List contents of multiple jar files

Question

I am searching for a .class file inside a bunch of jars.

jar tf abc.jar

works for one file. I tried

find -name "*.jar" | xargs jar tf

prints nothing. The only solution I can think of, is unzip all, then search. Is there a better way? I'm on LUnix.

Edit: When scanning many jars, it is useful to print the jar file name along with the class. This method works well:

find . | grep jar$ | while read fname; do jar tf $fname | grep SchemaBuilder && echo $fname; done

Sample output produced:

  1572 Wed Jul 25 10:20:18 EDT 2007 org/apache/ws/commons/schema/SchemaBuilder$1.class
  1718 Wed Jul 25 10:20:18 EDT 2007 org/apache/ws/commons/schema/SchemaBuilder$2.class
 42607 Wed Jul 25 10:20:18 EDT 2007 org/apache/ws/commons/schema/SchemaBuilder.class
./XmlSchema-1.3.2.jar
  1572 Wed Jul 25 10:20:18 EDT 2007 org/apache/ws/commons/schema/SchemaBuilder$1.class
  1718 Wed Jul 25 10:20:18 EDT 2007 org/apache/ws/commons/schema/SchemaBuilder$2.class
 42607 Wed Jul 25 10:20:18 EDT 2007 org/apache/ws/commons/schema/SchemaBuilder.class
./XmlSchema.jar

NPE · Accepted Answer · 2011-10-14T15:59:11.017

41

You need to pass -n 1 to xargs to force it to run a separate jar command for each filename that it gets from find:

find -name "*.jar" | xargs -n 1 jar tf

Otherwise xargs's command line looks like jar tf file1.jar file2.jar..., which has a different meaning to what is intended.

A useful debugging technique is to stick echo before the command to be run by xargs:

find -name "*.jar" | xargs echo jar tf

This would print out the full jar command instead of executing it, so that you can see what's wrong with it.

edited Oct 14 '11 at 15:59

answered Oct 14 '11 at 15:52

NPE

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7

Excellent tip with the "echo" – im8bit Feb 25 '13 at 18:40
can you please modify command find -name "*.jar" | xargs -n 1 jar tf to show which file's contents are being show? – Abhijit Gaikwad Mar 25 '14 at 22:31
1

@AbhijitGaikwad I believe I have achieved which you and i wanted with this command for i in $(ls -t $(find . -name '*.jar')); do echo $i && jar tf $i; done – Angus Grant Jan 26 '22 at 18:11

Praveen Baskar · Answer 2 · 2015-09-28T10:02:48.070

3

I faced a similar situation where I need to search for a class in a list of jar files present in a directory. Also I wanted to know from which jar file the class belongs to. I used this below code snippet(shell script) and found out to be helpful. Below script will list down the jar files that contains the class to be searched.

#!/bin/sh
LOOK_FOR="codehaus/xfire/spring"
for i in `find . -name "*jar"`
do
  echo "Looking in $i ..."
  jar tvf $i | grep $LOOK_FOR > /dev/null
  if [ $? == 0 ]
  then
    echo "==> Found \"$LOOK_FOR\" in $i"
  fi
done

Shell script taken from : http://alvinalexander.com/blog/post/java/shell-script-search-search-multiple-jar-files-class-pattern

edited Sep 28 '15 at 10:02

answered Sep 28 '15 at 04:11

Praveen Baskar

31
3

Please try to add more context, not only post a link, since it may go stale in the future. – mjuarez Sep 28 '15 at 04:17
thanks for your inputs piet.t@ and mjuarez@. Updated my answer accordingly. feel free to provide your inputs. thanks! – Praveen Baskar Sep 28 '15 at 12:10
Wonder why it's so slow? – Irina Rapoport Nov 02 '16 at 03:59

Ryan · Answer 3 · 2014-04-01T20:58:47.277

1

Here's what I use in Cygwin. It supports section headers per jar file as requested above.

find . -name "*.jar" \
 -exec echo ======\ {}\ ====== \; \
 -exec /c/Program\ Files/Java/jdk1.7.0_45/bin/jar.exe tf {} \; | less

For *nix, drop the ".exe":

find . -name "*.jar" \
 -exec echo ======\ {}\ ====== \; \
 -exec jar tf {} \; | less

edited Apr 01 '14 at 20:58

answered Apr 01 '14 at 00:27

Ryan

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score 1 · Answer 4 · answered Oct 14 '11 at 15:55

1

You can also use -exec option of find

find . -name "*.jar" -exec jar tf {} \;

answered Oct 14 '11 at 15:55

Jaime Soriano

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score 0 · Answer 5 · answered Nov 18 '15 at 10:08

0

I don't see the necessity for using exec, this worked for me in Cygwin on Windows:

find . -name "*.jar" | while read jarfile; do unzip -l $jarfile | fgrep "foo" ; done

answered Nov 18 '15 at 10:08

astrograph

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score 0 · Answer 6 · answered Oct 03 '18 at 14:46

0

Find jar files and get all classes and members saved on a txt.

(for j in $(find -name '*.jar');do echo "--$j --";jar tf $j | grep .class | sed 's#/#.#g' | sed 's/.class/ /g' | xargs -n 1 javap -classpath  $j ; done;) >> classes.txt

answered Oct 03 '18 at 14:46

Diego4016

31
7

score 0 · Answer 7 · answered Nov 28 '18 at 02:04

If you coming to this question and you need to extract all jar files in a windows environment, navigate to the directory where you have saved all the jar files and save a batch file with the following content:

for /r %%f in (*) do jar -xvf %%f

By running the batch file, it will extract each jar file in the directory. The only thing here is that it will extract in the same directory where the jar file is.

score 0 · Answer 8 · answered Oct 14 '11 at 16:03

You can also use unzip which is more faster than jar (-l option to print zip content).

For instance, a small script that does roughly what you want:

#!/bin/bash

for i in $(find . -name "*.jar")
do
    if [ -f $i ]
then
    echo $i
    unzip -l $i | grep $*
fi
done

score -1 · Answer 9 · answered Oct 14 '11 at 15:51

-1

If you are using Eclipse, you can create a project and add all jars. You will then be able to find a class in any of the jars.

answered Oct 14 '11 at 15:51

Erel

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List contents of multiple jar files

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