java?version?
"
1.5.0
"
JamVM?version?
1.5
.
4
Copyright?(C)?
2003
-
2010
?Robert?Lougher?
<
rob@jamvm.org.uk
>
This?program?
is
?free?software;?you?can?redistribute?it?
and
/
or
modify?it?under?the?terms?of?the?GNU?General?
Public
?License
as
?published?by?the?Free?Software?Foundation;?either?version?
2
,
or
?(at?your?
option
)?any?later?version.
This?program?
is
?distributed?in?the?hope?that?it?will?be?useful,
but?WITHOUT?ANY?WARRANTY;?without?even?the?implied?warranty?of
MERCHANTABILITY?
or
?FITNESS?
FOR
?A?PARTICULAR?PURPOSE.??See?the
GNU?General?
Public
?License?
for
?more?details.
Build?information:
Execution?Engine:?direct
-
threaded?interpreter?
with
?stack
-
caching
Compiled?
with
:?gcc?
4.6
.
2
?
20110630
?(prerelease)
Boot?Library?Path:?
/
usr
/
classpath
/
lib
/
classpath
Boot?Class?Path:?
/
usr
/
jamvm
/
share
/
jamvm
/
classes.zip:
/
usr
/
classpath
/
share
/
classpath
/
glibj.zip
交叉編譯環境前提已經搭建好
各個軟件版本及下載地址：
?????? GNU Classpath 0.98? http://www.gnu.org/software/classpath/downloads/downloads.html
?????? JVM 1.54? https://sourceforge.net/projects/jamvm/files/jamvm/
?????? zlib? 1.2.11 http://www.zlib.net/
?????? libffi 3.2 ftp://sourceware.org/pub/libffi/
編譯過程：
?一、編譯gnu classpath
???????? 前提：
???????? 1、在/usr下創建classpath文件夾，并賦予權限 ：sudo chmod 777 /usr/classpath -R
???????? 2、將文件解壓并將文件夾賦予權限 sudo chmod 777 ~/software/classpath-0.98 -R
???????? 編譯安裝：
???????? 1、./configure --prefix=/usr/javatools --host=arm-none-linux-gnueabi
--disable-examples --without-x --disable-qt-peer --disable-gtk-peer
--disable-gconf-peer --disable-plugin --disable-alsa --disable-dssi
--disable-Werror --disable-tools
?????????
????????? 說明：直接執行，會報錯conditional "GCJ_JAVAC" was never defined.
?????????? 根據百度的結果，解決方式是假設GCJ
沒有定義，但是它也沒有用到過，則就在.configure文件中把那個if判斷用#屏蔽了???????? 2、make & make install
?
二、編譯zlib
???????? 前提：
????????? 1、在/usr下創建zlib文件夾，并賦予權限：sudo chmod 777 /usr/zlib -R
????????? 2、將文件解壓并將文件夾賦予權限：sudo chmod 777 ~/software/zlib-1.2.11 -R
????????? 編譯安裝：
????????? 1、
??????????????? export CC=arm-linux-gcc
??????????????? ./configure --prefix=/usr/zlib
?????????? 2、make & make install
三、編譯libffi
???????? 前提：
????????? 1、將libffi同樣安裝在/usr/zlib文件夾下
????????? 2、將文件解壓并將文件夾賦予權限：sudo chmod 777 ~/software/libffi-3.2 -R
????????? 編譯安裝：
????????? 1、./configure --prefix=/usr/zlib --host=arm-none-linux-gnueabi
????????? 2、make & make install
????????? 拷貝文件：
???? 將/usr/zlib/lib/libffi-3.2/include/
?將里面的ffi.h ffitarget.h
復制到/usr/zlib/include中。
四、編譯jvm??????????
???????? 前提：
????????? 1、在/usr下創建jamvm文件夾，并賦予權限：sudo chmod 777 /usr/jamvm -R
????????? 2、將文件解壓并將文件夾賦予權限：sudo chmod 777 ~/software/jamvm-1.54 -R
????????? 編譯安裝：
????????? 1、./configure --prefix=/usr/jamvm --with-classpath-install-dir=/usr/classpath --enable-ffi --disable-int-inlining --host=arm-none-linux-gnueabi CFLAGS=-I/usr/zlib/include LDFLAGS=-L/usr/zlib/lib
?????????? 2、make & make install
安裝到開發板并配置環境變量
????????? 1、
將classpath和jamvm兩個文件夾復制到開發板的
/usr目錄下面
???? 2、將zlib/lib中的所有文件夾和文件拷貝到開發板的/usr/lib/目錄下面
???? 3、配置環境變量
?????????? export PATH=$PATH:/usr/jamvm/bin
?????????????????????? jamvm -version
打印版本信息如下：
java?version?"1.5.0"
JamVM?version?1.5.4
Copyright?(C)?2003-2010?Robert?Lougher?<rob@jamvm.org.uk>
This?program?is?free?software;?you?can?redistribute?it?and/or
modify?it?under?the?terms?of?the?GNU?General?Public?License
as?published?by?the?Free?Software?Foundation;?either?version?2,
or?(at?your?option)?any?later?version.
This?program?is?distributed?in?the?hope?that?it?will?be?useful,
but?WITHOUT?ANY?WARRANTY;?without?even?the?implied?warranty?of
MERCHANTABILITY?or?FITNESS?FOR?A?PARTICULAR?PURPOSE.??See?the
GNU?General?Public?License?for?more?details.
Build?information:
Execution?Engine:?direct-threaded?interpreter?with?stack-caching
Compiled?with:?gcc?4.6.2?20110630?(prerelease)
Boot?Library?Path:?/usr/classpath/lib/classpath
Boot?Class?Path:?/usr/jamvm/share/jamvm/classes.zip:/usr/classpath/share/classpath/glibj.zip
?????????????????????? 將紅色部分設置到環境變量中：
????????????????????? export LD_LIBRARY_PATH=/usr/classpath/lib/classpath:$LD_LIBRARY_PATH
????????????????????? export ?BOOTCLASSPATH=/usr/jamvm/share/jamvm/classes.zip:/usr/classpath/share/classpath/glibj.zip
?????????????????????? 該命令可以每次都執行一次，也可以寫到開發板的啟動文件中，這樣就不用每次都手動執行。啟動文件不同開發板不一樣，自己去添加環境變量，此處不再敘述。
java程序：
?????
public?class?HelloWorld?{
????public?static?void?main(String[]?args){
????????System.out.println("Hello?World!");
????}
}
?????? 編譯 javac HelloWorld
?????? 將生成的HelloWorld.class拷貝到開發板上執行jamvm HelloWorld
?????? 打印Hello World!
遇到的問題：
??????? 1、執行config和make主要是三類問題，沒有執行權限，利用chmod 777 將文件夾所有權限賦值；缺少依賴庫，主要是zlib和ffi，下載安裝即可；config配置錯誤，按照當前的沒有問題；
??????? 2、庫拷貝問題，zlib/lib庫未拷貝，會產生找不到lib庫的問題；
??????? 3、執行的時候還報如下錯誤，可能三種原因導致：環境變量設置錯誤；classpath和jamvm版本不正確；java程序的位置不對。
????????????????? Exceptionoccurred while VM initialising
?????????????????
Java/lang/NoClassDefFoundError: java/lang/Thread
??????? 4、之前試了classpath0.99和jamvm2.0.0，一直報第三個錯誤，直到變成當前的版本，坑啊！
??????? 5、java程序的位置不要定義包就好了。
??????????