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• Jetty: How to write to access logs

  - by mdemmitt

  Hi all, In my Java servlet code, I want to be able to programatically write to the jetty access log. I am aware that jetty will automatically log every incoming HTTP request to the access log. However, my servlet needs to occasionally append it's own line to the access log. Has anyone here done something similar? Thanks!

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• Create a dataset: extract features from text documents (TF-IDF)

  - by BigG

  I've to create a dataset from some text files, writing them as vectors of features. Something like this: doc1: 1,0.45 6,0.001 94,0.1 ... doc2: 3,0.5 98,0.2 ... ... each position of the vector represent a word, and the score is given by something like TF-IDF. Do you know some library/tool/whatever for this? (java is better)

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• No Android project type in Eclipse->File->New-Project

  - by Rubberman

  I am running CentOS 5.5 x86_64 with JDK 1.6, Eclipse Galileo, and the 0.9.7 ADT is installed; however, after installation, the Android project type is not available. I have checked in the installed packages list and it is installed. Anybody encounter this problem before? Could it be due to my use of the 64-bit java VM that is installed on my system?

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• What hack can I use to suppress an unused function warning?

  - by Yuval A

  Consider a private method which is called from JNI and not used otherwise, generating a compiler warning about an unused method: private void someMethodCalledOnlyFromJNI() { // WARNING: method is never used // .... } This is some legacy code in Java 1.4 - so no dice on @SuppressWarnings. What hack would you use to suppress this compiler warning?

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• MVC architecture example using JSF 2.0 and EJB 3?

  - by nebiros

  Somebody knows an example of this? an application made with JSF 2.0 and EJB 3? directory structure, etc, those kind of things, I’m trying to approach the best way to create a Java EE app using those technologies.

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• Why does this code sometimes throw a NullPointerException?

  - by Tiberiu Hajas

  Consider the following Java source: if( agents != null ) { for( Iterator iter = agents.keySet().iterator(); iter.hasNext(); ) { // Code that uses iter.next() ... // } } The agents is a HashMap. Why does the for statement sometimes throw a NullPointerException? Thank you.

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• What's the fundamental of computing? [closed]

  - by dani3lcara

  I’d like to know about the computer science. Is that a science or art ?Then what about the Information Technology ? What can be computed and What cannot be computed ? and I'd like to know about the Legal java code.

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• JVM hs_err.log not being generated on Linux

  - by halfwarp

  Hello, I'm currently having some issues with a Java application I'm developing. Namely the JVM is crashing with a segfault. I'm trying to locate the hs_err.log file which should contain some helpful info about the issue. However, I can't find this file. I've used find, locate, etc, and nothing. Any ideas on why the log file isn't being generated?

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• JSONDeserializer.use doesn't convert correctly

  - by user530846

  I'm trying to use flexjson to convert the following json string into a java object: {"inboundDataNotification": { "callbackData": "12345", "inboundData": { "message": "Hello World", "messageId": "mes1234" } }} Using the following method: import flexjson.JSONDeserializer; @RooJavaBean @RooToString @RooJson(fromJsonArrayMethod="", toJsonArrayMethod="", toJsonMethod="") public class InboundData { private String messageId; private String message; public static InboundSMSMessage fromJsonToInboundSMSMessage(String json) { return new JSONDeserializer<InboundSMSMessage>().use(null, InboundSMSMessage.class).deserialize(json); } } All fields are null after this method is invoked. Any ideas what to change here?

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• In 0-based indexing system, do people call the element at index 0 the "first" or the "zeroth" elemen

  - by polygenelubricants

  In Java/C++, for example, do you casually say that 'a' is the first character of "abc", or the zeroth? Do people say both and it's always going to be ambiguous, or is there an actual convention?

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• Dependency Injection: What's wrong with good old-fashioned refactoring?

  - by Chuck

  DI creates an extra layer of abstraction so that if your implementation class ever changes you can simply plug in a different class with the same interface. But why not simply refactor when you want to use a different implementation class? Other languages like Python and Ruby work fine this way. Why not Java?

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• Convert normal web service to wcf

  - by zachary

  I have a normal web service. Many java and .net users are accessing it. Can I update it to wcf without anyone having to change their code? Any tutorials?

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• JBoss 5.1.0 (JSF/Seam) cookies blowing up with accented characters

  - by user283680

  I cannot see this behavior in JBoss 4.2.3. If I try to call addCookie() on HttpServletResponse and my cookie value has accented characters in it (ex. ç) I get this exception: java.lang.IllegalArgumentException: Control character in cookie value, consider BASE64 encoding your value Does anyone know what change in JBoss 5.1.0 could be causing these problems?

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• examples of good concurrent programs meant to scale

  - by vishr

  I am looking for seminal and excellent examples of libraries and projects that emulate the good practices of the Java Concurrency in Practice book. The book is marvelous. However, I think supplementing this book reading with code reviews of projects and libraries that make use of the concurrency APIs effectively is necessary to drive the concepts into the brain. One good example of what I am looking for is https://code.google.com/p/concurrentlinkedhashmap/ Can folks help me with finding exemplary, well written code that use the concurrency api well?

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• Lucene unexpectedly gives different results when operator of search words changes

  - by Lars Andren

  I am using Lucene with Java. In the index I have a single document with a single name:value-field text:alabama oklahoma When I search for +alabama -oklahoma it returns no results, as expected. However, when I search for -alabama +oklahoma it returns the single document as a match to the query. Has anyone else noticed this behaviour? Any ideas on why this happens?

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• Get the number of packages transmitted per connection

  - by Daniel

  How do I get the number of packages transmitted per TCP connection? I am using Java, but i know I will have to fetch the number from the underlying OS, so this quastion applies to Linux and Windows operating systems and will have different answers for each of them, I assume. I need this information to profile the network load of an application which seems to send too many small packages by flushing the socket streams too often.

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• Best Embedded SQL DB for write performance?

  - by max.minimus

  Has anybody done any benchmarking/evaluation of the popular open-source embedded SQL DBs for performance, particularly write performance? I've some 1:1 comparisons for sqlite, Firebird Embedded, Derby and HSQLDB (others I am missing?) but no across the board comparisons... Also, I'd be interested in the overall developer experience for any of these (for a Java app).

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• Calling super()

  - by Mike

  When do you call super() in Java? I see it in some constructors of the derived class, but isn't the constructors for each of the parent class called automatically? Why would you need to use super?

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• Can I assign array size using NSMutableArray?

  - by Tattat

  I used to be a Java Programmer, which the array need to declare the very first time, like this: int[] anArray; // declares an array of integers anArray = new int[10]; // allocates memory for 10 integers I don't know whether the Objective C , NSMutableArray also give me this ability or not. Actually, I want to make a 10*10 array. thz in advance.

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• Is there a common way to access files, that works both on android and PC?

  - by m01

  Hi, I'm writing an application that will ship in two versions: Android and PC version. Is there a simple way to access files from the shared code? Using java.io is simple, but I don't know how to access android resources or assets using it. And I can't write methods that operate on FileInputStreams instead, because some files contain references to another ones, so I need a way to access them from the method code. Any suggestions?

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• What will be the OOP approach? (or YOUR approach?)

  - by hsmit

  I'm having difficulties with some general OOP & Java approach. There are various ways to let classes/objects communicate with each other. To give a simple example: I need object A to perform action X. Object A needs P, Q and R to perform this action X. Will then Object A retrieve P, Q and R by itself (within action X), or must these values be parameters for action X?

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• How can I send a confirmation email to users of my application?

  - by giri

  Hi I have designed a chat application where different users can create the account, but I do not know how to send a confirmation email to the users. Since I collect their e-mail address in the registration form, how can I send mail to those addresses in Java?

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• question about charAt function

  - by davit-datuashvili

  i know java API function charAt for example String s="dato" char r=s.charAt(0); r is equal d but my question is how realy it works or what function can i use instead of charAt function to get same result? thanks

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• How can we generate email failure notice ?

  - by Anu

  How can we generate email failure notice in java if the email is not delivered due to issues like email address does not exists or delivery failure etc.... something like yahoomail notifications Thanks

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• What does it mean when a ByteInputStream keeps returning 0?

  - by Zombies

  I have a ByteInputStream, created from a Socket in Java. The connection is to a simple web server that uses chunked transfer encoding. The web server does in fact work in normal browser. But in my program, I am attempting to read, I read the first first bytes (some 5kb of data). But each read after that returns 0 bytes read. Isn't it supposed to block until it can read?

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