Maven exec:java 多模块项目的目标 [英] Maven exec:java goal on a multi-module project
问题描述
我正在尝试在一个简单的双模块项目上运行 exec-maven-plugin 的 exec:java 目标，其中一个模块依赖于另一个.到目前为止，我找不到有效的配置.这是一个简化的测试用例:
I'm trying to run exec-maven-plugin's exec:java goal on a simple two-module project where one module depends on the other. So far I can't find a configuration that works. Here's a boiled-down test case:
+ exec-multi-module-test/
+ pom.xml
+ module1/
+ pom.xml
+ src/
+ main/
+ java/
+ HelloPrinter.java
+ module2/
+ pom.xml
+ src/
+ main/
+ java/
+ MyMain.java
这是父 pom:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.mkscrg.sandbox</groupId>
<artifactId>exec-multi-module-test</artifactId>
<version>1.0</version>
<packaging>pom</packaging>
<modules>
<module>module1</module>
<module>module2</module>
</modules>
<build>
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
</plugin>
</plugins>
</build>
</project>
module1 的 pom:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<artifactId>exec-multi-module-test</artifactId>
<groupId>com.mkscrg.sandbox</groupId>
<version>1.0</version>
</parent>
<artifactId>module1</artifactId>
</project>
module2 的 pom:4.0.0
module2's pom:
4.0.0
<parent>
<artifactId>exec-multi-module-test</artifactId>
<groupId>com.mkscrg.sandbox</groupId>
<version>1.0</version>
</parent>
<artifactId>module2</artifactId>
<dependencies>
<dependency>
<groupId>com.mkscrg.sandbox</groupId>
<artifactId>module1</artifactId>
<version>${project.version}</version>
</dependency>
</dependencies>
</project>
这个项目从顶部编译成功，但是运行 mvn exec:java -Dexec.mainClass=myMain 失败:
This project compiles successfully from the top, but running mvn exec:java -Dexec.mainClass=myMain fails:
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Build Order:
[INFO]
[INFO] exec-multi-module-test
[INFO] module1
[INFO] module2
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building exec-multi-module-test 1.0
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] >>> exec-maven-plugin:1.2.1:java (default-cli) @ exec-multi-module-test >>>
[INFO]
[INFO] <<< exec-maven-plugin:1.2.1:java (default-cli) @ exec-multi-module-test <<<
[INFO]
[INFO] --- exec-maven-plugin:1.2.1:java (default-cli) @ exec-multi-module-test ---
[WARNING]
java.lang.ClassNotFoundException: MyMain
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:285)
at java.lang.Thread.run(Thread.java:680)
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] exec-multi-module-test ............................ FAILURE [0.363s]
[INFO] module1 ........................................... SKIPPED
[INFO] module2 ........................................... SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.566s
[INFO] Finished at: Mon Jun 18 14:11:54 PDT 2012
[INFO] Final Memory: 3M/81M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.2.1:java (default-cli) on project exec-multi-module-test: An exception occured while executing the Java class. MyMain -> [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/MojoExecutionException
配置此项目以允许 exec:java 看到 MyMain 的正确方法是什么?
What's the right way to configure this project to allow exec:java to see MyMain?
如果您想自己尝试，这里有一个要点:https://gist.github.com/2950830
Here's a gist if you'd like to try this yourself: https://gist.github.com/2950830
澄清:我知道可以 mvn install 然后从 module2 的目录运行 exec:java 或使用-pl 标志从顶部开始.但是，我想避免运行 mvn install.为了在多模块项目中运行这个目标，没有必要修改我的本地存储库.就像 mvn compile 正常工作"一样对于多模块项目，其他目标/阶段也应如此.
Clarification: I know it's possible to mvn install and then either run exec:java from module2's directory or use the -pl flag from the top. However, I'd like to avoid running mvn install. It shouldn't be necessary to modify my local repository in order to run this goal in a multi-module project. Just as mvn compile "just works" with a multi-module project, so should other goals/phases.
推荐答案
多模块项目中的目标，当从父级运行时，将针对所有模块运行.我不认为那是你想要的.你可以试试:
Goals in a multi-module project, when run from the parent, will run against all modules. I don't think that's what you want. You can try:
mvn exec:java -pl module2 -Dexec.mainClass=MyMain
那可能有用吗?更多信息:
That might work? More info:
但是，我认为在运行之前将目录更改为包含可执行文件的子模块更直观.
However, I think it's more intuitive to change directory to the sub-module containing the executable before running it.
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