March 2002
Intermediate to advanced
480 pages
18h 40m
English
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Chapter 8. J2ME Command-Line Tools
J2ME developers have a range of visual environments to choose from when developing and debugging applications. Some of these have already been mentioned or will be covered in Chapter 9. In some cases, however, it is necessary to come to grips with the lower-level tools that lie behind these development environments. This chapter provides reference material for some of the command-line tools that developers are most likely to need to use.
cvm: The Connected Device Configuration Virtual Machine
Availability
CDC Reference Implementation, Foundation Profile Reference Implementation
Synopsis
cvm [options] [properties] classfile [args]
Description
CVM is a virtual machine that meets the requirements of the Connected Device Configuration specification. It provides all of the features required by the second edition of the Java Virtual Machine Specification and incorporates a garbage collector that is optimized for a small memory environment. In order to reduce startup time and memory overhead, the CVM usually has the core Java classes prelinked with it at build time using a process called ROMizing, which is also used by the CLDC virtual machine (KVM) and described in Section 2.4.1.
CVM is provided in source code form as part of the CDC and Foundation Profile reference implementations, which are supported on Linux and VxWorks.
Options
- -version
Displays version information and exits. Typical output from this command looks like this:
java version "J2ME Foundation ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.