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  • Static and overriding in Java

    - by Abhishek Jain
    public class B { static int i =1; public static int multiply(int a,int b) { return i; } public int multiply1(int a,int b) { return i; } public static void main(String args[]) { B b = new A(); System.out.println(b.multiply(5,2)); System.out.println(b.multiply1(5,2)); } } class A extends B { static int i =8; public static int multiply(int a,int b) { return 5*i; } public int multiply1(int a,int b) { return 5*i; } } Output: 1 40 Why is it so? Please explain.

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  • Why is this simple file upload not working? JSF

    - by Nitesh Panchal
    Hello, Why is this code not working? I always get size() = 0, whenever i upload file. xhtml file :- <?xml version='1.0' encoding='UTF-8' ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html"> <h:head> <title>Abc</title> </h:head> <h:body> <center> <form method="post" enctype="multipart/form-data" id="form" action="/upload/uploadFile"> <input type="file"/> <br/> <input type="Submit" value="upload"/> </form> </center> </h:body> </html> This is my servlet :- package servlets; import java.io.IOException; import java.util.List; import java.util.logging.Level; import java.util.logging.Logger; import javax.servlet.ServletException; import javax.servlet.annotation.WebServlet; import javax.servlet.http.HttpServlet; import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.apache.commons.fileupload.FileItem; import org.apache.commons.fileupload.FileUploadException; import org.apache.commons.fileupload.disk.DiskFileItemFactory; import org.apache.commons.fileupload.servlet.ServletFileUpload; @WebServlet(name="uploadFile", urlPatterns={"/uploadFile"}) public class uploadFile extends HttpServlet { protected void processRequest(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException, FileUploadException { System.out.println("executed!"); List<FileItem> items = new ServletFileUpload(new DiskFileItemFactory()).parseRequest(request); System.out.println(items.size()); for (FileItem item : items) { if (!item.isFormField()) { System.out.println("Name: " + item.getName()); System.out.println("Size: " + item.getSize()); System.out.println("Type: " + item.getContentType()); } } } @Override protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { try { processRequest(request, response); } catch (FileUploadException ex) { ex.printStackTrace(); } } @Override protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { try { processRequest(request, response); } catch (FileUploadException ex) { ex.printStackTrace(); } } @Override public String getServletInfo() { return "Short description"; } }

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  • How does real world login process happen in web application in Java?

    - by Nitesh Panchal
    Hello, I am very much confused regarding login process that happen in Java web application. I read many tutorials regarding jdbcRealm and JAAS. But, one thing that i don't understand is that why should i use them ? Can't i simply check directly against my database of users? and once they successfully login to the site, i store some variable in session as a flag. And probably check that session variable on all restricted pages (I mean keep a filter for restricted resources url pattern).If the flag doesn't exist simply redirect the user to login page. Is this approach correct?Does this approch sound correct? If yes, then why did all this JAAS and jdbcRealm came into existence? Secondly, I am trying to completely implement SAS(Software as service) in my web application, meaning everything is done through web services.If i use webservices, is it possible to use jdbcRealm? If not, then is it possible to use JAAS? If yes, then please show me some example which uses mySql as a database and then authenticates and authorizes. I even heard about Spring Security. But, i am confused about that too in the sense that how do i use webservice with Spring Security. Please help me. I am really very confused. I read sun's tutorials but they only keep talking about theories. For programmers to understand a simple concept, they show a 100 page theory first before they finally come to one example.

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  • Class Not found exception in JApplet.

    - by Nitesh Panchal
    Hello, I created a simple Applet using JApplet and everything seems to work fine but as soon i create an object of my userdefined class named ChatUser in my applet, i get this error :- SEVERE: java.lang.ClassNotFoundException: applet.ChatUser at com.sun.enterprise.loader.ASURLClassLoader.findClassData(ASURLClassLoader.java:713) at com.sun.enterprise.loader.ASURLClassLoader.findClass(ASURLClassLoader.java:626) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at java.lang.ClassLoader.loadClass(ClassLoader.java:252) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:247) at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:604) at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1575) at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1732) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) at misc.ChatClient.run(ChatClient.java:43) Any idea what can be wrong? It only happens when i create an object of any user defined class. Do i need to set some security settings or something? Please help :(

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  • Yet another bug of JSF?

    - by Nitesh Panchal
    Hello, Again i see that the @PostConstruct is firing every time even though no binding attribute is used. See this code :- <?xml version='1.0' encoding='UTF-8' ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:h="http://java.sun.com/jsf/html" xmlns:ui="http://java.sun.com/jsf/facelets" xmlns:c="http://java.sun.com/jsp/jstl/core"> <h:head> <title>Facelet Title</title> </h:head> <h:body> <h:form> <c:forEach var="item" items="#{TestBean.listItems}"> <h:outputText value="#{item}"/> </c:forEach> <h:commandButton value="Click" actionListener="#{TestBean.actionListener}"/> </h:form> </h:body> </html> And this is the simplest possible bean in JSF :- package managedBeans; import java.io.Serializable; import java.util.ArrayList; import java.util.List; import javax.annotation.PostConstruct; import javax.faces.bean.ManagedBean; import javax.faces.bean.ViewScoped; @ManagedBean(name="TestBean") @ViewScoped public class TestBean implements Serializable { private List<String> listItems; public List<String> getListItems() { return listItems; } public void setListItems(List<String> listItems) { this.listItems = listItems; } public TestBean() { } @PostConstruct public void init(){ System.out.println("Post Construct fired!"); listItems = new ArrayList<String>(); listItems.add("Mango"); listItems.add("Apple"); listItems.add("Banana"); } public void actionListener(){ System.out.println("Action Listener fired!"); } } Do you see any behaviour that should cause postconstruct callback to fire each time? I think JSF 2.0 is highly unstable. If it has to fire PostConstruct each and every time what purpose does @ViewScoped serve. Why not to use @RequestScoped only? I thought i have made some mistake in my application. But when i created this simplest possible in JSF, i still get this error. Am i not understanding the scopes of JSF? or are they not testing it properly? Further, if you remove c:forEach and replace it with ui:repeat, then it works fine. Waiting for replies to confirm whether it is bug or it is intentional to stop the programmers from using jstl?

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  • Pylons and Facebook

    - by Nayan Jain
    The following is my oauth template top.location.href='https://graph.facebook.com/oauth/authorize?client_id=${config['facebook.appid']}&redirect_uri=${config['facebook.callbackurl']}&display=page&scope=publish_stream'; Click here to authorize this application When I hit the page I am prompted to login (desired), upon login I am redirected in a loop between a permissions page and an app page. My controller looks like: class RootController(BaseController): def __before__(self): tmpl_context.user = None if request.params.has_key('session'): access_token = simplejson.loads(request.params['session'])['access_token'] graph = facebook.GraphAPI(access_token) tmpl_context.user = graph.get_object("me") def index(self): if not tmpl_context.user: return render('/oauth_redirect.mako') return render('/index.mako') I'm guessing my settings are off somewhere, probably with the callback. Not to sure if it is an issue with my code or the python sdk for facebook.

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  • Why does Java not have any destructor like C++?

    - by Abhishek Jain
    Java has its own garbage collection implementation so it does not require any destructor like C++ . This makes Java developer lazy in implementing memory management. And Garbage Collection is very expensive. Still we can have destructor along with garbage collector where developer can free resources and which can save garbage collector's work. This might improves the performance of application. Why does Java not provide any destructor kind of mechanism? Developer does not have control over GC but he/she can control or create object. Then why not give them ability to destruct the objects?

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  • How to upload image to remote server in iphone?

    - by Atulkumar V. Jain
    Hi Everybody, I am trying to upload a image which i am clicking with the help of the camera. I am trying the following code to upload the image to the remote server. -(void)searchAction:(UIImage*)theImage { UIDevice *dev = [UIDevice currentDevice]; NSString *uniqueId = dev.uniqueIdentifier; NSData * imageData = UIImagePNGRepresentation(theImage); NSString *postLength = [NSString stringWithFormat:@"%d",[imageData length]]; NSString *urlString = [@"http://www.amolconsultants.com/im.jsp?" stringByAppendingString:@"imagedata=iPhoneV0&mcid="]; urlString = [urlString stringByAppendingString:uniqueId]; urlString = [urlString stringByAppendingString:@"&lang=en_US.UTF-8"]; NSLog(@"The URL of the image is :- %@", urlString); NSMutableURLRequest *request = [[[NSMutableURLRequest alloc] init] autorelease]; [request setURL:[NSURL URLWithString:urlString]]; [request setHTTPMethod:@"POST"]; [request setValue:postLength forHTTPHeaderField:@"Content-Length"]; [request setHTTPBody:imageData]; NSURLConnection *conn=[[NSURLConnection alloc] initWithRequest:request delegate:self]; if (conn == nil) { NSLog(@"Failed to create the connection"); } } But nothing is getting posted. Nothing comes in the console window also. I am calling this method in the action sheet. When the user clicks on the 1st button of the action sheet this method is called to post the image. Can anyone help me with this... Any code will be very helpful... Thanx in advance...

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  • What does this exception mean? and how do i solve this? java

    - by Nitesh Panchal
    Hello, I am using IcePDF component to view pdf in JApplet on my web page. But for some reason i get this error. Can anybody tell why is this happening and how to solve it? Exception in thread "thread applet-applet.KitKitApplet.class-1" java.lang.StackOverflowError at java.util.PropertyPermissionCollection.implies(Unknown Source) at java.security.Permissions.implies(Unknown Source) at sun.security.provider.PolicyFile.implies(Unknown Source) at java.security.ProtectionDomain.implies(Unknown Source) at java.security.AccessControlContext.checkPermission(Unknown Source) at java.security.AccessController.checkPermission(Unknown Source) at java.lang.SecurityManager.checkPermission(Unknown Source) at java.lang.SecurityManager.checkPropertyAccess(Unknown Source) at java.lang.System.getProperty(Unknown Source) at org.icepdf.core.util.Defs.property(Defs.java:59) at org.icepdf.core.util.Defs.property(Defs.java:63) at org.icepdf.core.util.Defs.property(Defs.java:63) at org.icepdf.core.util.Defs.property(Defs.java:63) at org.icepdf.core.util.Defs.property(Defs.java:63) at org.icepdf.core.util.Defs.property(Defs.java:63) at org.icepdf.core.util.Defs.property(Defs.java:63)

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  • Google AJAX Transliteration API :- How do i translate many elements in page to some language at one

    - by Nitesh Panchal
    Hello, I have many elements on page and all of which i want to translate to some language. The language is not the same for all fields, that is, for 1st field it may be fr and for third field it may be en then again for 7th field it may be pa. Basically i wrote the code and it's working :- <script type="text/javascript"> //<![CDATA[ google.load("language", "1"); window.onload = function(){ var elemPostTitles = document.getElementsByTagName("h4"); var flag = true; for(var i = 0 ; i < elemPostTitles.length ; i++){ while(flag == false){ } var postTitleElem = elemPostTitles[i]; var postContentElem = document.getElementById("postContent_" + i); var postTitle = postTitleElem.innerHTML; var postContent = postContentElem.innerHTML; var languageCode = document.getElementById("languageCode_" + i).value; google.language.detect(postTitle, function(result) { if (!result.error && result.language) { google.language.translate(postTitle, result.language, languageCode, function(result) { flag = true; if (result.translation) { postTitleElem.innerHTML = result.translation; } }); } }); flag = false; } As you can see, what i am trying to do is restrict the loop from traversing until the result of previous ajax call is receieved. If i don't do this only the last field gets translated. My code works nicely, but because of the infinite loop, i keep getting errors from Mozilla to "stop executing scripts". How do i get rid of this? Also, is my approach correct? Or some inbuilt function is available which can ease my task? Thanks in advance :)

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  • Family Tree :- myheritage.com

    - by Nitesh Panchal
    Hello, The other day i just accidently visited the site myheritage.com. I was just wondering, how they must have created one? Can anybody tell me what can be their database design? and if possible, algorithm that we can use to generate such a tree? Generating simple binary tree is very easy using recursion. But if you have a look at the site(if you have time please make account on it and add few nodes to feel) when we add son to a father, it's mother is automatically added(if you don't add explicitly). Mother's family tree is also generated side by side and many such fancy things are happening. In a simple binary tree we have a root node and then many nodes below it. Thus we cannot show wife and husband in the tree and then show a line from wife and husband to child. In spare time, can anybody discuss what can be it's database design and the recursive algorithm that we can follow to generate it? I hope i am not asking too much from you :).

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  • dangling pointer, reason for value change after free()?

    - by Aman Jain
    In the following code segment, after free(x), why does y becomes 0? As per my understanding, the memory in the heap that was being pointed to by x, and is still being pointed by y, hasn't been allocated to someone else, so how can it change to 0? And moreover, I don't think it is free(x) that changed it to 0. Any comments? #include <stdio.h> int main ( int argc, char *argv[] ) { int *y = NULL; int *x = NULL; x = malloc(4); *x = 5; y = x; printf("[%d]\n", *y); //prints 5 free(x); printf("[%d]\n", *y); //why doesn't print 5?, prints 0 instead return 0; }

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  • firefox sidebar menu or list of elements. resources/help

    - by sujay-jain
    I am struggling to find any resources on firefox extensions which construct a sidebar and put elements into them. plus tyhe other functionalities within a sidebar. I have made a emptysidebar. Now i need to display a dynamic array(which is formed using a JS function). I have absolutely no idea how to go about it. Can someone please help! this is the code of the sidebar page. I need a xul element like the menuitem where i can display a list of items. How do i get that in a sidebar? <page id="sbEmptySidebar" title="emptysidebar" xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" > <vbox flex="1"> <label id ="l1"> </vbox> </page>

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  • FF extension: displaying an array of string elements in a sidebar

    - by sujay-jain
    I am developing a ff extension which displays a list of elements from an array (dynamic) in the sidebar. The array is dynamic and needs to be constructed in a function everytime the sidebar is opened (or any other event handler). Later, i will need to implement link functionality on parts of the string. What is the best way to go about this? I have created an empty sidebar and just know the label element as of now. menu, and menuitem dont work. What other elements can i use to display text in a good way which supports dynamic contruction. Is there some good tutorial/sample extension which i can see and learn?

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  • Why does this expression not work? JSF

    - by Nitesh Panchal
    Hello, I have a simple problem on .xhtml page. This expression is not working :- <a href="Photos.jsf?albumId=#{item.albumId}&blogId=#{PhotoAlbumsCommonBean.blogId}"> photos </a> I get this error :- Error Parsing /Common/PhotoAlbums.xhtml: Error Traced[line: 20] The reference to entity "blogId" must end with the ';' delimiter. & is causing some kind of error. Thanks in advance :)

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  • A very strange problem related to Flash and Java

    - by Nitesh Panchal
    Hello, I have created one simple program for showing webcam of the user. It works absolutely fine when i am running without integrating it in my java web application. But as soon as i copy paste the same files in Netbeans 6.8 and try to run it. My swf file is visible but the buttons in it are totally unclickable. I get the message of allow or deny showing webcam but the buttons are not clickable. It makes my application totally useless. I thought it's a minor issue but now it's getting on my nerves. I am trying it since 3 hours but didn't find any solution. I don't think anybody faced this issue till now that's why can't seem to find any thread in any forum on it in google. I am using Netbeans 6.8, Ubuntu, Glassfish V3 and JSF. Thanks in advance :). UPDATE:- It works fine on Windows XP. Then what can be the problem with Ubuntu? Any kind of permission rights that i need to give? 2nd UPDATE:- I think this is bug with Flash. I found that this code doesn't work :- <object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,0,0" id="VideoConferenceAdmin" align="middle"> <param name="allowScriptAccess" value="sameDomain" /> <param name="wmode" value="opaque"/> <param name="allowFullScreen" value="false" /> <param NAME="FlashVars" VALUE="rootIp=localhost&amp;userName=admin&amp;roomName=test" /> <param name="movie" value="Conference/VideoConference.swf" /><param name="quality" value="high" /> <embed src="Conference/VideoConference.swf" wmode="window" FlashVars="rootIp=localhost&amp;userName=test&amp;roomName=test" quality="high" width="600" height="500" name="VideoConference" align="middle" allowScriptAccess="sameDomain" allowFullScreen="false" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" /> </object> And this one works :- <object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,0,0" id="VideoConferenceAdmin" align="middle"> <param name="allowScriptAccess" value="sameDomain" /> <param name="wmode" value="opaque"/> <param name="allowFullScreen" value="false" /> <param NAME="FlashVars" VALUE="rootIp=localhost&amp;userName=admin&amp;roomName=test" /> <param name="movie" value="Conference/VideoConference.swf" /><param name="quality" value="high" /> <embed src="Conference/VideoConference.swf" wmode="window" FlashVars="rootIp=localhost&amp;userName=test&amp;roomName=test" quality="high" name="VideoConference" align="middle" allowScriptAccess="sameDomain" allowFullScreen="false" type="application/x-shockwave-flash" pluginspage="http://www.macromedia.com/go/getflashplayer" /> </object> As you can see, just by removing the height and width attribute the panels of Flash settings work fine. I know you will find me funny but i am not. You can check out on your own if you don't trust me. Now, my question would be, can anybody tell me how do i set height and width of swf? I want it to be 600px width and 500px height. Even the style attribute doesn't work. Can i set height and width from within Flash? because without explicitly setting height and width, it looks very small. I think this should be very easy for all now. Thanks in advance :)

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  • Replacing text node of HTML input in PHP

    - by Aman Kumar Jain
    Hi, I want to replace all the text nodes in a html text. I'll explain with an example: $html = " <div> <p> text2 text2 word text2 <span>abcd</span> text2 text2 word text2 <p> this is a long, very long statement with punctuations. </div> I want to replace "text2 text2 word text2" with "<span>text2 text2 word text2</span>" and "this is a long, very long statement with punctuations." with "<span>this is a long, very long statement with punctuations.</span>" What should be the regular expression for the same?

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  • how to calculate total days from starting date to end date in c#,.net?

    - by Rishabh jain
    i m making a project in which i have to calculate total number of days from starting date to ending date which are inserted in text box by user at run time in asp.net c#.i have to do this on button_click event.how to do this? i tried this- protected void TextBox14_TextChanged(object sender, EventArgs e) { // get date from first text box DateTime dold = Convert.ToDateTime(TextBox1.Text); DateTime dnew = Convert.ToDateTime(TextBox14.Text); TimeSpan daydif = (dnew - dold); double dayd = daydif.TotalDays; Label27.Text = dayd.ToString(); }

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  • Are entities cached in jpa by default ?

    - by Nitesh Panchal
    Hello, I add entity to my database and it works fine. But when i retrieve the List, i get the old entity, the new entities i add are not shown until i undeploy the application and redeploy it again. This means are my entities cached by default? But, I haven't made any settings for caching entities in my persistence.xml or any such file. I have even tried calling flush(), refresh() and merge(). But still it shows the old entities only. Am i missing something? Please help me.

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