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• Run Jar in Background on Linux

  - by Benny

  I have a jar that runs forever (infinite loop with socket listening thread) and need it to run in the background at all times. An example would be: "java -jar test.jar" How do I do this? Thanks in advance!

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• Hibernate Initial SessionFactory creation failed

  - by user364746

  Hello.. I'm trying to use hibernate to fill my jsf selectonemenu in ApplicationBean (in Liferay). The problem is that I got Initial SessionFactory creation failed problem. Before putting my functions in the applicationbean I was setting them in sessionbean and I got no error. For now the full error Initial SessionFactory creation failed.java.lang.ClassCastException: org.hibernate.type.StringType cannot be cast to org.hibernate.type.VersionType Thanks

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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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• 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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• 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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• Difference between a Deprecated and Legacy API?

  - by Vaibhav Bajpai

  I was studying the legacy API's in the Java's Collection Framework and I learnt that classes such as Vector and HashTable have been superseded by ArrayList and HashMap. However still they are NOT deprecated, and deemed as legacy when essentially, deprecation is applied to software features that are superseded and should be avoided, so, I am not sure when is a API deemed legacy and when it is deprecated.

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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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• 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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• My Android game runs out of memory when it is closed and opened and couple times.

  - by sirconnorstack

  I have an Android game that has an activity for the menu, and then another activity for the game that creates a SurfaceView and Thread to deal with canvas drawing and game logic. When you exit the game and start it up again too much or if you open and close the keyboard (thus restarting the activity), the game runs out of memory, usually when loading a bitmap: java.lang.OutOfMemoryError: bitmap size exceeds VM budget How can I keep all my images in memory without loading them again when the game changes state, or how can I release them from memory and let them reload when the game is restarted?

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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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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