在一个简单的maven项目（jar）中，我有一些我不了解的Maven和带有eclipse的执行ID
我将eclipse 2018-12与嵌入式Maven（3.5.3 / 1.10.020181127-2120）一起使用
当我在pom.xml中尝试此代码时
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.3.2</version>
<executions>
<execution>
<id>first-cli</id>
<configuration>
<mainClass>com.zb.test.HelloFirst</mainClass>
</configuration>
</execution>
<execution>
<id>second-cli</id>
<configuration>
<mainClass>com.zb.test.HelloSecond</mainClass>
</configuration>
</execution>
</executions>
</plugin>
执行时
exec:java@first-cli
我得到类HelloFirst.java的结果
[INFO] Scanning for projects...
[INFO]
[INFO] ----------------------< com.zb.membox:test >-----------------------
[INFO] Building test 0.0.1-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- exec-maven-plugin:1.3.2:java (first-cli) @ test ---
[WARNING] Warning: killAfter is now deprecated. Do you need it ? Please comment on MEXEC-6.
hello world from first client
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.019 s
[INFO] Finished at: 2019-02-09T13:54:35+01:00
[INFO] ------------------------------------------------------------------------
执行时
exec:java@second-cli
我得到类HelloSecond.java的结果
[INFO] Scanning for projects...
[INFO]
[INFO] ----------------------< com.zb.membox:test >-----------------------
[INFO] Building test 0.0.1-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- exec-maven-plugin:1.3.2:java (second-cli) @ test ---
[WARNING] Warning: killAfter is now deprecated. Do you need it ? Please comment on MEXEC-6.
hello world from second client
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.019 s
[INFO] Finished at: 2019-02-09T13:54:35+01:00
[INFO] ------------------------------------------------------------------------
我得到类HelloSecond.java的结果
当我指定一个不存在的ID
exec:java@third-cli
它会产生我所期望的错误。
[INFO] Scanning for projects...
[INFO]
[INFO] ----------------------< com.zb.membox:test >-----------------------
[INFO] Building test 0.0.1-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- exec-maven-plugin:1.3.2:java (third-cli) @ test ---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 1.014 s
[INFO] Finished at: 2019-02-09T13:55:17+01:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.3.2:java (third-cli) on project test: The parameters 'mainClass' for goal org.codehaus.mojo:exec-maven-plugin:1.3.2:java are missing or invalid -> [Help 1]
[ERROR]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR]
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/PluginParameterException
但是当我尝试对编译器插件做同样的事情时，这里有些奇怪的地方是编译器插件的pom.xml部分
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.2</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
<executions>
<execution>
<id>compilefirst</id>
<phase>none</phase>
<goals>
<goal>compile</goal>
</goals>
<configuration>
<source>1.5</source>
<target>1.5</target>
</configuration>
</execution>
<execution>
<id>compilesecond</id>
<phase>none</phase>
<goals>
<goal>compile</goal>
</goals>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</execution>
<execution>
<id>default-compile</id>
<phase>compile</phase>
<goals>
<goal>compile</goal>
</goals>
</execution>
</executions>
</plugin>
我更改源目标以确保执行被执行 当我执行
clean compiler:compile@compilefirst
可以采用1.5 Java版本
clean compiler:compile@compilesecond
可以采用1.6 Java版本
但是，如果我尝试使用不存在的id……它可以正常工作！！！
clean compiler:compile@compilethird
结果
[INFO] Scanning for projects...
[INFO]
[INFO] ----------------------< com.zb.membox:test >-----------------------
[INFO] Building test 0.0.1-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ test ---
[INFO] Deleting C:\Users\zb\Desktop\wspace-java\test\target
[INFO]
[INFO] --- maven-compiler-plugin:3.2:compile (compilethird) @ test ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 30 source files to C:\Users\zb\Desktop\wspace-java\test\target\classes
[INFO] /C:/Users/zb/Desktop/wspace-java/test/src/main/java/com/zb/test/TestMbREG.java: C:\Users\zb\Desktop\wspace-java\test\src\main\java\com\zb\test\TestMbREG.java uses or overrides a deprecated API.
[INFO] /C:/Users/zb/Desktop/wspace-java/test/src/main/java/com/zb/test/TestMbREG.java: Recompile with -Xlint:deprecation for details.
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 3.279 s
[INFO] Finished at: 2019-02-09T14:00:24+01:00
[INFO] ------------------------------------------------------------------------
我的问题是为什么？ Maven编译器是否具有默认执行ID？
非常感谢所有回复。