J2ME CDC(Connected Device Configuration，连接式设备配置集)使用CVM，面向那些具有更强计算能力的嵌入式设备，包含了Java类库的核心部分，是应用Java技术在嵌入式设备上进行开发所需类库的最小集合。它具有如下优点：高级网络特性：CDC位基于套接字的网络编程技术提供了最新Java API满足Jini技术的需求：基于CDC远程方法调用(RMI)可选包可实现对基于完全Jini技术的设备支持。方便的移植：CDC的Foundation Profile(基础描述集)核心类库包括了广为使用的java.lang、java.net、java.io、java.util、java.security和java.text包清除了deprecated方法：程序更安全、易于理解可以利用更高级的包进行扩展，比如说Personal Basis Profile(PBP个人基础描述集)和Personal Profile(PP个人描述集)等。CDC向小型设备展现了大量的Java 2技术，与Jini技术的结合提高了设备的灵活性，以及能够不断进化发展的能力，实现即插即用，分布计算等等。CDC对资源的要求：内存：2MB ROM、512KB RAM处理器：32位CPU网络连接能力：至少支持UDP，附加的profile可添加对TCP/IP的完全支持用户界面：没有支持图形用户的GUI，可添加描述集实现。

一、选用sun的phoneme

https://phoneme.dev.java.net/

二、下载

http://download.java.net/mobileembedded/phoneme/advanced/phoneme_advanced-mr2-dev-src-b97-20_nov_2008.zip

三、解压

unzip phoneme_advanced-mr2-dev-src-b97-20_nov_2008.zip

四、修改makefile

cd phoneme_advanced_mr2/cdc/build/linux-arm-generic

gedit GNUmakefile

修改 CVM_TARGET_TOOLS_PREFIX=/usr/local/arm/4.3.2/bin/arm-linux- 为自己的交叉编译器的地址

修改 USE_AAPCS ?= false 为 true

五、输出PATH

export PATH=/usr/local/arm/4.3.2/bin/:$PATH                     为自己的交叉编译器的地址

六、编译

make

七、如果是使用ubuntu的朋友，可能要安装sun-java6-jdk和另外的一两个工具

Java SDK安装配置

http://wiki.ubuntu.org.cn/Java%E5%AE%89%E8%A3%85%E9%85%8D%E7%BD%AE

另外的一两个工具可以通过 apt-get install 来安装(出错时会提醒的了，具体我忘了，没有记录)

八、出错

../../src/linux-arm/javavm/runtime/segvhandler_arch.c:45:26: error: asm/ucontext.h: No such file or directory

../../src/linux-arm/javavm/runtime/segvhandler_arch.c:In function 'handleSegv':   ../../src/linux-arm/javavm/runtime/segvhandler_arch.c:224: error: dereferencing pointer to incomplete type

../../src/linux-arm/javavm/runtime/segvhandler_arch.c:285: error: dereferencing pointer to incomplete type

../../src/linux-arm/javavm/runtime/segvhandler_arch.c:285: error: dereferencing pointer to incomplete type

../../src/linux-arm/javavm/runtime/segvhandler_arch.c:286: error: dereferencing pointer to incomplete type

../../src/linux-arm/javavm/runtime/segvhandler_arch.c:294: error: dereferencing pointer to incomplete type

修改 segvhandler_arch.c 文件

gedit ../../src/linux-arm/javavm/runtime/segvhandler_arch.c

修改

#define ucontext asm_ucontext

#include

为

//#define ucontext asm_ucontext     //注释掉这句

#include             //去掉arm/

九、编译

make

编译成功！

ls

可以看到在当前目录有

bin   lib   testclasses.zip

十、测试

1)、拷贝上面三个文件与文件夹到开发板/home/j2me目录

2)、在开发板/etc/init.d/rcS文件里加入如下

JAVA_HOME=/home/j2me

export PATH=$JAVA_HOME/bin:$PATH

export CLASSPATH=.:$JAVA_HOME/lib

3)、经典的HelloWorld

cd /home/j2me/bin

./cvm -cp ../testclasses HelloWorld

可以看到输出了 HelloWorld.

4)、来个全面测试

./cvm -cp ../testclasses.zip Test

*Number of command line arguments: 0

Starting test1

...recurse

...recurse

...recurse

...link

...link

...link

Starting test1 again

...recurse

...recurse

...recurse

...link

...link

...link

test6: Caught inner java.lang.NullPointerException

test6: Caught outer java.lang.NullPointerException

Testing Array Copy

*TestE exception thrown because "I'm feeling Testy"

* threw java.lang.ExceptionInInitializerError

* threw java.lang.NoClassDefFoundError: StaticE

c1 = class [LTest;

c2 = class [[LTest;

c3 = class [LC;

c4 = class [[LC;

c1.modifiers = 1041

c2.modifiers = 1041

c3.modifiers = 1040

c4.modifiers = 1040

*FloatMIN =1.4E-45

*FloatMAX =3.4028235E38

FloatMIN (the int bits) =1

FloatMAX (the int bits) =2139095039

java.lang.IllegalArgumentException: too many dimensions

at java.lang.reflect.Array.multiNewArray(Native Method)

at java.lang.reflect.Array.newInstance(Unknown Source)

at Test.testDeepArrayConstruction(Unknown Source)

at Test.main(Unknown Source)

at sun.misc.CVM.runMain(Unknown Source)

Constructed an object of type

[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[LTest;

finally!

Requesting GC with a latency request of 2 seconds

(Turning GC tracing on)

Sleeping 5 seconds, and waiting for GC's

Woke up! Cancelling latency request

.............

*CONGRATULATIONS: test Test completed with 411 tests passed and 0 failures

*Output lines starting with a * should be checked for correctness

*They can be compared to src/share/javavm/test/TestExpectedResult

*CONGRATULATIONS: test Test completed with 411 tests passed and 0 failures

这句话意味着什么，我就不说了～～ 恭喜你！

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我的补充：

GNUmakefile里有两个USE_AAPCS ，都要改成false

否则运行时报

Java VM panic: AAPCS calling convention used; compilation must use -DAAPCS