异常 class jdk.internal.loader.ClassLoaders$AppClassLoader 无法转换为 class java.net.URLClassLoader

Question

I don't understand how to fix it, first time i see mistake like this. i downland this from github https://github.com/nikishubin/Notebook but its does not work

OpenJDK 64-Bit Server VM warning: Options -Xverify:none and -noverify were deprecated in JDK 13 and will likely be removed in a future release.
    Exception in thread "main" java.lang.ClassCastException: class jdk.internal.loader.ClassLoaders$AppClassLoader cannot be cast to class java.net.URLClassLoader (jdk.internal.loader.ClassLoaders$AppClassLoader and java.net.URLClassLoader are in module java.base of loader 'bootstrap')
        at org.springframework.boot.devtools.restart.DefaultRestartInitializer.getUrls(DefaultRestartInitializer.java:93)
        at org.springframework.boot.devtools.restart.DefaultRestartInitializer.getInitialUrls(DefaultRestartInitializer.java:56)
        at org.springframework.boot.devtools.restart.Restarter.<init>(Restarter.java:140)
        at org.springframework.boot.devtools.restart.Restarter.initialize(Restarter.java:546)
        at org.springframework.boot.devtools.restart.RestartApplicationListener.onApplicationStartingEvent(RestartApplicationListener.java:67)
        at org.springframework.boot.devtools.restart.RestartApplicationListener.onApplicationEvent(RestartApplicationListener.java:45)
        at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
        at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
        at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
        at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:122)
        at org.springframework.boot.context.event.EventPublishingRunListener.starting(EventPublishingRunListener.java:69)
        at org.springframework.boot.SpringApplicationRunListeners.starting(SpringApplicationRunListeners.java:48)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:292)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107)
        at org.surplus.radolf.Notebook.NotebookApplication.main(NotebookApplication.java:10)
    
    Process finished with exit code 1

my main class

package org.surplus.radolf.Notebook;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;


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

Answer 1

From the pom file its noted that java 1.8 is refered can you can you please check java 1.8 is in your system path varibale or later version. if later please use 1.8 and try to run the program.

Answer 2

If Java is 1.8, then check parent should match the release of the STS tools you ar using (ie) Groupid and artifact and version

Answer 3

An alternative to installing Java 8 is to use your IDE's built in JDK.

In InteliJ, you can go to Tools tab:

Click on 'Edit Configurations'

And select java 8