Example Code: CORBA

JDK and JInitiator Applets

README

For all oracle clients, you need to set the following in the
environment before creating InitialContext
    env.put(ServiceCtx.APPLET_CLASS, this);// This referes to the applet class

In the HTML file itself, you need to set
ORBdisableLocator=true, for all versions. In addition, if you are using
JDK 1.2 (i.e, plug in 1.2), then you also need to set the following in the
HTML file.
<PARAM NAME="org.omg.CORBA.ORBClass" VALUE="com.visigenic.vbroker.orb.ORB">
<PARAM NAME="org.omg.CORBA.ORBSingletonClass" VALUE="com.visigenic.vbroker.orb.O
RB">

The syntax slightly differs from plugin to plugin. Look at the example applets
in this diretory.

Note that you don't need to copy any jars on to the client machine. But if you
do wish to copy the jar files to the client machine, also set "ClassLoader" to 
the appletClassLoader (this.getClass().getClassLoader()) and things will
work fine. You also don't need to change any files (like java.security etc.) on
the client.

HTML for JDK 1.1

<pre>
<html>
<title> CORBA Applet talking to 8i</title>
<h1> CORBA applet talking to 8i using java plug in 1.1  </h1>
<hr>
The good old bank example
<OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
WIDTH = 500 HEIGHT = 50  codebase="http://java.sun.com/products/plugin/1.1/jinst
all-11-win32.cab#Version=1,1,0,0">
<PARAM NAME = CODE VALUE = OracleClientApplet.class >
<PARAM NAME = ARCHIVE VALUE = "oracleClient.jar,aurora_client.jar,vbjorb.jar,vbj
app.jar" >
<PARAM NAME="type" VALUE="application/x-java-applet;version=1.1">
<PARAM NAME="ORBdisableLocator" VALUE="true">
<COMMENT>
<EMBED type="application/x-java-applet;version=1.1"
ORBdisableLocator="true" java_CODE = OracleClientApplet.class java_ARCHIVE = "or
acleClient.jar,aurora_client.jar,vbjorb.jar,vbjapp.jar" WIDTH = 500 HEIGHT = 50
  pluginspage="http://java.sun.com/products/plugin/1.1/plugin-install.html">
<NOEMBED></COMMENT>
</NOEMBED></EMBED>
</OBJECT>

</center>
<hr>
</pre>

HTML for JDK 1.2

<pre>
<html>
<title> CORBA applet talking to 8i</title>
<h1> CORBA applet talking to 8i using Java plug in 1.2 </h1>
<hr>
The good old bank example
<OBJECT classid="clsid:8AD9C840-044E-11D1-B3E9-00805F499D93"
WIDTH = 500 HEIGHT = 50  codebase="http://java.sun.com/products/plugin/1.2/jinst
all-11-win32.cab#Version=1,1,0,0">
<PARAM NAME = CODE VALUE = OracleClientApplet.class >
<PARAM NAME = ARCHIVE VALUE = "oracleClient.jar,aurora_client.jar,vbjorb.jar,vbj
app.jar" >
<PARAM NAME="type" VALUE="application/x-java-applet;version=1.1.2">
<PARAM NAME="ORBdisableLocator" VALUE="true">
<PARAM NAME="org.omg.CORBA.ORBClass" VALUE="com.visigenic.vbroker.orb.ORB">
<PARAM NAME="org.omg.CORBA.ORBSingletonClass" VALUE="com.visigenic.vbroker.orb.O
RB">
<COMMENT>
<EMBED type="application/x-java-applet;version=1.1.2"
ORBdisableLocator="true"
org.omg.CORBA.ORBClass="com.visigenic.vbroker.orb.ORB"
org.omg.CORBA.ORBSingletonClass="com.visigenic.vbroker.orb.ORB" java_CODE = Orac
leClientApplet.class java_ARCHIVE = "oracleClient.jar,aurora_client.jar,vbjorb.j
ar,vbjapp.jar" WIDTH = 500 HEIGHT = 50   pluginspage="http://java.sun.com/produc
ts/plugin/1.2/plugin-install.html">
<NOEMBED></COMMENT>
</NOEMBED></EMBED>
</OBJECT>

</center>
<hr>
</pre>

HTML for Oracle JInitiator

<h1>CORBA applet talking to 8i using JInitiator 1.1.7.18</h1>
   <COMMENT>
   <EMBED   type="application/x-jinit-applet;version=1.1.7.18"
      java_CODE="OracleClientApplet"
      java_CODEBASE="http://mysun:8080/applets/bank"
      java_ARCHIVE="oracleClient.jar,aurora_client.jar,vbjorb.jar,vbjapp.jar"
      WIDTH=400
      HEIGHT=100
      ORBdisableLocator="true"
      org.omg.CORBA.ORBClass="com.visigenic.vbroker.orb.ORB"
      org.omg.CORBA.ORBSingletonClass="com.visigenic.vbroker.orb.ORB"
      serverHost="mysun"
      serverPort=8080
      <NOEMBED>
      </COMMENT>
      </NOEMBED>
    </EMBED>

Applet Client

// ClientApplet.java

import java.awt.*;

import oracle.aurora.jndi.sess_iiop.ServiceCtx;

import javax.naming.Context;
import javax.naming.InitialContext;
import java.util.Hashtable;
import Bank.*;

public class OracleClientApplet extends java.applet.Applet {

  private TextField _nameField, _balanceField;
  private Button _checkBalance;
  private Bank.AccountManager _manager;

  public void init() {
    // This GUI uses a 2 by 2 grid of widgets.
    setLayout(new GridLayout(2, 2, 5, 5));
    // Add the four widgets.
    add(new Label("Account Name"));
    add(_nameField = new TextField());
    add(_checkBalance = new Button("Check Balance"));
    add(_balanceField = new TextField());
    // make the balance text field non-editable.
    _balanceField.setEditable(false);
    try {
      String serviceURL = "sess_iiop://mysun:2222";
      String objectName = "/test/myBank";

      // Initialize the ORB (using the Applet).
      Hashtable env = new Hashtable();
      env.put(Context.URL_PKG_PREFIXES, "oracle.aurora.jndi");
      env.put(Context.SECURITY_PRINCIPAL, "scott");
      env.put(Context.SECURITY_CREDENTIALS, "tiger");
      env.put(Context.SECURITY_AUTHENTICATION, ServiceCtx.NON_SSL_LOGIN);
      env.put(ServiceCtx.APPLET_CLASS, this);
      
      Context ic = new InitialContext(env);
    _manager = (AccountManager)ic.lookup (serviceURL + objectName);
    } catch (Exception e) {
      System.out.println(e.getMessage());
      e.printStackTrace();
      throw new RuntimeException();
    }
  }

  public boolean action(Event ev, Object arg) {
    if(ev.target == _checkBalance) {
      // Request the account manager to open a named account.
      // Get the account name from the name text widget.
      Bank.Account account = _manager.open(_nameField.getText());
      // Set the balance text widget to the account's balance.
      _balanceField.setText(Float.toString(account.balance()));
      return true;
    }
    return false;
  }

}