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Easy Learn Java: Programming Articles, Examples and Tips - Page 64


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I am getting ''OutOfMemoryError''. How do I prevent such memory leaks?

Go to all tips in General Java

Question: I am getting "OutOfMemoryError". How do I prevent such memory leaks?

Answer: It is not always a memory leak that causes "OutOfMemoryError".
A memory leak is a situation when some application, for example JVM allocates some amount of memory and then loses pointers to that area. So, the allocated area becomes a "black box" which you can not access and you need a key to open it.
It is very rare situation when some Java code causes memory leaks.
They are reported and can be found at "Bug parade" on SUN's web site.

"OutOfMemoryError" often caused by bad design. It can be for example:

1. Your program trying to process too much data. Increase the amount of memory or decrease the amount of data to be processed.
Actually you can do it in a wise way: control how much memory left and if it less than, let say 20 %, decrease the processing speed.
It was described in one of our tips while ago...

2. Your program holding too many objects and then program is running out of memory.
You need to use close methods if you do need them. You can even explicitly set a reference to null to speed up garbage collection.

3. You use too many objects with finalizers... They consume your memory before you get any chance to run them...



44 comments | Printer Friendly Page  Send to a Friend | Score: 3
Posted by jalex on Monday, July 21, 2003 (00:00:00) (5578 reads)

Are any classes available to deal with Mac Address ( not IP ) and which are thes

Go to all tips in Networking

Question: Are any classes available to deal with Mac Address ( not IP ) and which are these classes?

Answer: Java deals at the higher level with protocol TCP/IP (layers 4/3). Mac address is used in layer 2 by Ethernet.
Although you can work with them if you use ARP, RARP (Address Resolution Protocol and Reverse Address Resolution Protocol) and some native code...

***************************************
Our older tips: March 22, 2001 - October 21, 2002 read here.
All published and not published on the site tips you can find here



20 comments | Printer Friendly Page  Send to a Friend | Score: 1
Posted by jalex on Friday, July 18, 2003 (00:00:00) (5222 reads)

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