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Java LinkedHashMap with removeEldestEntry causes java.lang.NullPointerException

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问题 The error looks like this Exception in thread "Thread-1" java.lang.NullPointerException at java.util.LinkedHashMap$Entry.remove(LinkedHashMap.java:332) at java.util.LinkedHashMap$Entry.recordAccess(LinkedHashMap.java:356) at java.util.LinkedHashMap.get(LinkedHashMap.java:304) at Server.getLastFinishedCommands(Server.java:9086) at Server.processPacket(Server.java:484) at PacketWorker.run(PacketWorker.java:34) at java.lang.Thread.run(Thread.java:744) Inside getLastFinishedCommands I use public

Nodejs http request not working

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问题 I have a piece of code that's supposed to do a http get request. The program exited successfully without error, but I didn't see any response and it didn't even go inside the callback function! At first I thought it's because http is asynchronous and put a large loop in the end but that didn't work either. Does anyone know this issue? Only the first console log sendHttpRequest and 444 gets printed. I also tried the http.get but it didn't work either. function sendHttpRequest (url, callBack) {

$(slector).load('page.html #id') vs $.get and filter/find #id

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问题 I would like to know if there is any difference in perfomance (or difference at all) Between this: $(selector).load('page #myid'); and $.get('page',function(data){ $(selector).html( $(data).find('#myid') ); /* depending the dom tree it should be .filter() */ }) 回答1: I would say using load() or .get() is more to do with your intentions and requirements rather than performance. Load() .load() is for easy/simple loading of a document or a portion of it. It will load the complete document and

How does CherryPy caching work?

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I recently discovered that page object attributes in CherryPy are persistent between requests (and between clients). So I'm wondering, would it make sense to store page output in such an attribute? Like this: class Page: def default(self, pagenumber): if pagenumber not in self.validpages: return 'Page number not found' try: html = self.pageoutput[pagenumber] except KeyError: html = self.formatter(self.dbcall(pagenumber)) return html default.exposed = True def formatter(self, data): html = # Formatting code here return html def dbcall(self, pagenumber): data = # Database lookup code here return

Angular Download Large blobs

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问题 I have an issue similar to this one where I am successfully downloading a blob generated from a backend via HTTP GET but the file is being saved to browser memory before the download begins. There's no problem when downloading small files but it doesn't immediately download 100mb+ files. Subscribing to the GET itself is causing the delay of saving the large files. I'm using Angular 6 with an object store backend. Here's the download function: finalDownload(url: string) { let headers = new

Change language on link click

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问题 I have a links such as: <a href="index.php?lang=en"><img src="images/uk.png" style="height:20px"/></a> And and included page in index.php: <?php session_start(); header('Cache-control: private'); // IE 6 FIX if(isSet($_GET['lang'])) { $lang = $_GET['lang']; // register the session and set the cookie $_SESSION['lang'] = $lang; setcookie("lang", $lang, time() + (3600 * 24 * 30)); } else if(isSet($_SESSION['lang'])) { $lang = $_SESSION['lang']; } else if(isSet($_COOKIE['lang'])) { $lang = $

ajax 'GET' call returns jsonp okay but callback produces 'undefined' data

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问题 I'm accessing a cross-domain webservice utilizing an.ajax jquery call from an html page. While I can see the jsonp data using firebug, I am not able to load it into a variable or even display it (for debugging purposes). Attempts to retrieve data using the jsonpCallback, success and complete functions always result in 'undefined' / null data. Ultimately, I need to save the data to variables. Any assistance will be greatly appreciated! $.ajax({ data: { User: UserValue, GUID: GUIDValue }, cache

WordPress get_posts by title like

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问题 I am trying to create a small search-function for WordPress. An AJAX call should get all posts where the title is like %quote% . Is there a possibility to make this happen inside the get_posts() function? Don't get me wrong. The ajax works fine. I have the ajax function in my functions.php and I receive the posts. It's just the "where title like" part where I couldn't find a solution. 回答1: No, but you can create a custom loop. Check this. EDIT: $args = array('s' => 'keyword'); $the_query =

Get class by its name in Delphi

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问题 I would like to write a function that accepts a classname and results the corresponding TClass . I've noticed that, System.Classes.GetClass function doesn't works if the classname isn't registered. Example: if(GetClass('TButton') = nil) then ShowMessage('TButton not found!') else ShowMessage('TButton found!'); The previous code always shows: TButton not found! Is there something missing? 回答1: You can get unregistered class used in Delphi application via extended RTTI. But you have to use

Send a simple GET request

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问题 I want to send a server simple GET request but as I see the .ajax sends x-requested-with header which my server doesn't understand. $.ajax({ type: 'GET', url: 'coord-' + x + '-' + y + '-' + iname, success: function(data) { $('img').each(function(idx, item) { var img_attr = $(this).attr("src") var name = img_attr.match(/\d+-\d+\.\w+/) name = name + '?r=' + Math.random() $(this).removeAttr("src") $(this).attr("src",name) }) }, }) in headers ---> X-Requested-With: XMLHttpRequest Is it possible