPattern>org.shaded.thrift</shadedPattern>
165                           </relocation>
166                       </relocations>
167                   </configuration>
168               </execution>
169           </executions>
170       </plugin>

用于class relocation  https://maven.apache.org/plugins/maven-shade-plugin/examples/class-relocation.html

http://www.boyunjian.com/do/article/snapshot.do?uid=684161795280089944

http://www.infoq.com/cn/news/2011/06/xxb-maven-9-package/

http://www.cnblogs.com/xinsheng/p/4109573.html

http://blog.csdn.net/thc1987/article/details/44176481

http://zfei.me/blog/2014/05/23/use-maven-shade-plugin-to-resolve-java-dependency-version-conflict/

relocate时候将package和import涉及到的lib的package都改变了。

 

jarjar

https://www.mail-archive.com/user@hive.apache.org/msg09819.html

 http://grokbase.com/t/hive/user/13aaptne38/is-that-possible-to-use-hive-0-11-with-libthrift-0-7