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8. NullPointerExceptionの典型例 HttpSession session = request.getSession(); User user = session.getAttribute("user"); if (user.isAdmin()) { // ... } ここでNullPointerException発生 引数なしでgetSessionを呼ぶのでセッションがない 場合は空のものが作られる 空のSessionの場合、userはnullになる。 9. Guard against null HttpSession session = request.getSession(false); if (session == null) { response.sendRedirect(LOGIN_URL); return; } User user = session.ge
Welcome to the Release Candidate for jQuery 3.0! This is the same code we expect to release as the final version of jQuery 3.0 (pending any major bugs or regressions). When released, jQuery 3.0 will become the only version of jQuery. The 1.12 and 2.2 branches will continue to receive critical support patches for a while, but will not get any new features or major revisions. Note that jQuery 3.0 wi
tl;dr Today, we are open-sourcing TrailDB, a core library powering AdRoll. TrailDB makes it fast and fun to handle event data. Find it at traildb.io. Problem: Event Data Imagine that you have a large amount of event data that looks like this: 2016-05-02T22:48:38 user023 view features 2016-05-02T22:49:01 user301 click graph 2016-05-02T23:03:02 user023 view pricing 2016-05-02T23:15:45 user187 submit
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