Question: In a link that is to run a Java Web Start application, which file is specified as the
Answer: You use the application's
JNLP file name as the value of the
href attribute. When a user clicks the link to the
JNLP file, Java Web Start loads the application specified by that
Question: Which MIME type must a Web server recognize in order for it to host Java Web Start applications?
Answer: You must configure the Web server so that files with the .jnlp extension are set to the
application/x-java-jnlp-file MIME type.
Question: In an application's
JNLP file, which two elements must be specified within the
resources element must contain:
j2seelement, which specifies the Java platform on which to run the application.
jarelement, which specifies the JAR file for the application.
Question: Which interface provides the ability to an application to control how its own resources are cached?
Answer: B. The
DownloadService interface provides the ability to an application to control how its own resources are cached.
Question: True or False: Java Web Start applications run in a secure sandbox by default.
Question: True or False: If a Java Web Start application is running in a secure sandbox, JAR files for the application can reside on different servers.
Answer: False. All JAR files for the application must reside on the same server.
Question: For a Java Web Start application to support operations outside of the secure sandbox, what must you do with its JAR files?
Answer: You must sign JAR files to enable your application can work outside of the sandbox.
Exercise: Write the XML code you would add to a
JNLP file in order to request that the application have complete access to the client system.
<security> <all-permissions/> </security>
Exercise: For a Java Web Start application, you have two icons,
two.gif, in the
images directory in a JAR file. Write the application code you would use to access these images.
// Get current classloader ClassLoader cl = this.getClass().getClassLoader(); // Create icons Icon firstIcon = new ImageIcon(cl.getResource("images/one.gif")); Icon secondIcon = new ImageIcon(cl.getResource("images/two.gif"));