Maven 和 Java：目标 org.codehaus.mojo:exec-maven-plugin:1.2.1:java 的参数“mainClass”丢失或无效
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Maven & Java: The parameters 'mainClass' for goal org.codehaus.mojo:exec-maven-plugin:1.2.1:java are missing or invalid
提问by gvanto
My Java EE proj builds fine, but when trying to execute get following error:
我的 Java EE 项目构建良好，但在尝试执行时出现以下错误：
gert@gert-VirtualBox:~/workspace/CDBOOKSTORE$ mvn exec:java
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building CDBOOKSTORE 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] >>> exec-maven-plugin:1.2.1:java (default-cli) @ CDBOOKSTORE >>>
[INFO]
[INFO] --- maven-dependency-plugin:2.8:copy (default) @ CDBOOKSTORE ---
[INFO]
[INFO] <<< exec-maven-plugin:1.2.1:java (default-cli) @ CDBOOKSTORE <<<
[INFO]
[INFO] --- exec-maven-plugin:1.2.1:java (default-cli) @ CDBOOKSTORE ---
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.505s [INFO] Finished at: Fri Nov 08 14:01:40 EST 2013
[INFO] Final Memory: 9M/21M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.2.1:java (default-cli) on project CDBOOKSTORE: The parameters 'mainClass' for goal org.codehaus.mojo:exec-maven-plugin:1.2.1:java are missing or invalid
-> [Help 1]
But in my pom.xmlfile (which I've edited following a Java EE book example), I havespecified the mainClassconfig:
但在我的pom.xml文件（我已经编辑下面一个Java EE书例子），我已经指定的mainClass配置：
<?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>org.aptovia.javaee7</groupId>
<artifactId>CDBOOKSTORE</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>app-client</packaging>
<name>CDBOOKSTORE</name>
<properties>
<endorsed.dir>${project.build.directory}/endorsed</endorsed.dir>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>javax</groupId>
<artifactId>javaee-api</artifactId>
<version>7.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.jboss.weld.se</groupId>
<artifactId>weld-se</artifactId>
<version>2.1.0.Final</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
<configuration>
<source>1.7</source>
<target>1.7</target>
<compilerArguments>
<endorseddirs>${endorsed.dir}</endorseddirs>
</compilerArguments>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-acr-plugin</artifactId>
<version>1.0</version>
<extensions>true</extensions>
<configuration>
<archive>
<manifest>
<mainClass>org.aptovia.javaee7.CDBOOKSTORE.Main</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-dependency-plugin</artifactId>
<version>2.8</version>
<executions>
<execution>
<phase>validate</phase>
<goals>
<goal>copy</goal>
</goals>
<configuration>
<outputDirectory>${endorsed.dir}</outputDirectory>
<silent>true</silent>
<artifactItems>
<artifactItem>
<groupId>javax</groupId>
<artifactId>javaee-endorsed-api</artifactId>
<version>7.0</version>
<type>jar</type>
</artifactItem>
</artifactItems>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<executions>
<execution>
<goals>
<goal>java</goal>
</goals>
<configuration>
<mainClass>org.aptovia.javaee7.CDBOOKSTORE.Main</mainClass>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
Also looks OK according to this: https://www.mojohaus.org/exec-maven-plugin/usage.html
根据这个看起来也不错：https: //www.mojohaus.org/exec-maven-plugin/usage.html
I've done an mvn clean, rebuilt, but still getting this error. Really not sure whats happening :(
我已经完成了 mvn clean，重建，但仍然收到此错误。真的不知道发生了什么:(
Any help much appreciated!
非常感谢任何帮助！
回答by ragnor
There is no such parameter like mainClassin exec-maven-plugin, try to use:
没有像mainClassexec-maven-plugin这样的参数，尝试使用：
<configuration>
<executable>java</executable>
<arguments>
<argument>-classpath</argument>
<classpath/>
<argument>org.aptovia.javaee7.CDBOOKSTORE.Main</argument>
</arguments>
</configuration>
回答by bronson
"configuration" must go outside "executions", like this:
“配置”必须在“执行”之外，像这样：
<plugins>
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>exec-maven-plugin</artifactId>
<version>1.2.1</version>
<executions>
<execution>
<goals>
<goal>java</goal>
</goals>
</execution>
</executions>
<configuration>
<mainClass>com.emilio.App</mainClass>
</configuration>
</plugin>
</plugins>
回答by Vaibs
Configuration seems correct with missing id parameter inside execution part. Proper way would be:
执行部分中缺少 id 参数的配置似乎是正确的。正确的方法是：
<executions>
<execution>
<id>someID</id>
<goals>
<goal>java</goal>
</goals>
<configuration>
<mainClass>org.aptovia.javaee7.CDBOOKSTORE.Main</mainClass>
</configuration>
</execution>
</executions>
Assuming you are running main method using maven, execution would be like below:
假设您正在使用 maven 运行 main 方法，执行将如下所示：
mvn exec:java@someID
mvn exec:java@someID
someID added inside execution part.
在执行部分添加了 someID。
回答by George
Make sure you execute the mvn exec:javafrom within the same directory where your pom.xmlwith exec configuration resides.
确保mvn exec:java从pom.xmlwith exec 配置所在的同一目录中执行。
回答by CatSleeping
If the <configuration>is outside the <executions>, it is the configuration for the plugin to be used no matter what the life-cycle phase is.
如果在<configuration>之外<executions>，则无论生命周期阶段是什么，它都是要使用的插件的配置。
If the <configuration>is inside the <executions>, it is the configuration to be used in certain life-cycle phase.
如果<configuration>位于 内部<executions>，则它是要在某个生命周期阶段使用的配置。
As Vabis has suggested, use mvn exec:java@someIDto execute the specific execution of the goal for a plugin.
正如 Vabis 所建议的，用于mvn exec:java@someID执行插件目标的特定执行。
For more information, please see https://maven.apache.org/guides/mini/guide-configuring-plugins.html.
有关更多信息，请参阅https://maven.apache.org/guides/mini/guide-configuring-plugins.html。
