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• Throwing an exception while handling an exception

  - by FredOverflow

  If a destructor throws in C++ during stack unwinding caused by an exception, the program terminates. (That's why destructors should never throw in C++.) If a finally block is entered in Java because of an exception in the corresponding try block and that finally block throws another exception, the first exception is silently swallowed. This question crossed my mind: Could a programming language handle multiple exceptions being thrown at the same time? Would that be useful? Have you ever missed that ability? Is there a language that already supports this? Is there any experience with such an approach? Any thoughts?

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• Jruby embedded modules and classes.

  - by James Moore

  Hey, I have a ruby file as follows: module Example class Myclass def t_st "Hello World!" end end end now if this was just a class I would be able to use the following java code: ScriptEngine jruby = new ScriptEngineManager().getEngineByName("jruby"); jruby.eval(new BufferedReader(new FileReader("example.rb"))); Object example = jruby.eval("myclass.new"); However, this class rests inside a module. Calling the same code as above produces the error: Exception in thread "main" org.jruby.embed.EvalFailedException: uninitialized constant myclass In addition, calling: Object example = jruby.eval("Example"); The module returns no error. So one would assume this follows the format for Ruby. Object example = jruby.eval("Example::myclass.new"); Again however, I get the same error as before. Can anyone help? As there is little documentation on JRuby? Thanks

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• Debugging in Maven?

  - by aduric

  Is it possible to launch a debugger such as jdb from maven? I have a pom.xml file that compiles the project successfully. However, the program hangs somewhere and I would really like to launch jdb or an equivalent debugger to see what's happening. I compile using mvn compile and launch using: mvn exec:java -Dexec.mainClass="com.mycompany.app.App" I was expecting something like: mvn exec:jdb -Dexec.mainClass="com.mycompany.app.App" to launch the debugger but, as usual, my expectations are incongruent with maven's philosophy. Also, I couldn't find any documentation (on Maven's website or google) to describe how debugging works. I suspect that I have to use some plugin.

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• Jmeter Exception response code :000 ,response message:Read timed out,for Java Web service?

  - by vipin k.

  I am testing a java web service(jax-ws),but whenever i am running the test i am getting response code as response message:Read timed out . And at tomcat serevr side i am getting exception : SEVERE: caught throwable ClientAbortException: java.net.SocketException: Connection reset by peer: socket write error at org.apache.catalina.connector.OutputBuffer.realWriteBytes(OutputBuffer.java:358) at org.apache.tomcat.util.buf.ByteChunk.append(ByteChunk.java:354) at org.apache.catalina.connector.OutputBuffer.writeBytes(OutputBuffer.java:381) at org.apache.catalina.connector.OutputBuffer.write(OutputBuffer.java:370) at org.apache.catalina.connector.CoyoteOutputStream.write(CoyoteOutputStream.java:89) I found out that Read timed out exception may occur because of big size of SOAP response. But i am clue less because same web service i can access form an application.

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• Set saxon DocumentBuilderFactoryImpl features using javax.xml interface.

  - by Mycol

  Here what I have. System.setProperty( "javax.xml.parsers.DocumentBuilderFactory", "net.sf.saxon.dom.DocumentBuilderFactoryImpl"); DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance(); //factory.setNamespaceAware(true); //factory.setIgnoringElementContentWhitespace(true); //factory.setValidating(false); //factory.setIgnoringComments(true); DocumentBuilder builder = factory.newDocumentBuilder(); Document xml = builder.parse(file.getAbsolutePath()); Saxon parser doesn't allow me to set the commentet properties: javax.xml.parsers.ParserConfigurationException: Saxon parser does not allow whitespace in element content to be ignored at net.sf.saxon.dom.DocumentBuilderFactoryImpl.newDocumentBuilder(DocumentBuilderFactoryImpl.java:98) I thought i could set those features in other way, like factory.setAttribute(string, bool) factory.setFeature(string, bool) But I can't find anywhere the values for "string". I tried net.sf.saxon.FeatureKeys whitout success. My question is: what's the correct way to do that?

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• ByteBuffer recycling class

  - by Chris Dennett

  Hi everyone, I'm wonder how I'd code up a ByteBuffer recycling class that can get me a ByteBuffer which is at least as big as the specified length, and which can lock up ByteBuffer objects in use to prevent their use while they are being used by my code. This would prevent re-construction of DirectByteBuffers and such over and over, instead using existing ones. Is there an existing Java library which can do this very effectively? I know Javolution can work with object recycling, but does that extend to the ByteBuffer class in this context with the requirements set out? Cheers, Chris

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• Displaying a pdf file located on a http server from mobile phone

  - by JCasso

  I have some pdf files located on a http server: Like: http://domain.com/files/file1.pdf http://domain.com/files/file1.pdf http://domain.com/files/file1.pdf I need to display these files on a mobile application using java me. I tried to display them by opening Google Docs Viewer with platformRequest. However it seems Google Docs Viewer uses ajax and many mobile browsers does not support it. Is there an alternative for "Google Docs Viewer" for mobile devices ? Or is there a better solution for this problem ?

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• Android: howto parse URL String with spaces to URI object?

  - by Mannaz

  I have a string representing an URL containing spaces and want to convert it to an URI object. If is simple try to do String myString = "http://myhost.com/media/mp3s/9/Agenda of swine - 13. Persecution Ascension_ leave nothing standing.mp3"; URI myUri = new URI(myString); it gives me java.net.URISyntaxException: Illegal character in path at index X where index X is the position of the first space in the URL string. How can i parse myStringinto a URI object?

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• Metaprograming - self explanatory code - tutorials, articles, books

  - by elena

  Hello everybody, I am looking into improving my programming skils (actually I try to do my best to suck less each year, as our Jeff Atwood put it), so I was thinking into reading stuff about metaprogramming and self explanatory code. I am looking for something like an idiot's guide to this (free books for download, online resources). Also I want more than your average wiki page and also something language agnostic or preferably with Java examples. Do you know of such resources that will allow to efficiently put all of it into prectice (I know experience has a lot to say in all of this but i kind of want to build experience avoiding the flow bad decitions - experience - good decitions)? Thank you!

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• In a distributed environment, how can I configure log4j to log to different files for each JVM insta

  - by Renan Mozone

  My application runs on IBM WebSphere 6.1 Network Deployment. The application have several JSP files and Java classes. Today each host have only one JVM instance but my intention is to start another instance on each host. How can I configure log4j to log to different files for each JVM instance in the same host? I thought of using variable substitution on log4j XML configuration file but it only works with system properties. So, it is safe and recommended to set a custom system property just to store the JVM name? Anyone knows another strategy to achieve this in a 'elegant' way?

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• Jython project in Eclipse can't find the Jython library, but works in an identical project

  - by Rob Lourens

  I have two projects in Eclipse with Java and Python code, using Jython. Also I'm using PyDev. One project can import and use the xml module just fine, and the other gives the error ImportError: No module named xml. As far as I can tell, all the project properties are set identically. The working project was created from scratch and the other comes from code checked out of an svn repository and put into a new project. What could be the difference?

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• ORM in the realworld

  - by josh

  I am begining a new project that i think will last for some years. Am in the point of deciding the ORM framework to use (or whether to use one at all). Can anyone with experience tell me whether orm frameworks are used in realworld applications. The problem i have in mind is this: The orm tool will generate for me tables and columns etc as i create and modify my entities. However, after the project has gone live and is in production, certain database changes will not be possible. Can this hinder the advancement of the project. If i had used a framework like ibatis for example, i know i would only need to adjust the sql statements based on the database changes. Can someone tell me whether ORM tools have survived the live environment. At my office, we use java based ERP that was done long ago and it was never done using any ORM framework. Regards. Josh

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• What are some interesting fringe programming topics that might have hands-on training?

  - by hal10001

  Whenever training topic questions are asked, the answers are fairly typical, and involve a pretty limited subset of topics like OO, design patterns, algorithms, web services, SQL, etc., but I wonder if there are some fringe topics that are still applicable to the programming field and would give me a more rounded approach to development. When I think of "fringe", I think of 2600: The Hacker Quarterly articles that discuss how to use real world (sometimes obscure) exploits, or something like Maker Faire that demonstrates embedded systems programming using Arduino. I have around $1500-2000 to spend, and my job entails Java technologies, but that does not limit my options.

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• JRuby Slick CanvasGameContainer using too much heap memory

  - by Jwosty

  I'm using Java's Slick library (great, by the way) just fine from JRuby. To start a game, I use AppGameContainer which works completely fine and as expected, but if I try to use CanvasGameContainer instead (I want a resizable window and Slick uses an old version of LWJGL that doesn't support this directly) it throws this error: Fri Jun 01 10:22:07 MDT 2012 INFO:Slick Build #274 Error: Your application used more stack memory than the safety cap of 2048K. Specify -J-Xss####k to increase it (#### = cap size in KB). Specify -w for full StackOverflowError stack trace I've tried increasing the heap size until my computer can't allocate any more memory, but to no avail. The CanvasGameContainer uses an awt window to display, which is resizable. Any ideas on why this is happening and/or how to fix this?

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• How do I get google guice to inject a custom logger, say a commons-logging or log4j logger

  - by Miguel Silva

  Google guice has a built-in logger binding (http://code.google.com/p/google-guice/wiki/BuiltInBindings). But what if I want to use a commons-logging or log4j logger? Can I get guice to inject a Log created by LogFactory.getLog(CLASS.class) But having the same behavior as in built-in binding: The binding automatically sets the logger's name to the name of the class into which the Logger is being injected.. Does it even makes sense? Or shout I simply use the built-in java Logger? Or just use commons-logging without injections?

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• string matching algorithms used by lucene

  - by iamrohitbanga

  i want to know the string matching algorithms used by Apache Lucene. i have been going through the index file format used by lucene given here. it seems that lucene stores all words occurring in the text as is with their frequency of occurrence in each document. but as far as i know that for efficient string matching it would need to preprocess the words occurring in the Documents. example: search for "iamrohitbanga is a user of stackoverflow" (use fuzzy matching) in some documents. it is possible that there is a document containing the string "rohit banga" to find that the substrings rohit and banga are present in the search string, it would use some efficient substring matching. i want to know which algorithm it is. also if it does some preprocessing which function call in the java api triggers it.

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• Sort ArrayList of custom Objects by property

  - by Samuel

  Hello World!! :D I had a question which is pretty easy if you know the answer I guess. I read about sorting ArrayLists using a Comparator but somehow in all of the examples people used compareTo which according to some research is a method working on Strings... I wanted to sort an ArrayList of custom objects by one of their properties: a Date object (getStartDay()). Normally I compare them by item1.getStartDate().before(item2.getStartDate()) so I was wondering whether I could write something like: public class customComparator { public boolean compare(Object object1, Object object2) { return object1.getStartDate().before(object2.getStartDate()); } } public class randomName { ... Collections.sort(Database.arrayList, new customComparator); ... } I just started with Java so please forgive my ignorance :) Thanks in advance!! -Samuel

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• Unit testing several implementation of the same trait/interface

  - by paradigmatic

  I program mostly in scala and java, using scalatest in scala and junit for unit testing. I would like to apply the very same tests to several implementations of the same interface/trait. The idea is to verify that the interface contract is enforced and to check Liskov substitution principle. For instance, when testing implementations of lists, tests could include: An instance should be empty, if and only if and only if it has zero size. After calling clear, the size sould be zero. Adding an element in the middle of a list, will increment by one the index of rhs elements. etc. What are the best practices ?

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• Retrieving WSDL file from secure service

  - by Anonimo

  I have a Web Service developed with JAX-WS. I have secured the web service with BASIC authentication configured in Tomcat. When I try to access the web service using a Java client, I first need to create the port, and then specify the credentials, as follows: CustomerServiceClient customerServiceClient = new CustomerServiceBottomUpService(); //1 CustomerService customer = customerServiceClient.getCustomerServicePort(); //2 Map<String, Object> context = ((BindingProvider) customer).getRequestContext(); //3 context.put(BindingProvider.USERNAME_PROPERTY, "kermit"); //4 context.put(BindingProvider.PASSWORD_PROPERTY, "thefrog"); //5 The problem I have is that, after line 1, I get an Authorization error (HTTP 401) as I obviously haven't provided the server with the credentials yet. I am creating the client artifacts from a server WSDL, hence the authentication problem when creating the service, and don't want my clients to store the WSDL locally as it's just annoying for them. How can I get around this problem?

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• Tricky compiler behavior

  - by Neeraj

  Simple java code snippet. It has three classes. After compiling the code please delete A.class and then execute the code. Code still runs, why its not checking whether the byte code of A exists or not? class A { static { System.out.println("In the class A"); } public A() { } } class B { private A a = null; static { System.out.println("In the class B"); } public B() { a = new A(); } } public class ExampleLinkage { static { System.out.println("In the class A"); } public ExampleLinkage(String str) { } public static void main(String args[]) { try { System.out.println("In the main method of ExampleLinkage"); Class.forName("com.bt.rtti.B"); } catch(Exception e) { e.printStackTrace(); } } }

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• J2SE Proxy Authentication

  - by Alan

  We use 2 SIMILAR Microsoft ISA Proxy Server 2003 to connect to internet. Each Proxy has different Login style, as below : Server-1 : nt-domain\alan Server-2 : [email protected] Logon in IE, Firefox and my Phonecell via Wifi all are fine. But, a problem appears when we run a java application J2SE Ver 4, 5 and 6, where it needs internet authentication. Logon to Server-2 is OK, but FAIL for Server-2 (style : [email protected]). Note : Both proxy seen using Windows authentication, type : negotiate NTLM Appreceate if you can help or for any suggest. Thank you, Alan L

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• Building big, immutable objects without using constructors having long parameter lists

  - by Malax

  Hi StackOverflow! I have some big (more than 3 fields) Objects which can and should be immutable. Every time I run into that case i tend to create constructor abominations with long parameter lists. It doesn't feel right, is hard to use and readability suffers. It is even worse if the fields are some sort of collection type like lists. A simple addSibling(S s) would ease the object creation so much but renders the object mutable. What do you guys use in such cases? I'm on Scala and Java, but i think the problem is language agnostic as long as the language is object oriented. Solutions I can think of: "Constructor abominations with long parameter lists" The Builder Pattern Thanks for your input!

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• NullPointerException with CallableStatement.getResultSet()

  - by Raj

  Hello, I have a stored proc in SQL Server 2005, which looks like the following (simplified) CREATE PROCEDURE FOO @PARAMS AS BEGIN -- STEP 1: POPULATE tmp_table DECLARE @tmp_table TABLE (...) INSERT INTO @tmp_table SELECT * FROM BAR -- STEP 2: USE @tmp_table FOR FINAL SELECT SELECT abc, pqr FROM BAZ JOIN @tmp_table ON some_criteria END When I run this proc from SQL Server Management Studio, things work fine. However, when I call the same proc from a Java program, using something like: cs = connection.prepareCall("exec proc ?,"); cs.setParam(...); rs = cs.getResultSet(); // BOOM - Null! while(rs.next()) {...} // NPE! I fail to understand why the first result set returned is NULL. Can someone explain this to me? As a workaround, if I check cs.getMoreResults() and if true, try another getResultSet() - THIS time it returns the proper result set. Any pointers please? (I'm using JTDS drivers, if it matters) Thanks, Raj

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• Weird Mono compilation error

  - by nubela

  Hi, I am using IKVM to get SVNKit on a Mono project I'm working with, I have a class that implements an interface from SVNKit, and I can't compile: On windows and on .NET, everything compiles fine, just getting this on Mono. /home/nubela/Workspace/subsync/subsync/Core/Subversion/PropGetHandler.cs(22,22): Error CS0535: Subsync.Core.Subversion.PropGetHandler' does not implement interface member org.tmatesoft.svn.core.wc.ISVNPropertyHandler.__()' (CS0535) (subsync) I googled _() method, and it seems to be the initializer method for the base class in the Java library compiled from IKVM. I have no clue how to proceed now, any idea guys? :)

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• Is it professional to have funny looking logging messages

  - by JCH

  Hi, Recently I have joined a new project team where in the java application logs have logged messages in a non-formal way[can't think of suitable word]. here how they look :-) <message> for info messages :-| <message> for warn :-( <message> for error besides there's also ASCII art drawing , different one for each log when that particular service starts up or is killed .And there many more styles for certain application events. iam not sure if it has any significant overhead on the application or not. I would like to ask you folks if you come across such unique styles of logging messages or do you also practice any styles.what is your opinion about it. BR /jon

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