Solved

Max-heap-size of JVM

Posted on 2003-11-02
12
2,018 Views
Last Modified: 2013-11-23
Dear Experts,
I set these properites in JLNP file
<j2se version="1.3+" initial-heap-size="64m"/>
<j2se version="1.3+" max-heap-size="256m"/>
Result:
I catch OutOfMemory exception when JVM reach 65088 MB
When I change initial-heap-size="64m" ==> initial-heap-size="128m"
The I couldnot start jws.
Could you help me increase more heap size of JVM?
Thank you very much for your help.
0
Comment
Question by:sontnvn
  • 8
  • 4
12 Comments
 
LVL 92

Expert Comment

by:objects
ID: 9669196
> The I couldnot start jws.

why not?
0
 
LVL 92

Expert Comment

by:objects
ID: 9669276
Also perhaps should be:

<j2se version="1.3+" initial-heap-size="64m" max-heap-size="256m"/>
0
 
LVL 92

Expert Comment

by:objects
ID: 9669332
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

Author Comment

by:sontnvn
ID: 9670385
> <j2se version="1.3+" initial-heap-size="64m" max-heap-size="256m"/>
===> Nothing changed
0
 
LVL 92

Expert Comment

by:objects
ID: 9674454
> ===> Nothing changed

Can you explain exactly what is happening.
0
 

Author Comment

by:sontnvn
ID: 9675032
Case 1:
<j2se version="1.3+" initial-heap-size="64m"/>
<j2se version="1.3+" max-heap-size="256m"/>
Case2:
<j2se version="1.3+" initial-heap-size="64m" max-heap-size="256m"/>

In both case, My application throw OutOfMemory exception. I trace memory information and this is the result:
Runtime.getRuntime().totalMemory()/1024 = 65088
Runtime.getRuntime().freeMemory()/1024 = 17638
Runtime.getRuntime().maxMemory()/1024 = 131072
Physical memory is 1GB, why Runtime.getRuntime().maxMemory()/1024 always return 131072?
Anyway, when I run my application by java command line and set -Xmx = 256 then it ran well.
0
 
LVL 92

Expert Comment

by:objects
ID: 9675083
> Physical memory is 1GBwhy Runtime.getRuntime().maxMemory()/1024 always return 131072?

Physical memory is not reltaed, the VM has it's own allocated memory space.
0
 

Author Comment

by:sontnvn
ID: 9675792
How can we force JVM increase its maxMemory size? (JWS environment)
When the application throw OutOfMemory exception, task manager (Win2k) report Mem Usage = ~110 000MB.
0
 
LVL 92

Expert Comment

by:objects
ID: 9675811
> How can we force JVM increase its maxMemory size?

That is supposedly what max-heap-size should be doing.

Can you post your complete jnlp file.
0
 

Author Comment

by:sontnvn
ID: 9676084
Below is our jnlp file

<?xml version="1.0" encoding="utf-8"?>

<jnlp spec="1.0+"
      codebase="http://napple/nApple"
      href="nApple.jnlp">
   <resources>
      <!--<j2se version="1.3+" initial-heap-size="128m" max-heap-size="256m"/> -->
      <j2se version="1.3+" initial-heap-size="64m"/>
      <j2se version="1.3+" max-heap-size="128m"/>
      <j2se version="1.3+" href="http://java.sun.com/products/autodl/j2se"/>
      <jar href="nApple.jar" main="true" download="eager"/>
   </resources>
   <application-desc main-class="com.ykgw.ees.ui.NApple">
         <argument>10</argument>
         <argument>1</argument>
         <argument>http://napple/nApple/nApple.wsdl</argument>
         <argument>http://tempuri.org/nApple/message/</argument>
         <argument>http://schemas.xmlsoap.org/soap/encoding/</argument>
      <argument>http://tempuri.org/nApple/action/PlanDispatcher</argument>
      <argument>50</argument>
   </application-desc>
</jnlp>

>That is supposedly what max-heap-size should be doing.
==> That mean we cannot change this value?
0
 
LVL 92

Accepted Solution

by:
objects earned 250 total points
ID: 9676191
Try with only one j2se entry.
0
 
LVL 92

Expert Comment

by:objects
ID: 9676511
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
servlet example 11 56
login jsp example 24 85
Facing this issue for maven proxy setting 2 25
What is the use of Forwarding Class in java 1 34
Are you developing a Java application and want to create Excel Spreadsheets? You have come to the right place, this article will describe how you can create Excel Spreadsheets from a Java Application. For the purposes of this article, I will be u…
Introduction This article is the last of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article covers our test design approach and then goes through a simple test case example, how …
This tutorial covers a step-by-step guide to install VisualVM launcher in eclipse.
This video teaches viewers about errors in exception handling.

685 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question