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  • Am I correct in my assumption about synchronized block?

    - by kunjaan
    I have a method shout() with a synchronized block. private void shout(){ System.out.println("SHOUT " + Thread.currentThread().getName()); synchronized(this){ System.out.println("Synchronized Shout" + Thread.currentThread().getName()); try { Thread.sleep(50); } catch (InterruptedException e) { e.printStackTrace(); } System.out.println("Synchronized Shout" + Thread.currentThread().getName()); } } If I have two Threads that run this method, am I correct in assuming that the two "Synchronized Shout" will always appear one after the other? There can be no other statements in between the "Synchronized Shout"?

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  • Java - binary compatibility of abstract class & subclasses

    - by thSoft
    In Java, I define an abstract class with both concrete and abstract methods in it, and it has to be subclassed independently by third-party developers. Just to be sure: are there any changes I could make to the abstract class that are source compatible with their classes but not binary compatible? In other words: after they have compiled their subclasses, could I change the abstract class - apart from e.g. adding an abstract method to it or removing a protected method from it that is called by subclasses, which are of course source incompatible - in a way that could force them to recompile their subclasses?

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  • MS-Access VBA: form_error vs on error

    - by dmr
    I am trying to set up error handling for a MS-Access application. The standard method to do this seems to be with an On Error statement in each subroutine/function. It seems simpler to me to use the Form_Error function to catch all the runtime errors in that form as opposed to an On Error statement for each sub/function called by an event on that form. (Obviously, for code in modules, there is no Form_Error function and therefore the only method is the On Error statement) What are the pros and cons of using On Error vs Form_Error?

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  • Spring webflow 1.0 - Downloading a file

    - by Dave
    I am using spring webflow 1.0. I am uploading a csv file, parsing it, and displying results before proceeding. The user has an option to download a csv file that contains the records that did not pass validation. When I click the link in a JSP to download this file, webflow invokes a form Action. The form action writes out a file via getting the output stream off the response: HttpServletResponse response = ((ServletExternalContext) context.getExternalContext()).getResponse(); I do not want to leave the jsp I'm currently on. I just want to download the file. In other words, I do not want to transition to another state. I just want to serve the dynamically rendered file. Everything works (I don't leave the page, and I download the file), but I'm getting the following error in my console: _pEncydKfggPHJo8=org.springframework.webflow.engine.NoMatchingTransitionException: No transition was matched on the event(s) signaled by the [1] action(s) that executed in this action state 'downloadErrorReportAction' of flow 'myFlow'; transitions must be defined to handle action result outcomes -- possible flow configuration error? Note: the eventIds signaled were: 'array<String>[[null]]', while the supported set of transitional criteria for this action state is 'array<TransitionCriteria>[[empty]]' at org.springframework.webflow.engine.ActionState.doEnter(ActionState.java:187) at org.springframework.webflow.engine.State.enter(State.java:191) at org.springframework.webflow.engine.Transition.execute(Transition.java:212) at org.springframework.webflow.engine.TransitionableState.onEvent(TransitionableState.java:107) at org.springframework.webflow.engine.Flow.onEvent(Flow.java:534) Truncated. see log file for complete stacktrace Here is the relevant portion of my webflow config. <view-state id="showUploadResults" view="UploadResults3.0"> <render-actions> <action bean="UploadResultsAction" method="transitionToWebflow"/> <action bean="UploadResultsAction" method="setupData"/> </render-actions> <transition on="submit" to="proceed"/> <transition on="downloadErrorReport" to="downloadErrorReportAction"/> </view-state> <action-state id="downloadErrorReportAction"> <action bean="UploadResultsAction" method="downloadErrorReport" name="downloadErrorReport"/> </action-state>

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  • SmtpClient.SendAsync(); Not working on my new (64bit) computer.

    - by j-t-s
    Hi All, Okay, Only a couple weeks ago I had an old 32bit computer, but had to buy a new computer, which happens to be 64bit. I've rewritten the method that sends e-mails asynchonously and it just does not work. And does NOT throw any exceptions either. What gives? I have also tried the Async method code found iin MSDN, and the BlackWasp tutorial code, and MANY others. They're all the same! The only difference here seems to be the fact that I'm now on a 64bit computer. How can I get around this? Google/MSDN has been of zero help. Thanks

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  • Adding operation in middle of complex sequence diagram in visio 2003

    - by James
    I am using Microsoft Visio 2003 to define static classes with operations/methods and a sequence diagrams referring to these classes. The sequence diagram is almost done, but i realized that i missed one operation in middle of the diagram. When i try to move rest of the sequences down by selecting it as a block, all the operations in the block loose link with static diagrams. ( Methods which were referred to static classes as fun(), became fun, which means that now they no longer refer to static diagrams and any future changes would not be reflected in dynamic sequence diagrams automatically.) The sequence diagrams have grown to A3 size paper and i have many of such diagrams which needs correction. Manually moving the operations one by one would involve lots of effort. Could someone kindly suggest a way to overcome this problem?

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  • It it possible to have multiple ReWrite rules that all do the same Action, for an IIS7.5 webserver?

    - by Pure.Krome
    I've got rewrite module working great for my IIS7.5 site. Now, I wish to add a number of urls that all goto an HTTP 410-Gone status. Eg. <rule name="Old Site = image1" patternSyntax="ExactMatch" stopProcessing="true"> <match url="image/loading_large.gif"/> <match url="image/aaa.gif"/> <match url="image/bbb.gif"/> <match url="image/ccc.gif"/> <action type="CustomResponse" statusCode="410" statusReason="Gone" statusDescription="The requested resource is no longer available" /> </rule> but that's invalid - the website doesn't start saying there's a rewrite config error. Is there another way I can do this? I don't particularly want define a single URL and ACTION for each url.

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  • Listview with alternating resources in Android

    - by Fran
    Hi! I have a ListView and an adapter that sets alternating background colors to the list items overwriting getView Method in my adapter. I want to go further and I would to set to each row a Resource background. I try in getView call the method setBackgroundResource: private int[] messages = new int[] {R.layout.message,R.layout.message2}; //... public View getView(int position, View convertView, ViewGroup parent) { View v = super.getView(position, convertView, parent); int MessagePos = position % messages.length; v.setBackgroundResource(messages[MessagePos]); return v;} But this not work, and I the message throws by exception is File res/layout/message.xml from drawable resource ID #0x7f030004 Any ideas? Thanks!

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  • Return a dynamic string from std::exception's `what`

    - by Shtééf
    I'm convinced at this point that I should be creating subclasses of std::exception for all my exception throwing needs. Now I'm looking at how to override the what method. The situation that I'm facing, it would be really handy if the string what returns be dynamic. Some pieces of code parse an XML file for example, and adding a position or line number to the error message is useful to me. What I'd like to know: what returns a const char *, which implies any catcher is likely not going to free the string. So I need some other place to store the result, but where would that be? (I need thread-safety.) what also includes throw() in its signature. While I can prevent my what from throwing anything, it seems to me that this method really isn't intended for anything too dynamic. If what is not the right place, then where should I be doing this instead?

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  • ASP.NET MVC AJAX value not displaying

    - by mazhar kaunain baig
    View: function success(arg) { var obj = arg.get_response().get_object(); if (obj.ErrorMessage === '') { var answer = document.createElement('div'); answer.appendChild(document.createTextNode(obj.Answer)); document.getElementById('answers').appendChild(answer); } else { document.getElementById('errors').innerHTML = obj.ErrorMessage; } } <% using (Ajax.BeginForm("EditOrganizationMeta", "Organization", new AjaxOptions { HttpMethod = "POST", OnSuccess = "success" })) { %> <input type="submit" name="button<%=OrganizationMeta.vcr_MetaKey + Lang.int_LangId %>" value="Save" /> <div id="errors"></div> <div id="answers"></div> <% } %> Controller: [HttpPost] [ValidateInput(false)] public ActionResult EditOrganizationMeta(FormCollection collection) { return Json(new { Answer = "Record Successfully Saved", ErrorMessages = "Title is required" }); } The thing is that success method in the javascript is not getting the required parameters. It is printing undefined there. Is there a problem in javascript method OnSuccess?

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  • Can I use the whatthetrend.com API to get daily and weekly twitter trends?

    - by Charles S.
    The twitter API allows me to receive daily trends and weekly trends (in addition to current trends, of course) as either JSON or XML. Is there an equivalent with the whatthetrend.com API? I don't see a method/parameter at first glance but I wanted to see if anyone out there knew a way... http://api.whatthetrend.com/api There's a method to lookup trend definition by keyword so I guess I could use that based off the Twitter API but I'd rather just load all the data at once rather than have to remotely access the API every time I want to look up a definition. Thanks

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  • How to effectively copy an array in java ?

    - by Tony
    The toArray method in ArrayList , Bloch uses both System.arraycopy and Arrays.copyOf to copy an array . public <T> T[] toArray(T[] a) { if (a.length < size) // Make a new array of a's runtime type, but my contents: return (T[]) Arrays.copyOf(elementData, size, a.getClass()); System.arraycopy(elementData, 0, a, 0, size); if (a.length > size) a[size] = null; return a; } How to compare these two copy method , when to use which ? Thanks.

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  • Mysql-proxy compile in CentOS

    - by gtfx
    Hey, While trying to compile Mysql-Poxy i get the following error. By the instructions here Libtool library used but `LIBTOOL' is undefined The usual way to define `LIBTOOL' is to add `AC_PROG_LIBTOOL' to `configure.in' and run `aclocal' and `autoconf' again. If `AC_PROG_LIBTOOL' is in `configure.in', make sure its definition is in aclocal's search path Libtool installed from source. Running aclocal get's no error. running ./configure ./configure: line 5821: AC_DISABLE_STATIC: command not found ./configure: line 5823: AC_PROG_LIBTOOL: command not found checking shared library path variable... configure: error: eval "libtool --config | grep ^shlibpath_var" failed Running libtool command libtool --config | grep ^shlibpath_var shlibpath_var=LD_LIBRARY_PATH What am i missing? Thank you for your time.

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  • Launch elasticsearch dockerfile using my own elasticsearch.yml

    - by Kevin
    I am launching elasticsearch via a dockerfile found here: https://index.docker.io/u/ehazlett/elasticsearch/ It works great. I need to define my own hosts as my environment does not support multicast of any kind. I understand that my options are: 1) supply hosts when elasticsearch is run as a command line parameter 2) modify my elasticsearch.yml file to set the hosts. I know how to build the yml, what I need to know is how to launch elasticsearch via docker using my own yml instead of the one in the container. Is that possible? Thanks.

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  • Sorting By Multiple Conditions in Ruby

    - by viatropos
    I have a collection of Post objects and I want to be able to sort them based on these conditions: First, by category (news, events, labs, portfolio, etc.) Then by date, if date, or by position, if a specific index was set for it Some posts will have dates (news and events), others will have explicit positions (labs, and portfolio). I want to be able to call posts.sort!, so I've overridden <=>, but am looking for the most effective way of sorting by these conditions. Below is a pseudo method: def <=>(other) # first, everything is sorted into # smaller chunks by category self.category <=> other.category # then, per category, by date or position if self.date and other.date self.date <=> other.date else self.position <=> other.position end end It seems like I'd have to actually sort two separate times, rather than cramming everything into that one method. Something like sort_by_category, then sort!. What is the most ruby way to do this?

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  • WPF: How to get Binding.Converter

    - by Nike
    I create DataGrid Columns with Binding (where i is a Int value): dataGrid.Columns.Add(new DataGridTextColumn { Header = i.ToString(), Binding = CreateBinding(i), }); private Binding CreateBinding(int num) { Binding bind = new Binding(string.Format("[{0}]", num)); bind.Converter = new CellValueConverter(); return bind; } In the CreateBinding method I have an access to bind.Converter property. I need to call Converter.Convert() method in some handler, but there is no Converter property when I try to access it: (dataGrid.Columns[clm] as DataGridTextColumn).Binding."no Converter property!" How can I get my CellValueConverter which was created for particular Column?

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  • Why is javac failing on @Override annotation

    - by skiphoppy
    Eclipse is adding @Override annotations when I implement methods of an interface. Eclipse seems to have no problem with this. And our automated build process from Cruise Control seems to have no problem with this. But when I build from the command-line, with ant running javac, I get this error: [javac] C:\path\project\src\com\us\MyClass.java:70: method does not override a method from its superclass [javac] @Override [javac] ^ [javac] 1 error Eclipse is running under Java 1.6. Cruise Control is running Java 1.5. My ant build fails regardless of which version of Java I use.

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  • python, wrapping class returning the average of the wrapped members

    - by João Portela
    The title isn't very clear but I'll try to explain. Having this class: class Wrapped(object): def method_a(self): # do some operations return n def method_b(self): # also do some operations return n I wan't to have a class that performs the same way as this one: class Wrapper(object): def __init__(self): self.ws = [Wrapped(1),Wrapped(2),Wrapped(3)] def method_a(self): results=[Wrapped.method_a(w) for w in self.ws] sum_ = sum(results,0.0) average = sum_/len(self.ws) return average def method_b(self): results=[Wrapped.method_b(w) for w in self.ws] sum_ = sum(results,0.0) average = sum_/len(self.ws) return average obviously this is not the actual problem at hand (it is not only two methods), and this code is also incomplete (only included the minimum to explain the problem). So, what i am looking for is a way to obtain this behavior. Meaning, whichever method is called in the wrapper class, call that method for all the Wrapped class objects and return the average of their results. Can it be done? how? Thanks in advance. ps-didn't know which tags to include...

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  • Google App Engine 1.3.1 <admin-console> Issue

    - by Taylor L
    I attempted to add an <admin-console> section to my appengine-web.xml and I got the exception below. The <admin-console> element is a valid element according to the appengine-web.xsd. It's also documented in the app engine docs. Any ideas as to what is wrong? <admin-console> <page name="My Admin" url="/app/admin" /> </admin-console> Feb 14, 2010 12:40:09 AM com.google.apphosting.utils.config.AppEngineWebXmlReader readAppEngineWebXml SEVERE: Received exception processing C:/development/taylor/myapp/target/myapp-web-0.0.1-SNAPSHOT\WEB-INF/appengine-web.xml com.google.apphosting.utils.config.AppEngineConfigException: Unrecognized element <admin-console> at com.google.apphosting.utils.config.AppEngineWebXmlProcessor.processSecondLevelNode(AppEngineWebXmlProcessor.java:99) at com.google.apphosting.utils.config.AppEngineWebXmlProcessor.processXml(AppEngineWebXmlProcessor.java:46) at com.google.apphosting.utils.config.AppEngineWebXmlReader.processXml(AppEngineWebXmlReader.java:94) at com.google.apphosting.utils.config.AppEngineWebXmlReader.readAppEngineWebXml(AppEngineWebXmlReader.java:61) at com.google.appengine.tools.admin.Application.<init>(Application.java:88) at com.google.appengine.tools.admin.Application.readApplication(Application.java:120) at com.google.appengine.tools.admin.AppCfg.<init>(AppCfg.java:107) at com.google.appengine.tools.admin.AppCfg.<init>(AppCfg.java:58) at com.google.appengine.tools.admin.AppCfg.main(AppCfg.java:54) at net.kindleit.gae.EngineGoalBase.runAppCfg(EngineGoalBase.java:140) at net.kindleit.gae.DeployGoal.execute(DeployGoal.java:38) at org.apache.maven.plugin.DefaultPluginManager.executeMojo(DefaultPluginManager.java:579) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeGoalAndHandleFailures(DefaultLifecycleExecutor.java:498) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegmentForProject(DefaultLifecycleExecutor.java:265) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.executeTaskSegments(DefaultLifecycleExecutor.java:191) at org.apache.maven.lifecycle.DefaultLifecycleExecutor.execute(DefaultLifecycleExecutor.java:149) at org.apache.maven.DefaultMaven.execute_aroundBody0(DefaultMaven.java:223) at org.apache.maven.DefaultMaven.execute_aroundBody1$advice(DefaultMaven.java:304) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:1) at org.apache.maven.embedder.MavenEmbedder.execute_aroundBody2(MavenEmbedder.java:904) at org.apache.maven.embedder.MavenEmbedder.execute_aroundBody3$advice(MavenEmbedder.java:304) at org.apache.maven.embedder.MavenEmbedder.execute(MavenEmbedder.java:1) at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:176) at org.apache.maven.cli.MavenCli.main(MavenCli.java:63) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289) at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:408) at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:351) at org.codehaus.classworlds.Launcher.main(Launcher.java:31)

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  • Socket in C: recv overwrite a char[]

    - by Possa
    Hi all, I'm trying to make a little client-server script like many others that I've done in the past. But in this one I have a problem. It is better if I post the code and the output it give me. Code: #include <mysql.h> //not important now #include <stdlib.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h> #include <netdb.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <signal.h> #include <string.h> //constant definition #define SERVER_PORT 2121 #define LINESIZE 21 //global var definition char victim_ip[LINESIZE], file_write[LINESIZE], hacker_ip[LINESIZE]; //function void leggi (int); //not use now for debugging purpose //void scriviDB (); //not important now main () { int sock, client_len, fd; struct sockaddr_in server, client; // transport end point if((sock = socket(AF_INET, SOCK_STREAM, 0)) == -1) { perror("system call socket fail"); exit(1); } server.sin_family = AF_INET; server.sin_addr.s_addr = inet_addr("10.10.10.1"); server.sin_port = htons(SERVER_PORT); // binding address at transport end point if (bind(sock, (struct sockaddr *)&server, sizeof server) == -1) { perror("system call bind fail"); exit(1); } //fprintf(stderr, "Server open: listening.\n"); listen(sock, 5); /* managae client connection */ while (1) { client_len = sizeof(client); if ((fd = accept(sock, (struct sockaddr *)&client, &client_len)) < 0) { perror("accepting connection"); exit(1); } strcpy(hacker_ip, inet_ntoa(client.sin_addr)); printf("1 %s\n", hacker_ip); //debugging purpose //leggi(fd); ////////////////////////// //receive client recv(fd, victim_ip, LINESIZE, 0); victim_ip[sizeof(victim_ip)] = '\0'; printf("2 %s\n", hacker_ip); //debugging purpose recv(fd, file_write, LINESIZE, 0); file_write[sizeof(file_write)] = '\0'; printf("3 %s\n", hacker_ip); //debugging purpose printf("%s@%s for %s\n", file_write, victim_ip, hacker_ip); //send to client send(fd, hacker_ip, 40, 0); //now is hacker_ip for debug ///////////////////////// close(fd); }//end while exit(0); } //end main Client send string: ./send -i 10.10.10.4 -f filename.ext so the script send -i (IP) and -f (FILE) at the server. Here's my output server side: 1 10.10.10.6 2 10.10.10.6 3 [email protected] for As you can see the printf(3) and the printf(ip,file,ip) fail. I don't know how and where but someone overwrite my hacker_ip string. Thanks for your help! :)

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  • How to GetGuiResources for all system processes?

    - by Krzysztof
    Hello, I need to measure all used GDI objects in a Windows xp system. I found a GetGuiResources(__in HANDLE hProcess, __in DWORD uiFlags) method (with the GR_GDIOBJECTS flag). I call it for the process which I get from the method GetCurrentProcess() defined in WinBase.h. I don't know how to call it for other system processes, which I get by System::Diagnostics::Process::GetProcesses(), because that function returns an array of Process pointers, and GetGuiResources takes a HANDLE. Does anybody know a solution for that? How can I transform Process pointer to a Handle or get HANDLEs for all running system processes? thanks for help in advance!

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