EDIT5更新/
我正在使用 Maven 3.3.3。
我只是创建新项目并添加编译和执行插件，作为网络上的示例。
我尝试执行，但出现错误
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.2.1:java (default-cli) on project QNAProject: An exception occured while executing the Java class. com.jadex.qna.QNAProject.App -> [Help 1]<br>
[ERROR] <br>
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.<br>
[ERROR] Re-run Maven using the -X switch to enable full debug logging.<br>
[ERROR] <br>
[ERROR] For more information about the errors and possible solutions, please read the following articles:<br>
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException<br>
我尝试了 exec-maven-plugin 版本 1.2.1 和 1.4.0，但得到了同样的错误。这是我的 pom.xml
<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.jadex.qna</groupId>
<artifactId>QNAProject</artifactId>
<version>0.1</version>
<packaging>jar</packaging>
<name>QNAProject</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.3.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
<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>
<executable>maven</executable>
<mainClass>com.jadex.qna.QNAProject.App</mainClass>
</configuration>
</plugin>
</plugins>
</build>
</project>
我什至尝试了来自多个站点的工作示例项目，
比如
http://examples.javacodegeeks.com/enterprise-java/maven/create-java-project-with-maven-example/
http://www.mkyong.com/maven/how-to-create-a-java-project-with-maven/
但我得到了同样的错误。
我在 C:\apache-maven-3.3.3 解压缩了 maven 并创建了环境变量 MAVEN_HOME 作为相同的路径。 有什么问题？
====================================
编辑:这是结果
嗯..我设置了 MAVEN_HOME，而不是 M2_HOME，因为我发现的教程说只设置它......
当然，echo %MAVEN_HOME% 显示
C:\apache-maven-3.3.3
错了吗？
我将 %MAVEN_HOME%\bin 添加到 PATH 变量，但它也不起作用。
而且，我正在使用 eclipse
=====================================
EDIT2:这是完整的日志。我使用了目标 'clean exec:java -e -X'
太长了，我上传到我的博客里了。
请注意，我将存储库文件夹从 C:\Users.....m2 更改为新的本地存储库文件夹 C:\apache-maven-localrepository
=======================================
EDIT3:我像这样更改了 maven-compiler-plugin 设置
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<configuration>
<verbose>true</verbose>
<fork>true</fork>
<executable>${env.JAVA_HOME}/bin/javac</executable>
<compilerVersion>1.5</compilerVersion>
<!-- <source>1.8</source>
<target>1.8</target> -->
</configuration>
</plugin>
它阻止了我从 mvn -e compile exec:java 中遇到错误，但我无法使用 mvn exec:java -Dexec.mainClass="com.jadex.qna. QNAProject.App"
=================================
EDIT4:好的，我会从底部开始尝试，然后再次发布。感谢您的真诚帮助。
======================================
编辑5
我重置了所有序列...重新安装了 eclipse、maven...并重新创建了项目...但没有任何效果...
我更改了 eclipse 设置以将 JDK 路径修复为已安装的 jdk 路径，而不是 JRE 路径。然后我发现'mvn -e clean compile exec:java'正在工作，但我只想'mvn clean exec:java'工作。它根本不起作用。
你可以在这里查看完整的源代码
这是“mvn -e clean exec:java”的当前控制台消息
[WARNING]
[WARNING] Some problems were encountered while building the effective settings
[WARNING] expected START_TAG or END_TAG not TEXT (position: TEXT seen ...ore artifacts.\n |\n | Default: ${user.home}/.m2/repository\n <l... @53:5) @ C:\apache-maven-3.3.3\conf\settings.xml, line 53, column 5
[WARNING] expected START_TAG or END_TAG not TEXT (position: TEXT seen ...ore artifacts.\n |\n | Default: ${user.home}/.m2/repository\n <l... @53:5) @ C:\apache-maven-3.3.3\conf\settings.xml, line 53, column 5
[WARNING]
[INFO] Scanning for projects...
[INFO]
[INFO] ------------------------------------------------------------------------
[INFO] Building MavenTestProject 0.0.1-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO]
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ MavenTestProject ---
[INFO] Deleting C:\Users\bonavision_laptop\Desktop\Project\JadeX\MavenTestProject\MavenTestProject\target
[INFO]
[INFO] --- exec-maven-plugin:1.4.0:java (default-cli) @ MavenTestProject ---
[WARNING]
java.lang.ClassNotFoundException: com.jadex.qna.MavenTestProject.App
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:281)
at java.lang.Thread.run(Thread.java:745)
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.900 s
[INFO] Finished at: 2015-06-15T17:42:19+09:00
[INFO] Final Memory: 8M/153M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.codehaus.mojo:exec-maven-plugin:1.4.0:java (default-cli) on project MavenTestProject: An exception occured while executing the Java class. com.jadex.qna.MavenTestProject.App -> [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
最佳答案
当它也与 eclipse 不兼容时，就会出现此问题。
试试这个
mvn clean install eclipse:eclipse
投票，如果它能帮助其他成员
关于java - exec-maven-plugin 错误，即使在工作示例中也是如此，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/30836673/