Attribute codebase specifies the base URL of the applet – the directory that contains the applet’s code. It is used while searching jar files in archive attribute, in such a way that all jars in archive attribute are searched relative to codebase. So. When you use archive=”http://myurl.com/archive/myjar.jar” and codebase=”http://myurl.com/classes” together it means: find “http://myurl.com/archive/myjar.jar“ in … Read more
After reading Java 7 Update 21 Security Improvements in Detail mention.. With the introduced changes it is most likely that no end-user is able to run your application when they are either self-signed or unsigned. ..I was wondering how this would go for loose class files – the ‘simplest’ applets of all. Local file system … Read more
Yes, 0xCAFEBABE is the usual first 4 bytes of a Java file. 1008813135 is <!DO in Latin encoding, which is, in all probability, the start of <!DOCTYPE…. It is therefore likely the start of a 404 error, or some other error page.
For every client you need to start separate thread. Example: public class ThreadedEchoServer { static final int PORT = 1978; public static void main(String args[]) { ServerSocket serverSocket = null; Socket socket = null; try { serverSocket = new ServerSocket(PORT); } catch (IOException e) { e.printStackTrace(); } while (true) { try { socket = serverSocket.accept(); … Read more
Applets were very popular a couple of years ago, but now the browser world changed and security is becoming a major focus for all major browser vendors. The Java team gave its complete set or reasons, alternatives etc. in the document Migrating from Java Applets to plugin-free Java technologies. On page 4, there is the … Read more
A hybrid applet/application simply abstracts the initialization of two top-level containers, JFrame and JApplet. Examples are seen here, here and here. Addendum: How does that work? The first example exposes a factory method, createGUI(), and it adds the returned panel to the extant top-level container. The second provides a static initContainer() method, passing the enclosing … Read more
The issue is because of Java version mismatch. Referring to the JVM specification the following are the major versions of classfiles for use with different versions of Java. (As of now, all versions support all previous versions.) Java SE version Major version 1.0.2 45 1.1 45 (Not a typo, same version) 1.2 46 1.3 47 … Read more