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

Answer 1

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 

Answer 2

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.

Answer 3

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

Answer 4

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.

Answer 5

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

Answer 6

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.