Maven使用tips(1)

1.使用Maven打出root.war以外的命名的war

			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-war-plugin</artifactId>
				<version>${maven-war-plugin.version}</version>
				<configuration> 
     				<warName>pcc-service</warName> 
     				<webResources> 
      					<resource> 
       						<directory>src/main/webapp/WEB-INF</directory> 
       						<filtering>true</filtering> 
       						<targetPath>WEB-INF</targetPath> 
      					</resource>      					
     				</webResources> 
    			</configuration> 
			</plugin>

如果父pom中使用的是<dependencies>....</dependencies>方式，则子pom会自动使用pom中的jar包；
如果父pom使用<dependencyManagement><dependencies>....</dependencies></dependencyManagement>

方式，则子pom不会自动使用父pom中的jar包，

这时如果子pom想使用的话，就要给出groupId和artifactId，无需给出version

3.当引用父pom.xml的依赖Jar时，没有加version时，报"dependencies.dependency.version is missing"的错

解决方法如下：

法一：Put the literal value of the version in the child pom

    <dependency>
      <groupId>org.springframework</groupId>
      <artifactId>spring-core</artifactId>
      <version>3.2.3.RELEASE</version>
      <scope>runtime</scope>
    </dependency>

方法2：Clear your .m2 cache normally located C:\Users\user.m2\repository.

I would say I do this pretty frequently
when I'm working in maven. Especially before committing so that

I can be more confident CI will run.
You don't have to nuke the folder every time, sometimes just your project packages

and the .cache folder are enough.

方法3：Add a relativePath tag to your parent pom declaration

   <parent>
      <groupId>com.mycompany.app</groupId>
      <artifactId>my-app</artifactId>
      <version>1</version>
     <relativePath>../parent/pom.xml</relativePath>
    </parent>

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