Location of javaagent jar in bootclasspath 规格严格

String urlString = ClassLoader.getSystemClassLoader().getResource("com/my/package/MyClass.class").toString(); 
 
urlString = urlString.substring(urlString.indexOf("file:"), urlString.indexOf('!')); 
URL url = new URL(urlString); 
File file = new File(url.toURI()); 
System.out.println(file); 
System.out.println(file.exists()); 

final String   bootClassPath; 
final String[] entries; 
 
// different VM may use a different string here... 
bootClassPath = System.getProperty("sun.boot.class.path"); 
entries       = bootClassPath.split(File.pathSeparator); 
 
for(final String entry : entries) 
{ 
    System.out.println(entry); 
} 

RuntimeMXBean.getBootClassPath