如何找到丢失的罐子？

Question

If I have a project with hundrends of jar files, and eg I have an import of a package that can not be found, how would I find which jar should I include?
Ie how do I know that package abc is defined in X.jar under /filesystem/jars where under this path there are hundrends of jars ?
Is there eg a tool to search inside jars? grep-like for jars?

Answer 1

Just google with the class name say "org.apache.struts.action.ActionMessages + jar".

You will get the jars which has the respective class.

you can also search in http://www.jarfinder.com .

Answer 2

You could also try to add the java option -verbose:class to your startup options, this will produce dumps like:

[Loaded java.security.BasicPermissionCollection from shared objects file]
[Loaded sun.misc.JavaSecurityProtectionDomainAccess from C:\Program Files (x86)\Java\jdk1.6.0_32\jre\lib\rt.jar]
[Loaded java.security.ProtectionDomain$2 from C:\Program Files (x86)\Java\jdk1.6.0_32\jre\lib\rt.jar]
[Loaded java.security.ProtectionDomain$Key from C:\Program Files (x86)\Java\jdk1.6.0_32\jre\lib\rt.jar]
[Loaded java.security.Principal from shared objects file]

See also what-is-shared-objects-fil

I use eclipse with maven. In this environment I can simply open the class and choose View in Package Explorer from the context menu. After that the Package Explorer shows the expanded strcuture of the jar in the Maven Dependcies.