how to find the jar file containing a class definition? [closed]

Answer 1

I have written a program for this: https://github.com/javalite/jar-explorer It will also decompile existing byte code to show you interfaces, methods, super classes, will show contents of other resources - text, images, html, etc.

Answer 2

In the same lines as BalusC's answer (I can't post comment yet nor link 2 urls, no reputation :( ), you can find a jar thanks to these 2 jar finder engines: - http://www.jarfinder.com/ - findjar

Answer 3

Very often I inherit code that complains about a class that doesn't exist, and it is just because the jar file is not included in the classpath.

If it's not in the classpath, then you likely don't have the JAR file itself at all. Searching via Eclipse's builtin Ctrl+Shift+T function won't help much. Usually you can make use of the package name to "guess" where you could get the JAR file from at the internet. E.g. a org.apache.commons.lang.XXX class is available at http://commons.apache.org/lang.

For the unobvious ones, I myself use http://grepcode.com, the JAR source code search engine.

Answer 4

use this:

public class Main {

    private static final String SEARCH_PATH = "C:\\workspace\\RPLaunch";
    private static String CLASS_FILE_TO_FIND =
            "javax.ejb.SessionBean";
    private static List<String> foundIn = new LinkedList<String>();

    /**
     * @param args the first argument is the path of the file to search in. The second may be the
     *        class file to find.
     */
    public static void main(String[] args) {
        File start;
        new Scanner(args[0]);
        if (args.length > 0) {
            start = new File(args[0]);
            if (args.length > 1) {
                CLASS_FILE_TO_FIND = args[1];
            }
        } else {
            start = new File(SEARCH_PATH);
        }
        if (!CLASS_FILE_TO_FIND.endsWith(".class")) {
            CLASS_FILE_TO_FIND = CLASS_FILE_TO_FIND.replace('.', '/') + ".class";
        }
        search(start);
        System.out.println("------RESULTS------");
        for (String s : foundIn) {
            System.out.println(s);
        }
    }

    private static void search(File start) {
        try {
            final FileFilter filter = new FileFilter() {
                public boolean accept(File pathname) {
                    return pathname.getName().endsWith(".jar") || pathname.isDirectory();
                }
            };
            for (File f : start.listFiles(filter)) {
                if (f.isDirectory()) {
                    search(f);
                } else {
                    searchJar(f);
                }
            }
        } catch (Exception e) {
            System.err.println("Error at: " + start.getPath() + " " + e.getMessage());
        }
    }

    private static void searchJar(File f) {
        try {
            System.out.println("Searching: " + f.getPath());
            JarFile jar = new JarFile(f);
            ZipEntry e = jar.getEntry(CLASS_FILE_TO_FIND);
            if (e == null) {
                e = jar.getJarEntry(CLASS_FILE_TO_FIND);
            }
            if (e != null) {
                foundIn.add(f.getPath());
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}

Answer 5

@Nikita Rybak: AstroGrep for Windows is our friend: http://astrogrep.sourceforge.net/

Answer 6

for x in $(find . -name '*.jar') do unzip -l $x | grep WCCResponseImpl done