Skip to main content

LMAppletserver in Glassfish

LMAppletserver is a toolkit for automatic deployment of java classes (or jars) to your browser, and an rpc library for easily calling methods on the server. The intention is to enable effective code reuse between the client and the server, and not have to repackage the classes for the client. Also a way of calling server methods - that is to give the feeling of coding "directly on the server".

Download the example project from sourceforge.net:

http://sourceforge.net/project/downloading.php?group_id=142974&use_mirror=osdn&filename=SimplestLMAppletserverProject.zip&2731151

unzip SimplestLMAppletserverProject.zip

cd SimplestLMAppletserverProject

ant

To deploy the application to Glassfish:

asadmin deploydir simplelmapp.war

Open in your browser:

http://localhost:8080/simplelmapp/

And see the hello world applet...

The applet shows a message that is obtained by calling a business method on the server, using the RPC features of LMAppletserver. This is what happens in the applet:

HelloWorldBeanIF helloObj = (HelloWorldBeanIF)AppletServiceClientProxy.newInstance(HelloWorldBeanIF.class);
add(new JLabel(helloObj.sayHello()));

And on the server:

public class HelloWorldBean implements HelloWorldBeanIF {

public String sayHello() {
return "Hello world!";
}

}

See? Calling server methods using LMAppletServer clients is really simple .. :)

Comments

Popular posts from this blog

My VNC based development environment with Visual Studio Code running on Ubuntu

I've used this setup for my development environment for several years - giving me a developer desktop I can access anywhere. Even from my mobile phone. I've been fixing bugs, writing code and deployed emergency fixes from the bus, train and mountain tops. The setup is based on a lightweight desktop environment. There are lot of alternatives, but I've chosen fluxbox. From a plain AWS Amazon Ubuntu 16.04 ec2 instance I've started like this: sudo apt-get update sudo apt-get install fluxbox Download and extract tigervnc from https://github.com/TigerVNC/tigervnc/releases (I downloaded the binary file from https://bintray.com/tigervnc/stable/tigervnc/1.7.0 named tigervnc-1.7.0.x86_64.tar.gz ) then extract: tar -xvzf tigervnc-1.7.0.x86_64.tar.gz You need to install: sudo apt-get install x11-xkb-utils You need to edit .vnc/xstartup: nano .vnc/xstartup last line replace "twm &" with: fluxbox & Then you can start the

Angular components not reloading on route change

Spent a long time wondering why route changes caused strange effects on my component, and found out that it was because my component wasn't reloading at all. I had this assumption that when a route parameter changed (e.g. /projects/1 changed to /projects/2 ) the component for the route would be reloaded. But this is not the default behaviour of the Angular router. The default behaviour of the Angular router is to reuse the route if the configuration is the same (and not reload the component). But we can override this by providing a RouteReuseStrategy to our @NgModule: providers: [ { provide: RouteReuseStrategy, useClass: AARouteReuseStrategy } ] The full custom implementation of the RouteReuseStrategy will then be like this (and it's the shouldReuseRoute method that changes the behaviour so that the component is reloaded on route parameter change): export class AARouteReuseStrategy extends RouteReuseStrategy { shouldDetach(route: ActivatedRou

Intercepting and adjusting SQL generated by Eclipselink JPA

In some cases it might be useful to intercept and adjust the SQL generated by EclipseLink JPA. E.g. if you want to force an index in mysql you need to append force index (myindex) to the table name. If you create a query on the entitymanager: Query q = em.createQuery("select e from MyEntity"); you can cast it to the EclipseLink JpaQuery: JpaQuery jq = (JpaQuery)q; and the JpaQuery gives you access to the EclipseLink DataBaseQuery where you can prepare it before executing it: DatabaseQuery dbQuery = q.getDatabaseQuery(); dbQuery.prepareCall(((org.eclipse.persistence.jpa.JpaEntityManager)em).getActiveSession(),new DatabaseRecord()); You can now get the sql string and add the forced index: dbQuery.setSQLString(dbQuery.getSQLString()+" force index (myindex)"); and finally you can get the resultset using q.getResultList(). If you have parameters in the sql it's a bit more to it. Currently I've only found one option - probably not optimal since the query is transl