bash command to know .jar of searched class

[manuel aldana]

hi,

sometimes i come across the problem that a NoClassDefFoundError occurs and I don't know the jar for it. Searching manually is cumbersome, so I want to find out by bash command.

Following gives me a list whether it could be found out by a list of jars, but it does not give me the information which jar it is:

find . -name "*jar" -exec jar -tf '{}' \; | grep ClassToSearchFor

is it possible to place a echo output of jar-filename in the above find command also?

thanks!

[Andrew Monkhouse]

Possibly the easiest way is to search for just the unqualified class name in the jar file itself (so don't try to give it any package names, and don't try to list the contents of the jar file). Assuming you don't have too many files to search through, you grep for the class name in the list of jar files:

$ grep BASE64EncoderStream `find . -name '*.jar'`
Binary file ./lib/mailapi.jar matches

If there are too many files to list on the command line in that way, you could try a much slower method such as looking at each file individually:

$ find . -name '*.jar' | while read LINE; do grep BASE64EncoderStream "$LINE";done
Binary file ./lib/mailapi.jar matches

Of course we can then start making the commands even more complex to show exactly which class we found (in the cases where there may be multiple matches), and expand our search to include wars, ears, sars,...:

find . -name '*.[jwes]ar' | while read LINE; do grep -q Mail "$LINE"; if [ $? -eq 0 ];then echo "$LINE"; jar tvf "$LINE" | grep Mail;echo;fi;done
./lib/activation.jar
  9610 Wed Oct 17 11:05:40 MDT 2007 javax/activation/MailcapCommandMap.class
  7145 Wed Oct 17 11:05:40 MDT 2007 com/sun/activation/registries/MailcapFile.class
   335 Wed Oct 17 11:05:40 MDT 2007 com/sun/activation/registries/MailcapParseException.class
  3376 Wed Oct 17 11:05:42 MDT 2007 com/sun/activation/registries/MailcapTokenizer.class
 
./lib/imap.jar
  1749 Wed Oct 17 11:05:58 MDT 2007 com/sun/mail/imap/protocol/MailboxInfo.class
  1998 Wed Oct 17 11:05:58 MDT 2007 com/sun/mail/imap/protocol/BASE64MailboxDecoder.class
  2223 Wed Oct 17 11:05:58 MDT 2007 com/sun/mail/imap/protocol/BASE64MailboxEncoder.class
 
./lib/mailapi.jar
   320 Wed Oct 17 11:05:30 MDT 2007 javax/mail/event/MailEvent.class
  3677 Wed Oct 17 11:05:34 MDT 2007 javax/mail/internet/MailDateFormat.class
  4114 Wed Oct 17 11:05:34 MDT 2007 javax/mail/internet/MailDateParser.class

Regards, Andrew

[Charles Lyons]

How about:

find . -name "*jar" -print -exec jar -tf '{}' \; | grep -E "jar$|CLASS_NAME"

where you replace CLASS_NAME with the class name? For example:

find . -name "*jar" -print -exec jar -tf '{}' \; | grep -E "jar$|VTITemplate"

would give you a list like this:

./derby-10.2.2.0.jar
org/apache/derby/vti/UpdatableVTITemplate.class
org/apache/derby/vti/VTITemplate.class
./commons-collections-3.2.jar
./geronimo-jta_1.1_spec-1.1.jar
./geronimo-jpa_3.0_spec-1.0.jar
./commons-lang-2.1.jar
./commons-pool-1.3.jar
./serp-1.13.1.jar

so you know the VTITemplate class resides in the derby-10.2.2.0.jar file. That's quite efficient, and for small numbers of JARs quite readable too.

You could be more sophisticated with grep or sed to parse that output further if you needed to be (e.g. to only output lines ending .jar which come before a line ending .class).

[Charles Lyons]

Or this:

find . -name "*jar" -print -exec jar -tf '{}' \; | grep -E "jar$|CLASS_NAME" | sed -nre "/jar$/ { x; d; }; /class$/ { x; p; } "

which is better. I haven't tested it thoroughly, but you'll get output which is the JAR name followed by all matching names in that JAR. There are undoubtedly shorter and more efficient ways to do this---the above just came out of my head (and therefore, could be dodgy, so use carefully!).

[Stefan Wagner]

Since jars are zipped, and zgrep is a combination of zip and grep, you may use zgrep:

find . -exec zgrep XYZ.class '{}' \; -print

[Peter Johnson]

I use jarFinder, and find it indispensable.