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.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./
二、下载
/mobileembedded/phoneme/advanced/phoneme_advanced-mr2-dev-src-b97-20_nov_.zip
三、解压
unzip phoneme_advanced-mr2-dev-src-b97-20_nov_.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/:$PATH 为自己的交叉编译器的地址
六、编译
make
七、如果是使用ubuntu的朋友，可能要安装sun-java6-jdk和另外的一两个工具
Java SDK安装配置
.cn/Java%E5%AE%89%E8%A3%85%E9%85%8D%E7%BD%AE
另外的一两个工具可以通过 apt-get install 来安装(出错时会提醒的了，具体我忘了，没有记录)
八、出错
../../src/linux-arm/javavm/runtime/segvhandler_arch.c:45:26: error: asm/ucontext.h: No such file or directory
../../src/linux-arm/javavm/runtime/segvhandler_arch.c:In function 'handleSegv': ../../src/linux-arm/javavm/runtime/segvhandler_arch.c:224: error: dereferencing pointer to incomplete type
../../src/linux-arm/javavm/runtime/segvhandler_arch.c:285: error: dereferencing pointer to incomplete type
../../src/linux-arm/javavm/runtime/segvhandler_arch.c:285: error: dereferencing pointer to incomplete type
../../src/linux-arm/javavm/runtime/segvhandler_arch.c:286: error: dereferencing pointer to incomplete type
../../src/linux-arm/javavm/runtime/segvhandler_arch.c:294: error: dereferencing pointer to incomplete type
修改 segvhandler_arch.c 文件
gedit ../../src/linux-arm/javavm/runtime/segvhandler_arch.c
修改
#define ucontext asm_ucontext
#include
为
//#define ucontext asm_ucontext //注释掉这句
#include //去掉arm/
九、编译
make
编译成功！
ls
可以看到在当前目录有
bin lib testclasses.zip
十、测试
1)、拷贝上面三个文件与文件夹到开发板/home/j2me目录
2)、在开发板/etc/init.d/rcS文件里加入如下
JAVA_HOME=/home/j2me
export PATH=$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
