Comparing two jar files

Question

How do I compare two  jar files   Both of them have compiled  class files   I want the difference in terms of method changes  etc

User · Answer

Please try http   www osjava org jardiff  - tool is old and the dependency list is large  From the docs  it looks like worth trying

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I use to ZipDiff lib  have both Java and ant API

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Here is my script to do the process described by sje397          bin sh        Needed if running on Windows     FIND   usr bin find      DIFF  diff -r         Extract the jar  war or ear      JAR FILE1  1     JAR FILE2  2      JAR DIR   PWD             to assign to a variable     TEMP DIR   mktemp -d       echo  Extracting jars in  TEMP DIR       EXT DIR1    TEMP DIR    JAR FILE1          EXT DIR2    TEMP DIR    JAR FILE2           mkdir   EXT DIR1      cd   EXT DIR1      jar xf   JAR DIR    JAR FILE1      jad -d   -o -t2 -safe -space -b -ff -s java -r      class     cd         mkdir   EXT DIR2      cd   EXT DIR2      jar xf   JAR DIR    JAR FILE2      jad -d   -o -t2 -safe -space -b -ff -s java -r      class     cd           remove class files so the diff is clean       FIND    TEMP DIR  -name    class    xargs rm        diff recursively        DIFF    EXT DIR1    EXT DIR2    I can run it on Windows using GIT for Windows  Just open a command prompt  Run bash and then execute the script from there

User · Answer

JAPICC  sample usage   japi-compliance-checker OLD jar NEW jar  Sample reports for log4j  http   abi-laboratory pro java tracker timeline log4j    PkgDiff  sample usage   pkgdiff OLD jar NEW jar  See sample report for args4j    Clirr  sample usage   java -jar clirr-core-0 6-uber jar -o OLD jar -n NEW jar

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If you select two files in IntellijIdea and press Ctrl   Dthen it will show you the diff  I use Ultimate and don t know if it will work with Community edition

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In Linux CygWin a handy script I use at times is    Extract the jar  war or ear  cd dir1 jar xvf jar-file1 for i in  ls   class  do  javap  i  gt    i  txt  list the functions variables etc done  cd dir2 jar xvf jar-file2 for i in  ls   class  do  javap  i  gt    i  txt  list the functions variables etc done  diff -r dir1 dir2  diff recursively

User · Answer

Extract each jar to it s own directory using the jar command with parameters xvf  i e  jar xvf myjar jar for each jar   Then  use the UNIX command diff to compare the two directories  This will show the differences in the directories  You can use diff -r dir1 dir2 two recurse and show the differences in text files in each directory  xml   properties  etc    This will also show if binary class files differ  To actually compare the class files you will have to decompile them as noted by others

User · Answer

Create a folder and create another 2 folders inside it like old and new  add relevant jar files to the folders  then open the first folder using IntelliJ  after that click whatever 2 files do you want to compare and right-click and click compare archives

User · Answer

Rename  jar to  zip Extract Decompile class files with jad Recursive diff

User · Answer

use  java decompiler and decompile all the  class files and save all files as project structure    then use meld diff viewer  and compare as folders

User · Answer

Here s an aparently free tool http   www extradata com products jarc

User · Answer

Use Java Decompiler to turn the jar file into source code file  and then use WinMerge to perform comparison   You should consult the copyright holder of the source code  to see whether it is OK to do so

[java] Comparing two .jar files

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