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Java, how to search if a class exists with a Jar

Posted on 2014-01-14
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Last Modified: 2014-01-15
What is the comand to determine if a class exists within a jar

I tried the following

java -jar TEST.jar -i . button
Ignoring unknown flag: -i
Ignoring unknown flag: .
Ignoring unknown flag: button

java.lang.NullPointerException

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But obviously it did not work

Could someone please post an example of how to do this for

1> Th ecurrent directory

2> any subdirectory

Thanks
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Question by:Los Angeles1
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6 Comments
 
LVL 86

Expert Comment

by:CEHJ
ID: 39780269
http://technojeeves.com/joomla/index.php/free/45-jarsearch
 i've already given you. If you want to use the command line (assuming Windows)

jar tf x.jar | find "something"

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Of course, that will only work for one jar at a time
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Author Comment

by:Los Angeles1
ID: 39780344
I dont have an excutable named jar

Do you mean java

I can not get tf or -tf to work

Can you help on this
0
 
LVL 28

Assisted Solution

by:dpearson
dpearson earned 664 total points
ID: 39780935
The "jar" tool is part of the JDK (Java development toolkit).  You may just have the Java runtime.  Download the full JDK and you will get these extra tools like jar:

http://docs.oracle.com/javase/tutorial/deployment/jar/basicsindex.html

You can get the JDK from here:
http://www.oracle.com/technetwork/java/javase/downloads/jdk7-downloads-1880260.html

Or you can use the rjar tool
https://code.google.com/p/rjar/
to do a recursive search of all jars within a parent jar (and you wouldn't need the JDK - you'd just download rjar instead).

Doug
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LVL 6

Assisted Solution

by:Mahesh Bhutkar
Mahesh Bhutkar earned 668 total points
ID: 39781448
Simply go to your JDK bin path where you will find jar utility. Fire below command,

e.g. :-
C:\Program Files\Java\jdk\bin> jar tf <jarFileWithLocation> | find "button.class"

So in your case,
jar tf <path to TEST.jar> | find "button.class"
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LVL 86

Accepted Solution

by:
CEHJ earned 668 total points
ID: 39782089
Simply go to your JDK bin path

If you're doing anything with Java other than running apps, you should

a. You need a JDK
b. Its bin directory should be in PATH
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LVL 86

Expert Comment

by:CEHJ
ID: 39782755
:)
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