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  • What is the effect of final variable declaration in methods?

    - by Finbarr
    Classic example of a simple server: class ThreadPerTaskSocketServer { public static void main(String[] args) throws IOException { ServerSocket socket = new ServerSocket(80); while (true) { final Socket connection = socket.accept(); Runnable task = new Runnable() { public void run() { handleRequest(connection); } }; new Thread(task).start(); } } } Why should the Socket be declared as final? Is it because the new Thread that handles the request could refer back to the socket variable in the method and cause some sort of ConcurrentModificationException?

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  • Does close ever throw an IOException?

    - by TofuBeer
    After providing some answers here, and reading some comments, it would seem that, in practice IOException is never thrown on close for file I/O. Are there any cases in which calling close on a Stream/Reader/Writer actually throws an IOException? If an exception is actually thrown, how should it be dealt with?

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  • [Android] XML Parser

    - by lemon
    I'm trying to extract n0Y7ezLlIYA8R0K54rEmHaTOraBQVSPDjQaGlQxlGso4jdVN1kRxtcfskEs= using w3c dom <html> <div id='token' style='display:none;'> n0Y7ezLlIYA8R0K54rEmHaTOraBQVSPDjQaGlQxlGso4jdVN1kRxtcfskEs= </div> </html> but I seem to be stuck DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder(); Document doc = builder.parse(con.getInputStream()); NodeList list = doc.getElementsByTagName("div"); Can someone please point me to some basic tutorials that would help me solve my dilemma. Thanks.

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  • Updated data is not loaded in the same browser(using Ajax )

    - by Mouli
    Initilly load some datas into dropdown list. It contain company code and company related fields in Textbox. Using Ajax to load the company related Fields in onchange Function I edit the company related fields and update it. Its updated Successfully then i Click the back button and refresh the browser. I select the updated company form the dropdown list. It always list the old value insted of updated data. I want to show the updated fields into corresponding textbox. This part of coding is to load the companyname into dropdown list <% DBAccess dbAccess = Util.initDatabaseAccess(); ResultSet rs = null; ResultSet rsEdit = null; int updateSuccess = 0; String button = request.getParameter("saveAction"); rs = dbAccess.executeQuery("select companyname,Companycode,companyid from yosemitecompany where cmpstatus=1 order by companyname"); %> My Ajax function <script> function showCompanyDetails(str) { if (str=="") { document.getElementById("CompanyName").innerHTML=""; return; } if (window.XMLHttpRequest) { xmlhttp=new XMLHttpRequest(); } else { xmlhttp=new ActiveXObject("Microsoft.XMLHTTP"); } xmlhttp.onreadystatechange=function() { if (xmlhttp.readyState==4 && xmlhttp.status==200) { var resValue=new Array(); resValue = xmlhttp.responseText.split("$"); document.getElementById("CompanyName").value=resValue[0]; document.getElementById("StreetName1").value=(resValue[1]!=null && !resValue[1].equalsIgnoreCase("null") && resValue[1].length>0?resValue[1]:""); document.getElementById("StreetName2").value=(resValue[2]!=null && !resValue[2].equalsIgnoreCase("null") && resValue[2].length>0?resValue[2]:""); document.getElementById("City").value=(resValue[3]!=null && !resValue[3].equalsIgnoreCase("null") && resValue[3].length>0?resValue[3]:""); document.getElementById("Zipcode").value=trim((resValue[5]!=null && !resValue[5].equalsIgnoreCase("null") && resValue[5].length>0?resValue[5]:"")); document.getElementById("officePhone").value=(resValue[6]!=null && !resValue[6].equalsIgnoreCase("null") && resValue[6].length>0?resValue[6]:""); document.getElementById("Fax1").value=(resValue[7]!=null && !resValue[7].equalsIgnoreCase("null") && resValue[7].length>0?resValue[7]:""); document.getElementById("email").value=(resValue[8]!=null && !resValue[8].equalsIgnoreCase("null") && resValue[8].length>0?resValue[8]:""); document.getElementById("WebSite").value=(resValue[9]!=null && !resValue[9].equalsIgnoreCase("null") && resValue[9].length>0?resValue[9]:""); document.getElementById("description").value=(resValue[10]!=null && !resValue[10].equalsIgnoreCase("null") && resValue[10].length>0?resValue[10]:""); document.getElementById("companycode").value=resValue[11]; document.getElementById("tempCompanyId").value=resValue[12]; document.getElementById("tempStateId").value=resValue[13]; stateID = resValue[13]; countryID = resValue[14]; processAjaxRequestPost('ajaxRequestPost','SingleListHandler','getCountryListDetails', document.getElementById("tempCompanyId").value); showTimezone(resValue[15]); document.getElementById("userName").value=resValue[16]; document.getElementById("passWord").value=resValue[17]; } } xmlhttp.open("GET","customerDetail.jsp?val="+str,true); xmlhttp.send(); } </script> My Update function <%if(updateSuccess <= 0){ if(button != null && button.equalsIgnoreCase("update")) { String companyCode = request.getParameter("companycode").trim(); String companyName = request.getParameter("CompanyName").trim(); String StreetName1 = request.getParameter("StreetName1").trim(); String StreetName2 = request.getParameter("StreetName2").trim(); String City = request.getParameter("City").trim(); String Zipcode = request.getParameter("Zipcode").trim(); String officePhone = request.getParameter("officePhone").trim(); String Fax1 = request.getParameter("Fax1").trim(); String email = request.getParameter("email").trim(); String WebSite = request.getParameter("WebSite").trim(); String description = request.getParameter("description").trim(); String companyid = request.getParameter("tempCompanyId").trim(); String stateId = request.getParameter("tempStateId").trim(); String timeZone = request.getParameter("timezone").trim(); String uploadCustomerLogo = request.getParameter("uploadCustomerLogo").trim(); String userName = request.getParameter("userName").trim(); String passWord = request.getParameter("passWord").trim(); String smtpInsertFlag = "NO"; String getCompanyId = null; updateSuccess = dbAccess.executeUpdate("update yosemitecompany set companyname='"+com.zoniac.util.Util.deQuoteForSingleQuote(companyName)+"', streetname1='"+com.zoniac.util.Util.deQuoteForSingleQuote(StreetName1)+"', streetname2='"+com.zoniac.util.Util.deQuoteForSingleQuote(StreetName2)+"', cityname='"+com.zoniac.util.Util.deQuoteForSingleQuote(City)+"', zipcode='"+com.zoniac.util.Util.deQuoteForSingleQuote(Zipcode)+"', phonenumber1='"+com.zoniac.util.Util.deQuoteForSingleQuote(officePhone)+"', fax1='"+com.zoniac.util.Util.deQuoteForSingleQuote(Fax1)+"', email1='"+com.zoniac.util.Util.deQuoteForSingleQuote(email)+"', website='"+com.zoniac.util.Util.deQuoteForSingleQuote(WebSite)+"', description='"+com.zoniac.util.Util.deQuoteForSingleQuote(description)+"',timezoneid="+timeZone+", stateid="+stateId+" where companyid='"+companyid+"'"); if(rs != null) { rs = null; dbAccess.close(); } } %> My customerDetail.jsp File <% String val = request.getParameter("val"); DBAccess dbAccess = Util.initDatabaseAccess(); ResultSet rs = null; String outputResult = null; String ff = "NO"; rs = dbAccess.executeQuery("select companyname,streetname1,streetname2,cityname,(select statename from state where stateid = (select stateid from yosemitecompany where companyid ="+val+"))as state,zipcode,phonenumber1,fax1,email1,website,description,companycode,companyid,(select stateid from state where stateid = (select stateid from yosemitecompany where companyid ="+val+"))as statecode,(select countryid from country where countryid =(select countryid from state where stateid = (select stateid from yosemitecompany where companyid ="+val+")))as countryid,timezoneid from yosemitecompany where companyid = "+val+""); if(rs.next()){ outputResult = rs.getString(1)+"$"+rs.getString(2)+"$"+rs.getString(3)+"$"+rs.getString(4)+"$"+rs.getString(5)+"$"+rs.getString(6)+"$"+rs.getString(7)+"$"+rs.getString(8)+"$"+rs.getString(9)+"$"+rs.getString(10)+"$"+rs.getString(11)+"$"+rs.getString(12)+"$"+rs.getString(13)+"$"+rs.getString(14)+"$"+rs.getString(15)+"$"+rs.getString(16); } rs = null; rs = dbAccess.executeQuery("select username,password from EMAILAUTHENTICATIONDETAILS where companyid="+val); if(rs.next()){ ff="YES"; outputResult += "$"+rs.getString(1)+"$"+rs.getString(2); } if(ff.equals("NO")){ outputResult += "$$"; } out.println(outputResult); outputResult = null; ff = "NO"; if(rs!=null) { rs = null; dbAccess.close(); } %>

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  • How do I prevent use of beta classes from google guava library?

    - by mjlee
    We have been using Google collections in the production for several months. We would like to start using guava for additional functions. However, I'm afraid to bring guava into our product stack b/c some developers may start to use 'beta' classes. We have various unit-tests in our code but at this point, I prefer not to include 'beta' class b/c it is subject to change in the future. Is there any easy way to do detect if the project includes any 'beta' guava classes?

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  • Can JAXB store the class name in the XML so that the the deserialize code doesn't need knowledge of the class?

    - by Andrew
    It seems the standard approach for deserializing JAXB XML is to specify the package name when creating the context. Then, JAXB looks up the class based on the root element: JAXBContext jc = JAXBContext.newInstance("com.foo"); Unmarshaller u = jc.createUnmarshaller(); Object o = u.unmarshal(new StringReader("...")); I'm looking for a more flexible approach where I don't have to specify the package name and could still deserialize any object. This would be as simple as JAXB storing the package in the XML, but I can't seem to find out how to do this. I can write the code to do it myself but that would be unpleasant. It would like JAXB to do it, if possible. BTW, I am not using schemas, just Annotations and marshal/unmarshal. Any ideas?

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  • How to inspect JSP request URL for String

    - by IAmYourFaja
    I have the following processor.jsp file: <% response.sendRedirect("http://buzz.example.com"); %> I want to change it so that it inspects the HTTP request URL for the presence of the word "fizz" and, if it exists, redirect the user to http://fizz.example.org instead. So something like: <% String reqUrl = request.getURL().toLowerCase(); String token = null; if(reqUrl.contains("fizz")) { token = "fizz"; } else { token = "buzz"; } String respUrl = "http://%%%TOKEN%%%.example.com".replace("%%%TOKEN%%%", token); response.sendRedirect(respUrl); %> However this doesn't work. Any ideas on what I should be using instead of request, or if I'm doing anything else wrong?

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  • HTML Dynamic Number of Dropdowns

    - by Evilsithgirl
    I have this form on which I would like to create a dynamic number of dropdowns. I have a list of categorized applications which I would like each to have its own dropdown that submits data for each dropdown. The dropdown options will be the same for each. Here is my code. I am not sure how to pass the unique data to the server. As you can see I currently have an iteration over a list of applications that I would like to make each select in that iteration its own dropdown. Thanks in advance. <html:form action="/CategorizeApps.do"> <h3>Uncategorized</h3> <br/> Categorize each application using the dropdown menu then click categorize.<br/> <table class="list"> <thead> <tr class="controls"> <td><input type="submit" name="btnAction" value="Categorize"/></td> </tr> <tr class="fields"> <td>ID</td> <td>Name</td> <td></td> </tr> </thead> <tbody> <logic:iterate id="uncat" name="appsUncat" scope="session"> <tr class="hlist"> <td><bean:write property="id" name="uncat" scope="page"/></td> <td><bean:write property="name" name="uncat" scope="page"/></td> <td><select id="category" name="category"> <logic:iterate id="categories" name="Categories" scope="session"> <option value="<bean:write name="categories" property="id" scope="page"/>"><bean:write name="categories" property="name" scope="page"/></option> </logic:iterate> </select></td> </tr> </logic:iterate> </tbody> </table> </html:form>

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  • controlling the order of submitted futures

    - by mac
    In this example, i am submitting a few files to my comparator object. It all works fine, except that i noticed that order in which files are submitted is not always teh same order in which they are returned. Any suggestions on how i can better control this? ExecutorService pool = Executors.newFixedThreadPool(5); CompletionService<Properties> completion = new ExecutorCompletionService<Properties>(pool); for (String target : p.getTargetFiles()) { completion.submit(new PropertiesLoader(target, p)); } for (@SuppressWarnings("unused") String target : p.getTargetFiles()) { Properties r = null; try { r = completion.take().get(); } catch (InterruptedException e) { e.printStackTrace(); } catch (ExecutionException e) { e.printStackTrace(); } p.addTargetFilesProperties(r); } pool.shutdown();

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  • Any tools or techniques for validating constraints programmatically between databases?

    - by Brandon
    If you had two databases, that had two tables between them that would normally implement a one to one (or many to many) constraint but cannot since they are separate databases, how would you validate this relationship in an application or test? Is there a simple way to do this? For example, a tool or technique that can, given a constraint type, tables and fields, does the validation. I imagine that this isn't the first time this come up so I'm hoping people can share their solution. Thanks.

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  • adding filter to bluetooth discovery

    - by user1643325
    I want to just discover peripheral devices when i start my Bluetooth Device discovery, my app must not discover/show other devices. is this any how possible? this is how i am searching for devices IntentFilter filter = new IntentFilter("android.bluetooth.devicepicker.action.DEVICE_SELECTED"); registerReceiver(mBtPickReceiver,filter); startActivity(new Intent("android.bluetooth.devicepicker.action.LAUNCH") .putExtra("android.bluetooth.devicepicker.action.EXTRA_NEED_AUTH",false));

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  • Getting the right result of mouse click event

    - by Jessy
    Hello, I'm curious why I got the "right" BUT "wrong"number of result when I click the mouse. I supposed to print on the console mouseClicked once everytimes the mouse is clicked. However I got many of them printed out everytimes I clicked the mouse ...sometimes 5 e.g. mouseClicked mouseClicked mouseClicked mouseClicked mouseClicked Instead of just mouseClicked Why? public void mouseClicked(MouseEvent arg0) { System.out.println("mouseClicked"); }

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  • FileConnection Blackberry memory usage

    - by Dean
    Hello, I'm writing a blackberry application that reads ints and strings out of a database. This is my first time dealing with reading/writing on the blackberry, so forgive me if this is a dumb question. The database file I'm reading is only about 4kB I open the file with the following code fconn = (FileConnection) Connector.open("file_path_here", Connector.READ); if(fconn.exists()==false){fconn.close();return;} is = fconn.openDataInputStream(); while(!eof){ //etc... } is.close(); fconn.close(); The problem is, this code appears to be eating a LOT of memory. Using breakpoints and the "Memory Statistics" view, I determined the following: calling "Connector.open" creates 71 objects and changes "RAM Bytes in use" by 5376 calling "fconn.openDataInputStream();" increases RAM usage by a whopping 75920 Is this normal? Or am I doing something wrong? And how can I fix this? 75MB of RAM is a LOT of memory to waste on a handheld device, especially when the file I'm reading is only 4kB and I haven't even begun reading any data! How is this even possible?

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  • ant conditions problem

    - by senzacionale
    I have problem with ant. I woul dlike to use conditions in ant. But i get error of: BUILD FAILED C:\Projekti\Projekt ANT\build.xml:412: Problem: failed to create task or type Cause: The name is undefined. Action: Check the spelling. Action: Check that any custom tasks/types have been declared. Action: Check that any / declarations have taken place. and this is code: <target name="test"> <input message="Write some text: " addproperty="foo" /> <if> <equals arg1="${foo}" arg2="bar" /> <then> <echo message="The value of property foo is 'bar'" /> </then> <elseif> <equals arg1="${foo}" arg2="foo" /> <then> <echo message="The value of property foo is 'foo'" /> </then> </elseif> <else> <echo message="The value of property foo is not 'foo' or 'bar'" /> </else> </if> </target>

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  • Making an efficient algorithm

    - by James P.
    Here's my recent submission for the FB programming contest (qualifying round only requires to upload program output so source code doesn't matter). The objective is to find two squares that add up to a given value. I've left it as it is as an example. It does the job but is too slow for my liking. Here's the points that are obviously eating up time: List of squares is being recalculated for each call of getNumOfDoubleSquares(). This could be precalculated or extended when needed. Both squares are being checked for when it is only necessary to check for one (complements). There might be a more efficient way than a double-nested loop to find pairs. Other suggestions? Besides this particular problem, what do you look for when optimizing an algorithm? public static int getNumOfDoubleSquares( Integer target ){ int num = 0; ArrayList<Integer> squares = new ArrayList<Integer>(); ArrayList<Integer> found = new ArrayList<Integer>(); int squareValue = 0; for( int j=0; squareValue<=target; j++ ){ squares.add(j, squareValue); squareValue = (int)Math.pow(j+1,2); } int squareSum = 0; System.out.println( "Target=" + target ); for( int i = 0; i < squares.size(); i++ ){ int square1 = squares.get(i); for( int j = 0; j < squares.size(); j++ ){ int square2 = squares.get(j); squareSum = square1 + square2; if( squareSum == target && !found.contains( square1 ) && !found.contains( square2 ) ){ found.add(square1); found.add(square2); System.out.println( "Found !" + square1 +"+"+ square2 +"="+ squareSum); num++; } } } return num; }

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  • Generating different randoms valid for a day on different independent devices?

    - by Pentium10
    Let me describe the system. There are several mobile devices, each independent from each other, and they are generating content for the same record id. I want to avoid generating the same content for the same record on different devices, for this I though I would use a random and make it so too cluster the content pool based on these randoms. Suppose you have choices from 1 to 100. Day 1 Device#1 will choose for the record#33 between 1-10 Device#2 will choose for the record#33 between 40-50 Device#3 will choose for the record#33 between 50-60 Device#1 will choose for the record#55 between 40-50 Device#2 will choose for the record#55 between 1-10 Device#3 will choose for the record#55 between 10-20 Device#1 will choose for the record#11 between 1-10 Device#2 will choose for the record#22 between 1-10 Device#3 will choose for the record#99 between 1-10 Day 2 Device#1 will choose for the record#33 between 90-100 Device#2 will choose for the record#33 between 1-10 Device#3 will choose for the record#33 between 50-60 They don't have access to a central server. Data available for each of them: IMEI (unique per mobile) Date of today (same on all devices) Record id (same on all devices) What do you think, how is it possible? ps. tags can be edited

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