Answers to Questions and Exercises: Doing More With Rich Internet Applications

Questions

1. Question: True or False: Rich Internet applications (RIAs) can set secure properties by prefixing the property name with "jnlp.".

   Answer: True: Rich Internet applications (RIAs) can set secure properties by prefixing the property name with "jnlp." or "javaws.".

2. Question: True or False: Only signed RIAs can use JNLP API to access files on the client.

   Answer: False: Unsigned RIAs can also use JNLP API to access files on the client.

Exercises

1. Exercise: To the following JNLP file, add a secure property called jnlp.foo and set its value to true.

   <?xml version="1.0" encoding="UTF-8"?>
   <jnlp spec="1.0+" codebase="" href="">
       <information>
           <title>Dynamic Tree Demo</title>
           <vendor>Dynamic Team</vendor>
   
       </information>
       <resources>
           <!-- Application Resources -->
           <j2se version="1.6+"
                 href="http://java.sun.com/products/autodl/j2se" />
           <jar href="DynamicTreeDemo.jar" main="true" />
       </resources>
       <applet-desc 
            name="Dynamic Tree Demo Applet"
            main-class="components.DynamicTreeApplet"
            width="300"
            height="300">
        </applet-desc>
        <update check="background"/>
   </jnlp>                           
   

   Answer:

   <?xml version="1.0" encoding="UTF-8"?>
   <jnlp spec="1.0+" codebase="" href="">
       <information>
           <title>Dynamic Tree Demo</title>
           <vendor>Dynamic Team</vendor>
   
       </information>
       <resources>
           <!-- Application Resources -->
           <j2se version="1.6+"
                 href="http://java.sun.com/products/autodl/j2se" />
           <jar href="DynamicTreeDemo.jar" main="true" />
           <property name="jnlp.foo" value="true"/>
       </resources>
       <applet-desc 
            name="Dynamic Tree Demo Applet"
            main-class="components.DynamicTreeApplet"
            width="300"
            height="300">
        </applet-desc>
        <update check="background"/>
   </jnlp>