Question

EDIT5更新/

我正在使用Maven 3.3.3 我只是创建新项目并添加了编译和执行插件，作为网络上的示例我试图执行，但是我收到了错误

[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>

我甚至尝试了几个站点的工作示例项目，
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/

但我得到同样的错误。

我在C：\ apache-maven-3.3.3解压缩maven，并将环境变量MAVEN_HOME创建为相同的路径。有什么问题？

====================================

编辑：结果如下

enter image description here

嗯..我设置了MAVEN_HOME，而不是M2_HOME，因为教程我发现说只设置它...
当然，echo％MAVEN_HOME％显示

C：\ Apache的行家-3.3.3

是不是错了？

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，所以我在这里上传到了我的博客请注意，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

https://arincblossom.wordpress.com/2015/06/15/error-logs/

=======================================

EDIT3：我改变了像这样的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mvn -e compile exec:java的错误，但我无法使用mvn exec:java -Dexec.mainClass="com.jadex.qna.QNAProject.App"

=================================

EDIT4：好的，我会从底部尝试，然后重新发布。感谢您的真诚帮助。

======================================

EDIT5

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设置以修复已安装的jdk路径的JDK路径，而不是JRE路径。然后我发现'mvn -e clean compile exec：java'正在工作，但我想只是'mvn clean exec：java'工作。它根本不起作用。

您可以在此处查看完整来源

https://github.com/arincblossom/MavenTestProject

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

Answer 1

当问题与eclipse不兼容时，会出现此问题。

试试这个

mvn clean install eclipse:eclipse

投票，如果它可以帮助其他成员

Answer 2

您发布的错误日志说明如下：

java.lang.ClassNotFoundException  com.jadex.qna.QNAProject.App

因此，清楚错误的根源是什么。您正在尝试执行其文件Maven无法找到的类的main()方法。正如this SO article所讨论的那样，您可以先尝试显式编译，然后在生成类文件后执行：

mvn -e compile exec:java
mvn exec:java -Dexec.mainClass="com.jadex.qna.QNAProject.App"

Answer 3

我遇到了同样的问题，这是由端口冲突引起的。我的tomcat服务器尝试在端口8080上启动，但我已经有了它的绑定。 netstat -anto将显示端口绑定0.0.0.0:8080或类似的，它的PID将帮助您确定哪个进程已经在运行端口出价，要么在您的timcat服务器中更改它，要么在任何进程中使用出价。可能是由IIS，SKype或类似的引起的。

exec-maven-plugin错误，即使在工作示例

3 个答案: