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• Reading files with Java

  - by sikas

  I would like to know how can I read a file byte by byte then perform some operation every n bytes. for example: Say I have a file of size = 50 bytes, I want to divide it into blocks each of n bytes. Then each block is sent to a function for some operations to be done on those bytes. The blocks are to be created during the read process and sent to…

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• How to crete a Java Iterator that throws IOException

  - by Antonio

  I'd like to implement an iterator that retrieves objects from disk/network. Iterator itr = getRemoteIterator(); while(itr.hasNext()) { Object element = itr.next(); System.out.print(element + " "); } However the problem is that hasNext() and next() methods of the Iterator object does not allow to throw IOException. Is there any other…

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• Accessing Java Connector Architecture (JCA) from a Non-Managed environment

  - by Paul Kuykendall

  Hi, We have been using a JCA to interface with a low-level network resource from within WebSphere, however we have a requirement to be able to access the same network resource externally from Tomcat (i.e. not in a managed environment). The network communication and protocol layouts is very verbose, so we would rather not copy/paste several…

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• Java Scanner - next String until a | is found

  - by user1375883

  Currently I'm trying to read through some basic cells, in this format: +-------+-------+ | | | +-------+-------+ Now I need to get the string representation of the cell's contents and send it off to another method. The problem is that the cells have no pre-defined length. I'm reading these from a file, so my easiest option…

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• JSF index out of bounds exception when submiting a form

  - by selvin

  When I click submit button in a JSF form the following exception occurs. It says an Indexout of bounds exception, but I did not use any ArrayList associated with the code. Is this a bug? what should i do to get rid of this error.. Mojarra: 2.0.2 FCS with primefaces 2.2 JSF: 2.0 NetBeans IDE 6.8 Glassfish Domain V3 Form Code: …

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• JNI 'problmatic frame' causes JVM to crash

  - by HJED

  Hi I'm using JNI to access the exiv2 library (written in C++) in Java and I'm getting a weird runtime error in the JNI code. I've tried using various -Xms and -Xmx options, but that seems to have no affect. I've also tried running this code on JDK1.7.0 with the same result. # A fatal error has been detected by the Java…

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• Oracle Response to Apache Departure from JCP

  - by Henrik Ståhl

  Last month Oracle renominated Apache to the Java Executive Committee because we valued their active participation and perspective on Java. Earlier this week, by an overwhelming majority, the Java Executive Committee voted to move Java forward by formally initiating work on both Java SE 7 and SE 8 based on their technical…

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• how to read input with multiple lines in java

  - by Gandalf StormCrow

  Hi all, Our professor is making us do some basic programming with java, he gaves a website and everything to register and submit our questions, for today I need to do this one example I feel like I'm on the right track but I just can't figure out the rest .. here is the actualy question : **Sample Input:** 10 12 10 14…

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• NoHostAvailableException With Cassandra & DataStax Java Driver If Large ResultSet

  - by hughj

  The setup: 2-node Cassandra 1.2.6 cluster replicas=2 very large CQL3 table with no secondary index Rowkey is a UUID.randomUUID().toString() read consistency set to ONE Using DataStax java driver 1.0 The request: Attempting to do a table scan by "SELECT some-col from schema.table LIMIT nnn;" The fail: Once I go…

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• Effectively implementing a game view using java

  - by kdavis8

  I am writing a 2d game in java. The game mechanics are similar to the Pokémon game boy advance series e.g. fire red, ruby, diamond and so on. I need a way to draw a huge map maybe 5000 by 5000 pixels and then load individual in game sprites to across the entirety of the map, like rendering a scene. Game sprites…

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• Article: Interceptors 1.1 in Java EE 6

  - by OracleTechnologyNetwork

  This Tip Of The Day (TOTD) attempts to explain the basics of Interceptors 1.1 - a "new" specification introduced in the Java EE 6. Interceptors do what they say - they intercept on invocations and lifecycle events on an associated target class. The specification is not entirely new as the concept is borrowed…

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• StackWrap4J Java wrapper

  - by Bill the Lizard

  The StackWrap4J 1.0.1 jar is now available! (See the changelog) Sample Code / Screen Shot The following code snippet was used to test the wrapper in the Android emulator: TextView text = (TextView)findViewById(R.id.output); StackWrapper stackWrap = new StackOverflow(); String displayText = null; try { …

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• Technical Article: Dynamic Language Support on the Java Virtual Machine

  - by OracleTechnologyNetwork

  This Oracle Magazine article will help you take advantage of the new invokedynamic Java bytecode instruction for the JVM and the new method handle linkage mechanism.

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• Article: DataSource Resource Definition in Java EE 6

  - by OracleTechnologyNetwork

  This updated Enterprise Tech Tip shows you how to use Java EE 6 to create a datasource definition using either annotations or deployment descriptors. It also includes a sample application that demonstrates the use of these features.

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• Java hosting service provider?

  - by Rahul Utb

  I want to host a Java web application. How to decide which hosting service provider to choose from. Is there any source of info where from I can get such info. Yes most important, being from India which service provider service should I use, from those who say there servers are located in US or they who say…

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• Which Java-specific annoyance fixed in Scala reduces surprises like the ones discussed in Java Puzzl

  - by soc

  Example: In Java this code falls through and prints "Mhhh..." Integer i = new Integer(1); Integer j = new Integer(1); if (i == j) { System.out.println("Equal"); } else if (i < j) { System.out.println("Smaller"); } else if (i > j) { …

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• Problem by installing Java

  - by Shagun

  Yesterday night I was trying to download Java as per instructions given on http://developer.android.com/ .But I messed up somewhere and had to give up the thing. But since morning when ever I try to install or remove some thing I get the following response …

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• Dependency Checker/ Installer With Java/Ant

  - by jsn

  I need some kind of software to easily roll out code on new servers. I use Apache Ant for builds. However, say I want to set-up a new server fast and my Java program depends on GhostScript, if there any software that can automatically check the computer for…

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• Practicing Java Swing

  - by user1265125

  I've been learning Java by myself through many different online and offline resources. I just finished some basic practice and theoretical knowledge of Swing. Now, to become good at it I need some practice problems which would test my Swing skills,…

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• C++ track or Java track in college?

  - by sq1020

  I'm starting some CS classes at a community college and they have two tracks. Either you take three courses in C++ or three courses in Java. Both cover the same fundamental material e.g. data structures, algorithms etc. Which would you recommend…

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• Java based portal framework

  - by Jatin

  We have an application that needs to be built and are looking for some Java based portal framework. In last few days I have gone through over 10 different open source option LiveRay, JetSpeed2, GateIn etc. But they are all too complex to be judged…

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• Interconnect nodes in a Java distributed infrastructure for tweet processing

  - by David Moreno García

  I'm working in a new version of an old project that I used to download and process user statuses from Twitter. The main problem of that project was its infrastructure. I used multiple instances of a java application (trackers) to download from…

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• Mixed java version installed

  - by david99world

  I've got the following in /.bashrc export JAVA_HOME=/usr/bin/jdk1.7.0_03/ export PATH=$PATH:/usr/bin/jdk1.7.0_03/bin This is fine, if I do $JAVA_HOME I get the directory above. The problem is if I do java -version I get... OpenJDK…

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• java.lang.reflect.InvocationTargetException in Java

  - by manoj

  if(locs!=null) { System.out.println("location are not null"); Iterator ite = locs.iterator(); DefaultComboItem locObj = null; ArrayList locCode = null; String cod=null; String name=null; while(ite.hasNext()) …

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• JavaOne 2012 - Why Should I Switch to Java SE 7

  - by sowmya

  At JavaOne 2012, David Keenan and Staffan Friberg gave a presentation to answer why it is beneficial to update your production environment to Java SE 7. The following resources will help you learn more about JDK 7 features and…

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