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  • Mysterious newInstance method

    - by songsungkyun
    First I show some code. library: axis.jar, dom4j.jar jdk1.5, windowsXP T.java import java.io.StringWriter; import org.apache.axis.utils.StringUtils; import org.dom4j.DocumentHelper; import org.dom4j.io.OutputFormat; import org.dom4j.io.XMLWriter; public class T { public T() { System.out.println("constructor"); } public void test() { System.out.println(StringUtils.unescapeNumericChar("1")); } public String getPrettyXML(String xml) throws Exception { System.out.println("getPrettyXML"); StringWriter sw = new StringWriter(); XMLWriter writer = null; try { OutputFormat format = OutputFormat.createPrettyPrint(); org.dom4j.Document document = DocumentHelper.parseText(xml); writer = new XMLWriter(sw, format); writer.write(document); } catch (Exception e) { throw e; } finally { if (writer != null) { try { writer.close(); } catch (Exception e) { } } } return sw.toString(); } public void a() { System.out.println("a"); } public static void main(String[] args) { new T().test(); } } T2.java public class T2 { public static void main(String[] args) throws Exception { System.out.println("T2"); T t = (T) Class.forName("T").newInstance(); } } Ok, here we go... run as (Of course, I'm run at the directory where T.class, T1.class is) java T2 as you can see, not exist class path. ==console== T2 constructor OK... Now delete throw e line at the catch block on the "getPrettyXML" method of T. Ok, here we go.. run one more time without classpath java T2 You can see below... ==console== T2 Exception in thread "main" java.lang.NoClassDefFoundError: org/dom4j/io/OutputFormat at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Unknown Source) at T2.main(T2.java:5) I know that it's not very important for my life or your life. But it's so mysterisou to me, and my all curiosity. thanks.. ^^

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  • Firefox engine library

    - by martin.malek
    Hi, I'm now using AxWebBrowser component to get DOM from web page and find used styles on each element. Unfortunatelly this is not working perfectly and some elements doesn't return correct data. I'm thinking about if it's possible to use engine from firefox? Is there some dll library I can use, navigate to the page and go throw DOM of the page?

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  • database transaction rollback processing in PHP

    - by user198729
    try { $con->beginTransaction(); $this->doSave($con); $con->commit(); } catch (Exception $e) { $con->rollBack(); throw $e; } The code above is quite standard an approach to deal with transactions, but my question is:what if $con->rollBack() also fails? It may cause db lock,right?If so,what's the perfect way to go?

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  • Data Annotations validation Built into model

    - by Josh
    I want to build an object model that automatically wires in validation when I attempt to save an object. I am using DataAnnotations for my validation, and it all works well, but I think my inheritance is whacked. I am looking here for some guidance on a better way to wire in my validation. So, to build in validation I have this interface public interface IValidatable { bool IsValid { get; } ValidationResponse ValidationResults { get; } void Validate(); } Then, I have a base class that all my objects inherit from. I did a class because I wanted to wire in the validation calls automatically. The issue is that the validation has to know the type of the class is it validating. So I use Generics like so. public class CoreObjectBase<T> : IValidatable where T : CoreObjectBase<T> { #region IValidatable Members public virtual bool IsValid { get { // First, check rules that always apply to this type var result = new Validator<T>().Validate((T)this); // return false if any violations occurred return !result.HasViolations; } } public virtual ValidationResponse ValidationResults { get { var result = new Validator<T>().Validate((T)this); return result; } } public virtual void Validate() { // First, check rules that always apply to this type var result = new Validator<T>().Validate((T)this); // throw error if any violations were detected if (result.HasViolations) throw new RulesException(result.Errors); } #endregion } So, I have this circular inheritance statement. My classes look like this then: public class MyClass : CoreObjectBase<MyClass> { } But the problem occurs when I have a more complicated model. Because I can only inherit from one class, when I have a situation where inheritance makes sense I believe the child classes won't have validation on their properties. public class Parent : CoreObjectBase<Parent> { //properties validated } public class Child : Parent { //properties not validated? } I haven't really tested the validation in these cases yet, but I am pretty sure that anything in child with a data annotation on it will not be automatically validated when I call Child.Validate(); due to the way the inheritance is configured. Is there a better way to do this?

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  • svn, how to downalod a file from the site 'tigris'

    - by Robin
    hi, sorry for maybe this is stupid question, I just want download source code form the link as follows: http://argouml.tigris.org/source/browse/argouml/trunk/src/ I try to use the command : svn checkout http://argouml.tigris.org/source/browse/argouml/trunk/ but it throw error : svn: OPTIONS of 'http://argouml.tigris.org/source/browse/argouml/trunk': 200 OK (http://argouml.tigris.org) I am strange that , how to checkout the source code from the url ? many thanks for your help ! Regards

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  • C++: Why does gcc prefer non-const over const when accessing operator[]?

    - by JonasW
    This question might be more appropriately asked regarding C++ in general, but as I am using gcc on linux that's the context. Consider the following program: #include <iostream> #include <map> #include <string> using namespace std; template <typename TKey, typename TValue> class Dictionary{ public: map<TKey, TValue> internal; TValue & operator[](TKey const & key) { cout << "operator[] with key " << key << " called " << endl; return internal[key]; } TValue const & operator[](TKey const & key) const { cout << "operator[] const with key " << key << " called " << endl; return internal.at(key); } }; int main(int argc, char* argv[]) { Dictionary<string, string> dict; dict["1"] = "one"; cout << "first one: " << dict["1"] << endl; return 0; } When executing the program, the output is: operator[] with key 1 called operator[] with key 1 called first one: one What I would like is to have the compiler choose the operator[]const method instead in the second call. The reason is that without having used dict["1"] before, the call to operator[] causes the internal map to create the data that does not exist, even if the only thing I wanted was to do some debugging output, which of course is a fatal application error. The behaviour I am looking for would be something like the C# index operator which has a get and a set operation and where you could throw an exception if the getter tries to access something that doesn't exist: class MyDictionary<TKey, TVal> { private Dictionary<TKey, TVal> dict = new Dictionary<TKey, TVal>(); public TVal this[TKey idx] { get { if(!dict.ContainsKey(idx)) throw KeyNotFoundException("..."); return dict[idx]; } set { dict[idx] = value; } } } Thus, I wonder why the gcc prefers the non-const call over the const call when non-const access is not required.

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  • force warning in java

    - by Dustin Getz
    I'd like a mechanism to throw a compile-time warning manually. I'm using it to flag unfinished code so I can't possibly forget about it later. @Deprecated is close but warns at caller site, not at creation site. I'm using eclipse. Something like #Warning in C#.

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  • C# 4: how to in-line detect for nulls?

    - by Dr. Zim
    In C# 4, wasn't there a short cut for checking for null values like so: if( myobject?.myproperty?.myotherproperty?.value != null ) The value would return null and not throw an exception. Anyone have a link to how to use it or at least the syntax?

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  • SwingWorker exceptions lost even when using wrapper classes

    - by Ti Strga
    I've been struggling with the usability problem of SwingWorker eating any exceptions thrown in the background task, for example, described on this SO thread. That thread gives a nice description of the problem, but doesn't discuss recovering the original exception. The applet I've been handed needs to propagate the exception upwards. But I haven't been able to even catch it. I'm using the SimpleSwingWorker wrapper class from this blog entry specifically to try and address this issue. It's a fairly small class but I'll repost it at the end here just for reference. The calling code looks broadly like try { // lots of code here to prepare data, finishing with SpecialDataHelper helper = new SpecialDataHelper(...stuff...); helper.execute(); } catch (Throwable e) { // used "Throwable" here in desperation to try and get // anything at all to match, including unchecked exceptions // // no luck, this code is never ever used :-( } The wrappers: class SpecialDataHelper extends SimpleSwingWorker { public SpecialDataHelper (SpecialData sd) { this.stuff = etc etc etc; } public Void doInBackground() throws Exception { OurCodeThatThrowsACheckedException(this.stuff); return null; } protected void done() { // called only when successful // never reached if there's an error } } The feature of SimpleSwingWorker is that the actual SwingWorker's done()/get() methods are automatically called. This, in theory, rethrows any exceptions that happened in the background. In practice, nothing is ever caught, and I don't even know why. The SimpleSwingWorker class, for reference, and with nothing elided for brevity: import java.util.concurrent.ExecutionException; import javax.swing.SwingWorker; /** * A drop-in replacement for SwingWorker<Void,Void> but will not silently * swallow exceptions during background execution. * * Taken from http://jonathangiles.net/blog/?p=341 with thanks. */ public abstract class SimpleSwingWorker { private final SwingWorker<Void,Void> worker = new SwingWorker<Void,Void>() { @Override protected Void doInBackground() throws Exception { SimpleSwingWorker.this.doInBackground(); return null; } @Override protected void done() { // Exceptions are lost unless get() is called on the // originating thread. We do so here. try { get(); } catch (final InterruptedException ex) { throw new RuntimeException(ex); } catch (final ExecutionException ex) { throw new RuntimeException(ex.getCause()); } SimpleSwingWorker.this.done(); } }; public SimpleSwingWorker() {} protected abstract Void doInBackground() throws Exception; protected abstract void done(); public void execute() { worker.execute(); } }

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  • compressing XML file

    - by Sathish
    HI I have an xml file with 500KB size which i need to send it to webservice, so i want to compress this data and send it to the webservice i have heard of some base24Encoding something... Can anyone throw more light on this Suppose if i use GZipStream how can i send the file to the webservice Thanks in Advance

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  • check that int array contains !=0 value using lambda

    - by netmajor
    hey, I have two-dimension array List<List<int>> boardArray How can I enumerate throw this array to check that it contains other value than 0 ? I think about boardArray.Contains and ForEach ,cause it return bool value but I don't have too much experience with lambda expression :/ Please help :)

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  • Access COMPORT 1 through three different applications.

    - by Khushi
    Hi I have an SMS Appliaction, which receives the messages through GPS Modem and revert back through GPS Modem. The Modem is using COM1. Now, i need two more appliactions which can send messages through the same GPS Modem. I tried making a webservice which can access the COM1 to send data, but when i try to connect through webService, it throw an error saying, 'COM1 is already occupied, Access denied.'. Can anybody help me to connect through the modem in above scenario. Khushi

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  • Xerces conflicts string.h

    - by Velthune
    Compiling my program I have this error: /usr/include/xercesc/util/Compilers/GCCDefs.hpp:133:60: error: declaration of ‘int strcasecmp(const char*, const char*)’ has a different exception specifier /usr/include/string.h:536:12: error: from previous declaration ‘int strcasecmp(const char*, const char*) throw ()’ make: *** [src/test/VFTImageMaterial.o] Error 1 Any idea about this conflict with string.h?

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  • How to handle error in this case? By Exceptions or boolean or something else

    - by TP
    I am trying to create a Response class in Java which has a method void setResponse(String response); Different response subclasses will have different requirements for the response. The string that is passed to the function is received from the user. What is the correct way of handling a wrong response? Should the function throw an exception like IllegalResponseException Should the function be declared like boolean setResponse(String response, String errorMsg) and return false if the response is wrong and set the error message to the appropriate value

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  • Class with proprties that haven't been set

    - by koumides
    Hello there, I am creating a class in C# which eventually will be part of a library that other uses can use. A user of this class has to set some properties and then use a public method to retrieve the results. What shall I do when a user calls the method without setting all the properties? Throw exception and expect the user to catch it? Thanks

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  • What happens inside the try block?

    - by dontWatchMyProfile
    Example: @try { // 1) do bad stuff that can throw an exception... // 2) do some more stuff // 3) ...and more... } @catch (NSException *e) { NSLog(@"Error: %@: %@", [e name], [e reason]); } If 1) throws an exception, is the block immediately canceled like a return in a function or a break in a loop? Or will 2) and 3) be processed no matter what happens in 1)?

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  • Best way to install web applications (e.g. Jira) on Unixes?

    - by gineer
    Can you throw some points on how it is a best way, best practice to install web application on Unixes? Like: where to place app and its bases and so for, how to configure to be secure and easy to backup, etc For example I know such suggestion -- to set uniq user for each app. App in question is Jira on FreeBSD, but more general suggestions are also welcomed.

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