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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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• How to identify which server side script language is using with a web site?

  - by Leo

  How to identify which server side script language was used with a web site? Asp.Net? PHP? RoR? Java? or other? For example, Which server side script language was used with stackoverflow.com?

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• Hibernate - how to create list of pojos?

  - by AspNewbie

  I am very new to Hibernate. I have MySQL database and mapped pojos. What should I do next? I know little bit LINQ to SQL from .NET, and it generates me List of mapped objects. So basically, what are my next steps after creating POJOS if I want to have List of them and do CRUD operations upon them and data will be also saved in DB not only in java objects ? kthx

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• Last substring of string

  - by javaguy

  In java we have indexOf and lastIndexOf. Is there anythink like lastSubstring? It should work like : "aaple".lastSubstring(0, 1) = "e";

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• best software synthesizer for piano

  - by pianoman

  Could someone recommend a good and inexpensive software synthesizer which generates really good piano sound (sample-based); support for other instruments is not required. OS: Windows or MacOS. Java interface would be a great asset.

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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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• 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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• Type hinting for functions in Clojure

  - by mikera

  I'm trying to resolve a reflection warning in Clojure that seems to result from the lack of type inference on function return values that are normal Java objects. Trivial example code that demonstrates the issue: (set! *warn-on-reflection* true) (defn foo [#^Integer x] (+ 3 x)) (.equals (foo 2) (foo 2)) => Reflection warning, NO_SOURCE_PATH:10 - call to equals can't be resolved. true What is the best way to solve this? Can this be done with type hints?

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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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• What are all the concurrent things [data structure, algorithm, locking mechanism] missing in .Net 3.

  - by user49767

  First time I am bit disappointed in StackOverflow cause my http://stackoverflow.com/questions/2571727/c-concurrency-vs-java-concurrency-which-is-neatly-designed-which-is-better question was closed. My intension was just trying to gather knowledge from programming guru's who worked in both the programming technologies. Rather closing this question, please help me by discussing what is good, bad, and ugly in multi-threading part in both the platforms. It is also welcome, if someone would like to compare with .Net 4.0 with JDK 6 (or JDK 7)

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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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• Multi language testing framework

  - by santiiiii

  I need to write two versions of the same application, one in .NET and the other one in Java. So I'd like to write a single test suite, and then use it against both codebases. Which testing tool would you advise me to use?

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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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• javax.crypto AES encryption - Do I only need to call doFinal?

  - by Spines

  I want to do AES CBC encryption in Java. I'm using javax.crypto. After I have the Cipher initialized, do I only need to call doFinal on the clear bytes to properly encrypt it? Or do I need to do something with update? Documentation says update: Continues a multiple-part encryption or decryption operation and doFinal Encrypts or decrypts data in a single-part operation, or finishes a multiple-part operation what exactly do they mean by multiple-part encryption?

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• android get URL path

  - by Tom91136

  I've got a string: public://imageifarm/3600.jpg How can I extract the imageifarm/3600.jpg Part out using android? What I've tried so far: URL drupalQuestionNodeImageURI = new URL("public://imageifarm/3600.jpg"); Log.d("TAG", drupalQuestionNodeImageURI.getPath()); but it throws this exception: 09-16 17:24:39.992: W/System.err(3763): java.net.MalformedURLException: Unknown protocol: public How can I solve this? I know I can use regular expressions but that seems to defeat the purpose of URL(URI) in this case.

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• The device is not connected exception

  - by Dani

  I try to open a large number of files but after 5000 files or so I get Exception in thread "Main" java.io.IOException: The device is not connected Is this the expected behavior? Is there a way around it? I want to leave my code as straightforward as possible.

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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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• 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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• 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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• How to set JFrame to appear centered, regardless of the Monitor resolution

  - by AmateurProgrammer

  While working in Java, I find it hard to position my Main application window in the very center of the screen when I start the application. Is there any way I can do that? I tried with some of the predefined methods but none worked. BTW it doesn't have to be vertically centered, horizontal alignment is the more important goal for me. But vertical alignment is also welcome. Thanks

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• Floating point arithmetics restricted to integers

  - by user396672

  I use doubles for a uniform implementation of some arithmetic calculations. These calculations may be actually applied to integers too, but there are no C++-like templates in Java and I don't want to duplicate the implementation code, so I simply use "double" version for ints. Does JVM spec guarantees the correctness of integer operations such a <=,=, +, -, *, and / (in case of remainder==0) when the operations are emulated as corresponding floating point ops? (Any integer, of course, has reasonable size to be represented in double's mantissa)

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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 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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• 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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• Struts 1.1 - No bean specified Error

  - by Ruepen

  What would the possible scenarios be in which I would get this error produced from a struts web app? java.lang.IllegalArgumentException: No bean specified

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