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java Programming Glossary: concurrentConcurrent Modification exception http://stackoverflow.com/questions/1496180/concurrent-modification-exception I have this little piece of code and it gives me the concurrent modification exception. I cannot understand why I keep getting.. why I keep getting it even though I do not see any concurrent modifications being carried out. import java.util. public class.. String item it.next System.out.println s java concurrentmodification share improve this question To avoid the ConcurrentModificationException..
http://stackoverflow.com/questions/1986998/resultset-to-pagination far from memory efficient with thousands rows and multiple concurrent users. For ones who are interested in similar answer in JSF..
Correctly multithreaded quicksort or mergesort algo in Java? http://stackoverflow.com/questions/2210185/correctly-multithreaded-quicksort-or-mergesort-algo-in-java you know of any library that would provide a well tested concurrent quicksort or mergesort algorithm for Java We've had issues on..
How would you implement an LRU cache in Java 6? http://stackoverflow.com/questions/221525/how-would-you-implement-an-lru-cache-in-java-6 but I'm curious if any of the new concurrent collections would be better candidates. UPDATE I was just reading.. way it could possibly be more wonderful is if there were a concurrent version. But alas. I was thinking almost exactly the same thing.. the answers so far it sounds like my best bet for a highly concurrent LRU would be to extend ConcurrentHashMap using some of the same..
Which Actor model library/framework for Java? [closed] http://stackoverflow.com/questions/3357332/which-actor-model-library-framework-for-java JVM publication channels workers. Or just use java util concurrent ExecutorService or com.google.common.util.concurrent Other Scala.. util concurrent ExecutorService or com.google.common.util.concurrent Other Scala based frameworks libraries with Actor implementations..
Production settings file for log4j? http://stackoverflow.com/questions/3537870/production-settings-file-for-log4j issues like Log4J can create deadlock conditions concurrent package donation and Deadlock with RollingFileAppender . It.. killing lock synchronization issues under heavy concurrent load. Like Category callAppenders synchronization causes java.lang.Thread.State..
How to solve the “Double-Checked Locking is Broken” Declaration in Java? http://stackoverflow.com/questions/3578604/how-to-solve-the-double-checked-locking-is-broken-declaration-in-java and is more elegant by the standards applied to low level concurrent programming. On my machine the method above is about 25 percent..
Is iterating ConcurrentHashMap values thread safe? http://stackoverflow.com/questions/3768554/is-iterating-concurrenthashmap-values-thread-safe onset. For aggregate operations such as putAll and clear concurrent retrievals may reflect insertion or removal of only some entries... it java multithreading concurrency thread safety concurrenthashmap share improve this question What does it mean That.. will not break if you do this that's part of what the concurrent in ConcurrentHashMap means . However there is no guarantee that..
Singletons vs. Application Context in Android? http://stackoverflow.com/questions/3826905/singletons-vs-application-context-in-android subtle bugs may arise when not properly synchronized in concurrent applications. I consider it an anti pattern it's a bad object..
What's the difference between ConcurrentHashMap and Collections.synchronizedMap(Map)? http://stackoverflow.com/questions/510632/whats-the-difference-between-concurrenthashmap-and-collections-synchronizedmap I have a Map which is to be modified by several threads concurrently. There seem to be three different synchronized Map implementations.. For your needs use ConcurrentHashMap . It allows concurrent modification of the Map from several threads without the need..
Why does JSF need to save the state of UI components on the server side? http://stackoverflow.com/questions/5474316/why-does-jsf-need-to-save-the-state-of-ui-components-on-the-server-side much memory on the server side if there are thousands of concurrent user sessions I have an application where users can post blogs.. much memory on the server side if there are thousands of concurrent user sessions I have an application where users can post blogs.. and profile your webapp with expected max amount of concurrent users and then give the appserver 125 ~ 150 of maximum measured..
Java multi-threading & Safe Publication http://stackoverflow.com/questions/801993/java-multi-threading-safe-publication multi threading Safe Publication After reading Java concurrent in practice and OSGI in practice I found a specific subject..
Backport Java 5/6 features to Java 1.4? http://stackoverflow.com/questions/1011706/backport-java-5-6-features-to-java-1-4 or Retroweaver . backport of libraries e.g. Concurrent Backport but this does not help for generics. emulation of Java..
SQLite in a multithreaded java application http://stackoverflow.com/questions/10707434/sqlite-in-a-multithreaded-java-application i threads i .start threads i .join System.out.println Concurrent DB access for int i 0 i tasks.length i threads i new Thread.. Insert completed 134 java SQL Insert completed 125 java Concurrent DB access java SQL Insert completed 116 java SQL Insert completed.. 125 milliseconds SQL Insert completed 126 milliseconds Concurrent DB access SQL Insert completed 117 milliseconds SQL Insert completed..
Concurrent Modification exception http://stackoverflow.com/questions/1496180/concurrent-modification-exception Modification exception I have this little piece of code and.. share improve this question To avoid the ConcurrentModificationException you should write your code like this import..
Removing items from a collection in java while iterating over it http://stackoverflow.com/questions/1675037/removing-items-from-a-collection-in-java-while-iterating-over-it setOfElementsToRemove it.next But this throws a ConcurrentModificationException . Note that iterator.remove will not work.. collection while looping over the collection you'll get a Concurrent Modification Exception . This is partially why the Iterator..
Garbage Collection and Threads http://stackoverflow.com/questions/2085544/garbage-collection-and-threads stop the world part. It depends. In the case of the Java 6 Concurrent Compiler there are two pauses during the marking of the roots..
Concurrent/Non-blocking console keyboard input in Java http://stackoverflow.com/questions/2249680/concurrent-non-blocking-console-keyboard-input-in-java Non blocking console keyboard input in Java I'm working on..
Modern alternatives to Java [closed] http://stackoverflow.com/questions/2571267/modern-alternatives-to-java so you can use them in the Executor framework or in Swing. Concurrent programming is very well supported and Software Transactional..
How to make a Java thread wait for another thread's output? http://stackoverflow.com/questions/289434/how-to-make-a-java-thread-wait-for-another-threads-output There are also a number of good books out google for Concurrent Programming in Java Java Concurrency in Practice . To get to..
Unresponsive threading involving Swing and AWT-EventQueue http://stackoverflow.com/questions/2899682/unresponsive-threading-involving-swing-and-awt-eventqueue locks is called the open call technique. See Doug Lea Concurrent Programming in Java 2nd edition sec 2.4.1.3. There is also a..
http://stackoverflow.com/questions/3088814/how-can-i-handle-multiple-messages-concurrently-from-a-jms-topic-not-queue-wit setting for dynamic scaling consider specifying the maxConcurrentConsumers setting instead. Raising the number of concurrent consumers.. your design although I'm not sure what I'd suggest. Concurrent consumption of pub sub messages seems like a perfectly reasonable..
http://stackoverflow.com/questions/3120495/concurrent-set-queue Set Queue Maybe this is a silly question but I cannot seem.. there is one way I know of to do it using a ConcurrentHashMap as the backing map. The following is a sketch only. public.. map. The following is a sketch only. public final class ConcurrentHashSet E extends ForwardingSet E implements Set E Queue E private..
Does Java have support for multicore processors/parallel processing? http://stackoverflow.com/questions/3330430/does-java-have-support-for-multicore-processors-parallel-processing task frameworks. Queues The java.util.concurrent ConcurrentLinkedQueue class supplies an efficient scalable thread safe.. a given number of signals events or conditions hold. ... Concurrent Collections Besides Queues this package supplies a few Collection.. implementations designed for use in multithreaded contexts ConcurrentHashMap CopyOnWriteArrayList and CopyOnWriteArraySet . This also..
Swing Worker Threads Not Concurrent http://stackoverflow.com/questions/3587175/swing-worker-threads-not-concurrent Worker Threads Not Concurrent It seems that when I instantiate 12 Swing Worker threads the..
In Java critical sections, what should I synchronize on? http://stackoverflow.com/questions/416183/in-java-critical-sections-what-should-i-synchronize-on what's happening behind the scenes. You should check out Concurrent Programming in Java a great book on the subject. If you want..
java.util.ConcurrentLinkedQueue http://stackoverflow.com/questions/435069/java-util-concurrentlinkedqueue I want to use java.util.ConcurrentLinkedQueue as.. I want to use java.util.ConcurrentLinkedQueue as a non durable queue for a Servlet. Here's the.. An unbounded thread safe queue based on linked nodes. A ConcurrentLinkedQueue is an appropriate choice when many threads will share..
Lock-Free Concurrent Linked List in Java http://stackoverflow.com/questions/4724995/lock-free-concurrent-linked-list-in-java Free Concurrent Linked List in Java I would like to use a Linked List like.. List exists I think I would use the java.util.concurrent.ConcurrentLinkedQueue E . Is this a good choice it is not really a linked.. concurrency linked list share improve this question ConcurrentLinkedQueue is a superb lock free queue and does what a concurrent..
Concurrent Modification Exception : adding to an ArrayList http://stackoverflow.com/questions/6866238/concurrent-modification-exception-adding-to-an-arraylist Modification Exception adding to an ArrayList The problem occurs.. 07 28 15 36 59.815 ERROR AndroidRuntime 4026 java.util.ConcurrentModificationException 07 28 15 36 59.815 ERROR AndroidRuntime.. arraylist iteration share improve this question ConcurrentModificationException occurs when you modify the list by adding..
Simple Thread Management - Java - Android http://stackoverflow.com/questions/990948/simple-thread-management-java-android . At the minute what I do is Manage Concurrent Tasks private Queue AsyncTask Bitmap Integer Integer tasks new..
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