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• change the class loading order google app engine java

  - by Shekhar

  I am trying to create an application on google app engine using struts2. Struts2 internally uses freemarker .One of the Freemarker framework classes suppose X internally uses a class javax.swing.Treenode which is not in google app engine jre white list. Now in order to run my application i created a new class X in the same package structure as it was in freemarker framework and copied the class to WEB-INF classes.Then When i run my application it run fine. The problem is that i want to take out the class X from my application sourcecode and move it to newly created jar and place it in WEB-INF/lib folder. So that i can reuse the code in multiple project and my code remains clean of the freemarker code. But when i run the application it picks the old class X from the original freemarker framework.As a result i get ClassNotFoundException. Can anyone provide any help such that i can change the ClassLoading order such that my jar containing X class loads first.

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• Join column with different collation issue

  - by George2

  Hello everyone, I am using SQL Server 2005. I have two tables, and they are using different collations. It is not allowed to concatenate columns from tables with different collations, for example the following SQL is not allowed, select table1column1 + table2column2 from ... My question is, why concatenation of two columns from different collations is not allowed from database engine design perspective? I do not know why collation will impact results, the result is just concatenating strings -- should be simple enough and not dependent on collation... thanks in advance, George

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• LINQ aggregate / SUM grouping problem

  - by Chrissi

  I'm having trouble getting my head around converting a traditional SQL aggregate query into a LINQ one. The basic data dump works like so: Dim result = (From i As Models.InvoiceDetail In Data.InvoiceDetails.GetAll Join ih As Models.InvoiceHeader In Data.InvoiceHeaders.GetAll On i.InvoiceHeaderID Equals ih.ID Join p As Models.Product In Data.Products.GetAll On i.ProductID Equals p.ID Join pg As Models.ProductGroup In Data.ProductGroups.GetAll On p.ProductGroupID Equals pg.ID Join gl As Models.GLAccount In Data.GLAccounts.GetAll On pg.GLAccountSellID Equals gl.ID Where (gl.ID = GLID) Select ih.Period,i.ExtendedValue) What I need to really be getting out is ih.Period (a value from 1 to 12) and a corresponding aggregate value for i.ExtendedValue. When I try to Group ih I get errors about i being out of scope/context, and I'm not sure how else to go about it.

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• Can I use ido-completing-read instead of completing-read everywhere?

  - by haxney

  I'm a big fan of ido-mode, so much so that I would like to use it for things like describe-function or find-tag and so on, without having to write something like in "Can I get ido-mode-style completion for searching tags in Emacs?" for each one. Both (defalias completing-read ido-completing-read) and (setf 'completing-read 'ido-completing-read) don't work, at least partly because ido-completing-read calls completing-read in its body, so any simple redefinition would result in infinite recursion. In theory, it should be possible, since the first line of the docstring for ido-completing-read is "Ido replacement for the built-in completing-read." I've looked around a bit and can't seem to find anyone else who has attempted or succeeded at it. I realize that Icicles [2] probably provides something like this, and I may end up going with that anyway, but it is a bit more of a plunge than I care to take right now. Thanks for any help.

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• Problems with installing jcc and pylucene

  - by Christian

  I'm trying to install pylucene on Windows XP. I installed JDK on C:\Programme\Java\jdk1.6.0_18 . I also installed Visual Studio C++ Express to have a C++ compiler. As first step I'm trying to integrate jcc into python2.6 through the command: C:\Python26\python.exe setup.py build This gives me the following result: C:\Installfiles\pylucene-3.0.1-1\jcc>C:\Python26\python.exe setup.py build Traceback (most recent call last): File "setup.py", line 332, in <module> main('--debug' in sys.argv) File "setup.py", line 289, in main raise type(e), "%s: %s" %(e, args) WindowsError: [Error 2] Das System kann die angegebene Datei nicht finden: ['jav ac.exe', '-d', 'jcc/classes', 'java/org/apache/jcc/PythonVM.java', 'java/org/apa che/jcc/PythonException.java'] Other information: In systems I set: Uservariables: CLASSPATH C:\Programme\Java\jdk1.6.0_18\bin\javac.exe System Variables Path %SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem; C:\Programme\Java\jdk1.6.0_18\bin Where does the error come from and what do I have to do to overcome it?

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• Floating point arithmetic is too reliable.

  - by mcoolbeth

  I understand that floating point arithmetic as performed in modern computer systems is not always consistent with real arithmetic. I am trying to contrive a small C# program to demonstrate this. eg: static void Main(string[] args) { double x = 0, y = 0; x += 20013.8; x += 20012.7; y += 10016.4; y += 30010.1; Console.WriteLine("Result: "+ x + " " + y + " " + (x==y)); Console.Write("Press any key to continue . . . "); Console.ReadKey(true); } However, in this case, x and y are equal in the end. Is it possible for me to demonstrate the inconsistency of floating point arithmetic using a program of similar complexity, and without using any really crazy numbers? I would like, if possible, to avoid mathematically correct values that go more than a few places beyond the decimal point.

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• Inserting mutable pairs into a mutable list

  - by Romelus

  How can I push a mutable pair onto a stack such that i'm only creating one stack. I have some code that works but creates lists within lists within lists.... Here is what I believe should work but throws an error. (define func (arg1 arg2 arg3) // Where arg3 is an empty list (mappend (mcons arg1 arg2) arg3)) The above code complains and says: "mcar: expects argument of type ; given ... Can anyone show me how I can get a result that looks like so,: (list (arg1 arg2) (arg# arg#) ...)

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• Can a ScatterViewItem dynamically resize to fit its content?

  - by Brett

  We're hosting a control inside of a ScatterViewItem that dynamically changes its size at runtime as a result of having various sub-elements added, removed, and/or collapsed. We would like to have the hosting ScatterViewItem resize as well to properly fit its child controls, but we're having a hard time making this happen. We've tried a number of different things and the closest we've come is hooking into the child control's SizeChanged event and explicitly setting the ScatterViewItem's Width and Height, but this approach still has issues. When you define a ScatterViewItem and its content in XAML, the ScatterViewItem is sized appropriately. We would like to force the same behavior at runtime when its content changes size. Any help would be greatly appreciated. Thanks!

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• Apple Push notifications server - Feedback always returns zero tuples

  - by Franz

  Hi, I am developing an iPhone App that uses Apple Push Notifications. On the iPhone side everything is fine, on the server side I have a problem. Notifications are sent correctly however when I try to query the feedback service to obtain a list of devices from which the App has been uninstalled, I always get zero results. I know that I should obtain one result as the App has been uninstalled from one of my test devices. After 24 hours and more I still have no results from the feedback service.. Any ideas? Does anybody know how long it takes for the feedback service to recognize that my App has been uninstalled from my test device? Could it be due to the sandbox environment?

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• Recursion and Iteration

  - by Doug

  What is the difference? Are these the same? If not, can someone please give me an example? MW: Iteration - 1 : the action or a process of iterating or repeating: as a : a procedure in which repetition of a sequence of operations yields results successively closer to a desired result b : the repetition of a sequence of computer instructions a specified number of times or until a condition is met Recusion - 3 : a computer programming technique involving the use of a procedure, subroutine, function, or algorithm that calls itself one or more times until a specified condition is met at which time the rest of each repetition is processed from the last one called to the first

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• importing an existing x509 certificate and private key in Java keystore to use in ActiveMQ ssl context

  - by Aleksandar Ivanisevic

  I have this in activemq config <sslContext> <sslContext keyStore="file:/home/alex/work/amq/broker.ks" keyStorePassword="password" trustStore="file:${activemq.base}/conf/broker.ts" trustStorePassword="password"/> </sslContext> I have a pair of x509 cert and a key file How do I import those two to be used in ssl and ssl+stomp connectors? All examples i could google always generate the key themselves, but I already have a key. I have tried keytool -import -keystore ./broker.ks -file mycert.crt but this only imports the certificate and not the key file and results in 2009-05-25 13:16:24,270 [localhost:61612] ERROR TransportConnector - Could not accept connection : No available certificate or key corresponds to the SSL cipher suites which are enabled. I have tried concatenating the cert and the key but got the same result How do I import the key?

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• Why does my 64-bit IIS app pool show 3 gigabytes more virtual memory than private memory?

  - by Brett

  I have an ASP.Net application that I am running on 64-bit IIS 6 on Windows XP x64. When I open performance counters after one page hit of a trivial page, I see a Private Bytes of about 88 megs, but a Virtual Bytes of about 3 Gigs. When I try the same thing with a VERY trivial ASP.Net app, I get the same result. We see something similar on Windows Server 2003 in production -- there it is an issue because we recycle when the virtual memory consumed outgrows a limit. Before we make any changes to our recycling settings, we'd like to answer the following questions: Why does the app pool grab such a large hunk of virtual memory? Is the amount of virtual memory headroom the app requests configurable? Thanks! Brett

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• Novel fitness measure for evolutionary image matching simulation

  - by Nick Johnson

  I'm sure many people have already seen demos of using genetic algorithms to generate an image that matches a sample image. You start off with noise, and gradually it comes to resemble the target image more and more closely, until you have a more-or-less exact duplicate. All of the examples I've seen, however, use a fairly straightforward pixel-by-pixel comparison, resulting in a fairly predictable 'fade in' of the final image. What I'm looking for is something more novel: A fitness measure that comes closer to what we see as 'similar' than the naive approach. I don't have a specific result in mind - I'm just looking for something more 'interesting' than the default. Suggestions?

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• Given a string describing a Javascript function. convert it to a Javascript function

  - by brainjam

  Say I've got a Javascript string like the following var fnStr = "function(){blah1;blah2;blah3; }" ; (This may be from an expression the user has typed in, duly sanitized, or it may be the result of some symbolic computation. It really doesn't matter). I want to define fn as if the following line was in my code: var fn = function(){blah1;blah2;blah3; } ; How do I do that? The best I've come up with is the following: var fn = eval("var f = function(){ return "+fnStr+";}; f() ;") ; This seems to do the trick, even though it uses the dreaded eval(), and uses a slightly convoluted argument. Can I do better? I.e. either not use eval(), or supply it with a simpler argument?

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• python: how to convert list of lists into a single nested list

  - by Bhuski

  I have a python list of lists as shown below: mylist=[ [['orphan1', ['some value1']]], [['parent1', ['child1', ['child', ['some value2']]]]], [['parent1', ['child2', ['child', ['some value3']]]]] ] I need to convert the above list to some thing like this: result=[ ['orphan1', ['some value1']], ['parent1', ['child1', ['child', ['some value2']]], ['child2', ['child', ['some value3']]]] ] Kindly help me approach this problem. I have given only simple list. In actual scenario here, in my list, even grand parents/grand childs are there. How much ever deep the input nested list is, I need to convert it to a single nested list, with common list elements (parents and grand parents) appearing only once. (but the next to innermost list element('child' in above example) should appear as many times it occurs in the input list. I have been trying to do this last two days, but did not end up with working solution :(. I need to use the output in django template filter: unordered_list so that the resultant nested list appears as a nested unordered list in my html page ..

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• How to make a POST request with python-webkit?

  - by shakaran

  Hi, I new using python + webkit. I need make a POST request with webkit, but I dont know how to it. I use python-webkit because my app load a form on the GUI (for vote, comments and send more data) and I need post all these data with a POST request and load the html result send for the server to my GUI app with python-webkit. I have only this example with urllib: #!/usr/bin/python import urllib2, urllib import httplib server = 'server.somesite.com' data = {'name' : 'shakaran', 'password' : 'Only_I_know'} d = urllib.urlencode(data) headers = {"Content-type": "application/x-www-form- urlencoded", "Accept": "text/plain"} conn = httplib.HTTPConnection(server) conn.request("POST", "/login.php", d, headers) response = conn.getresponse() if response.status == 200: print response.status, response.reason print response.getheaders() data = response.read() print data conn.close() I need a simple example with webkit. I look in the documentation for Webkit.HTTPRequest http://www.webwareforpython.org/WebKit/Docs/Source/Docs/WebKit.HTTPRequest.html I try with webkit.NetworkRequest() but I don't know how to it. Some help? Thanks

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• Resetting or refreshing a database connection

  - by cdonner

  This Android application on Google uses the following method to refresh the database after replacing the database file with a backup: public void resetDbConnection() { this.cleanup(); this.db = SQLiteDatabase.openDatabase( "/data/data/com.totsp.bookworm/databases/bookworm.db", null, SQLiteDatabase.OPEN_READWRITE); } I did not build this app, and I am not sure what happens. I am trying to make this idea work in my own application, but the data appears to be cached by the views, and the app continues to show data from the database that was replaced, even after I call cleanup() and reopen the database. I have to terminate and restart the activity in order to see the new data. I tried to call invalidate on my TabHost view, which pretty much contains everything. I thought that the views would redraw and refresh their underlying data, but this did also not have the expected result. I ended up restarting the activity programmatically, which works, but this seems to be a drastic measure. Is there a better way?

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• MDE Access decrypt JDBC

  - by michelemarcon

  I want to perform JDBC SQL queries on a MDE Access file. I've set up the data source ODBC and everything worked well for a MDE file. Now, I'm working with a newer version of the MDE file, and here is the result: java.sql.SQLException: [Microsoft][Driver ODBC Microsoft Access] Cannont read record. Read authorization unavailable for "tbl_mytable". If I open the MDE with Access Runtime I am asked for a password, and after leaving a blank password I can see all the data. Of course, "tbl_mytable" does exist inside the database.

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• How to get all rows but specifc columns from a DataTable?

  - by Oliver

  Currently i am having some problems with getting some data out of a DataTable by selecting all rows, but only some columns. To be a little more descriptive here is a little example: Sample Data | ID | FirstName | LastName | Age | +----+-----------+----------+-----+ | 1 | Alice | Wannabe | 22 | | 2 | Bob | Consumer | 27 | | 3 | Carol | Detector | 25 | What i have So what we got from our GUI is a IEnumerable<DataColumn> selectedColumns and there we'll find two elements (FirstName and LastName). Now i need some result which contains all rows, but only the above two columns (or any other list of selected columns). So far i already used LINQ on several one dimensional objects, but this two dimensional object gives me a little headache. // The hard-coded way Table.AsEnumerable().Select(row => new { FirstName = row[1], LastName = row[2] }); // The flexible way Table.AsEnumerable().Select(row => row ???) But how can i now say, which columns from row should be selected by using my selectedColumns?

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• Java dropping half of UDP packets

  - by Andrew Klofas

  Greetings, I have a simple client/server setup. The server is in C and the client that is querying the server is Java. My problem is that, when I send bandwidth-intensive data over the connection, such as Video frames, it drops up to half the packets. I make sure that I properly fragment the udp packets on the server side (udp has a max payload length of 2^16). I verified that the server is sending the packets (printf the result of sendto()). But java doesn't seem to be getting half the data. Furthermore, when I switch to TCP, all the video frames get through but the latency starts to build up, adding several seconds delay after a few seconds of runtime. Is there anything obvious that I'm missing? I just can't seem to figure this out. Thanks, Andrew

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• Matrix inversion in OpenCL

  - by buchtak

  Hi, I am trying to accelerate some computations using OpenCL and part of the algorithm consists of inverting a matrix. Is there any open-source library or freely available code to compute lu factorization (lapack dgetrf and dgetri) of matrix or general inversion written in OpenCL or CUDA? The matrix is real and square but doesn't have any other special properties besides that. So far, I've managed to find only basic blas matrix-vector operations implementations on gpu. The matrix is rather small, only about 60-100 rows and cols, so it could be computed faster on cpu, but it's used kinda in the middle of the algorithm, so I would have to transfer it to host, calculate the inverse, and then transfer the result back on the device where it's then used in much larger computations.

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• M a java developer struggling with jQuery :(

  - by Mustafa

  Guys i am very new to jQuery.I have started using the auto complete feature.What i want is while i click on an item provided by the auto complete the page should submit to another page.I am using : $().ready(function() { $("#name").autocomplete("contacts.jsp"); $("#name").result(function(event, data, formatted) { if (data) $(this).parent().next().find("input").val(data[1]); }); $("#name").setOptions({ mustMatch : false, max: 8, onClick:selectItem, autoFill: false }); }); And this gives me good data like :Aditi XaveirAsif Garhietc for 'A'Now what i want is on clicking Aditi Xaveir, the page should submit to AditiXaveir's profile page.How do i do that?

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• transform List<XElement> to List<XElement.Value>

  - by Miau

  I have a result of a xlinq that is an enumerable with id and phones, I want to transform that to a Dictionary, that part is simple, however the part of transforming the phone numbers from a XElement to a string its proving hard xLinqQuery.ToDictionary(e => e.id, e => e.phones.ToList()); will return Dictionary<int, List<XElement>> what i want is a Dictionary<int, List<String>> I tried with e.phones.ToList().ForEach(...) some strange SelectMany, etc ot no avail Thanks

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• WCF Paged Results & Data Export

  - by Ben

  I've walked into a project that is using a WCF service for the data tier. Currently, when data is needed for a grid, all rows are returned and the results are bound to a grid and the dataset is stuffed into a session variable for paging/sorting/rebinding. We've already hit a max message size problem, so I'm thinking it's time to convert from fetch and cache to fetch only the current page. Face value this seems easy enough, but there's a small catch. The user is allowed to export the entire result set at any point. This means that for grid viewing purposes fetching the current page is fine, but when they want to do an export, I still need to make a call for all data. This puts me back into the max message size issue. What is the recommended approach for this type of setup? We are currently using the wsHttpBinding... Thanks for any assistance.

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• Problems Executing iPhone "GenericKeychain" Example

  - by AO

  I can't get apple's "GenericKeychain" example to run. I have replaced all 5 occurrences, as mentioned in the readme file, of "YOUR_APP_ID_HERE.com.yourcompany" with my own string: se.[company name].[project name].demo. The compilation goes fine but when trying to run it on the phone, an error saying "The executable was signed with invalid entitlements" appears. And yes, I have an ad hoc provisioning profile installed. I've tried to add "Entitlements.plist" with "get-task-allow" checked but with the same result. Has anyone been able to run the example? If that is the case, provide me with instructions on how you got it to run, please. URL: http://developer.apple.com/iphone/library/samplecode/GenericKeychain/index.html

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