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String principal = "cn=" + getParameter("username") + ", ou=Users, o=example";
String password = getParameter("password");
env.put(Context.SECURITY_AUTHENTICATION, "simple");
env.put(Context.SECURITY_PRINCIPAL, principal);
env.put(Context.SECURITY_CREDENTIALS, password);
// Create the initial context
DirContext ctx = new InitialDirContext(env);Instead, implement code for LDAP as follows:// if the username contains LDAP specials, stop now
if ( containsLDAPspecials(getParameter("username")) ) {
        throw new javax.naming.AuthenticationException();
}
String principal = "cn=" + getParameter("username") + ", ou=Users, o=example";
String password = getParameter("password");
env.put(Context.SECURITY_AUTHENTICATION, "simple");
env.put(Context.SECURITY_PRINCIPAL, principal);
env.put(Context.SECURITY_CREDENTIALS, password);
// Create the initial context
DirContext ctx = new InitialDirContext(env);