Compiling jdk 1.1.7 code to run in 1.4.2

I am new to Java & have inherited an old IBM Websphere 3.02 system which runs JDK 1.1.7. We need to move this to Websphere v5 or v6 which also involves a move to JDK 1.4.2.
From reading various forums it appears that java is not necessarily upwardly compatible. Given this I am looking for opinions on the following.
What is the likelihood of being able to compile the 1.1.7 code without any changes to run in 1.4.2?
Any help is much appreciated.

If I'm not mistaken, backward compatible would mean you could take 1.5 code,
compile it with a 1.1 compiler and run it on a 1.1 JVM, this definition Java is not
backward compatibleyes..i learned this when i compiled my program with 1.5. it turned out that how the byte code is stored has changed. i would get error message indicating this.
compile using 1.4 and run it with a JRE 1.5 will be ok.

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Compiling JDK 1.4.2 from source, under win32

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Here is how I compiled JDK 1.4.2 from source-code under win32. I hope this helps the many others who are interested in doing the same.
1) Download the sources from here: http://wwws.sun.com/software/communitysource/j2se/java2/download.html
Be sure to download all packages (SCSL source, SCSL binaries, mozilla binaries)
2) Download gnu make from here: http://ftp.gnu.org/pub/gnu/make/
3) Download Info-zip "zip" and "unzip" packages: http://www.info-zip.org/pub/infozip/UnZip.html and http://www.info-zip.org/pub/infozip/Zip.html
4) Request and evaluation copy of MKS Toolkit: http://www.mkssoftware.com/eval/
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5) Download the DirectX 9.0 SDK from here: http://www.microsoft.com/downloads/details.aspx?FamilyID=124552ff-8363-47fd-8f3b-36c226e04c85&displaylang=en
Sun actually requires DirectX 7.0 SDK but I couldn't find a copy anywhere so we have no choice but use a newer copy. This is another issue Sun should really address.
6) Install DirectX SDK, MKS Toolkit, Info-zip zip and unzip
7) Unpack gnu make into a directory and build it using the special steps for the MKS Toolkit shell. If you're trying to build make 3.80 be sure to fix this bug before you proceed or else it won't build: https://savannah.gnu.org/bugs/index.php?func=detailitem&item_id=1687
8) Set your build environment variables. Here are my personal settings:
call "C:\Program Files\Microsoft Visual Studio\VC98\Bin\vcvars32.bat"
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set ALT_MSVCRT_DLL_PATH=c:\windows\system32
set ALT_BOOTDIR=c:\j2sdk1.4.2_04
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set include=%include%;c:\program files\microsoft sdk\include
set JAVA_HOME=
9) You must build against Visual C++ 6.0 (Visual C++ .NET won't work because its missing non-standard header files used by Sun, such as iostream.h)
10) "cd <jdk source dir>\control\make"
11) Edit <jdk source dir>\j2me\make\common\Sanity.gmk line 1135. Replace:
ifeq ($(PLATFORM), windows)
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12) Start the build process: "make scsl"
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14) If you see a "'c:\program' not found" error while compiling. Be sure that the paths set by VCVARS32.BAT use short-names not long-names, because make gets confused by paths with spaces.
15) If you see an error "No rule to make target `/usr/src/j2sdk-1_4_2-src-scsl/control/build/linux-i586/lib/fonts/LucidaTypewriterRegular.ttf'" it means you forgot to extract the "SCSL binaries" package into the source-code directory
I will post solutions to further compiler errors as I encounter them, I encourage you to do the same.

hey
i m trying to install JDK 1.5 from source under win XP
dev-sanity pass so i suppose i have all installed correctly
the problem is when i run the command "make scsl" to compile all
i got an error which is into "link.exe" at the begin of the compilation :
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link.exe kernel32.lib user32.lib gdi32.lib winspool.lib comdlg32.lib ad
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Try `link --help' for more information.
NMAKE : fatal error U1077: 'link.exe' : return code '0x1'
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NMAKE : fatal error U1077: 'cd' : return code '0x2'
Stop.
NMAKE : fatal error U1077: '"c:\Program Files\Microsoft Visual Studio\VC98\bin\n
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Stop.
make[3]: *** [generic_build2] Error 2
make[3]: Leaving directory `/Sources/hotspot/make'
make[2]: *** [product] Error 2
make[2]: Leaving directory `/Sources/hotspot/make'
make[1]: *** [hotspot-build] Error 2
make[1]: Leaving directory `/Sources/control/make'
make: *** [scsl-build] Error 2
i installed visual studio professional 6 sp3 as required ine the "build-windows-i586.html" file ! is the file link.exe incorrect in the pack 3??
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Compile to what - a class file?
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import javax.servlet.http.*;
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hello|
WEB-INF|
web.xml
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>
Thanks -- Howard

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<font size="3"><font color="red">•<font face="courier new">
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Using XML-based object structures to represent data in code/at run-time

Hello,
I have quite a "high level" question which has be bothering me for some time, and I haven't found the subject tackled in any books. I believe J2SE/J2EE is not an important divide here.
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Hi Christian,
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ERROR [code=1] Running adjopy.class

Hi DBA's
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Copyright (c) 2002 Oracle Corporation
Redwood Shores, California, USA
AD Java
Version 11.5.0
NOTE: You may not use this utility for custom development
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Best Regards,
SG

SG,
Please review the following note:
Note: 376096.1 - I/O or ZIP Error While Attempting To Read Entry meta-inf/jdev-ext.xml
https://metalink2.oracle.com/metalink/plsql/ml2_documents.showDocument?p_database_id=NOT&p_id=376096.1
Regards,
Hussein

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Regards
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http://bugs.adobe.com/jira/browse/FP-4137
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Compiling jdk 1.1.7 code to run in 1.4.2

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