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  1.  
  2. import java.io.IOException;
  3. import java.nio.file.Paths;
  4. import java.net.URL;
  5. import java.net.URLClassLoader;
  6.  
  7. public class Main {
  8.     public static void main(String[] args) throws IOException, InterruptedException {
  9.         if(args.length == 0) {
  10.             new ProcessBuilder(
  11.                 Paths.get(System.getProperty("java.home"), "bin", "java").toString(),
  12.                 "-cp", System.getProperty("java.class.path"),
  13.                 "-Djava.system.class.loader=" + DynamicClassLoader.class.getName(),
  14.                 Main.class.getName(), "sub-process"
  15.             ).inheritIO().start().waitFor();
  16.             return;
  17.         }
  18.         System.out.println("Java: " + Runtime.version());
  19.         System.out.println("Main.main()");
  20.         System.out.println("ClassLoader.getSystemClassLoader(): " + ClassLoader.getSystemClassLoader());
  21.     }
  22.  
  23.     public static final class DynamicClassLoader extends URLClassLoader {
  24.         public DynamicClassLoader(URL[] urls, ClassLoader parent) {
  25.             super(urls, parent);
  26.         }
  27.  
  28.         public DynamicClassLoader(String name, ClassLoader parent) {
  29.             super(name, new URL[0], parent);
  30.         }
  31.  
  32.         public DynamicClassLoader(ClassLoader parent) {
  33.             this("classpath", parent);
  34.         }
  35.  
  36.         public void addURL(URL url) {
  37.             super.addURL(url);
  38.         }
  39.     }
  40. }
Success #stdin #stdout #stderr 0.26s 57048KB
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stdin
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Standard input is empty
stdout
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Java: 12.0.1+12
Main.main()
ClassLoader.getSystemClassLoader(): Main$DynamicClassLoader@2ff4acd0
stderr
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OpenJDK 64-Bit Server VM warning: Archived non-system classes are disabled because the java.system.class.loader property is specified (value = "Main$DynamicClassLoader"). To use archived non-system classes, this property must not be set
https://ideone.com/dJy18T
language:
Java (HotSpot 12)
created:
4 years ago
visibility:
public

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