Forcing deallocation of large cache object in Java

Posted by Jack on Stack Overflow See other posts from Stack Overflow or by Jack
Published on 2010-03-09T02:56:17Z Indexed on 2010/03/09 3:06 UTC
Read the original article Hit count: 290

Filed under:

java

|

garbage-collection

I use a large (millions) entries hashmap to cache values needed by an algorithm, the key is a combination of two objects as a long. Since it grows continuously (because keys in the map changes, so old ones are not needed anymore) it would be nice to be able to force wiping all the data contained in it and start again during the execution, is there a way to do effectively in Java?

I mean release the associated memory (about 1-1.5gb of hashmap) and restart from the empty hashmap..

© Stack Overflow or respective owner

Related posts about java

Tomcat 6: Access Control Exception?

as seen on Server Fault - Search for 'Server Fault'
I'm trying to setup a tomcat6 server, and I'm trying to match another setup someone else established. However, my deployment (default Ubuntu install) uses a policy.d/ directory structure, and the established server just uses a catalina.policy file. I've tried setting every entry in policy.d to match… >>> More
Problem in creation MDB Queue connection at Jboss StartUp

as seen on Stack Overflow - Search for 'Stack Overflow'
I am not able to create a Queue connection in JBOSS4.2.3GA Version & Java1.5, as I am using MDB as per the below details. I am putting this MDB in a jar file(named utsJar.jar) and copied it in deploy folder of JBOSS, In the test env. this MDB works well but in another env. [ env settings and… >>> More
failing to establish connection between Postgres db and gwt

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I am using Postgres and gwt 2.0 for one of my applications. I am facing problem connecting to the database. When I try to connect it gives "ClassNotFoundException". Here is what I get when I try to connect to database: java.lang.ClassNotFoundException: org.postgresql.Driver at java.net… >>> More
failing to establish connection between postgre db and gwt

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, For i am using postgre and gwt 2.0 for one of my applications. I am facing problem connecting to the database. When i try to connect it gives "ClassNotFoundException". Here is what i get when i try to connect to database: java.lang.ClassNotFoundException: org.postgresql.Driver at java.net… >>> More
Migration and deployement problems JBoss 4.2.2.GA to JBoss 6.0.0.M2

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I'm trying to migrate an application running on JBoss 4.2.2.GA to JBoss 6.0.0.M2 I give you some log to explain my problem : boot.log : 2010-03-16 09:59:29,406 ERROR [org.jboss.system.server.profileservice.ProfileServiceBootstrap] (Thread-2) Failed to load profile: Summary of incomplete deployments… >>> More

Related posts about garbage-collection

Strings and Garbage Collection

as seen on Stack Overflow - Search for 'Stack Overflow'
I have heard conflicting stories on this topic and am looking for a little bit of clarity. How would one dispose of a string object immediately, or at the very least clear traces of it? >>> More
How does Garbage Collection in Java work?

as seen on Stack Overflow - Search for 'Stack Overflow'
I was wondering how the garbage collector in Java deals with the following situation. Object A has a reference to Object B and Object B has a reference to Object C. The main program has a reference to Object A. So you can use Object B trough Object A, and Object C trough Object B trough Object… >>> More
Why other languages don't have automatic garbage collection similar as that of the Java Garbage Coll

as seen on Stack Overflow - Search for 'Stack Overflow'
What are the reason/s behind other languages not having a Garbage Collector? >>> More
Garbage collection behaviour for String.intern()

as seen on Stack Overflow - Search for 'Stack Overflow'
If I use String.intern() to improve performance as I can use "==" to compare interned string, will I run into garbage collection issues. How does the garbage collection mechanism of interned strings differ from normal strings ? >>> More
ASP.Net 4.5 Garbage Collection Improvement

as seen on Geeks with Blogs - Search for 'Geeks with Blogs'
Originally posted on: http://geekswithblogs.net/Aligned/archive/2013/06/24/asp.net-4.5-garbage-collection-improvement.aspxI just read Five Great .NET Framework 4.5 Features on CodeProject by Shivprasad koirala. Feature 5 in his article mentions the GC background cleanup and has a good explanation… >>> More