Maven exec：多模块项目的java目标 [英] Maven exec:java goal on a multi-module project
问题描述
我正在尝试在简单的两个上运行 exec-maven-plugin 的 exec：java 目标-module项目，其中一个模块依赖于另一个模块。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
- 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：
http://maven.apache.org/xsd/maven-4.0.0.xsd>
4.0.0module2's pom: http://maven.apache.org/xsd/maven-4.0.0.xsd"> 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>此项目从顶部成功编译，但运行
mvn exec：java -Dexec.mainClass = myMain失败：This project compiles successfully from the top, but running
mvn exec:java -Dexec.mainClass=myMainfails:[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$1.run(ExecJavaMojo.java:285) at java.lang.Thread.run(Thread.java:680) [INFO] ------------------------------------------------------------------------ [INFO] Reactor Summary: [INFO] [INFO] exec-multi-module-test ............................ FAILURE [0.363s] [INFO] module1 ........................................... SKIPPED [INFO] module2 ........................................... SKIPPED [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 0.566s [INFO] Finished at: Mon Jun 18 14:11:54 PDT 2012 [INFO] Final Memory: 3M/81M [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.2.1:java (default-cli) on project exec-multi-module-test: An exception occured while executing the Java class. MyMain -> [Help 1] [ERROR] [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch. [ERROR] Re-run Maven using the -X switch to enable full debug logging. [ERROR] [ERROR] For more information about the errors and possible solutions, please read the following articles: [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException配置此项目以允许<$ c的正确方法是什么$ c> exec：java 查看
MyMain？What's the right way to configure this project to allow
exec:javato seeMyMain?编辑：这是一个要点如果您想自己尝试一下： https://gist.github.com/2950830
Here's a gist if you'd like to try this yourself: https://gist.github.com/2950830
编辑：澄清：我知道可以
mvn install然后运行exec：java来自module2的目录或使用顶部的-pl标志。但是，我想避免运行mvn install。没有必要修改我的本地存储库以便在多模块项目中运行此目标。正如mvn编译只适用于多模块项目一样，其他目标/阶段也是如此。Clarification: I know it's possible to
mvn installand then either runexec:javafrommodule2's directory or use the-plflag from the top. However, I'd like to avoid runningmvn install. It shouldn't be necessary to modify my local repository in order to run this goal in a multi-module project. Just asmvn 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，当从父项运行时，将针对所有模块运行。我不认为这就是你想要的。您可以尝试：
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:
- Running a specific Maven plugin goal from the command line in a sub-module of a multi-module reactor project
但是，我认为在运行目录之前将目录更改为包含可执行文件的子模块更为直观。
However, I think it's more intuitive to change directory to the sub-module containing the executable before running it.
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- java /
- main /
- java /
- main /
