我是一个绝对的初学者（刚开始学习 JAVA/编程），我在学校使用带有 JDK 15.0.1 的 NetBeans IDE 13
我在 Apache NetBeans IDE 13 中运行这个简单的 Java Hello World 程序时遇到了这个问题：
/*
* Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
* Click nbfs://nbhost/SystemFileSystem/Templates/Project/Maven2/JavaApp/src/main/java/${packagePath}/${mainClassName}.java to edit this template
*/
package com.mycompany.testing;
/**
*
* @author Lenovo
*/
public class Testing {
public static void main(String[] args) {
System.out.println("Hello World!");
}
}
pom.xml：
<?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.mycompany.testing</groupId>
<artifactId>Testing</artifactId>
<version>1.0-SNAPSHOT</version>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>15</maven.compiler.source>
<maven.compiler.target>15</maven.compiler.target>
<exec.mainClass>com.mycompany.testing.Testing</exec.mainClass>
</properties>
</project>
输出：
cd E:\UUM 2023 SEM6\STA1123-PROGRAMMING 2\Exercises╱Tutorials\Exercise Answers\Source Code\Testing; "JAVA_HOME=C:\\Program Files\\Java\\jdk-15.0.1" cmd /c "\"C:\\Program Files\\NetBeans-13\\netbeans\\java\\maven\\bin\\mvn.cmd\" -Dexec.vmArgs= \"-Dexec.args=${exec.vmArgs} -classpath %classpath ${exec.mainClass} ${exec.appArgs}\" \"-Dexec.executable=C:\\Program Files\\Java\\jdk-15.0.1\\bin\\java.exe\" -Dexec.mainClass=com.mycompany.testing.Testing -Dexec.classpathScope=runtime -Dexec.appArgs= \"-Dmaven.ext.class.path=C:\\Program Files\\NetBeans-13\\netbeans\\java\\maven-nblib\\netbeans-eventspy.jar\" -Dfile.encoding=UTF-8 org.codehaus.mojo:exec-maven-plugin:3.0.0:exec"
Running NetBeans Compile On Save execution. Phase execution is skipped and output directories of dependency projects (with Compile on Save turned on) will be used instead of their jar artifacts.
Scanning for projects...
-------------------< com.mycompany.testing:Testing >--------------------
Building Testing 1.0-SNAPSHOT
--------------------------------[ jar ]---------------------------------
--- exec-maven-plugin:3.0.0:exec (default-cli) @ Testing ---
Error: Could not find or load main class com.mycompany.testing.Testing
Caused by: java.lang.ClassNotFoundException: com.mycompany.testing.Testing
Command execution failed.
org.apache.commons.exec.ExecuteException: Process exited with an error: 1 (Exit value: 1)
at org.apache.commons.exec.DefaultExecutor.executeInternal (DefaultExecutor.java:404)
at org.apache.commons.exec.DefaultExecutor.execute (DefaultExecutor.java:166)
at org.codehaus.mojo.exec.ExecMojo.executeCommandLine (ExecMojo.java:982)
at org.codehaus.mojo.exec.ExecMojo.executeCommandLine (ExecMojo.java:929)
at org.codehaus.mojo.exec.ExecMojo.execute (ExecMojo.java:457)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:210)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:156)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:148)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
at org.apache.maven.cli.MavenCli.execute (MavenCli.java:972)
at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:293)
at org.apache.maven.cli.MavenCli.main (MavenCli.java:196)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:64)
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke (Method.java:564)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:282)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:225)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:406)
at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:347)
------------------------------------------------------------------------
BUILD FAILURE
------------------------------------------------------------------------
Total time: 2.558 s
Finished at: 2023-05-07T15:41:19+08:00
------------------------------------------------------------------------
Failed to execute goal org.codehaus.mojo:exec-maven-plugin:3.0.0:exec (default-cli) on project Testing: Command execution failed.: Process exited with an error: 1 (Exit value: 1) -> [Help 1]
To see the full stack trace of the errors, re-run Maven with the -e switch.
Re-run Maven using the -X switch to enable full debug logging.
For more information about the errors and possible solutions, please read the following articles:
[Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
我需要有关如何解决错误的帮助：
Error: Could not find or load main class com.mycompany.testing.Testing
Caused by: java.lang.ClassNotFoundException: com.mycompany.testing.Testing
Command execution failed.
这个问题：
Failed to execute goal org.codehaus.mojo:exec-maven-plugin:3.0.0:exec (default-cli) on project Testing: Command execution failed.: Process exited with an error: 1 (Exit value: 1) -> [Help 1]
To see the full stack trace of the errors, re-run Maven with the -e switch.
Re-run Maven using the -X switch to enable full debug logging.
For more information about the errors and possible solutions, please read the following articles:
[Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException
语法没有错误。我所做的只是运行文件。我只想能够运行代码并让 IDE 像往常一样运行。需要帮助。