Converting .class file

Hi all,
i have a doubt regarding, How to convert a .class file into a .java file without using any tools.

If you look at the java spec there is a chapter on class file structure.
One warning however. D'ya ever see 'Batman Returns'? You know the part where the penguin reassembles all those documents with sticky tape - that's the kind of area you are in here.
Tools will make you life so much simpler. Try jad, lovely. Or even javap -c, you don't get javacode, but the bytecode is reasonably easy to understand.

Similar Messages

  • Error while converting class file to exp and jca file

    error while converting *.class file to *.exp and *.jca file
    =====================================================================================================================
    linux-y60u:/home/admin/java_card_kit-2_2_1/samples/src # converter -exportpath "/home/admin/java_card_kit-2_2_1/lib/" com/sun/javacard/samples/HelloWorld 0x00:0x01:0x02:0x03:0x04:0x05:0x06:0x07:0x0b 1.0 -v -applet 0x00:0x01:0x02:0x03:0x04:0x05:0x06:0x07:0x0b:0x01 Identity
    Java Card 2.2.1 Class File Converter, Version 1.3
    Copyright 2003 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.
    parsing /home/admin/java_card_kit-2_2_1/samples/src/com/sun/javacard/samples/HelloWorld/HelloWorld.class
    parsing /home/admin/java_card_kit-2_2_1/samples/src/com/sun/javacard/samples/HelloWorld/Identity.class
    error: com.sun.javacard.samples.HelloWorld.HelloWorld: unsupported class file format of version 50.0.
    error: com.sun.javacard.samples.HelloWorld.Identity: unsupported class file format of version 50.0.
    conversion completed with 2 errors and 0 warnings.
    =====================================================================================================================

    i compile a file javacard use this command:
    ===
    javac -source 1.3 -target 1.1 -g -classpath ./classes:../lib/api.jar:../lib/installer.jar src/com/sun/javacard/samples/Identity/Identity.java
    ===
    and try to convert this class use this command
    ===
    /home/xnuxerx/admin/java_card_kit-2_2_1/bin/converter -exportpath "/home/xnuxerx/admin/java_card_kit-2_2_1/lib/" com/sun/javacard/samples/Identity 0x00:0x01:0x02:0x03:0x04:0x05:0x06:0x07:0x0b 1.0 -v -applet 0x00:0x01:0x02:0x03:0x04:0x05:0x06:0x07:0x0b:0x01 Identity
    ===
    result convert:
    ===
    Java Card 2.2.1 Class File Converter, Version 1.3
    Copyright 2003 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.
    parsing /home/xnuxerx/admin/java_card_kit-2_2_1/samples/classes/com/sun/javacard/samples/Identity/Identity.class
    converting com.sun.javacard.samples.Identity.Identity
    error: export file framework.exp of package javacard.framework not found.
    conversion completed with 1 errors and 0 warnings.
    ===
    why ??
    please your comment for this problem.
    thank 4 all.

  • How to convert .class file to exec file...

    hi.
    how to convert .class file to exec file...
    please explain me clearly.....
    thanks...

    Placing your exact "question" into google:
    http://www.google.com/search?q=how+to+convert+.class+file+to+exec+file...

  • How to convert .class files to .java files

    Hi,
    I want to convert .class files to .java files. Is there is any software for that doing except Dj DCompiler? Because if i am using this i am not getting proper code i mean as it is available in the file.
    I tried by writing simple java file and i compiled Sample.java file and i got a .class file then i converted this Sample.class to Sample.java file by using DjDcompiler but i was missing some statements i need entire code that is available in Sample.java file. Please tell me any other software for that doing.
    Thank you in advance

    I want to convert .class files to .java files.
    iles. Is there is any software for that doing except
    Dj DCompiler? Because if i am using this i am nothttp://www.google.com/search?hl=en&q=java+decompiler&meta=
    getting proper code i mean as it is available in the
    file.I doubt you ever will.
    I tried by writing simple java file and i compiled
    Sample.java file and i got a .class file then i
    converted this Sample.class to Sample.java file by
    using DjDcompiler but i was missing some statements i
    need entire code that is available in Sample.java
    file. Please tell me any other software for that
    doing.Did you hear about "compiler opimizations"?

  • Converting .class file to .dll file

    Hi
    Can any body tell me what is the procedure for converting .class file to .dll(windows) file.
    Thanks,
    latif

    One way, You could produce a DLL that wraps the JVM and loads your java class exposing a C and/or C++ callable interface, but that is a lot to go through.
    Otherwise, if you are thinking of using Java class for .net applications you can
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  • How to convert class file

    Hi all, I am new in java card development.
    This is my environment setting:
    @echo off
    set JC_HOME=C:\JavaCard\java_card_kit-2_2
    set JAVA_HOME=C:\j2sdk14103
    set PATH=.;%JC_HOME%\bin;%PATH%
    I have created the Wallet applet according to 'Zhiqun Chen" text book and named it WalletApp.java.
    I have compiled this file to a class file.
    This is where is I saved my file
    C:\JavaCard\java_card_kit-2_2\samples\src\com\sun\javacard\samples\WalletApp\WalletApp.java.
    But I don't really understand how to convert the class file.
    May I know what is this for?
    -out EXP JCA CAP
    -exportpath
    -applet 0xa0:0x0:0x0:0x0:0x62:0x3:0x1:0xc:0x1:0x1
    com.sun.javacard.samples.HelloWorld.HelloWorld
    com.sun.javacard.samples.HelloWorld
    0xa0:0x0:0x0:0x0:0x62:0x3:0x1:0xc:0x1 1.0
    must save this in what file?
    I tried to type in the command line below (and the result):
    C:\JavaCard\java_card_kit-2_2\samples>converter -config scr\com\sun\javacard\sap
    les\Wallet\Wallet.opt
    error: file scr\com\sun\javacard\saples\Wallet\Wallet.opt could not be found
    Usage: converter <options> package_name package_aid major_version.minor_ver
    sion
    OR
    converter -config <filename>
    use file for all options and parameters to converter
    Where options include:
    -classdir <the root directory of the class hierarchy>
    set the root directory where the Converter
    will look for classes
    -i support the 32-bit integer type
    -exportpath <list of directories>
    list the root directories where the Converter
    will look for export files
    -exportmap use the token mapping from the pre-defined export
    file of the package being converted. The converter
    will look for the export file in the exportpath
    -applet <AID class_name>
    set the applet AID and the class that defines the
    install method for the applet
    -d <the root directory for output>
    -out [CAP] [EXP] [JCA]
    tell the Converter to output the CAP file,
    and/or the JCA file, and/or the export file
    -V, -version print the Converter version string
    -v, -verbose enable verbose output
    -help print out this message
    -nowarn instruct the Converter to not report warning messages
    -mask indicate this package is for mask, so restrictions on
    native methods are relaxed
    -debug enable generation of debugging information
    -nobanner suppress all standard output messages
    -noverify turn off verification. Verification is default
    *********************************************************May I know What is the correct command line to convert the class file and what must I do to before converting the class file?
    I saw some article saying we must use JDK1.3, is it a must?
    Your solution is highly appreciated.
    Thank you!

    Hi Ricardo,
    I saved the file below as WalletApp.opt in the directory of scr\com\sun\javacard\samples\WalletApp
    -out EXP JCA CAP
    -exportpath c:\javacard\java_card_kit-2_2\api_export_files
    -applet 0xa0:0x0:0x0:0x0:0x62:0x3:0x1:0xc:0x2:0x1 WalletApp.WalletApp
    WalletApp 0xa0:0x0:0x0:0x0:0x62:0x3:0x1:0xc:0x2 1.0
    But I still have the problem below:
    C:\JavaCard\java_card_kit-2_2\samples>converter -config scr\com\sun\javacard\sam
    ples\WalletApp\WalletApp.opt
    error: file scr\com\sun\javacard\samples\WalletApp\WalletApp.opt could not be fo
    und
    Usage: converter <options> package_name package_aid major_version.minor_ver
    sion
    OR
    converter -config <filename>
    May I know What's wrong with my command or file?
    Where can I download JDK because what I can find is J2SDK.
    Thank you!

  • How to convert .class file to .dll file

    hi,
    I got a problem, I have to convert my java .class file to .dll file. Microsoft VC++ program will invoke the converted .dll file.
    Is there any other possibility.
    I was confused.
    Cam any body help me. If you are having solution for the can you send to my [email protected] account.
    thanks,

    No, it is not possible to do what you are suggesting. Yes, you could produce a DLL that wraps the JVM and loads your java class exposing a C and/or C++ callable interface, but that is a lot to go through unless your class is VERY complex. Otherwise, you might want to just create and maintain two implementations.

  • How to convert class file into exe

    I have made a simple calculator using swing.now i want it to be used as an application from the desktop..How can i do it?..any suggestions?

    raghu0007 wrote:
    I have converted the class file to jar using jar cvf simplecalci.jar simplecalci.class.
    Now i don't know wat to do next since when i double click the jar.....windows shows the message
    Failed to load Main-class manifest attribute from c:\users\raghu\simplecalculator\build\classes\simplecalculator\simplecalci.jar
    I am using netbeans and i have JRE 5 as well as JRE 6 installed.
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    Simply right click on the project node in nb and select
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    Eg:
    C:\Documents and Settings\raghu0007\My Documents\NetBeans Projects\SimpleCalculcator\dist\There will usually be 2 files in there, 1 for the Gui parts and the other(.jar) the rest.
    These two files must always be together (same directory for the jar file to work)
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    If you know the above just take a look at how you modified the MANAFEST file and the file(MF,class...) locations in the .jar
    For Windows XP
    Edited by: gtRpr on 2008/06/20 09:48

  • Convert .class files into .java files???

    Does anybody know how to convert x.class file back to a x.java file. Or in other terms, extract .java files from a jarfile??
    Thanks for any help
    /carlos

    Does anybody know how to convert x.class file back to a x.java file.As Dr.Clap said, that's decompiling.
    Or in other terms, extract .java files from a jarfile??That isn't quite the same thing. You can decompile a .class that's in a jar, but a .class file doesn't have to be in a jar and a file in a jar isn't necessarily a .class.

  • How to convert class files into java files??

    Hey Guys,
    I need a little help.
    I want to know wheather we can view .class files as .java files or convert the .class to .java files.Is ther any tool or software for doing that.
    Or in other words can i see the source code of any .class file..??
    Plz do tell me if we can do that or any other way we can do that.
    Regds,
    Gokul

    Sort of. A "decompiler" will take a class file and generate a source code file of source code that could be compiled to get the class file you started out with. However, it won't be the same source code that was originally used to create the class. Most notably, comments will be missing, and variable names will probably be meaningless.
    And before you say "java is bad because you can decompile it", note that any language that you can execute you can theoretically decompile.
    Also, you can view the raw byte codes. If you're familiar with assembly language, or better yet familar with java bytecodes and the JVM in particular, you can often find out what a particular method does just by viewing the byte codes.

  • How to convert class file to Java source code ?

    Hi All ,
    Currently am working in Peoplesoft Demo project using java as Plug in.We have only the class files and jar files and we have planned to modify the code for future enhancements.We dont have any legal issues here as we are already working with our client for the original source code.
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    Thanks for your reply ....We have asked them so many times ..but they say they dont have it .Since we have planned to do some enhancements from our end we have planned to do reverse engineering process.

  • Converting class files into java source codes

    Dear Friends,
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    http://www.retrologic.com/
    http://www.2lkit.com/products/2LKitObf/
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  • How to convert class file to pdb

    Hi all,
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    Download MIDP for Palm Os. Will convert you jar files to pdb.

  • How to convert JSP Compiled class file back to JSP

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    nope...its not et al possible...!!!
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  • How to convert java class file version without decompiling

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