Download Beginning J2ME platform: from novice to professional by Sing Li; Jonathan Knudsen PDF

By Sing Li; Jonathan Knudsen

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2. On the device, the second step of verification is performed as classes are loaded. If a class file has not been preverified, it is rejected. The MIDP reference implementation and the J2ME Wireless Toolkit contain a tool called preverify that performs the first step. The preverify tools takes, as input, a class file. It produces a preverified class file. You need to specify a classpath so that the tool can find the class you want to preverify as well as any referenced classes. Finally, you can specify an output directory using the -d option.

Somewhere off the device, a preverify step is performed. The device itself is only required to do a lightweight second verification step before loading classes. If you are using the J2ME Wireless Toolkit, you don’t have to worry about preverifying class files, and you may not even notice that it’s happening when you click the Build button. If you’d like to understand more about preverifying, read the rest of this section. Otherwise, you can just skip ahead. As you may recall, bytecode verification is one of the foundation stones of Java’s runtime security model.

Io are basically the same in the MIDP as they are in J2SE. microedition hierarchy) is not terribly difficult, as you’ll see in the remainder of this book. The actual development process, however, is a little more complicated for MIDlets than it is for J2SE applications. Beyond a basic compile-and-run cycle, MIDlets require some additional tweaking and packaging. The complete build cycle looks like this: Edit Source Code ➤ Compile ➤ Preverify ➤ Package ➤ Test or Deploy. To show how things work, and to give you a taste of MIDlet development, this chapter is dedicated to building and running a simple MIDlet.

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