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CEE-J -- the Compatible Execution Environment for Java
[Vendor: Skelmir LLC]

CEE-J, the Compatible Execution Environment for Java is Skelmir's suite of fast, compact and proven virtual machines for Java for embedded devices. CEE-J configurations include J2ME CLDC, MIDP, Embedded and PersonalJava(tm). Real Time Java extensions, bytecode compilers, remote debugging and profiling tools are also available. With CEE-J, enabling the use of Java on almost any device is now possible. CEE-J makes using Java practical on devices as resource constrained as industrial controllers, cell phones and PDAs to set-top boxes, internet appliances and more.

Skelmir provides world-class embedded clean-room solutions for running Java applications on a variety of platforms and devices. Skelmir's embedded virtual machine and related libraries and tools for Java provide you with the technology necessary for quick and reliable development and deployment of your Java enabled devices. Skelmir offers flexible licensing terms, including both royalty and royalty-free options.

Features

The modular design and overall architecture make porting CEE-J to new target platforms a relatively easy undertaking. CEE-J runs on numerous operating systems including Linux, ATI Nucleus, Win32, WinCE, Solaris, ChorusOS, and pSOS. CPUs supported include PPC, ARM/StrongARM, XScale, x86, 68k, SH3/4, MIPS, and MAP CA.

The CEE-J platform can scale from the smallest KVM-style VM to a full PersonalJava implementation. The current CEE-J configurations are . . .
  • J2ME CLDC (Connected Limited Device Configuration, a KVM-style VM)
  • J2ME MIDP (Mobile Information Device Profile, CLDC with graphics support)
  • Embedded Java (PersonalJava without AWT)
  • PersonalJava / JDK 1.1.8 (including AWT)
CEE-J supports JNI (Java Native Interface), allowing developers to mix Java and native methods. This can allow specific native functionality from the device to be exposed to Java. CEE-J also supports SNI (Skelmir Native Interface), a cleaner, more efficient way of writing native methods.

The Java Debugger Wire Protocol (JDWP) is a standard allowing third-party debuggers to debug Java code running on compliant VMs. CEE-J supports the JDWP standard. This enables full source level debugging of user programs from their favorite debugger/IDE.

In addition to high performance CPU-specific bytecode interpreters, CEE-J supports several compilation options. These are . . .
  • Dynamic Adaptive Recompiler. This is a lightweight, low memory usage alternative to a JIT.
  • Just-in-Time (JIT) compiler.
  • Ahead-of-Time (AOT) compiler. This runs on a development machine and creates a static or dynamic library for use on the target device.
CEE-J and Linux

CEE-J runs on the MontaVista, RedHat, and Lineo Embedix distributions as well as several custom Linux distributions. It supports ARM/StrongARM, PPC, and x86 on Linux and SH4 and MIPS ports are planned. CEE-J is particularly suited to embedded Linux as its AWT implementation draws directly to the framebuffer and does not require X11.

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