Code to list all the entries in jndi on remote machine

Question

Can any one tell or point me to code to list all the jndi entries in a remote machine

Answer 1

It is possible to list all entries of an InitialContext. You can use this snippet:

InitialContext ctx = new InitialContext();
NamingEnumeration<NameClassPair> list = ctx.list("");
while (list.hasMore()) {
  System.out.println(list.next().getName());
}

If you are using an application server, there is usually the option to browse the JNDI tree.

Answer 2

The previous answers didn't give me the "full picture" (on Tomcat7), so I've thrown together the following amalgamation, which converts the JNDI values to a Tree Map (with toString values):

import javax.naming.*;
...

public static Map toMap(Context ctx) throws NamingException {
    String namespace = ctx instanceof InitialContext ? ctx.getNameInNamespace() : "";
    HashMap<String, Object> map = new HashMap<String, Object>();
    log.info("> Listing namespace: " + namespace);
    NamingEnumeration<NameClassPair> list = ctx.list(namespace);
    while (list.hasMoreElements()) {
        NameClassPair next = list.next();
        String name = next.getName();
        String jndiPath = namespace + name;
        Object lookup;
        try {
            log.info("> Looking up name: " + jndiPath);
            Object tmp = ctx.lookup(jndiPath);
            if (tmp instanceof Context) {
                lookup = toMap((Context) tmp);
            } else {
                lookup = tmp.toString();
            }
        } catch (Throwable t) {
            lookup = t.getMessage();
        }
        map.put(name, lookup);

    }
    return map;
}

Usage:

toMap(new InitialContext());

Gives the following output in Tomcat7:

{
  "comp": {
    "env": {
      "myCustomVar": "foobar"
    },
    "UserTransaction": "Cannot create resource instance",
    "Resources": {
      "index.html": "org.apache.naming.resources.FileDirContext$FileResource@32edeea8",
      "WEB-INF": {
        "ibm-web-ext.xml": "org.apache.naming.resources.FileDirContext$FileResource@6132b73b",
        "ibm-web-bnd.xml": "org.apache.naming.resources.FileDirContext$FileResource@22cf71b7"
      }
    }
  }
}

Answer 3

I know, there are lot of time from last answer, but I needed to list all jdbc datasource available in a context (tomee context).

In my case, I needed more than list("") (sadly, this didn't work for me) to reach my goal. I found a naming environment list here:

Naming Environment for J2EE Application Components

Having this, I got all available jdbc resources using next code snippet

InitialContext ctx = new InitialContext();
NamingEnumeration<NameClassPair> list = ctx.list("java:comp/env/jdbc");
while (list.hasMore()) {
    System.out.println(list.next().getName());
}

That's all.

I hope this can helps someone else, as helps me.

Answer 4

I'm using following code (not for production):

public void discoverJndi(String path, Context context) throws TestClientException, NamingException {
    try {
        NamingEnumeration<NameClassPair> list = context.list(path);
        while (list.hasMore()) {
            String name = list.next().getName();
            String child = path.equals("") ? name : path + "/" + name;
            System.out.println(child);
            discoverJndi(child, context);
        }
    } catch (NotContextException e) {}
}