如何解决无法找到或加载主类？

Question

I would like to build a java application. System reported error message:

Error: Could not find or load main class com.autoparts.autoeshop.Application

My controller:

package com.autoparts.autoeshop;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.data.jpa.repository.config.EnableJpaAuditing;

@SpringBootApplication
@EnableJpaAuditing
public class Application {

    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

And I have written JAVA_HOME on system property.

Answer 1

Your environment is not completly correct as the JAVA_HOME should point to the installation directory ( jdk1.8.0_161 ) instead of bin and the PATH should include %JAVA_HOME%/bin .

Your trial to compile with javac has been done from the wrong directory, you need to compile when you are in the java directory (including the relative path to the java file like com/autoparts/autoeshop/Application.java ). Maybe your project has a build system prepared in the project directory ( autoeshop ) like Maven (look for a pom.xml ) or Gradle (find a build.gradle )? If so, install the required build tool and run it, it will download all required dependencies and compile all the java files for you which is needed before you can run the application using the created jar file (typically found in a target (Maven) or build (Gradle) folder after the build tool ran.

Anyway, if you struggle with this kind of problems you may consider to start with some basic Java or at least Spring Boot tutorials.