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• C++ Program Always Crashes While doing a std::string assign

  - by bbazso

  I have been trying to debug a crash in my application that crashes (i.e. asserts a * glibc detected free(): invalid pointer: 0x000000000070f0c0 **) while I'm trying to do a simple assign to a string. Note that I'm compiling on a linux system with gcc 4.2.4 with an optimization level set to -O2. With -O0 the application no longer crashes. E.g. std::string abc; abc = "testString"; but if I changed the code as follows it no longer crashes std::string abc("testString"); So again I scratched my head! But the interesting pattern was that the crash moved later on in the application, AGAIN at another string. I found it weird that the application was continuously crashing on a string assign. A typical crash backtrace would look as follows: #0 0x00007f2c2663bfb5 in raise () from /lib64/libc.so.6 (gdb) bt #0 0x00007f2c2663bfb5 in raise () from /lib64/libc.so.6 #1 0x00007f2c2663dbc3 in abort () from /lib64/libc.so.6 #2 0x00000000004d8cb7 in people_streamingserver_sighandler (signum=6) at src/peoplestreamingserver.cpp:487 #3 <signal handler called> #4 0x00007f2c2663bfb5 in raise () from /lib64/libc.so.6 #5 0x00007f2c2663dbc3 in abort () from /lib64/libc.so.6 #6 0x00007f2c26680ce0 in ?? () from /lib64/libc.so.6 #7 0x00007f2c270ca7a0 in std::string::assign (this=0x7f2c21bc8d20, __str=<value optimized out>) at /home/bbazso/ThirdParty/sources/gcc-4.2.4/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/basic_string.h:238 #8 0x00007f2c21bd874a in PEOPLESProtocol::GetStreamName (this=<value optimized out>, pRawPath=0x2342fd8 "rtmp://127.0.0.1/mp4:pop.mp4", lStreamName=@0x7f2c21bc8d20) at /opt/trx-HEAD/gcc/4.2.4/lib/gcc/x86_64-pc-linux-gnu/4.2.4/../../../../include/c++/4.2.4/bits/basic_string.h:491 #9 0x00007f2c21bd9daa in PEOPLESProtocol::SignalProtocolCreated (pProtocol=0x233a4e0, customParameters=@0x7f2c21bc8de0) at peoplestreamer/src/peoplesprotocol.cpp:240 This was really weird behavior and so I started to poke around further in my application to see if there was some sort of memory corruption (either heap or stack) error that could be occurring that could be causing this weird behavior. I even checked for ptr corruptions and came up empty handed. In addition to visual inspection of the code I also tried the following tools: Valgrind using both memcheck and exp-ptrcheck electric fence libsafe I compiled with -fstack-protector-all in gcc I tried MALLOC_CHECK_ set to 2 I ran my code through lint checks as well as cppcheck (to check for mistakes) And I stepped through the code using gdb So I tried a lot of stuff and still came up empty handed. So I was wondering if it could be something like a linker issue or a library issue of some sort that could be causing this problem. Are there any know issues with the std::string that make is susceptible to crashing in -O2 or maybe it has nothing to do with the optimization level? But the only pattern that I can see thus far in my problem is that it always seems to crash on a string and so I was wondering if anyone knew of any issues that my be causing this type of behavior. Thanks a lot!

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• Strange ruby behavior when using Hash.new([])

  - by Valentin Vasilyev

  Consider this code: h=Hash.new(0) #new hash pairs will by default have 0 as values h[1]+=1 # {1=>1} h[2]+=2 # {2=>2} that's all fine, but: h=Hash.new([]) #empty array as default value h[1]<<=1 #{1=>[1]} - OK h[2]<<=2 #{1=>[1,2], 2=>[1,2]} # why ?? At this point I expect the hash to be: {1=>[1], 2=>[2]} But something goes wrong. Does anybody know what happens?

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• WordPress: Display Online Users' Avatars

  - by Wade D Ouellet

  Hi, I'm using version 2.7.0 of this WordPress plugin to display which users are currently online (the latest version doesn't work): http://wordpress.org/extend/plugins/wp-useronline/ It's working great but I would love to be able to alter it quickly to display the users' avatars instead of their names. Hoping someone with pretty good knowledge of WordPress queries and functions can help. The part below seems to be the part that handles all this. If this isn't enough, here is the link to download the version I am using with the full php files: http://downloads.wordpress.org/plugin/wp-useronline.2.70.zip // If No Bot Is Found, Then We Check Members And Guests if ( !$bot_found ) { if ( $current_user->ID ) { // Check For Member $user_id = $current_user->ID; $user_name = $current_user->display_name; $user_type = 'member'; $where = $wpdb->prepare("WHERE user_id = %d", $user_id); } elseif ( !empty($_COOKIE['comment_author_'.COOKIEHASH]) ) { // Check For Comment Author (Guest) $user_id = 0; $user_name = trim(strip_tags($_COOKIE['comment_author_'.COOKIEHASH])); $user_type = 'guest'; } else { // Check For Guest $user_id = 0; $user_name = __('Guest', 'wp-useronline'); $user_type = 'guest'; } } // Check For Page Title if ( is_admin() && function_exists('get_admin_page_title') ) { $page_title = ' &raquo; ' . __('Admin', 'wp-useronline') . ' &raquo; ' . get_admin_page_title(); } else { $page_title = wp_title('&raquo;', false); if ( empty($page_title) ) $page_title = ' &raquo; ' . strip_tags($_SERVER['REQUEST_URI']); elseif ( is_singular() ) $page_title = ' &raquo; ' . __('Archive', 'wp-useronline') . ' ' . $page_title; } $page_title = get_bloginfo('name') . $page_title; // Delete Users $delete_users = $wpdb->query($wpdb->prepare(" DELETE FROM $wpdb->useronline $where OR timestamp < CURRENT_TIMESTAMP - %d ", self::$options->timeout)); // Insert Users $data = compact('user_type', 'user_id', 'user_name', 'user_ip', 'user_agent', 'page_title', 'page_url', 'referral'); $data = stripslashes_deep($data); $insert_user = $wpdb->insert($wpdb->useronline, $data); // Count Users Online self::$useronline = intval($wpdb->get_var("SELECT COUNT(*) FROM $wpdb->useronline"));

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• Is it possible to avoid downloading song up to the supplied position using SoundManager2?

  - by dinjas

  I'm using the SoundManager2 JavaScript SDK on a site that streams synchronized audio from SoundCloud to multiple clients simultaneously. When a new user loads the page, the audio is loaded, and a position parameter is set to specify where playback should begin. The problem arises when the track is really long (say 60 minutes), and the current track position is substantially far into the track (e.g. 30 minutes). When this is the case, it takes a really long time before playback begins because the track has to download/buffer up to the current position. Is there a way to avoid downloading the 30 minutes of audio that I don't need?

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• Scroll up/down while selecting multi-page block of text in Vim through putty

  - by shan23

  I'm using vim 6.3.81 on a xterm through putty. When I use set mouse=a , I can scroll through the file , but not select text. When mouse is disabled using set mouse=, I can select text with mouse (automatically copied to a buffer) , but if the text block is over one page long , I can't scroll up/down (and have to select text one screen at a time) !! Is there any way to have the best of both - while selecting text with mouse , if i reach the end of page , it automatically scrolls up/down depending on whether i've reached top/bottom of page and allows me to select text from the next page as well ? I know vim is powerful/flexible enough to do what I want - I just don't know how !! Can anyone help ?

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• Best way to mark an inherited class as NOT serializable

  - by initialZero

  If I inherit from a class that is serializable but I specifically do not want my class to be serializable; what's the best way to strictly prevent serialization? If there was a method in java.io.Serializable maybe I could throw an exception, but Serializable is empty.

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• Compiled Haskell libraries with FFI imports are invalid when imported into GHCI

  - by John Millikin

  I am using GHC 6.12.1, in Ubuntu 10.04 When I try to use the FFI syntax for static storage, only modules running in interpreted mode (ie GHCI) work properly. Compiled modules have invalid pointers, and do not work. I'd like to know whether anybody can reproduce the problem, whether this an error in my code or GHC, and (if the latter) whether it's a known issue. I'm using sys_siglist because it's present in a standard library on my system, but I don't believe the actual storage used matters (I discovered this while writing a binding to libidn). If it helps, sys_siglist is defined in <signal.h> as: extern __const char *__const sys_siglist[_NSIG]; I thought this type might be the problem, so I also tried wrapping it in a plain C procedure: #include<stdio.h> const char **test_ffi_import() { printf("C think sys_siglist = %X\n", sys_siglist); return sys_siglist; } However, importing that doesn't change the result, and the printf() call prints the same pointer value as show siglist_a. My suspicion is that it's something to do with static and dynamic library loading. Update: somebody in #haskell suggested this might be 64-bit specific; if anybody tries to reproduce it, can you mention your architecture and whether it worked in a comment? Code as follows: -- A.hs {-# LANGUAGE ForeignFunctionInterface #-} module A where import Foreign import Foreign.C foreign import ccall "&sys_siglist" siglist_a :: Ptr CString -- -- B.hs {-# LANGUAGE ForeignFunctionInterface #-} module B where import Foreign import Foreign.C foreign import ccall "&sys_siglist" siglist_b :: Ptr CString -- -- Main.hs {-# LANGUAGE ForeignFunctionInterface #-} module Main where import Foreign import Foreign.C import A import B foreign import ccall "&sys_siglist" siglist_main :: Ptr CString main = do putStrLn $ "siglist_a = " ++ show siglist_a putStrLn $ "siglist_b = " ++ show siglist_b putStrLn $ "siglist_main = " ++ show siglist_main peekSiglist "a " siglist_a peekSiglist "b " siglist_b peekSiglist "main" siglist_main peekSiglist name siglist = do ptr <- peekElemOff siglist 2 str <- maybePeek peekCString ptr putStrLn $ "siglist_" ++ name ++ "[2] = " ++ show str I would expect something like this output, where all pointer values identical and valid: $ runhaskell Main.hs siglist_a = 0x00007f53a948fe00 siglist_b = 0x00007f53a948fe00 siglist_main = 0x00007f53a948fe00 siglist_a [2] = Just "Interrupt" siglist_b [2] = Just "Interrupt" siglist_main[2] = Just "Interrupt" However, if I compile A.hs (with ghc -c A.hs), then the output changes to: $ runhaskell Main.hs siglist_a = 0x0000000040378918 siglist_b = 0x00007fe7c029ce00 siglist_main = 0x00007fe7c029ce00 siglist_a [2] = Nothing siglist_b [2] = Just "Interrupt" siglist_main[2] = Just "Interrupt"

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• WinForms/Console application on Mono, how to know it runs as root

  - by Lex Li-MSFT

  As we can execute such executables in two ways, such as "sudo mono test.exe", and "mono test.exe". Now I want to know how to detect whether this application is running as root inside the application itself. I tried to check user name like below and see whether they equal to "root", Thread.CurrentPrincipal.Identity.Name Process.GetCurrentProcess().StartInfo.UserName AppDomain.CurrentDomain.ApplicationIdentity.FullName The first two are empty strings always, while the third throws NullReferenceException. Please advise if this is doable on Mono 2.6.

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• RFC: Whitespace's Assembly Mnemonics

  - by Noctis Skytower

  Request For Comment regarding Whitespace's Assembly Mnemonics What follows in a first generation attempt at creating mnemonics for a whitespace assembly language. STACK ===== push number copy copy number swap away away number MATH ==== add sub mul div mod HEAP ==== set get FLOW ==== part label call label goto label zero label less label back exit I/O === ochr oint ichr iint In the interest of making improvements to this small and simple instruction set, this is a second attempt. hold N Push the number onto the stack copy Duplicate the top item on the stack copy N Copy the nth item on the stack (given by the argument) onto the top of the stack swap Swap the top two items on the stack drop Discard the top item on the stack drop N Slide n items off the stack, keeping the top item add Addition sub Subtraction mul Multiplication div Integer Division mod Modulo save Store load Retrieve L: Mark a location in the program call L Call a subroutine goto L Jump unconditionally to a label if=0 L Jump to a label if the top of the stack is zero if<0 L Jump to a label if the top of the stack is negative return End a subroutine and transfer control back to the caller exit End the program print chr Output the character at the top of the stack print int Output the number at the top of the stack input chr Read a character and place it in the location given by the top of the stack input int Read a number and place it in the location given by the top of the stack What is the general consensus on the following revised list for Whitespace's assembly instructions? They definitely come from thinking outside of the box and trying to come up with a better mnemonic set than last time. When the previous python interpreter was written, it was completed over two contiguous, rushed evenings. This rewrite deserves significantly more time now that it is the summer. Of course, the next version of Whitespace (0.4) may have its instructions revised even more, but this is just a redesign of what originally was done in a few hours. Hopefully, the instructions make more sense to those new to programming jargon.

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• How to fill a Label.Text - Property via jQuery

  - by Jan-Frederik Carl

  Hello, I use ASP.NET and have a label control on my page, which I fill with the jQuery-Command $('#<%= myLabel.ClientID %>').html(content); .val() does not seem to work with this. Somehow, I have Problems getting the content in code-behind. In the code, the myLabel.Text-Property is still empty.

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• Using map/reduce for mapping the properties in a collection

  - by And

  Update: follow-up to MongoDB Get names of all keys in collection. As pointed out by Kristina, one can use Mongodb 's map/reduce to list the keys in a collection: db.things.insert( { type : ['dog', 'cat'] } ); db.things.insert( { egg : ['cat'] } ); db.things.insert( { type : [] }); db.things.insert( { hello : [] } ); mr = db.runCommand({"mapreduce" : "things", "map" : function() { for (var key in this) { emit(key, null); } }, "reduce" : function(key, stuff) { return null; }}) db[mr.result].distinct("_id") //output: [ "_id", "egg", "hello", "type" ] As long as we want to get only the keys located at the first level of depth, this works fine. However, it will fail retrieving those keys that are located at deeper levels. If we add a new record: db.things.insert({foo: {bar: {baaar: true}}}) And we run again the map-reduce +distinct snippet above, we will get: [ "_id", "egg", "foo", "hello", "type" ] But we will not get the bar and the baaar keys, which are nested down in the data structure. The question is: how do I retrieve all keys, no matter their level of depth? Ideally, I would actually like the script to walk down to all level of depth, producing an output such as: ["_id","egg","foo","foo.bar","foo.bar.baaar","hello","type"] Thank you in advance!

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• Where are Kohana config files?

  - by elmonty

  I've just installed Kohana 3.0.4.2 and I have run the index.php file successfully. According to the documentation, the next step is to edit the config files in the application/config folder. I have that folder but there are no files in it! I downloaded the package again to make sure it wasn't corrupted, but the same problem exists. Why is the application/config folder empty?

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• Slime in emacs seems has conflicts with autopair

  - by Boris

  I have just install slime in emacs. And after removed all the other plugins for debuging, I found that slime seems had conflicts with autopair.(Or a bug of autopair?).In slime, when I typed C-c C-c, the minibuffer displayed error like: error in process filter: define-key: Wrong type argument: characterp, nil error in process filter: Wrong type argument: characterp, nil error in process filter: define-key: Wrong type argument: characterp, nil error in process filter: Wrong type argument: characterp, nil Even more, the error message still alerted after I killed the slime buffer. If I also remove the autopair plugin, slime works just fine. Can anyone tell me how to solve this? Thanks. :)

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• Socket : can an asynchronous Receive returns without reading all the bytes I asked for?

  - by NorthWind

  Hi; I was reading an article on Vadym Stetsiak's blog about how to transfer variable length messages with async sockets (url: http://vadmyst.blogspot.com/2008/03/part-2-how-to-transfer-fixed-sized-data.html). He says : What to expect when multiple messages arrive at the server? While dealing with multiple messages one has to remember that receive operation can return arbitrary number of bytes being read from the net. Typically that size is from 0 to specified buffer length in the Receive or BeginReceive methods. So, even if I tell BeginReceive to read 100 bytes, it may read less than that and returns??? I am developing a network-enabled software (TCP/IP), and I always receive the same exact number of bytes I asked for. I don't even understand the logic : why would Receive completes asynchronously if it didn't get every byte I asked for ... just keep waiting. Maybe it has something to do with IP vs TCP? Thank you for your help.

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• Android PCM Bytes

  - by Pintac

  Hi I am using the AudioRecord class to analize raw pcm bytes as it comes in the mic. So thats working nicely. Now i need convert the pcm bytes into decibel. I have a formula that takes sound presure in Pa into db. db = 20 * log10(Pa/ref Pa) So the question is the bytes i am getting from audiorecorder from the buffer what is it is it amplitude pascal sound pressure or what. I tried to putting the value into te formula but it comes back with very hight db so i do not think its right thanks

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• JavaScript: What would cause setInterval to stop firing?

  - by Rosarch

  I am writing a chat AJAX app. Randomly, in FF 3.5.9, setInterval() seems to stop firing. I don't have clearInterval() anywhere in my code. What could be causing this to happen? $(document).ready(function () { $("#no-js-warning").empty(); messageRefresher = new MessageRefresher(0); setInterval($.proxy(messageRefresher, "refresh"), 2000); }); function notifyInRoom(user) { $.getJSON('API/users_in_room', { room_id: $.getUrlVar('key'), username: user }, function (users) { if (!$.isEmptyObject(users)) { $("#users").empty(); $.each(users, function (index, username) { var newChild = sprintf("<li>%s</li>", username); $("#users").append(newChild); }); } else { $("#users-loading-msg").text("No one is in this room."); } }); } function MessageRefresher(latest_mid) { this._latest_mid = latest_mid; } MessageRefresher.prototype.refresh = function () { notifyInRoom($("#user-name").val()); var refresher = this; $.getJSON('API/read_messages', { room_id: $.getUrlVar('key'), mid: refresher._latest_mid }, function (messages) { if (! (messages == null || $.isEmptyObject(messages[0]))) { // messages will always be at least [[], [], 0] $("#messages-loading-msg").hide(); for (var i = 0; i < messages[0].length; i++) { var newChild = sprintf('<li><span class="username">%s:</span> %s</li>', messages[1][i], messages[0][i]); $("#messages").append(newChild); } refresher._latest_mid = messages[2]; setUserBlockClass(); } else { $("#messages-loading-msg").text("No messages here. Say anything..."); } }); } // Give the end-user-block class to the appropriate messages // eg, those where the next message is by a different user function setUserBlockClass() { $("#messages li").each(function (index) { if ($(this).children(".username").text() != $(this).next().children(".username").text()) { $(this).addClass("end-user-block"); } }); } I checked the most recent responses in Firebug, and it was the same responses that had been sent earlier. (So, it's not like an unusual response caused a crash.) If I refresh the page, the calls resume.

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• STOP ERASING MY QUESTIONS! - VIEWING FIRST_ROWS BEFORE QUERY COMPLETES (RE-VISITED)

  - by Frank Developer

  OK, so say I have a table with 500K rows, then I ad-hoc query with unsupported indexing which requires a full table scan. I would like to immediately view the first rows returned while the full table scan continues. Then I want to scroll thru the next results. In the meantime, I would like to display the progress of the table scan, example: "SEARCHING.. FOUND 23 OF 500,000 ROWS SO FAR". If I scroll too far ahead, I want to display a message like: "REACHED LAST ROW IN LOOK-AHEAD BUFFER.. QUERY HAS NOT COMPLETED".. Can this be done? Maybe like: spawn/exec, declare scroll cursor, open, fetch, etc.?

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• ajax(search suggest) funny character problem

  - by Jason

  ajax(search suggest), if input funny character(like Ô) to search it, "?" is displayed in firefox or empty box is displayed in IE. i am using xmlhttp.open("post", "*****.asp", true); xmlhttp.setRequestHeader('Content-type','application/x-www-form-urlencoded; charset=UTF-8'); and there is <%@CODEPAGE=65001%> in *****.asp file how can i fix it?

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• Order Multidimensional Arrays PHP

  - by ronsandova

  Hi everyone I have some problem to order an array by a field of this, here i leave the example foreach($xml as $site){ echo '<div><a href="'.$site->loc.'">'.$site->loc.'</a>' .$site->padre.'</div>'; } Some times the filed $site->padre is empty but i'd like to order by $site->padre alphabetical i saw example with usort but i don't understand how to work it. Thanks in advance. Cheers

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• How to fill an HTML form with CSS ?

  - by misha-moroshko

  Hello, I have an HTML form with radio buttons, check boxes, text fields and drop down lists. Since I want user to fill everything in my form, none of the radio buttons and check boxes are checked and the text fields are empty. I would like to write a CSS file that will fill the form with answers (I don't want to change my HTML file). Is this possible ? I would appreciate an example or any other idea ? Thanks !

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• How do I conditionally format a WPF TextBlock?

  - by Scott Ferguson

  I have a WPF TextBlock bound to a string. If that string is empty, I want the TextBlock to display a warning message in another colour. This is easy to do in code, I was wondering if there was a elegant WPF pure XAML solution for it? I have investigated Style Triggers, but the syntax doesn't come naturally to me. Thanks!

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• Fast, lightweight XML parser

  - by joe90

  I have a specific format XML document that I will get pushed. This document will always be the same type so it's very strict. I need to parse this so that I can convert it into JSON (well, a slightly bastardized version so someone else can use it with DOJO). My question is, shall I use a very fast lightweight (no need for SAX, etc.) XML parser (any ideas?) or write my own, basically converting into a StringBuffer and spinning through the array? Basically, under the covers I assume all HTML parsers will spin thru the string (or memory buffer) and parse, producing output on the way through. Thanks //edit Thanks for the responses so far :) The xml will be between 3/4 lines to about 50 max (at the extreme)..

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• main.out.xml error

  - by husainsn

  Hello I installed Eclipse and Android ADT. When I create android project and try to run, I get following on main.out.xml file: This document is empty. Right click here to insert content However, main.xml file has xml data for layout. Please help what I need to do after right clicking. Thanks

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• JAX-WS wsgen and collections of collections: wsgen broken?

  - by ayang

  I've been playing around with "bottom-up" JAX-WS and have come across something odd when running wsgen. If I have a service class that does something like: @WebService public class Foo { public ArrayList<Bar> getBarList(String baz) { ... } } then running wsgen gets me a FooService_schema1.xsd that has something like this: <xs:complexType name="getBarListResponse"> <xs:sequence> <xs:element name="return" type="tns:bar" minOccurs="0" maxOccurs="unbounded"/> </xs:sequence> </xs:complexType> which seems reasonable. However, if I want a collection of collections like: public BarCollection getBarCollection(String baz) { ... } // BarCollection is just a container for an ArrayList<Bar> then the generated schema ends up with stuff like: <xs:complexType name="barCollection"> <xs:sequence/> </xs:complexType> <xs:complexType name="getBookCollectionsResponse"> <xs:sequence> <xs:element name="return" type="tns:barCollection" minOccurs="0" maxOccurs="unbounded"/> </xs:sequence> </xs:complexType> An empty sequence is not what I had in mind at all. My original approach was to go with: public ArrayList<ArrayList<Bar>> getBarLists(String baz) { ... } but that ends up with a big chain of complexTypes that just wind up with an empty sequence at the end as well: <xs:complexType name="getBarListsResponse"> <xs:sequence> <xs:element name="return" type="tns:arrayList" minOccurs="0" maxOccurs="unbounded"/> </xs:sequence> </xs:complexType> <xs:complexType name="arrayList"> <xs:complexContent> <xs:extension base="tns:abstractList"> <xs:sequence/> </xs:extension> </xs:complexContent> </xs:complexType> <xs:complexType name="abstractList" abstract="true"> <xs:complexContent> <xs:extension base="tns:abstractCollection"> <xs:sequence/> </xs:extension> </xs:complexContent> </xs:complexType> <xs:complexType name="abstractCollection" abstract="true"> <xs:sequence/> </xs:complexType> Am I missing something or is this a known hole in wsgen? JAXB? Andy

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• KohanaPHP redirection loop

  - by sorrko

  Hello, I got problem. I'm builing an app with KohanaPHP framework and I got rediretion endless loop. Here's the code I put in constructor oh my main controller: if(empty($this->user->real_name)) { url::redirect('/'); } Any ideas how to solve that issue?

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