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• JEditorPane Code Completion (Part 2)

  - by Geertjan

  Figured it out! No need to create a fake Java file, unlike what I said in part 1, no need to depend on all the Java Editor modules, if you use DialogBinding.bindComponentToDocument, instead of DialogBinding.bindComponentToFile: public final class CountryEditorTopComponent extends TopComponent {     public CountryEditorTopComponent() {         initComponents();         setName(Bundle.CTL_CountryEditorTopComponent());         setToolTipText(Bundle.HINT_CountryEditorTopComponent());         EditorKit kit = CloneableEditorSupport.getEditorKit("text/plain");         jEditorPane1.setEditorKit(kit);         DialogBinding.bindComponentToDocument(jEditorPane1.getDocument(), 0, 0, jEditorPane1);         jEditorPane1.setText("Egypt");     } The above requires a dependency on Editor Library 2, which is where DialogBinding is found. Aside from that, you need all the dependencies required by the Code Completion API, as described in the Code Completion tutorial on the NetBeans Platform Learning Trail. Once you've done that, go to the Project Properties dialog of the application and then in the "ide" cluster, include "Plain Editor" and "Plain Editor Library". I.e., two additional JARs only. These two are needed because you've set the MIME type to "text/plain", which is needed because DialogBinding expects the JEditorPane to have a MIME type. And now everything works. Press Ctrl-Space in your JEditorPane and, because your CompletionProvider is registered in "text/x-dialog-binding" (via the annotation on CompletionProvider), your completion items are displayed. (The only MIME type for binding a document to a component, by default, is "text/x-dialog-binding", which means the next step is for someone to figure out how to support multiple different of such MIME types, since each JEditorPane in your application is likely to require its own specific code completion support.) I think this is a really workable solution for real scenarios where JEditorPanes in NetBeans Platform applications require code completion.

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• How to find where error is.

  - by gurugio

  How can I find where the error occurs? In C language, the return value means what error occurs, such as failure to open file or memory allocation. There is no information where the error occurs. For example, function 'foo' calls A,B,C,D. If foo returns an error value, it might be return value of A or B or C or D. I cannot find what function returns error. I have to run debugger or add some codes to find what function returns error.

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• C# and XML Source Code Documentation

  Demonstrates how to use C#.NET's XML source documentation to produce professional, indexed, and searchable source documentation.

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• Should a Perl constructor return an undef or a "invalid" object?

  - by DVK

  Question: What is considered to be "Best practice" - and why - of handling errors in a constructor?. "Best Practice" can be a quote from Schwartz, or 50% of CPAN modules use it, etc...; but I'm happy with well reasoned opinion from anyone even if it explains why the common best practice is not really the best approach. As far as my own view of the topic (informed by software development in Perl for many years), I have seen three main approaches to error handling in a perl module (listed from best to worst in my opinion): Construct an object, set an invalid flag (usually "is_valid" method). Often coupled with setting error message via your class's error handling. Pros: Allows for standard (compared to other method calls) error handling as it allows to use $obj->errors() type calls after a bad constructor just like after any other method call. Allows for additional info to be passed (e.g. 1 error, warnings, etc...) Allows for lightweight "redo"/"fixme" functionality, In other words, if the object that is constructed is very heavy, with many complex attributes that are 100% always OK, and the only reason it is not valid is because someone entered an incorrect date, you can simply do "$obj->setDate()" instead of the overhead of re-executing entire constructor again. This pattern is not always needed, but can be enormously useful in the right design. Cons: None that I'm aware of. Return "undef". Cons: Can not achieve any of the Pros of the first solution (per-object error messages outside of global variables and lightweight "fixme" capability for heavy objects). Die inside the constructor. Outside of some very narrow edge cases, I personally consider this an awful choice for too many reasons to list on the margins of this question. UPDATE: Just to be clear, I consider the (otherwise very worthy and a great design) solution of having very simple constructor that can't fail at all and a heavy initializer method where all the error checking occurs to be merely a subset of either case #1 (if initializer sets error flags) or case #3 (if initializer dies) for the purposes of this question. Obviously, choosing such a design, you automatically reject option #2.

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• I'm getting an error in my Java code but I can't see whats wrong with it. Help?

  - by Fraz

  The error i'm getting is in the fillPayroll() method in the while loop where it says payroll.add(employee). The error says I can't invoke add() on an array type Person but the Employee class inherits from Person so I thought this would be possible. Can anyone clarify this for me? import java.io.*; import java.util.*; public class Payroll { private int monthlyPay, tax; private Person [] payroll = new Person [1]; //Method adds person to payroll array public void add(Person person) { if(payroll[0] == null) //If array is empty, fill first element with person { payroll[payroll.length-1] = person; } else //Creates copy of payroll with new person added { Person [] newPayroll = new Person [payroll.length+1]; for(int i = 0;i<payroll.length;i++) { newPayroll[i] = payroll[i]; } newPayroll[newPayroll.length] = person; payroll = newPayroll; } } public void fillPayroll() { try { FileReader fromEmployee = new FileReader ("EmployeeData.txt"); Scanner data = new Scanner(fromEmployee); Employee employee = new Employee(); while (data.hasNextLine()) { employee.readData(data.nextLine()); payroll.add(employee); } } catch (FileNotFoundException e) { System.out.println("Error: File Not Found"); } } }

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• SVN checkout returns 400 error

  - by eboix

  I'm trying to download the http://code.opencv.org/svn/opencv/trunk/ repository of all of the OpenCV source code - as specified in an OpenCV installation tutorial. In the tutorial, the repository https://code.ros.org/svn/opencv/trunk/ is used, but they moved it to http://code.opencv.org/svn/opencv/trunk/, and now you need a password to access the code.ros.org repository. Anyway, I'm using TortoiseSVN to download the SVN repository. (I get the same error with http://sourceforge.net/projects/win32svn/) I get this: Checkout from http://code.opencv.org/svn/opencv/trunk, revision HEAD, Fully recursive, Externals included Server sent unexpected return value (400 Bad request. Method Unknown) in response to REPORT request for '/svn/opencv/!svn/vcc/default' On the TortoiseSVN site I found something about this 400 error: You're behind a firewall which blocks DAV requests. Most firewalls do that. Either ask your Administrator to change the firewall, or access the repository with https:// instead of http:// like in https://svn.collab.net/repos/svn/ That way you connect to the repository with SSL encryption, which firewalls can't interfere with (if they don't block the SSL port completely). Also some virus scanners (i.e. Kapersky) are known to interfere and cause this error. The code.ros.org repository is https://, so I would be able to access it, but I need a password, so I can't. I made an account on ros.org, but it seems that I still need a password (which I don't know) to access the code repository. My username-password combination does not work. I unblocked all of the TortoiseSVN programs in my firewall settings. Nothing changed. I temporarily stopped my firewall to see if it was interfering with my request. I got the same error. How can I do an svn checkout http://code.opencv.org/svn/opencv/trunk/opencv/ so that I don't get this error? Is there any way to make it https://? Any help would be appreciated!

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• How to Collect Debug Info for Oracle SQL Developer

  - by thatjeffsmith

  In a perfect world, there would be no software bugs. Developers would always test their code. QA would find any scenarios and bugs the developers hadn’t already thought of. Regression tests would be complete and flawless. But alas, we can only afford to pay mere humans here, so we will have bugs from time to time. Or sometimes you are trying to do something the software wasn’t designed for, or perhaps your machine has exhausted it’s resources trying to build the un-buildable. When you run into problems, you will need help. Developers need your help so they can help you. Surprisingly enough, feedback like this isn’t very helpful: Your program isn’t working. How can I make it work? When you are ready to work with us on the SQL Developer OTN forum, you will most likely be asked to run SQL Developer and capture the output from the command console. In case you need help with this, ere’s a step-by-step process you can follow in Windows 7 (should work in XP too.) Open a windows command window Start – Run – CMD Once it’s open, click on the window icon and select ‘Defaults.’ Change the default buffer size to be something bigger, much bigger. Set the CMD window default buffer size HIGHER Note: you only need to do this once. Navigate to your SQL Developer Installation Folder Instead of running the ‘sqldeveloper.exe’ file in the root directory, we are going to go several sub-directories down. Find the ‘bin’ sub-directory and run the ‘sqldeveloper.exe’ there. When you do this, a CMD window will open, and then you’ll see the SQL Developer application load. The SQL Developer bin directory - run the tool from here and get a logging window Use SQL Developer as normal, until it ‘breaks’ or ‘hangs’ Now, you are ready to grab the nitty-gritty information that MIGHT tell the developer what is going wrong or happening in your scenario. Click back into the CMD window Send a Ctrl+Break or a Ctrl+Pause. If you on a newer laptop that doesn’t have this key, be sure to check the ‘Fn’ subset of keys. If you need to map the BREAK or PAUSE buttons, this article might help. You can also try the on-screen keyboard in windows – just type ‘OSK’ in your START – RUN prompt. Copy the logging information from the command window – all of it We need this information, help us get it! Open a case with Oracle Support or Start a Thread on the Forums Or email me. If you’re on my blog reading this, it’s the least I can do to help Now, before you hit ‘Send’ or ‘Post’ or ‘Submit’ – be sure to add a brief description of what you were doing in the application when you ran into the problem. Even if you were doing ‘nothing,’ let us know how many connections you had open, what windows were active, etc. The more you can tell us, the higher your odds go up to getting a quick fix or at least an answer as to what is happening. Also include the following information: The version of SQL Developer you are running The version of the JDK you are using The OS you are using The version of Oracle you are connected to Now, don’t be surprised if you get asked to upgrade to a supported configuration, say ‘version 3.1 and the 1.6 JDK.’ Supporting older versions of software is fun, and while we enjoy a challenge, it may be easier for you to upgrade your way out of the problem at hand.

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• How to propagate http response code from back-end to client

  - by Manoj Neelapu

  Oracle service bus can be used as for pass through casses. Some use cases require propagating the http-response code back to the caller. http://forums.oracle.com/forums/thread.jspa?messageID=4326052&#4326052 is one such example we will try to accomplish in this tutorial.We will try to demonstrate this feature using Oracle Service Bus (11.1.1.3.0. We will also use commons-logging-1.1.1, httpcomponents-client-4.0.1, httpcomponents-core-4.0.1 for writing the client to demonstrate.First we create a simple JSP which will always set response code to 304.The JSP snippet will look like <%@ page language="java"     contentType="text/xml;     charset=UTF-8"        pageEncoding="UTF-8" %><%      System.out.println("Servlet setting Responsecode=304");    response.setStatus(304);    response.flushBuffer();%>We will now deploy this JSP on weblogic server with URI=http://localhost:7021/reponsecode/For this JSP we will create a simple Any XML BS We will also create proxy service as shown below Once the proxy is created we configure pipeline for the proxy to use route node, which invokes the BS(JSPCaller) created in the first place. So now we will create a error handler for route node and will add a stage. When a HTTP BS sends a request, the JSP sends the response back. If the response code is not 200, then the http BS will consider that as error and the above configured error handler is invoked. We will print $outbound to show the response code sent by the JSP. The next actions. To test this I had create a simple clientimport org.apache.http.Header;import org.apache.http.HttpEntity;import org.apache.http.HttpHost;import org.apache.http.HttpResponse;import org.apache.http.HttpVersion;import org.apache.http.client.methods.HttpGet;import org.apache.http.conn.ClientConnectionManager;import org.apache.http.conn.scheme.PlainSocketFactory;import org.apache.http.conn.scheme.Scheme;import org.apache.http.conn.scheme.SchemeRegistry;import org.apache.http.impl.client.DefaultHttpClient;import org.apache.http.impl.conn.tsccm.ThreadSafeClientConnManager;import org.apache.http.params.BasicHttpParams;import org.apache.http.params.HttpParams;import org.apache.http.params.HttpProtocolParams;import org.apache.http.util.EntityUtils;/** * @author MNEELAPU * */public class TestProxy304{    public static void main(String arg[]) throws Exception{     HttpHost target = new HttpHost("localhost", 7021, "http");     // general setup     SchemeRegistry supportedSchemes = new SchemeRegistry();     // Register the "http" protocol scheme, it is required     // by the default operator to look up socket factories.     supportedSchemes.register(new Scheme("http",              PlainSocketFactory.getSocketFactory(), 7021));     // prepare parameters     HttpParams params = new BasicHttpParams();     HttpProtocolParams.setVersion(params, HttpVersion.HTTP_1_1);     HttpProtocolParams.setContentCharset(params, "UTF-8");     HttpProtocolParams.setUseExpectContinue(params, true);     ClientConnectionManager connMgr = new ThreadSafeClientConnManager(params,              supportedSchemes);     DefaultHttpClient httpclient = new DefaultHttpClient(connMgr, params);     HttpGet req = new HttpGet("/HttpResponseCode/ProxyExposed");     System.out.println("executing request to " + target);     HttpResponse rsp = httpclient.execute(target, req);     HttpEntity entity = rsp.getEntity();     System.out.println("----------------------------------------");     System.out.println(rsp.getStatusLine());     Header[] headers = rsp.getAllHeaders();     for (int i = 0; i < headers.length; i++) {         System.out.println(headers[i]);     }     System.out.println("----------------------------------------");     if (entity != null) {         System.out.println(EntityUtils.toString(entity));     }     // When HttpClient instance is no longer needed,      // shut down the connection manager to ensure     // immediate deallocation of all system resources     httpclient.getConnectionManager().shutdown();     }}On compiling and executing this we see the below output in STDOUT which clearly indicates the response code was propagated from Business Service to Proxy serviceexecuting request to http://localhost:7021----------------------------------------HTTP/1.1 304 Not ModifiedDate: Tue, 08 Jun 2010 16:13:42 GMTContent-Type: text/xml; charset=UTF-8X-Powered-By: Servlet/2.5 JSP/2.1----------------------------------------  

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• My error with upgrading 4.0 to 4.2- What NOT to do...

  - by Steve Tunstall

  Last week, I was helping a client upgrade from the 2011.1.4.0 code to the newest 2011.1.4.2 code. We downloaded the 4.2 update from MOS, upload and unpacked it on both controllers, and upgraded one of the controllers in the cluster with no issues at all. As this was a brand-new system with no networking or pools made on it yet, there were not any resources to fail back and forth between the controllers. Each controller had it's own, private, management interface (igb0 and igb1) and that's it. So we took controller 1 as the passive controller and upgraded it first. The first controller came back up with no issues and was now on the 4.2 code. Great. We then did a takeover on controller 1, making it the active head (although there were no resources for it to take), and then proceeded to upgrade controller 2. Upon upgrading the second controller, we ran the health check with no issues. We then ran the update and it ran and rebooted normally. However, something strange then happened. It took longer than normal to come back up, and when it did, we got the "cluster controllers on different code" error message that one gets when the two controllers of a cluster are running different code. But we just upgraded the second controller to 4.2, so they should have been the same, right??? Going into the Maintenance-->System screen of controller 2, we saw something very strange. The "current version" was still on 4.0, and the 4.2 code was there but was in the "previous" state with the rollback icon, as if it was the OLDER code and not the newer code. I have never seen this happen before. I would have thought it was a bad 4.2 code file, but it worked just fine with controller 1, so I don't think that was it. Other than the fact the code did not update, there was nothing else going on with this system. It had no yellow lights, no errors in the Problems section, and no errors in any of the logs. It was just out of the box a few hours ago, and didn't even have a storage pool yet. So.... We deleted the 4.2 code, uploaded it from scratch, ran the health check, and ran the upgrade again. once again, it seemed to go great, rebooted, and came back up to the same issue, where it came to 4.0 instead of 4.2. See the picture below.... HERE IS WHERE I MADE A BIG MISTAKE.... I SHOULD have instantly called support and opened a Sev 2 ticket. They could have done a shared shell and gotten the correct Fishwork engineer to look at the files and the code and determine what file was messed up and fixed it. The system was up and working just fine, it was just on an older code version, not really a huge problem at all. Instead, I went ahead and clicked the "Rollback" icon, thinking that the system would rollback to the 4.2 code.   Ouch... What happened was that the system said, "Fine, I will delete the 4.0 code and boot to your 4.2 code"... Which was stupid on my part because something was wrong with the 4.2 code file here and the 4.0 was just fine.  So now the system could not boot at all, and the 4.0 code was completely missing from the system, and even a high-level Fishworks engineer could not help us. I had messed it up good. We could only get to the ILOM, and I had to re-image the system from scratch using a hard-to-get-and-use FishStick USB drive. These are tightly controlled and difficult to get, almost always handcuffed to an engineer who will drive out to re-image a system. This took another day of my client's time.  So.... If you see a "previous version" of your system code which is actually a version higher than the current version... DO NOT ROLL IT BACK.... It did not upgrade for a very good reason. In my case, after the system was re-imaged to a code level just 3 back, we once again tried the same 4.2 code update and it worked perfectly the first time and is now great and stable.  Lesson learned.  By the way, our buddy Ryan Matthews wanted to point out the best practice and supported way of performing an upgrade of an active/active ZFSSA, where both controllers are doing some of the work. These steps would not have helpped me for the above issue, but it's important to follow the correct proceedure when doing an upgrade. 1) Upload software to both controllers and wait for it to unpack 2) On controller "A" navigate to configuration/cluster and click "takeover" 3) Wait for controller "B" to finish restarting, then login to it, navigate to maintenance/system, and roll forward to the new software. 4) Wait for controller "B" to apply the update and finish rebooting 5) Login to controller "B", navigate to configuration/cluster and click "takeover" 6) Wait for controller "A" to finish restarting, then login to it, navigate to maintenance/system, and roll forward to the new software. 7) Wait for controller "A" to apply the update and finish rebooting 8) Login to controller "B", navigate to configuration/cluster and click "failback"

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• Why is 0 false?

  - by Morwenn

  This question may sound dumb, but why does 0 evaluates to false and any other [integer] value to true is most of programming languages? String comparison Since the question seems a little bit too simple, I will explain myself a little bit more: first of all, it may seem evident to any programmer, but why wouldn't there be a programming language - there may actually be, but not any I used - where 0 evaluates to true and all the other [integer] values to false? That one remark may seem random, but I have a few examples where it may have been a good idea. First of all, let's take the example of strings three-way comparison, I will take C's strcmp as example: any programmer trying C as his first language may be tempted to write the following code: if (strcmp(str1, str2)) { // Do something... } Since strcmp returns 0 which evaluates to false when the strings are equal, what the beginning programmer tried to do fails miserably and he generally does not understand why at first. Had 0 evaluated to true instead, this function could have been used in its most simple expression - the one above - when comparing for equality, and the proper checks for -1 and 1 would have been done only when needed. We would have considered the return type as bool (in our minds I mean) most of the time. Moreover, let's introduce a new type, sign, that just takes values -1, 0 and 1. That can be pretty handy. Imagine there is a spaceship operator in C++ and we want it for std::string (well, there already is the compare function, but spaceship operator is more fun). The declaration would currently be the following one: sign operator<=>(const std::string& lhs, const std::string& rhs); Had 0 been evaluated to true, the spaceship operator wouldn't even exist, and we could have declared operator== that way: sign operator==(const std::string& lhs, const std::string& rhs); This operator== would have handled three-way comparison at once, and could still be used to perform the following check while still being able to check which string is lexicographically superior to the other when needed: if (str1 == str2) { // Do something... } Old errors handling We now have exceptions, so this part only applies to the old languages where no such thing exist (C for example). If we look at C's standard library (and POSIX one too), we can see for sure that maaaaany functions return 0 when successful and any integer otherwise. I have sadly seen some people do this kind of things: #define TRUE 0 // ... if (some_function() == TRUE) { // Here, TRUE would mean success... // Do something } If we think about how we think in programming, we often have the following reasoning pattern: Do something Did it work? Yes -> That's ok, one case to handle No -> Why? Many cases to handle If we think about it again, it would have made sense to put the only neutral value, 0, to yes (and that's how C's functions work), while all the other values can be there to solve the many cases of the no. However, in all the programming languages I know (except maybe some experimental esotheric languages), that yes evaluates to false in an if condition, while all the no cases evaluate to true. There are many situations when "it works" represents one case while "it does not work" represents many probable causes. If we think about it that way, having 0 evaluate to true and the rest to false would have made much more sense. Conclusion My conclusion is essentially my original question: why did we design languages where 0 is false and the other values are true, taking in account my few examples above and maybe some more I did not think of? Follow-up: It's nice to see there are many answers with many ideas and as many possible reasons for it to be like that. I love how passionate you seem to be about it. I originaly asked this question out of boredom, but since you seem so passionate, I decided to go a little further and ask about the rationale behind the Boolean choice for 0 and 1 on Math.SE :)

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• Error while validating HTML "document type does not allow element "li" here; missing one of "ul", "o

  - by brumila

  Hey! So I'm trying to code something on wordpress for the first time but the validator doesn't seem to like me. Look at the error I got while validating: Line 87, Column 33: document type does not allow element "li" here; missing one of "ul", "ol", "menu", "dir" start-tag I've searched everywhere, I'm not aware of any missing or misplaced li or ul tags can someone help me out on this one? <!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"> <head profile="http://gmpg.org/xfn/11"> <title> Blog</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <meta name="generator" content="WordPress 2.9.2" /> <!-- leave this for stats please --> <link rel="stylesheet" href="http://localhost/wordpress/wp-content/themes/cmc-milagro/style.css" type="text/css" media="screen" /> <link rel="alternate" type="application/rss+xml" title="RSS 2.0" href="http://localhost/wordpress/?feed=rss2" /> <link rel="alternate" type="text/xml" title="RSS .92" href="http://localhost/wordpress/?feed=rss" /> <link rel="alternate" type="application/atom+xml" title="Atom 0.3" href="http://localhost/wordpress/?feed=atom" /> <link rel="pingback" href="http://localhost/wordpress/xmlrpc.php" /> <link rel='archives' title='March 2010' href='http://localhost/wordpress/?m=201003' /> <link rel="EditURI" type="application/rsd+xml" title="RSD" href="http://localhost/wordpress/xmlrpc.php?rsd" /> <link rel="wlwmanifest" type="application/wlwmanifest+xml" href="http://localhost/wordpress/wp-includes/wlwmanifest.xml" /> <link rel='index' title='Blog' href='http://localhost/wordpress' /> <meta name="generator" content="WordPress 2.9.2" /> </head> <body> <div> <h1><a href="http://localhost/wordpress"> Blog</a> </h1> Just another WordPress weblog</div> <div id="container"> <h2><a href="http://localhost/wordpress/?p=8"> Teste Post 3 </a></h2> <div class="post" id="post-8"> <div class="entry"> <p>Aliquam erat volutpat. Fusce in nibh elit. Morbi lorem urna, viverra sed blandit eget, mattis venenatis felis. Maecenas viverra pellentesque justo, vel tincidunt massa semper sit amet. Vestibulum rhoncus purus in mauris fermentum ut aliquet augue semper.</p> <p class="postmetadata"> Filed under&#58; <a href="http://localhost/wordpress/?cat=1" title="View all posts in Uncategorized" rel="category">Uncategorized</a> by admin <br /> <a href="http://localhost/wordpress/?p=8#respond" title="Comment on Teste Post 3">No Comments &#187;</a> &#124; <a class="post-edit-link" href="http://localhost/wordpress/wp-admin/post.php?action=edit&amp;post=8" title="Edit post">Edit</a> </p> </div> </div> <h2><a href="http://localhost/wordpress/?p=5"> Teste Post 2 </a></h2> <div class="post" id="post-5"> <div class="entry"> <p>Aliquam erat volutpat. Fusce in nibh elit. Morbi lorem urna, viverra sed blandit eget, mattis venenatis felis. Maecenas viverra pellentesque justo, vel tincidunt massa semper sit amet. Vestibulum rhoncus purus in mauris fermentum ut aliquet augue semper. Duis orci metus, cursus ac tempor eget, faucibus vel elit. Sed rutrum mollis posuere. Maecenas luctus commodo augue vel fringilla. Nunc enim lacus, varius nec tempor sed, congue vel elit. Suspendisse urna ligula, pharetra ac malesuada quis, scelerisque eget justo.</p> <p class="postmetadata"> Filed under&#58; <a href="http://localhost/wordpress/?cat=1" title="View all posts in Uncategorized" rel="category">Uncategorized</a> by admin <br /> <a href="http://localhost/wordpress/?p=5#respond" title="Comment on Teste Post 2">No Comments &#187;</a> &#124; <a class="post-edit-link" href="http://localhost/wordpress/wp-admin/post.php?action=edit&amp;post=5" title="Edit post">Edit</a> </p> </div> </div> <h2><a href="http://localhost/wordpress/?p=3"> Teste Post 1 </a></h2> <div class="post" id="post-3"> <div class="entry"> <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Etiam ut mattis elit. In sed nulla lobortis dolor pellentesque fringilla at eget ipsum. Proin pellentesque vehicula ultricies. Phasellus velit nunc, tempus nec scelerisque vel, euismod pellentesque diam. Vivamus consectetur, sapien sit amet rhoncus porta, sapien nisl imperdiet diam, dapibus placerat sem ante condimentum nisl. Nulla facilisi. Mauris eu turpis mauris. Nunc at turpis elit, et mattis purus. Proin varius, nunc rhoncus consectetur dignissim, lacus augue accumsan sem, nec pretium magna est a massa. Duis eu justo arcu. Curabitur diam ligula, semper non blandit ut, sodales ac dui.</p> <p class="postmetadata"> Filed under&#58; <a href="http://localhost/wordpress/?cat=1" title="View all posts in Uncategorized" rel="category">Uncategorized</a> by admin <br /> <a href="http://localhost/wordpress/?p=3#respond" title="Comment on Teste Post 1">No Comments &#187;</a> &#124; <a class="post-edit-link" href="http://localhost/wordpress/wp-admin/post.php?action=edit&amp;post=3" title="Edit post">Edit</a> </p> </div> </div> <h2><a href="http://localhost/wordpress/?p=1"> Hello world! </a></h2> <div class="post" id="post-1"> <div class="entry"> <p>Welcome to WordPress. This is your first post. Edit or delete it, then start blogging!</p> <p class="postmetadata"> Filed under&#58; <a href="http://localhost/wordpress/?cat=1" title="View all posts in Uncategorized" rel="category">Uncategorized</a> by admin <br /> <a href="http://localhost/wordpress/?p=1#comments" title="Comment on Hello world!">1 Comment &#187;</a> &#124; <a class="post-edit-link" href="http://localhost/wordpress/wp-admin/post.php?action=edit&amp;post=1" title="Edit post">Edit</a> </p> </div> </div> <div class="navigation"> </div> </div> <div class="sidebar"> <ul> <li id="search"> <form method="get" id="searchform" action="http://localhost/wordpress/"> <div> <input type="text" value="" name="s" id="s" size="15" /><br /> <input type="submit" id="searchsubmit" value="Search" /> </div> </form> <li class="pagenav"><h2>Pages</h2><ul><li class="page_item page-item-2"><a href="http://localhost/wordpress/?page_id=2" title="About">About</a></li> </ul></li> </li> <li> <h2> Categories </h2> <ul> <li class="cat-item cat-item-1"><a href="http://localhost/wordpress/?cat=1" title="View all posts filed under Uncategorized">Uncategorized</a> (4) </li> </ul> </li> <li> <h2> Archives </h2> <ul> <li><a href='http://localhost/wordpress/?m=201003' title='March 2010'>March 2010</a></li> </ul> </li> <li id="linkcat-2" class="linkcat"><h2>Blogroll</h2> <ul> <li><a href="http://wordpress.org/development/">Development Blog</a></li> <li><a href="http://codex.wordpress.org/">Documentation</a></li> <li><a href="http://wordpress.org/extend/plugins/">Plugins</a></li> <li><a href="http://wordpress.org/extend/ideas/">Suggest Ideas</a></li> <li><a href="http://wordpress.org/support/">Support Forum</a></li> <li><a href="http://wordpress.org/extend/themes/">Themes</a></li> <li><a href="http://planet.wordpress.org/">WordPress Planet</a></li> </ul> </li> <li> <h2> Meta </h2> <ul> <li><a href="http://localhost/wordpress/wp-admin/">Site Admin</a></li> <li> <a href="http://localhost/wordpress/wp-login.php?action=logout&amp;_wpnonce=ee45c3c988">Log out</a> </li> </ul> </li> </ul> </div> <div id="footer"> <p> Copyright &#169; 2010 Blog</p> </div> </body> </html>

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• `svn checkout` on the SVN server causes the repo to break with a 301 error

  - by Phillip Oldham

  We have an nginx server which proxies to a standard set-up of Apache+SVN. The nginx set-up is a very simple proxy: server { server_name svn.ourdomain.tld; location / { proxy_pass http://localhost:8080; } } Apache is set-up as follows: <Location /> DAV svn SVNParentPath /var/svn AuthType Basic AuthName "Authentication Required" AuthUserFile /var/svn/.auth Require valid-user </Location> ...which allows us to access repositories using something like http://svn.ourdomain.tld/repo. We've been running this set-up now for about 2 years without issue. Recently we've found that we need to check out one of the repositories onto the server itself, however whenever we do so it seems to break the repo. From that point on, it will only respond with a 301 Moved Permanently error. We've tried: svn co file:///path/to/repo svn co svn://localhost/repo svn co svn://svn.ourdomain.tld/repo svn co svn+ssh://localhost/repo svn co svn+ssh://svn.ourdomain.tld/repo svn co http://localhost/repo svn co http://svn.ourdomain.tld/repo Also tried bypassing nginx, and get the same error: svn co http://localhost:8080/repo svn co http://svn.ourdomain.tld:8080/repo Checking out from a different machine works as expected until we attempt to check out on the server, after that it refuses with the same 301 error. What is more confusing is that this repository server also hosts our HudsonCI server, which can pulls and builds our projects hourly. This leads us to suspect that it's the svn client which is causing an error in communication. Its also very confusing that removing then re-creating the repo using svnadmin doesn't reset the error - the repo is still unavailable even though it's "new"! Restarting apache and subversion (svnserve) has no effect on this, or the original error. Version information: OS: 64-bit CentOS 4.2, 2.6.27 kernel svn client: 1.4.2 (same for both server and remote clients) svn server: 1.4.2 httpd: 2.2.3 UPDATE: This also happens with svn export when run on the repo server. Ran from any other box/client, there isn't a problem. Here's the workflow, to help clarify the error: [~repo-server~]# svnadmin create {repo}; chown -Rf www:www {repo} [remote-client]# svn checkout http://svn.ourdomain.tld/repo [remote-client]# svn add file; svn ci -m '' [~repo-server~]# cd /var/www; svn export file:///path/to/repo/trunk ourproject [remote-client]# svn update fails with 301 error I can also confirm that the hostname of the box doesn't have an effect here, which is very odd: whether or not svn.ourdomain.tld is added to /etc/hosts it still breaks - we thought it could be an issue with localhost routing, but that doesn't seem to be the case. Are we missing something in the documentation which states you can't checkout a repo when the server is on the same box? How can we stop the repos becoming corrupt when we checkout locally?

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• wmi error - dcom_create_object

  - by purpletonic

  I'm trying to connect to a remote windows machine from linux command line, but I'm getting an error. Here's the command I'm running: wmic -U 'domain.com/admin%password' //machine "Select Name from Win32_Service" The error I'm getting is as follows: ERROR: dcom_create_object. ERROR: Login to remote object. NTSTATUS: NT_STATUS_IO_TIMEOUT - NT_STATUS_IO_TIMEOUT Could anyone help me understand this. I've connected to the windows box with the credentials supplied, and wmi seems to be functioning correctly. What else could be causing this?

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• ltsp-built-client error

  - by sat

  I am facing some issues while building a thin client using the ltsp-build-client, it says an error. Error is: I: Retrieving Release E: Failed getting release file file://root/ISO/ubuntu-12.04.1-desktop-i386.iso/dists/squeeze/Release error: LTSP client installation ended abnormally My Command is: ltsp-build-client --mirror file://root/ISO/ubuntu-12.04.1-desktop-i386.iso --security-mirror none --accept-unsigned-packages I am referring this URL http://wiki.debian.org/LTSP/Howto. How to solve this error?

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• Disabling the Squid Error pages

  - by Nicholas Smith

  I've just started looking at using Squid for a project and can't seem to see an easy way of disabling the Squid error pages (e.g. "Name Error: The domain name does not exist"). We use a custom browser which handles that scenario in our way, so the Squid error pages are overriding our custom logic. Is it possible to set them too 'off'? I've been through the .conf and I've found where the error pages are stored, but no real options to disable them.

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• How to log error queries in mysql?

  - by Kaizoku

  I know that there is general_log that logs all queries, but I want to find out which query has an error, and get the error message. I have tried running an error query on purpose, but it logs as a normal query and doesn't report it with error. Any ideas?

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• Restart browser on error

  - by billfredtom

  Is there a way to restart a browser (Internet Explorer, Firefox, etc) automatically upon receiving an error such as a DNS error or Page not found? Background: It is for a web based signage application that has intermittent network drop outs, therefore if there's no internet, and the sign tries to go to the next page, an error occurs on browser, and we get one big ugly sign. We need a way to either restart the browser, or customise displayed error messages to use javascript to try redirection to the live sign again.

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• How to log error queries in mysql?

  - by Kaizoku

  I know that there is general_log that logs all queries, but I want to find out which query has an error, and get the error message. I have tried running an error query on purpose, but it logs as a normal query and doesn't report it with error. Any ideas?

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• Rsync over ssh: "ERROR: module is read only" suddenly appeared

  - by user978548

  I've used from some time rsync/ssh to backup my shared host contents to my personal Synology NAS (212j for that matter), and it worked quite well. For information, I use a password-less ssh connection. 3 days ago, I updated my NAS software and since (or at least I believe it's since that), the backup won't work anymore. I get the following error on the host: rsync: writefd_unbuffered failed to write 4 bytes to socket [sender]: Broken pipe (32) ERROR: module is read only ..which I do not understand. beside that nothing changed that I know of in both source and destination that can be related to rsync or ssh, I did check a few things and all seems to be alright: I can still connect through ssh from the host to my NAS with the good user, so ssh stuff like keys haven't changed. I also have the correct file permissions on the NAS (I checked, and also tried to create files, directories, .. with the user used by rsync through ssh). I read here and there that the error means that I have to ensure that my rsyncd.conf have the right read only = no in it, but as far as I know, I never used rsyncd as well as I never configured anything for it and until now it worked like a charm.. I use the following command to do the backup: rsync -ab --recursive \ --files-from="$FILES_FROM" \ --backup-dir=backup_$SUFFIX \ --delete \ --filter='protect backup_*' \ $WDIRECTORY/ \ remote_backup:$REMOTE_BACKUP/ So I'm stuck and really can't figure out what happened. Edit: As suggested in comments, I also tried passing commands to ssh (but not from inside a ssh session), that worked as expected, and also tried a single rsync command, which didnt worked, failing just like the complete backup command. (sharedHost):hostuser:~ > touch test.txt (sharedHost):hostuser:~ > rsync test.txt remote_backup:backups/test.txt ERROR: module is read only rsync error: syntax or usage error (code 1) at main.c(1034) [Receiver=3.0.8] rsync: connection unexpectedly closed (9 bytes received so far) [sender] rsync error: error in rsync protocol data stream (code 12) at io.c(601) [sender=3.0.7] and (sharedHost):hostuser:~ > ssh remote_backup 'touch /abs_path_to_backups/backups/test2.txt && echo "ProoF" > /abs_path_to_backups/backups/test2.txt' (sharedHost):hostuser:~ > ssh remote_backup 'cat /abs_path_to_backups/backups/test2.txt' ProoF

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• Webcam error (libv4lconvert) while capturing VIDEO

  - by shadyabhi

  I get the following when I capture images using my web-cam.. libv4lconvert: Error decompressing JPEG: unknown huffman code: 0000ffff libv4lconvert: Error decompressing JPEG: unknown huffman code: 0000ffff libv4lconvert: Error decompressing JPEG: unknown huffman code: 0000ffff ...(same error repeating) ... I also had issue that my camera was not getting detected in ubuntu. So, in order to run an application that uses the webcam, I have to run a command like LD_PRELOAD=/usr/lib/libv4l/v4l1compat.so ./6dofhand Whats causing these errors?

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• Windows 2003/IIS6 - Unexpected Error: C0000005

  - by Chirans

  Our event logs are full of these errors Unexpected error. A trappable error (C0000005) occurred in an external object. The script cannot continue running. We have tried in various ways but could not stop this error. After continuous errors, the IIS hangs up. We are also getting another error, Warning: IIS log failed to write entry. Please help me with the solution.

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• Internal Server Error on HTTPS SSL URL

  - by spike5792

  I am running cPanel/WHM on Apache server and have just installed an SSL certificate for a single domain. Domain/server is on a fixed dedicated IP address. I'm given the 'successfully installed' message when installing the SSL certificate, however when trying to visit the domain using https, the 500 Internal Server Error message appears: The server encountered an internal error or misconfiguration and was unable to complete your request. Additionally, a 500 Internal Server Error error was encountered while trying to use an ErrorDocument to handle the request.

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• NTFS.SYS error at boot in Win XP

  - by petergrf

  I am using Windows XP and this morning it didn't boot, it showed an error on "Windows/system32/config/SYSTEM" so I connected the hd to another pc, rename that file and then copy the one in Windows/Repair. And now it shows the error cannot find or corrupted "ntfs.sys". I tried copying ntfs.sys from the windows installation cd but still get the same error, also tried "EXPAND :\i836\ntoskrnl.exe ( and ntkrnlpa.exe ) :\Windows\System32" but the error persist. What other fixes can I try?

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• How to organize the work when project needs to be re-implemented due to poor code quality?

  - by Dmitriy Nagirnyak

  Hi, I have joined a very small where one main developer has been buiding the web app (.NET 4.0) during ~6 months. The project should be delivered within next 2 months. After first look at the code I can say that I would never allow it to go to production (things like catch { }, not tests at all with WebForms etc). So the code quality is incredibly low. My task is to improve that and still deliver the solution. So I plan to start with unit testing and MVC2 reimplementing most of the functionality (though using some of the existing code). I estimate that I will need about 6 weeks to catch up with the current progress and be on te same functionality level as the application will be in 6 months. The problem is that the main developer who has been working on the project does not seem to be very 'professional' and skillful (he seems to be really starting in IT and many basic things are unknown to him). It will take significant amount of time and effort to educate him how to do the proper testing, development and apply some patterns. I am ready to take responsibility for the reimplemnting the application but at the same time I don't want the main developer to be on idle but as he won't be able to significantly contribute to the better-world project at this stage I am not sure what would the best way to keep productivity high for both of us. Currently I think following solution is good enough: He proceeds doing what he does until I will catch up with him and then start working on a new project together. The problem is that of course this approach is not very productive as one developer will do better-world project while the other will proceed with what he did, effectively doing similar tasks. Can you suggest how we could better organise the work together in order to be most efficient for the overall project? Thanks, Dmitriy.

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• Is there a way to avoid spaghetti code over the years?

  - by Yoni Roit

  I've had several programming jobs. Each one with 20-50 developers, project going on for 3-5 years. Every time it's the same. Some programmers are bright, some are average. Everyone has their CS degree, everyone read design patterns. Intentions are good, people are trying hard to write good code but still after a couple of years the code turns into spaghetti. Changes in module A suddenly break module B. There are always these parts of code that no one can understand except for the person who wrote it. Changing infrastructure is impossible and backwards compatibility issues prevent good features to get in. Half of the time you just want to rewrite everything from scratch. And people more experienced than me treat this as normal. Is it? Does it have to be? What can I do to avoid this or should I accept it as a fact of life? Edit: Guys, I am impressed with the amount and quality of responses here. This site and its community rock!

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