从另一个类调用Spring Main方法错误

Question

@SpringBootApplication
public class Application {

    public static void main(String[] args) {
        try {
            SpringApplication.run(Application.class, args);
            System.out.println("No error");
        } catch (Exception e) {
            System.out.println("Error " + e);

        }

    }
}

public class FetchNewsPlugin implements Plugin {

    @Override
    public void initializePlugin(PluginManager manager, File pluginDirectory) {
        Runnable r = new Runnable() {
             public void run() {
                 String[] args = {};
                Application.main(args);
             }
         };

         new Thread(r).start();
         System.out.println("Plugin Intitialized");

    }

    @Override
    public void destroyPlugin() {
    }

}

日志输出：

线程“Thread-13”java.lang.noClassDeffounder中的异常错误：org/springframework/boot/springapplication at hello.application.main(application.java:11)at org.clinton.openfire.plugin.fetchnewsplugin$1.run（fetchnewsplugin.java:20)at java.lang.thread.run（thread.java:745)由：java.lang.classnotfoundexception：org.springframework.boot.springapplication at java.net.urlclassloader.findclass（urlclassloader java.lang.ClassLoader.LoadClass（ClassLoader.java:424),java.lang.ClassLoader.LoadClass（ClassLoader.java:357)...还有3个

引发异常的位置：

 /**
     * Finds and loads the class with the specified name from the URL search
     * path. Any URLs referring to JAR files are loaded and opened as needed
     * until the class is found.
     *
     * @param name the name of the class
     * @return the resulting class
     * @exception ClassNotFoundException if the class could not be found,
     *            or if the loader is closed.
     * @exception NullPointerException if {@code name} is {@code null}.
     */
    protected Class findClass(final String name)
        throws ClassNotFoundException
    {
        final Class result;
        try {
            result = AccessController.doPrivileged(
                new PrivilegedExceptionAction>() {
                    public Class run() throws ClassNotFoundException {
                        String path = name.replace('.', '/').concat(".class");
                        Resource res = ucp.getResource(path, false);
                        if (res != null) {
                            try {
                                return defineClass(name, res);
                            } catch (IOException e) {
                                throw new ClassNotFoundException(name, e);
                            }
                        } else {
                            return null;
                        }
                    }
                }, acc);
        } catch (java.security.PrivilegedActionException pae) {
            throw (ClassNotFoundException) pae.getException();
        }
        if (result == null) {
            throw new ClassNotFoundException(name);
        }
        return result;
    }

Answer 1

看起来您正在使用URLClassLoader来加载所需的类。但是，URLClassLoader应该包含它所依赖的所有项或jar，而不仅仅是jar本身。

换句话说，您最好提取您的jar，并将所有必要的项添加到您的URLClassLoader中。

这样它就应该起作用了。如果有问题请告诉我。