How to get classpath from classloader?

Question

I am using some third party code which when given a \'-classpath\' command line argument doesnt set the java.class.path, but instead just creates a classloader, adds all the

Answer 1

Drop this code into an empty jsp page to view classLoader hierarchy and associated jars loaded at each level.

visit() method below could also be used on its own

<%!
    public void visit(StringBuilder sb, int indent, ClassLoader classLoader) {
        if (indent > 20 || classLoader == null)
            return;
        String indentStr = new String(new char[indent]).replace("\0", "    ");
        sb.append("\n");
        sb.append(indentStr);
        sb.append(classLoader.getClass().getName());
        sb.append(":");
        if (classLoader instanceof java.net.URLClassLoader) {
            java.net.URL[] urls = ((java.net.URLClassLoader)classLoader).getURLs();
            for (java.net.URL url : urls) {
                sb.append("\n");
                sb.append(indentStr);
                sb.append(url);
            }
        }
        sb.append("\n");
        visit(sb, indent + 1, classLoader.getParent());
    }

%>

<%
StringBuilder sb = new StringBuilder();
visit(sb,1,this.getClass().getClassLoader());
%>
<%=sb%>