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• Using R in Processing through rJava/JRI?

  - by tommy-o-dell

  Hi guys, Is it possible to run R in Processing through rJava/JRI? If I deployed a Processing app on the web, would the client need R on their system? I'm looking to create an interactive information dashboard that I can deploy on the web. It seems that Processing is probably my best bet for the interactive/web part of things. Unfortunately, it doesn't look like there are many math/stats functions built-in. And there aren't any libraries for plotting data either. I've been using R and gpplot2 for a few months and am thrilled (amazed) at how easily it manipulates and plots data. So I'm wondering now if can get the best of both worlds and run R through a Processing applet. From the JRI website: JRI is a Java/R Interface, which allows to run R inside Java applications as a single thread. Basically it loads R dynamic library into Java and provides a Java API to R functionality. It supports both simple calls to R functions and a full running REPL. In a sense JRI is the inverse of rJava and both can be combined (i.e. you can run R code inside JRI that calls back to the JVM via rJava). The JGR project makes the full use of both JRI and rJava to provide a full Java GUI for R. JRI uses native code, but it supports all platforms where Sun's Java (or compatible) is available, including Windows, Mac OS X, Sun and Linux (both 32-bit and 64-bit). Thanks for the advice :)

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• Can't get past "A potentially dangerous Request.Form value was detected..." error

  - by joshb

  I'm doing my first ASP.NET MVC2 project and I can't get past the "A potentially dangerous Request.Form value was detected..." error when trying to submit a form. I've done this in MVC1 using the ValidateInputAttribute and I've read about the breaking change in .NET 4 that requires setting the request validation mode in the web.config. Basically I'm doing exactly what is outlined in this thread: http://stackoverflow.com/questions/2019843/a-potentially-dangerous-request-form-value-in-mvc-2-asp-net-4-0. Nothing's working though so I must be missing something. Here's my code: Web.config <configuration> <system.web> <httpHandlers> <add path="*" verb="*" type="System.Web.HttpNotFoundHandler"/> </httpHandlers> <httpRuntime requestValidationMode="2.0" /> <pages validateRequest="true" pageParserFilterType="System.Web.Mvc.ViewTypeParserFilter, System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" pageBaseType="System.Web.Mvc.ViewPage, System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" userControlBaseType="System.Web.Mvc.ViewUserControl, System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35"> <controls> <add assembly="System.Web.Mvc, Version=2.0.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35" namespace="System.Web.Mvc" tagPrefix="mvc" /> </controls> </pages> </system.web> <system.webServer> <validation validateIntegratedModeConfiguration="false" /> <handlers> <remove name="BlockViewHandler"/> <add name="BlockViewHandler" path="*" verb="*" preCondition="integratedMode" type="System.Web.HttpNotFoundHandler" /> </handlers> </system.webServer> </configuration> Controller action [AcceptVerbs(HttpVerbs.Post)] [ValidateInput(false)] public ActionResult Edit(Page pageToEdit) { // do stuff.... } Any ideas on what I'm doing wrong here?

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• Create 2 connection pools using c3p0 in Jetty

  - by Mike

  Hello, I'm trying to set up a maven web project that runs Jetty. In this project, I need 2 JNDIs... my plan is to configure 2 connection pools using c3p0 in Jetty. So, I created WEB-INF/jetty-env.xml, and I have the following:- <Configure class="org.mortbay.jetty.webapp.WebAppContext"> <New id="ds1" class="org.mortbay.jetty.plus.naming.Resource"> <Arg>jdbc/ds1</Arg> <Arg> <New class="com.mchange.v2.c3p0.ComboPooledDataSource"> // ... JTDS to SQL Server - omitted for brevity </New> </Arg> </New> <New id="ds2" class="org.mortbay.jetty.plus.naming.Resource"> <Arg>jdbc/ds2</Arg> <Arg> <New class="com.mchange.v2.c3p0.ComboPooledDataSource"> // ... JTDS to Sybase - omitted for brevity </New> </Arg> </New> </Configure> When I run jetty, I get this exception:- May 14, 2010 1:16:56 PM com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource getPoolManager INFO: Initializing c3p0 pool... com.mchange.v2.c3p0.ComboPooledDataSource [ acquireIncrement -> ... ... ... Exception in thread "com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0" java.lang.LinkageError: net.sourceforge.jtds.jdbc.DefaultProperties at java.lang.ClassLoader.defineClassImpl(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:258) It seems to me that I can't create 2 connection pools using c3p0. If I remove either one of the connection pool, it worked. What am I doing wrong? How do I create 2 connection pools in Jetty? Thanks much.

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• Reading from serial port with Boost Asio?

  - by trikri

  Hi! I'm going to check for incoming messages (data packages) on the serial port, using Boost Asio. Each message will start with a header that is one byte long, and will specify which type of the message has been sent. Each different type of message has an own length. The function I'm about to write should check for new incoming messages continually, and when it finds one it should read it, and then some other function should parse it. I thought that the code might look something like this: void check_for_incoming_messages() { boost::asio::streambuf response; boost::system::error_code error; std::string s1, s2; if (boost::asio::read(port, response, boost::asio::transfer_at_least(0), error)) { s1 = streambuf_to_string(response); int msg_code = s1[0]; if (msg_code < 0 || msg_code >= NUM_MESSAGES) { // Handle error, invalid message header } if (boost::asio::read(port, response, boost::asio::transfer_at_least(message_lengths[msg_code]-s1.length()), error)) { s2 = streambuf_to_string(response); // Handle the content of s1 and s2 } else if (error != boost::asio::error::eof) { throw boost::system::system_error(error); } } else if (error != boost::asio::error::eof) { throw boost::system::system_error(error); } } Is boost::asio::streambuf is the right thing to use? And how do I extract the data from it so I can parse the message? I also want to know if I need to have a separate thread which only calls this function, so that it get called more often? Isn't there a risk for loosing data in between two calls to the function otherwise, because so much data comes in that it can't be stored in the serial ports memory? I'm using Qt as a widget toolkit and I don't really know how long time it needs to process all it's events.

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• Delphi - Message loop for Form created in DirectShow filter goes dead

  - by Robert Oschler

  I have a DirectShow filter created with Delphi Pro 6 and the DSPACK direct show library. I'm running under windows XP. I've tried creating the form dynamically when the container class for the DirectFilter has its constructor called, passing NIL into the constructor as the AOwner parameter (TMyForm.Create(nil) and then calling the Form's Show() method. The form does show but then appears to stop receiving windows messages because it never repaints and does not respond to input. As a test I then tried creating my own WndProc() and overriding the Form's WndProc(). My WndProc() did get called once but never again. I'm guessing it's because I'm a DLL and the context that I am running in is not "friendly" to the window message handler for the form; perhaps something to do with the thread that calls it or whatever. If someone could give me a tip on how to solve this or what the proper way to create a persistent window is from the context of a DirectShow filter I'd appreciate it. Note, as I said the window needs to be persistent so I can't create it as a Filter property page. Thanks, Robert

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• No output from exception

  - by Grasper

  Why does this code not print an exception stack trace? import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.TimeUnit; public class Playground { /** * @param args */ public static void main(String[] args) { startThread(); } private static void startThread() { ScheduledExecutorService timer = Executors .newSingleThreadScheduledExecutor(); Runnable r = new Runnable() { int dummyInt = 0; boolean dummyBoolean = false; @Override public void run() { dummyInt = Integer.parseInt("AAAA"); if (dummyBoolean) { dummyBoolean= false; } else { dummyBoolean= true; } } }; timer.scheduleAtFixedRate(r, 0, 100, TimeUnit.MILLISECONDS); } } How can I get it to? I would expect to see this: java.lang.NumberFormatException: For input string: "AAAA" at java.lang.NumberFormatException.forInputString(Unknown Source) at java.lang.Integer.parseInt(Unknown Source) at java.lang.Integer.parseInt(Unknown Source) at Playground$1.run(Playground.java:25) at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) at java.util.concurrent.FutureTask$Sync.innerRunAndReset(Unknown Source) at java.util.concurrent.FutureTask.runAndReset(Unknown Source) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$101(Unknown Source) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.runPeriodic(Unknown Source) at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source)

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• resolving overloads in boost.python

  - by swarfrat

  I have a C++ class like this: class ConnectionBase { public: ConnectionBase(); template <class T> Publish(const T&); private: virtual void OnEvent(const Overload_a&) {} virtual void OnEvent(const Overload_b&) {} }; My templates & overloads are a known fixed set of types at compile time. The application code derives from ConnectionBase and overrides OnEvent for the events it cares about. I can do this because the set of types is known. OnEvent is private because the user never calls it, the class creates a thread that calls it as a callback. The C++ code works. I have wrapped this in boost.python, I can import it and publish from python. I want do create the equivalent of the following in python : class ConnectionDerived { public: ConnectionDerived(); private: virtual void OnEvent(const Overload_b&) { // application code } }; But ... since python isn't typed, and all the boost.python examples I've seen dealing with internals are on the C++ side, I'm a little puzzled as to how to do this. How do I override specific overloads?

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• Jsystem AutoITAgent does not work - java.lang.NoClassDefFoundError: org/apache/xmlrpc/WebServer

  - by lasombra

  Even so the jar files exists and are in the correct folder, I get the NoClassDefFoundError. Why? What I am doing wrong? The Classpath definition is .\thirdparty\lib\;C:\jsystem\runner\lib\ant-jsystem.jar;C:jsystem\runner\lib\cli.jar;C:\jsystem\runner\lib\commons-logging-1.1.jar;C:\jsystem\runner\lib\embeddedCatalina.jar;C:\jsystem\runner\lib\fileParser.jar;C:\jsystem\runner\lib\filetransfer.jar;C:\jsystem\runner\lib\j2autoit.jar;C:\jsystem\runner\lib\jsystem-launcher.jar;C:\jsystem\runner\lib\jsystemAgent.jar;C:\jsystem\runner\lib\jsystemApp.jar;C:\jsystem\runner\lib\jsystemCommon.jar;C:\jsystem\runner\lib\jsystemCore.jar;C:\jsystem\runner\lib\snmp.jar;C:\jsystem\runner\lib\stations.jar;C:\jsystem\runner\lib\swing.jar;C:\jsystem\runner\lib\tcl.jar;C:\jsystem\runner\lib\vbshell.jar;C:\jsystem\runner\lib\web.jar;C:\jsystem\runner\lib\wget.jar; C:\jsystem\runner\lib\xmlrpc-client-3.1.3.jar; C:\jsystem\runner\lib\xmlrpc-common-3.1.3.jar; C:\jsystem\runner\lib\xmlrpc-server-3.1.3.jar; C:\jsystem\runner\lib\j2autoit\j2autoit.jar C:\jsystem\runner Setting J2AutoIt Agent to use the port: 8888 Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/xmlrpc/WebServer at com.jsystem.j2autoit.AutoItAgent.startAutoItWebServer(AutoItAgent.java:665) at com.jsystem.j2autoit.AutoItAgent.main(AutoItAgent.java:348) Caused by: java.lang.ClassNotFoundException: org.apache.xmlrpc.WebServer at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClassInternal(Unknown Source) ... 2 more

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• Call long running operation in WSS feature OnActivated Event

  - by dirq

  More specifically - How do I reference SPContext in Web Service with [SoapDocumentMethod(OneWay=true)]? We are creating a feature that needs to run a job when a site is created. The job takes about 4 minutes to complete. So, we made a web service that we can call when the feature is activated. This works but we want it to run asynchronously now. We've found the SoapDocumentMethod's OneWay property and that would work awesomely but the SPContext is now NULL. We have our web services in the _vti_bin virtual directory so it's available in each Windows Sharepoint Services site. I was using the SPContext.Current.Web to get the site and perform the long running operation. I wanted to just fire and forget about it by returning a soap response right away and letting the process run. How can I get the current SPContext? I used to be able to do this in my web service: SPWeb mySite = SPContext.Current.Web; Can I get the same context when I have the [SoapDocumentMethod(OneWay=true)] attribute applied to my web service? Or must I recreate the SPWeb from the url? This is similar to this thread: http://stackoverflow.com/questions/340192/webservice-oneway-and-new-spsitemyurl Update: I've tried these two ways but they didn't work: SPWeb targetSite = SPControl.GetContextWeb(this.Context); SPWeb targetSite2 = SPContext.GetContext(this.Context).Web;

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• Compile MonoDevelop 4.2.3

  - by user2942643

  I need help, I'm trying to compile monodevelop code, but when I use the command "./configure" tells me that I need to have installed a version of mono, but I have it installed [raven@localhost ~]$ mono -V Mono JIT compiler version 3.2.8 (tarball Fri May 30 08:15:47 CDT 2014) Copyright (C) 2002-2014 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com TLS: __thread SIGSEGV: altstack Notifications: epoll Architecture: amd64 Disabled: none Misc: softdebug LLVM: supported, not enabled. GC: sgen [raven@localhost ~]$ cd /home/raven/Downloads/monodevelop-4.2.3 [raven@localhost monodevelop-4.2.3]$ ./configure checking for a BSD-compatible install... /usr/bin/install -c checking whether build environment is sane... yes checking for a thread-safe mkdir -p... /usr/bin/mkdir -p checking for gawk... gawk checking whether make sets $(MAKE)... yes checking how to create a ustar tar archive... gnutar checking whether to enable maintainer-specific portions of Makefiles... no checking for mono... /usr/local/bin/mono checking for gmcs... /usr/local/bin/gmcs checking for pkg-config... /usr/bin/pkg-config configure: error: You need mono 3.0.4 or newer [raven@localhost monodevelop-4.2.3]$

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• IHttpAsyncHandler and IObservable web requests

  - by McLovin

  Within Async handler I'm creating an IObservable from webrequest which returns a redirect string. I'm subscribing to that observable and calling AsyncResult.CompleteCall() but I'm forced to use Thread.Sleep(100) in order to get it executed. And it doesn't work every time. I'm pretty sure this is not correct. Could you please shine some light. Thank you! public IAsyncResult BeginProcessRequest(HttpContext context, AsyncCallback cb, object state) { _context = context; _ar = new AsyncResult(cb, state); _tweet = context.Request["tweet"]; string url = context.Request["url"]; if(String.IsNullOrEmpty(_tweet) || String.IsNullOrEmpty(url)) { DisplayError("<h2>Tweet or url cannot be empty</h2>"); return _ar; } _oAuth = new oAuthTwitterRx(); using (_oAuth.AuthorizationLinkGet().Subscribe(p => { _context.Response.Redirect(p); _ar.CompleteCall(); }, exception => DisplayError("<h2>Unable to connect to twitter, please try again</h2>") )) return _ar; } public class AsyncResult : IAsyncResult { private AsyncCallback _cb; private object _state; private ManualResetEvent _event; private bool _completed = false; private object _lock = new object(); public AsyncResult(AsyncCallback cb, object state) { _cb = cb; _state = state; } public Object AsyncState { get { return _state; } } public bool CompletedSynchronously { get { return false; } } public bool IsCompleted { get { return _completed; } } public WaitHandle AsyncWaitHandle { get { lock (_lock) { if (_event == null) _event = new ManualResetEvent(IsCompleted); return _event; } } } public void CompleteCall() { lock (_lock) { _completed = true; if (_event != null) _event.Set(); } if (_cb != null) _cb(this); } }

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• Time to start returning IQueryable<T> instead of IList<T> to my Web UI / Web API Layer?

  - by JohnnyO

  I've got a multi-layer application that starts with the repository pattern for all data access and it returns IQueryable to the Services layer. The Services layer, which includes all of the business logic, returns IList to the Controllers (note: I'm using ASP.NET MVC for the UI layer). The benefit of returning IQueryable in the data access layer is that it allows my repositories to be extremely simple and the database queries to be deferred. However, I'm triggering the database queries in my services layer so that my unit tests is more reliable and I don't give flexibility to the Controllers to reshape my queries. However, I've recently encountered several situations where deferring the execution of queries down to the Controllers would have been significantly more performant because the Controllers had to do some projections on the data that was UI specific. Additionally, with the emergence of things like oData, I was starting to wonder if end points (e.g. web UI or web apis) should be working directly with IQueryable. What are your thoughts? Is it time to start returning IQueryable from the services layer to the UI layer? Or stick with IList? This thread here: http://stackoverflow.com/questions/718624/to-return-iqueryablet-or-not-return-iqueryablet seems to vouch for returning IList to the UI layers, but I was wondering if things are changing because of new emerging technologies and techniques.

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• ActivityThread exception in Android?

  - by Praveen Chandrasekaran

  My Log CAT Value: 05-17 15:16:30.572: ERROR/ActivityThread(17448): Activity com.example.brown.Bru_Maps has leaked IntentReceiver android.net.NetworkConnectivityListener$ConnectivityBroadcastReceiver@432e6360 that was originally registered here. Are you missing a call to unregisterReceiver()? 05-17 15:16:30.572: ERROR/ActivityThread(17448): android.app.IntentReceiverLeaked: Activity com.example.brown.Bru_Maps has leaked IntentReceiver android.net.NetworkConnectivityListener$ConnectivityBroadcastReceiver@432e6360 that was originally registered here. Are you missing a call to unregisterReceiver()? 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.app.ActivityThread$PackageInfo$ReceiverDispatcher.<init>(ActivityThread.java:748) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.app.ActivityThread$PackageInfo.getReceiverDispatcher(ActivityThread.java:576) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.app.ApplicationContext.registerReceiverInternal(ApplicationContext.java:770) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.app.ApplicationContext.registerReceiver(ApplicationContext.java:757) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.app.ApplicationContext.registerReceiver(ApplicationContext.java:751) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.content.ContextWrapper.registerReceiver(ContextWrapper.java:290) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.net.NetworkConnectivityListener.startListening(NetworkConnectivityListener.java:138) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at com.google.android.maps.MapActivity.onResume(MapActivity.java:232) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.app.Instrumentation.callActivityOnResume(Instrumentation.java:1225) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.app.Activity.performResume(Activity.java:3559) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2838) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2866) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1819) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.os.Handler.dispatchMessage(Handler.java:99) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.os.Looper.loop(Looper.java:123) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at android.app.ActivityThread.main(ActivityThread.java:4203) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at java.lang.reflect.Method.invokeNative(Native Method) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at java.lang.reflect.Method.invoke(Method.java:521) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:549) 05-17 15:16:30.572: ERROR/ActivityThread(17448): at dalvik.system.NativeStart.main(Native Method) What is the Activity Thread Exception in Android? Please Help.

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• Getting Vars to bind properly across multiple files

  - by Alex Baranosky

  I am just learning Clojure and am having trouble moving my code into different files. I keep detting this error from the appnrunner.clj - Exception in thread "main" java.lang.Exception: Unable to resolve symbol: -run-application in this context It seems to be finding the namespaces fine, but then not seeing the Vars as being bound... Any idea how to fix this? Here's my code: APPLICATION RUNNER - (ns src/apprunner (:use src/functions)) (def input-files [(resource-path "a.txt") (resource-path "b.txt") (resource-path "c.txt")]) (def output-file (resource-path "output.txt")) (defn run-application [] (sort-files input-files output-file)) (-run-application) APPLICATION FUNCTIONS - (ns src/functions (:use clojure.contrib.duck-streams)) (defn flatten [x] (let [s? #(instance? clojure.lang.Sequential %)] (filter (complement s?) (tree-seq s? seq x)))) (defn resource-path [file] (str "C:/Users/Alex and Paula/Documents/SoftwareProjects/MyClojureApp/resources/" file)) (defn split2 [str delim] (seq (.split str delim))) (defstruct person :first-name :last-name) (defn read-file-content [file] (apply str (interpose "\n" (read-lines file)))) (defn person-from-line [line] (let [sections (split2 line " ")] (struct person (first sections) (second sections)))) (defn formatted-for-display [person] (str (:first-name person) (.toUpperCase " ") (:last-name person))) (defn sort-by-keys [struct-map keys] (sort-by #(vec (map % [keys])) struct-map)) (defn formatted-output [persons output-number] (let [heading (str "Output #" output-number "\n") sorted-persons-for-output (apply str (interpose "\n" (map formatted-for-display (sort-by-keys persons (:first-name :last-name)))))] (str heading sorted-persons-for-output))) (defn read-persons-from [file] (let [lines (read-lines file)] (map person-from-line lines))) (defn write-persons-to [file persons] (dotimes [i 3] (append-spit file (formatted-output persons (+ 1 i))))) (defn sort-files [input-files output-file] (let [persons (flatten (map read-persons-from input-files))] (write-persons-to output-file persons)))

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• Twitter4J throws exception in TwitterFactory

  - by Philipp Andre

  Hello Guys, i'm trying to access twitter via oauth. Therefore, i registered my app, downloaded Twitter4j, added the jars in my Eclipse-Project, and then tried to execute the following code: Twitter twitter = new TwitterFactory().getOAuthAuthorizedInstance("[key]","[secretKey]); RequestToken requestToken = twitter.getOAuthRequestToken(); System.out.println(requestToken.getAuthorizationURL()); But it raises the following exception: [Sat May 29 11:19:11 CEST 2010]Using class twitter4j.internal.logging.StdOutLoggerFactory as logging factory. [Sat May 29 11:19:11 CEST 2010]Use twitter4j.internal.http.alternative.HttpClientImpl as HttpClient implementation. Exception in thread "main" java.lang.AssertionError: java.lang.reflect.InvocationTargetException at twitter4j.internal.http.HttpClientFactory.getInstance(HttpClientFactory.java:71) at twitter4j.internal.http.HttpClientWrapper.<init>(HttpClientWrapper.java:59) at twitter4j.http.OAuthAuthorization.init(OAuthAuthorization.java:83) at twitter4j.http.OAuthAuthorization.<init>(OAuthAuthorization.java:74) at twitter4j.TwitterFactory.getOAuthAuthorizedInstance(TwitterFactory.java:112) at MainProgram.main(MainProgram.java:18) Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source) at java.lang.reflect.Constructor.newInstance(Unknown Source) at twitter4j.internal.http.HttpClientFactory.getInstance(HttpClientFactory.java:65) ... 5 more Caused by: java.lang.NoClassDefFoundError: org/apache/http/impl/client/DefaultHttpClient at twitter4j.internal.http.alternative.HttpClientImpl.<init>(HttpClientImpl.java:63) ... 10 more I currently can't figure out why ... can you please give me some suggestions? Best regards Philipp

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• android checkbox box issue

  - by raqz

  i have this check box in a alertdialog. when i try to check the state of the checkbox, the application force closes. any idea why? LayoutInflater factory = LayoutInflater.from(NewActivity.this); final View textDisplayView = factory.inflate(R.layout.nearestlocs, null); final AlertDialog.Builder newAlert = new AlertDialog.Builder(NewActivity.this); newAlert.setView(textDisplayView); final CheckBox checkBoxLab = (CheckBox) findViewById(R.id.checkboxlab); newAlert.setPositiveButton("Display on Map", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int whichButton) { if(checkBoxLab.isChecked()){ libDisplayFlag = true; } error log 03-13 08:01:58.273: ERROR/AndroidRuntime(6188): Uncaught handler: thread main exiting due to uncaught exception 03-13 08:01:58.292: ERROR/AndroidRuntime(6188): java.lang.NullPointerException 03-13 08:01:58.292: ERROR/AndroidRuntime(6188): at com.isproj3.NewActivity$3.onClick(NewActivity.java:158) 03-13 08:01:58.292: ERROR/AndroidRuntime(6188): at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:158) 03-13 08:01:58.292: ERROR/AndroidRuntime(6188): at android.os.Handler.dispatchMessage(Handler.java:99) xml <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent"> <LinearLayout android:orientation="horizontal" android:gravity="center" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_weight="1"> <CheckBox android:id="@+id/checkboxlib" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="Library" android:gravity="left" android:textColor="#FF0000" android:paddingBottom="5px" android:textSize="07pt" android:checked="true" /> <TextView android:id="@+id/librarytext" android:layout_width="wrap_content" android:layout_height="wrap_content" android:gravity="center" android:paddingBottom="5px" android:textSize="8pt" /> </LinearLayout> </LinearLayout>

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• Flash video slooow in AIR 2 HTMLLoader component

  - by shane

  I am working on a full screen kiosk application in Flex 4/Air 2 using Flash Builder 4. We have a company training website which staff can access via the kiosk, and the main content is interactive flash training videos. Our target machines are by no means 'beefy', they are Atom n270s @ 1.6Ghz with 1Gb RAM. As it stands the videos are all but unusable when used from within the Air application, the application becomes completely unresponsive (100% cpu usage, click events take approx 5-10 seconds to register). So far I have tried: increasing the default frame rate from 24fps to 60. No improvement. nativeWindow.stage.frameRate = 60; running the videos in a stripped down version of my app, just a full screen HTMLLoader component pointed at the training website. No better than before. disabled hyper threading. The Atom CPU is split into two virtual cores, and the AIR app was only able to use one thread so maxed out at 50% CPU usage. Since the kiosk will only run the AIR app I am happy to loose hyper threading to increase the performance of the Air app. Marginal Improvement. The same website with the same videos is responsive if viewed in ie7 on the same machine, although Internet Explorer takes advantage of the CPU’s hyper threading. The flash videos are built with Adobe Captivate and from what I understand employee JavaScript to relay results back to the server. I will add more information about the video content asap as the training guru is back in the office later this week.

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• EF 4.0 : Save Changes Retry Logic

  - by BGR

  Hi, I would like to implement an application wide retry system for all entity SaveChanges method calls. Technologies: Entity framework 4.0 .Net 4.0 namespace Sample.Data.Store.Entities { public partial class StoreDB { public override int SaveChanges(System.Data.Objects.SaveOptions options) { for (Int32 attempt = 1; ; ) { try { return base.SaveChanges(options); } catch (SqlException sqlException) { // Increment Trys attempt++; // Find Maximum Trys Int32 maxRetryCount = 5; // Throw Error if we have reach the maximum number of retries if (attempt == maxRetryCount) throw; // Determine if we should retry or abort. if (!RetryLitmus(sqlException)) throw; else Thread.Sleep(ConnectionRetryWaitSeconds(attempt)); } } } static Int32 ConnectionRetryWaitSeconds(Int32 attempt) { Int32 connectionRetryWaitSeconds = 2000; // Backoff Throttling connectionRetryWaitSeconds = connectionRetryWaitSeconds * (Int32)Math.Pow(2, attempt); return (connectionRetryWaitSeconds); } /// <summary> /// Determine from the exception if the execution /// of the connection should Be attempted again /// </summary> /// <param name="exception">Generic Exception</param> /// <returns>True if a a retry is needed, false if not</returns> static Boolean RetryLitmus(SqlException sqlException) { switch (sqlException.Number) { // The service has encountered an error // processing your request. Please try again. // Error code %d. case 40197: // The service is currently busy. Retry // the request after 10 seconds. Code: %d. case 40501: //A transport-level error has occurred when // receiving results from the server. (provider: // TCP Provider, error: 0 - An established connection // was aborted by the software in your host machine.) case 10053: return (true); } return (false); } } } The problem: How can I run the StoreDB.SaveChanges to retry on a new DB context after an error occured? Something simular to Detach/Attach might come in handy. Thanks in advance! Bart

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• XMLRPC java insert issue

  - by Sanjai Palliyil

  I am trying to insert customer details into OpenERP server using XMLPRC and java. I am able to do an authentication. But when i call the execute method to insert the record by passing the parameters, am getting Exception in thread "main" java.lang.NullPointerException on line res_create = client_1.execute("execute", params_create); Please find my code below res = client.execute("login", params); String url_1 = "http://agilewebdevelopment.net:8514/xmlrpc/object"; XmlRpcClientConfigImpl config_1 = new XmlRpcClientConfigImpl(); try { config_1.setServerURL(new URL(url_1)); } catch (MalformedURLException e) { System.out.println("First"); e.printStackTrace(); } System.out.println(res); HashMap<String, Object> vals = new HashMap<String, Object>(); vals.put("name", "Mantavya Gajjar"); vals.put("ref", "MGA"); XmlRpcClient client_1 = new XmlRpcClient(); client.setConfig(config_1); Object[] params_create = new Object[]{"erp_performance", "1", "admin", "res.partner", "create", vals}; Object res_create = null; try { res_create = client_1.execute("execute", params_create); } catch (XmlRpcException e) { e.printStackTrace(); } Any helps is appreciated

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• NAudio playback wont stop successfully

  - by Kurru

  Hi When using NAudio to playback an mp3 [in the console], I cant figure out how to stop the playback. When I call waveout.Stop() the code just stops running and waveout.Dispose() never gets called. Is it something to do with the function callback? I dont know how to fix that if it is. static string MP3 = @"song.mp3"; static WaveOut waveout; static WaveStream playback; static void Main(string[] args) { waveout = new WaveOut(WaveCallbackInfo.FunctionCallback()); playback = OpenMp3Stream(MP3); waveout.Init(playback); waveout.Play(); Console.WriteLine("Started"); Thread.Sleep(2 * 1000); Console.WriteLine("Ending"); if (waveout.PlaybackState != PlaybackState.Stopped) waveout.Stop(); Console.WriteLine("Stopped"); waveout.Dispose(); Console.WriteLine("1st dispose"); playback.Dispose(); Console.WriteLine("2nd dispose"); } private static WaveChannel32 OpenMp3Stream(string fileName) { WaveChannel32 inputStream; WaveStream mp3Reader = new Mp3FileReader(fileName); WaveStream pcmStream = WaveFormatConversionStream.CreatePcmStream(mp3Reader); WaveStream blockAlignedStream = new BlockAlignReductionStream(pcmStream); inputStream = new WaveChannel32(blockAlignedStream); return inputStream; }

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• when long polling, Why are my other requests taking so long?

  - by Pascal

  The client makes 2 concurrent requests. (1 which takes 60 seconds - long polling) and another which is NOT long polling - supposed to return right away. It does return right away when I'm not doing long polling. But as soon as I start doing long polling with the other thread, the other one takes forever to execute. Firebug shows that the request is waiting for 10-50 seconds. On the server, I profiled ALL requests from the moment the php script starts to the time it goes back to the client, and it shows that each one only took 300ms or less. This problem started about the same time I started doing long polling (with the other XHR requests). I'm using jquery for both requests. The server shows that it is under very light load. CPU and memory less then 2%. 8 processes running out of a pool of 15. (it doesn't seem to deviate much from that number 8, even when I run more ajax requests). I guess each process can run multiple ajax threads concurrently. I made sure to EXIT from all processes as soon as their done executing. I don't see how the process pool has run out, if there are still 7 unused processes listed under prstat -J. Also, the problem happens somewhat intermittently. Firefox should be able to handle 2 concurrent ajax requests. i dont get what the problem is.

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• SQL Compact allow only one WCF Client

  - by Andreas Hoffmann

  Hi, I write a little Chat Application. To save some infos like Username and Password I store the Data in an SQL-Compact 3.5 SP1 Database. Everything working fine, but If another (the same .exe on the same machine) Client want to access the Service. It came an EndpointNotFound exception, from the ServiceReference.Class.Open() at the Second Client. So i remove the CE Data Access Code and I get no Error (with an if (false)) Where is the Problem? I googled for this, but no one seems the same error I get :( SOLUTION I used the wrapper in http://csharponphone.blogspot.com/2007/01/keeping-sqlceconnection-open-and-thread.html for threat safty, and now it works :) Client Code: public test() { var newCompositeType = new Client.ServiceReference1.CompositeType(); newCompositeType.StringValue = "Hallo" + DateTime.Now.ToLongTimeString(); newCompositeType.Save = (Console.ReadKey().Key == ConsoleKey.J); ServiceReference1.Service1Client sc = new Client.ServiceReference1.Service1Client(); sc.Open(); Console.WriteLine("Save " + newCompositeType.StringValue); sc.GetDataUsingDataContract(newCompositeType); sc.Close(); } Server Code public CompositeType GetDataUsingDataContract(CompositeType composite) { if (composite.Save) { SqlCeConnection con = new SqlCeConnection(Properties.Settings.Default.Con); con.Open(); var com = con.CreateCommand(); com.CommandText = "SELECT * FROM TEST"; SqlCeResultSet result = com.ExecuteResultSet(ResultSetOptions.Scrollable | ResultSetOptions.Updatable); var rec = result.CreateRecord(); rec["TextField"] = composite.StringValue; result.Insert(rec); result.Close(); result.Dispose(); com.Dispose(); con.Close(); con.Dispose(); } return composite; }

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• MessageSecurityException: The security header element 'Timestamp' with the '' id must be signed

  - by NiklasN

  I'm asking the same question here that I've already asked on msdn forums http://social.msdn.microsoft.com/Forums/en-US/netfxnetcom/thread/70f40a4c-8399-4629-9bfc-146524334daf I'm consuming a (most likely Java based) Web Service with I have absolutely no access to modify. It won't be modified even though I would ask them (it's a nation wide system). I've written the client with WCF. Here's some code: CustomBinding binding = new CustomBinding(); AsymmetricSecurityBindingElement element = SecurityBindingElement.CreateMutualCertificateDuplexBindingElement(MessageSecurityVersion.WSSecurity10WSTrustFebruary2005WSSecureConversationFebruary2005WSSecurityPolicy11BasicSecurityProfile10); element.AllowSerializedSigningTokenOnReply = true; element.SetKeyDerivation(false); element.IncludeTimestamp = true; element.KeyEntropyMode = SecurityKeyEntropyMode.ClientEntropy; element.MessageProtectionOrder = System.ServiceModel.Security.MessageProtectionOrder.SignBeforeEncrypt; element.LocalClientSettings.IdentityVerifier = new CustomIdentityVerifier(); element.SecurityHeaderLayout = SecurityHeaderLayout.Lax; element.IncludeTimestamp = false; binding.Elements.Add(element); binding.Elements.Add(new TextMessageEncodingBindingElement(MessageVersion.Soap11, Encoding.UTF8)); binding.Elements.Add(new HttpsTransportBindingElement()); EndpointAddress address = new EndpointAddress(new Uri("url")); ChannelFactory<MyPortTypeChannel> factory = new ChannelFactory<MyPortTypeChannel>(binding, address); ClientCredentials credentials = factory.Endpoint.Behaviors.Find<ClientCredentials>(); credentials.ClientCertificate.Certificate = myClientCert; credentials.ServiceCertificate.DefaultCertificate = myServiceCert; credentials.ServiceCertificate.Authentication.CertificateValidationMode = X509CertificateValidationMode.None; service = factory.CreateChannel(); After this every request done to the service fails in client side (I can confirm my request is accepted by the service and a sane response is being returned) I always get the following exception MessageSecurityException: The security header element 'Timestamp' with the '' id must be signed. By looking at trace I can see that in the response there really is a timestamp element, but in the security section there is only a signature for body. Can I somehow make WCF to ingore the fact Timestamp isn't signed?

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• Error trying to set svn password on Hudson.

  - by Daniel Moura

  After filling the Repository URL, User name and password I get the following error. Does anyone knows how to fix it? No authentication was attemped. FAILED: svn: Operation cancelled org.tmatesoft.svn.core.SVNCancelException: svn: Operation cancelled at hudson.scm.SubversionSCM$DescriptorImpl.postCredential(SubversionSCM.java:1421) at hudson.scm.SubversionSCM$DescriptorImpl.doPostCredential(SubversionSCM.java:1317) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:160) at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:76) at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:73) at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30) at org.kohsuke.stapler.Stapler.invoke(Stapler.java:436) at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:186) at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30) at org.kohsuke.stapler.Stapler.invoke(Stapler.java:436) at org.kohsuke.stapler.Stapler.invoke(Stapler.java:354) at org.kohsuke.stapler.Stapler.service(Stapler.java:114) at javax.servlet.http.HttpServlet.service(HttpServlet.java:45) at winstone.ServletConfiguration.execute(ServletConfiguration.java:249) at winstone.RequestDispatcher.forward(RequestDispatcher.java:335) at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:378) at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:91) at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:83) at winstone.FilterConfiguration.execute(FilterConfiguration.java:195) at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:368) at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84) at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76) at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:155) at winstone.FilterConfiguration.execute(FilterConfiguration.java:195) at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:368) at winstone.RequestDispatcher.forward(RequestDispatcher.java:333) at winstone.RequestHandlerThread.processRequest(RequestHandlerThread.java:244) at winstone.RequestHandlerThread.run(RequestHandlerThread.java:150) at java.lang.Thread.run(Unknown Source)

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• Project Euler: Programmatic Optimization for Problem 7?

  - by bmucklow

  So I would call myself a fairly novice programmer as I focused mostly on hardware in my schooling and not a lot of Computer Science courses. So I solved Problem 7 of Project Euler: By listing the first six prime numbers: 2, 3, 5, 7, 11, and 13, we can see that the 6th prime is 13. What is the 10001st prime number? I managed to solve this without problem in Java, but when I ran my solution it took 8 and change seconds to run. I was wondering how this could be optimized from a programming standpoint, not a mathematical standpoint. Is the array looping and while statements the main things eating up processing time? And how could this be optimized? Again not looking for a fancy mathematical equation..there are plenty of those in the solution thread. SPOILER My solution is listed below. public class PrimeNumberList { private ArrayList<BigInteger> primesList = new ArrayList<BigInteger>(); public void fillList(int numberOfPrimes) { primesList.add(new BigInteger("2")); primesList.add(new BigInteger("3")); while (primesList.size() < numberOfPrimes){ getNextPrime(); } } private void getNextPrime() { BigInteger lastPrime = primesList.get(primesList.size()-1); BigInteger currentTestNumber = lastPrime; BigInteger modulusResult; boolean prime = false; while(!prime){ prime = true; currentTestNumber = currentTestNumber.add(new BigInteger("2")); for (BigInteger bi : primesList){ modulusResult = currentTestNumber.mod(bi); if (modulusResult.equals(BigInteger.ZERO)){ prime = false; break; } } if(prime){ primesList.add(currentTestNumber); } } } public BigInteger get(int primeTerm) { return primesList.get(primeTerm - 1); } }

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