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Chapter 1 Introduction 5
Resource Limitations
Hardware resources on test devices are often limited. Resource constrained devices
can quit operation when excess native resources are requested. The Framework can
run tests on resource constrained target devices with limited available memory and
persistent storage. When developing test suites for the Java ME technology device,
the developer must be aware of device limitations such as the following and use the
appropriate Framework resources:
■ Memory constraints of the device
■ Minimum requirements listed in the appropriate specification for profiles
■ Maximum number of connections (HTTP, SSL, or Socket TCP/IP) on the
networking subsystem that can be open at any one time
■ Graphics and image subsystem limits
CLDC Target Device
The CLDC configuration provides a Java platform for network-connected devices
that have limited processing power, memory, and graphical capability (such as,
cellular phones, pagers, low-end personal organizers, and machine-to-machine
equipment). CLDC can also be deployed in home appliances, TV set-top boxes, and
point-of-sale terminals.
CLDC target devices typically have the following capabilities:
■ A 16-bit or 32-bit processor with a minimum clock speed of 16 megahertz
■ At least 160 kilobytes of non-volatile memory allocated for the CLDC libraries
and virtual machine
■ At least 192 kilobytes of total memory available for the Java platform
■ Low power consumption, often operating on battery power
■ Connectivity to a network, often through an intermittent wireless connection with
limited bandwidth
CDC Target Device
The CDC configuration provides a Java platform for network-connected consumer
and embedded devices, including smart communicators, pagers, high-end PDAs,
and set-top boxes.
CDC target devices typically have the following capabilities:
■ A 32-bit microprocessor or controller
■ 2 megabytes of RAM available to the Java application environment
■ 2.5 megabytes of ROM available to the Java application environment