標籤:style http io ar os java sp for strong
經過兩天的努力,總於在ubuntu以下編譯好classpath-0.98與jamvm1.5.4,並能成功的運行類檔案:jamvm hellowold,當螢幕上列印出“hello world!”的時候,按捺不住一陣興奮!在這兩天中,運行jamvm hellowold始終被有三類異常:
1) Exceptionoccurred while VM initialising
java/lang/NoClassDefFoundError: java/lang/Thread
2) Exception occured while printing exception(java/lang/NoClassDefFoundError)...
Original exception wasjava/lang/UnsatisfiedLinkError
3)segment fault
對於當中異常1), 2) 我猜測可能是classpath等路徑設錯,我通過baidu,google,bing等搜尋工具查詢國內外相關問題,得出一個解決方案是:
通過jamvm –version 命令查詢路徑資訊:
$ jamvm-version
javaversion "1.5.0"
JamVMversion 1.5.4
Copyright(C) 2003-2010 Robert Lougher <[email protected]>
Thisprogram is free software; you can redistribute it and/or
modify itunder the terms of the GNU General Public License
aspublished by the Free Software Foundation; either version 2,
or (atyour option) any later version.
Thisprogram is distributed in the hope that it will be useful,
butWITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITYor FITNESS FOR A PARTICULAR PURPOSE. Seethe
GNUGeneral Public License for more details.
Buildinformation:
ExecutionEngine: inline-threaded interpreter with stack-caching
Compiledwith: gcc 4.6.3
BootLibrary Path: /usr/local/classpath/lib/classpath
BootClass Path:
/usr/local/jamvm/share/jamvm/classes.zip:/usr/local/classpath/share/classpath/glibj.zip
在運行jamvm helloword之前須要設定兩個變數:
export LD_LIBRARY_PATH=/usr/local/classpath/lib/classpath:$LD_LIBRARY_PATH
export BOOTCLASSPATH=/usr/local/jamvm/share/jamvm/classes.zip:/usr/local/classpath/share/classpath/glibj.zip
可是我依照這樣的方法來設定兩個環境變數,還是解決不了問題;
關於異常3) 這個一定是jamvm本身的bug,除非單步調試,否則可能無法定位其問題,況且即使定位,也絕對無法解決。
在一籌莫展之時,突然搜尋到一篇國際友人文章,該貼對我的成功起了決定性的作用,真是山重水複疑無路,柳暗花明又一村!!!感謝該貼的作者!url例如以下:
http://www.webos-internals.org/wiki/Building_JamVM_and_GNU_Classpath_and_Jikes_(for_Java_support_in_webOS)_with_scratchbox2
詳細來說,該文提到一個非常關鍵的地方,就是在編jamvm的時候,須要enable libffi模組,否則會引起段錯誤!
我依照該文的步驟,一步一步走下來,終於得到了自己想要的結果!該文的應該用情境是arm,而且能夠帶gui,gtk等應用,而我的應用程式情境比較簡單,即在x86以下不帶gui的應用,故而我的編譯和他有一些區別,詳細過程例如以下:
1. classpath相關操作
$ cd ~/work/free
$ wget ftp://ftp.gnu.org/gnu/classpath/classpath-0.98.tar.gz
$ tar xzvf classpath-0.98.tar.gz
$ cd classpath-0.98
$ ./configure--disable-examples --without-x --disable-qt-peer --disable-gtk-peer--disable-gconf-peer --disable-plugin --disable-alsa --disable-dssi
$ make -i
$ sudo make install -i
注: classpath的預設安裝路徑為/usr/local/classpath
2. jamvm相關操作
$ cd ~/work/free
$ wget ftp://sourceware.org/pub/libffi/libffi-3.0.10.tar.gz
$ tar xzvf libffi-3.0.10.tar.gz
$ cd libffi-3.0.10
$ ./configure--prefix=/usr/local
$ make
$ sudo make install
$ sudo cp include/ffi_common.h /usr/local/include/
$cd i686-pc-linux-gnu/
$ cd include/
$ sudo cp ffi.h /usr/local/include
$ cd ../src/86
$ sudo cp ffitarget.h /usr/local/include
$ cd ~/work/free
$ wget http://freefr.dl.sourceforge.net/project/jamvm/jamvm/JamVM%201.5.4/jamvm-1.5.4.tar.gz
$ tar xzvf jamvm-1.5.4.tar.gz
$ cd jamvm-1.5.4
$ CPPFLAGS="-I/usr/local/include"
$ ./configure --with-classpath-install-dir=/usr/local/classpath -enable-ffi
$ make
$ sudo make install
3. 驗證jamvm
1> 已知源碼~/work/free/jamvm-1.5.4/java/helloworld.java:
|
public class helloworld {
public static void main(String[] args) {
System.out.println(“hello world!”);
}
} |
2> 編譯 javac helloworld.java
生產helloworld.class
3> 運行jamvm helloworld 列印結果:
helloworld!
此時我們在查看CLASSPATH, LD_LIBRARY_PATH,發現:
[email protected]:~$echo $CLASSPATH
[email protected]:~$echo $LD_LIBRARY_PATH
:/usr/local/lib
cd ~/work/free/jamvm-1.5.4/java/
[email protected]:~/work/free/jamvm-1.5.4/java$jamvm helloworld
helloworld!
能夠看到,CLASSPATH與LD_LIBRARY_PATH並不須要設定成之前說的, jamvm –version顯示的那些路徑!!!
最後,希望該文能對遇到相同問題的兄弟們起到一定協助!
Ubuntu12.04下jamvm1.5.4+classpath-0.98成功執行 helloworld.class