exec-maven-plugin产生的进程会阻止Maven进程 [英] Process spawned by exec-maven-plugin blocks the maven process

问题描述

我正在尝试使用maven执行以下方案:

I am trying to execute the following scenario using maven :

1. 集成前阶段:使用主类(使用exec-maven-plugin)启动基于Java的应用程序
2. integration-phase:运行集成测试用例(使用maven-failsafe-plugin)
3. 集成后阶段:优雅地停止应用程序(使用exec-maven-plugin)

这是pom.xml片段:

Here is pom.xml snip:

    <plugins>
    <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>exec-maven-plugin</artifactId>
        <version>1.2.1</version>
        <executions>
            <execution>
                <id>launch-myApp</id>
                <phase>pre-integration-test</phase>
                <goals>
                    <goal>exec</goal>
                </goals>
            </execution>
        </executions>
        <configuration>
            <executable>java</executable>
            <arguments>
                <argument>-DMY_APP_HOME=/usr/home/target/local</argument>
                <argument>-Djava.library.path=/usr/home/other/lib</argument>
                <argument>-classpath</argument>
                <classpath/>
                <argument>com.foo.MyApp</argument>
            </arguments>
        </configuration>
    </plugin>
    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-failsafe-plugin</artifactId>
        <version>2.12</version>
        <executions>
            <execution>
                <goals>
                    <goal>integration-test</goal>
                    <goal>verify</goal>
                </goals>
            </execution>
        </executions>
        <configuration>
            <forkMode>always</forkMode>
        </configuration>
    </plugin>
</plugins>

如果执行mvn集成后测试，则我的应用程序将作为maven进程的子进程启动，但是该应用程序进程阻止maven进程执行下一阶段的集成测试.后来我发现在maven exec插件中有一个错误(或缺少功能?)，因为该应用程序进程阻塞了Maven进程.为了解决这个问题，我将MyApp.java的调用封装在外壳脚本中，然后附加了"/dev/null 2>& 1&"产生一个单独的后台进程.这是来自runTest.sh的片段(这只是一个片段，而不是实际的片段):

If I execute mvn post-integration-test, my application is getting started as a child process of the maven process, but the application process is blocking the maven process from executing the integration tests which comes in the next phase. Later I found that there is a bug (or missing functionality?) in maven exec plugin, because of which the application process blocks the maven process. To address this issue, I have encapsulated the invocation of MyApp.java in a shell script and then appended "/dev/null 2>&1 &" to spawn a separate background process. Here is the snip (this is just a snip and not the actual one) from runTest.sh:

java - DMY_APP_HOME =$2 com.foo.MyApp > /dev/null 2>&1 &

尽管这解决了我的问题，但是还有其他方法可以解决吗?我是否缺少exec-maven-plugin的任何论点?

Although this solves my issue, is there any other way to do it? Am I missing any argument for exec-maven-plugin?

推荐答案

您可以使用async配置参数来实现所需的功能.另请参阅asyncDestroyOnShutdown，它将默认在JVM退出时关闭应用程序.

You can use the async configuration parameter to achieve what you require. Also see asyncDestroyOnShutdown which will shutdown the app on JVM exit by default.

https://www.mojohaus.org/exec -maven-plugin/exec-mojo.html#async

如果将其设置为true，则子进程将异步执行，并且构建过程将继续并行执行.

If set to true the child process executes asynchronously and build execution continues in parallel.

    <plugin>
        <groupId>org.codehaus.mojo</groupId>
        <artifactId>exec-maven-plugin</artifactId>
        <version>1.6.0</version>
        <executions>
            <execution>
                <id>launch-myApp</id>
                <phase>pre-integration-test</phase>
                <goals>
                    <goal>exec</goal>
                </goals>
            </execution>
        </executions>
        <configuration>
            <executable>java</executable>
            <arguments>
                <argument>-DMY_APP_HOME=/usr/home/target/local</argument>
                <argument>-Djava.library.path=/usr/home/other/lib</argument>
                <argument>-classpath</argument>
                <classpath/>
                <argument>com.foo.MyApp</argument>
            </arguments>
            <async>true</async>
        </configuration>
    </plugin>

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