classloading

问题 How can I identify java classes which will be used in a java *.class file by parsing the compiled *.class file? Thanks in advance. 来源： https://stackoverflow.com/questions/65285705/how-can-i-identify-classes-which-will-be-used-in-java-class-file

问题 All the documentation I've been able to find mentions the 'jre/lib/ext' folder but such does not exist on my JRE 13 installation. I guess somewhere between Java 8 (where I can see the jars in jre/lib/ext) and Java 13, they moved but I've been unable to pinpoint when and how it was done. Could someone please elaborate what's going on with new JRE's, in terms of where the extension classes reside currently? 回答1: The extension mechanism is gone with Java 9, not only moved [:-| , see the

问题 All the documentation I've been able to find mentions the 'jre/lib/ext' folder but such does not exist on my JRE 13 installation. I guess somewhere between Java 8 (where I can see the jars in jre/lib/ext) and Java 13, they moved but I've been unable to pinpoint when and how it was done. Could someone please elaborate what's going on with new JRE's, in terms of where the extension classes reside currently? 回答1: The extension mechanism is gone with Java 9, not only moved [:-| , see the

问题 I have a jar file foobar.jar containing the following two classes: public class Foo { public static void main(String[] args) { System.out.println("Foo"); } } The other class looks like this: import javax.batch.api.chunk.ItemProcessor; public class Bar implements ItemProcessor { public static void main(String[] args) { System.out.println("Bar"); } @Override public Object processItem(Object item) throws Exception { return item; } } If I execute the program using the following command, the

问题 I made a java agent with bytebuddy. It works well untill target application load classes form uRLConnection.getInputStream. The target app works well without attachment the agent, but shows exception [java.lang.ClassNotFoundException] when the agent attached. this is app's classloading line. return this.getClass().getClassLoader().loadClass(string) //string points the name of a byte array. In the application, the classes is provided in the form of byte array from the uRLConnection

问题 As per java doc, static block is executed when the class is initialized. Could anyone please tell me why static block is not executed when I run below code? class A { static { System.out.println("Static Block"); } } public class Main { public static void example1() { Class<?> class1 = A.class; System.out.println(class1); } public static void example2() { try { Class<?> class1 = Class.forName("ClassLoading_Interview_Example.ex1.A"); System.out.println(class1); }catch(Exception e) { e