classloader

I had a problem that I posted before but got no clear solution How to prevent JFrame from closing . So I am posting a SSCCE may be this might help in better understanding the problem being faced package myApp; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import javax.swing.JFrame; import App2.Applic2; public class MYApp { @SuppressWarnings({ "unchecked", "rawtypes" }) public static void main(String arg[]){ JFrame f = new JFrame(); f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); f.setTitle("Application frame 1"); f.setSize(200,200); f.setVisible(true);

import java.io.ByteArrayOutputStream; import java.io.File; import java.io.IOException; import java.io.InputStream; import java.util.jar.JarEntry; import java.util.jar.JarFile; public class JarClassLoader extends ClassLoader { private String path; public JarClassLoader(String path) { this.path = path; } @Override public Class<?> loadClass(String name, boolean resolve) throws ClassNotFoundException { Class<?> c = findLoadedClass(name); if (c == null) { try { c = findSystemClass(name); } catch (Exception e) { } if (c != null) return c; try { byte data[] = loadClassData(name); c = defineClass(name

I have a jar embedded in a bundle that needs to fetch a resource packaged with it like so: MyBundle -\ src -\lib -\MyEmbeddedJar -\src -\SomeClass -\someResource.xml I am trying to access 'someResource.xml' from 'SomeClass' like so: SomeClass.class.getResource( "someResource.xml" ); But I've had no luck. I've tried several variations with the CWD appended (eg: './someResource.xml') but I just can't get this resource to load. I know that the "right" way is to use Activator to get hooks back to the proper classloader, but the embedded jar can be used in other projects, so I'd hate to have to add

Here is the simplified version of the problem: SomeClass c = (SomeClass) obj.getSomeClassParent() not always but it happens sometimes to trigger exception org.somepackage.SomeClass can't be cast to org.somepackage.SomeClass How is this possible ? I suppose it has something to do with the fact that JAI imageio is native lib, but relay how can this happen ? I'm probably missing something but what ? I'm using JAI imageio version 1.1 dcm4che 2.0.21 DICOM lib Here is the original code ImageInputStream iis = ImageIO.createImageInputStream(src); Iterator<ImageReader> iter = ImageIO

I started to ask this question and then figured out the answer before submitting it. I've decided to post the question anyway so that other people who run into the same problem will be able to learn from my mistakes. I'm having a problem with an applet (a JApplet actually) unable to instantiate another class which is included in the same jar as the applet. The exception I'm seeing on the Java console is: Exception in thread "thread applet-com.company.program.cm.hmi.MediatorApplet-1" java.lang.NoClassDefFoundError: com/company/program/cm/cs/JDataStore at com.company.program.cm.hmi

I have legacy code I don't want to touch. public class LegacyCode{ public LegacyCode() { Service s = new ClassA(); s.getMessage(); } } Where ClassA provides a CORBA service call. public class ClassA implements Service{ @Override public String getMessage() { // Make CORBA service call... return "Class A"; } } And the interface Service looks like; public interface Service { String getMessage(); } For test purposes, I want to replace the implementation of Service (in LegacyCode implemented by ClassA ) with a stub. public class ClassB implements Service { @Override public String getMessage() {

Code: class A { static { System.out.println("loading A static 1"); } static { System.out.println("loading A static 2 B.c= "+B.c); } static { System.out.println("loading static 3"); } static int a=10; A(){ } } class B extends A{ static { System.out.println("loading B A.a= "+A.a); } static int c = 50; } public class Test { public static void main(String[] args) { new B(); } } Output: loading A static 1 loading A static 2 B.c= 0 loading static 3 loading B A.a= 10 From this out put can we say that the parent class loads after the child class but child class initialize after the parent class? If so