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I needed to connect to a website from multiple threads simultaneously using HttpURLConnection, but use different cookies for each connection. Since Java only supports setting a global CookieManager, I've implemented the following hack. Instead of calling CookieHandler.setDefault(new CookieManager()) , I've implemented a custom CookieHandler which uses a different CookieStore instance for every thread, which is cleared after each request. I've created class called SessionCookieManager based on the source code of CookieManager . The cookieJar member variable was removed, and its usage has been replaced by getCookieStore() . The following code was added: public class SessionCookieManager extends CookieHandler { private final static SessionCookieManager ms_instance = new SessionCookieManager(); public static SessionCookieManager getInstance() { return ms_instance; } private final static ThreadLocal<CookieStore> ms_cookieJars = new ThreadLocal<CookieStore>() { @Override protected synchronized CookieStore initialValue() { return new sun.net.www.protocol.http.InMemoryCookieStore(); } }; public void clear() { getCookieStore().removeAll(); } public CookieStore getCookieStore() { return ms_cookieJars.get(); } Before the first request, the custom CookieManager is set as the global default CookieHandler : CookieHandler.setDefault(SessionCookieManager.getInstance()); After every request, the current thread's CookieStore is cleared: try { ... } finally { SessionCookieManager.getInstance().clear(); }

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