LdapContextSource contextSource = new LdapContextSource();
PoolingContextSource source = new PoolingContextSource();

contextSource.setUrl("The desired url");
contextSource.setBase("");
contextSource.setUserDn("DN value");            contextSource.setPassword("Password");
Map<String,Object> env = new HashMap<String,Object>();
env.put("com.sun.jndi.ldap.connect.timeout", "15000");
contextSource.setBaseEnvironmentProperties(env);                        contextSource.afterPropertiesSet();

source.setContextSource(contextSource);
source.setMaxWait("Long value for 15000");