Java xmx and xms
Hi All,
I want to know what xmx and xms settings are given at the time of java is launched, in the java code.
Runtime.getFreeMemory gives size of current free heap size. I am not intrested in such calls.
java -Xmx 512 -Xms 256 Test
In test.java I need some code which prints values of mx and ms.
thanks
renjith.
Check this out..
[http://forums.sun.com/thread.jspa?threadID=705258&messageID=4087905#4087905|http://forums.sun.com/thread.jspa?threadID=705258&messageID=4087905#4087905]
And look! whos made the last post there?
;-)
Similar Messages
-
Newbie Question: Java -Xmx and other settings...
Hi all I have a simple question,
I know that you can use the -Xms and -Xmx to set the heap size, but when I run this command is it permanent or do I have to set it each time I boot up my Windows system? How do tell what the current heap size is?
I would be grateful for any help.
Thanks!My dear Friend,
if you are running your program with
java -Xmx 1024 -Xms 500 ....
This values you are using are like jvm arguments and you have to provide them everytime you are running your program.....
Regards, -
What is value to be set for XMx and XMs for a 20 GB Ram server for a single web application ?
I am told that it is best practise to set XMs and XMx with equal values ?
Why ?You can -Xms and -Xmx.
To set a -Xmx for 20000M you need to have more than 20 GB of memory and be running the 64-bit version of java on a platform supported for 64-bit.
Setting the -Xms (minimum size) to the same as 20 GB means you expect java to use 20 GB as soon as it starts. If your application does this you should consider optimising it as a typical web server should not use more than about 512 MB on start up. -
Optimizing xmx and xms for Performance
Folks,
Our 2004s Portal is running on Windows 64 machine with 16 GB ram , the xmx and xms are by default 1024 . Our Portal is bit slow .. if I increase xmx and xms to 2048 will it improve the performance.
Thanks,
ManishHello!
According to SAP the heap size should be set to 2048 for 64bit systems running Netweaver7, so you should definitely increase this. (Please consult note 723909 for details of the recommended settings - NewSize and PermSize will probably be too small as well.)
There is no guarantee though that this will increase the performance. If it is due to a lack of memory then it will.
Regards,
Jörg -
Differnce between -ms/-mx and -Xms/-Xmx
Was wondering if any could explain the difference between the settings -ms and -Xms (as well as -mx and -Xmx).
I run java with -Xms and -Xmx flags with identical
values (which are listed above), and if I set the
values to any higher than those values (even by 1 MB),
the browser's window crashes every time it tries to
load a java applet. For these values or lower it runs
good, except for poor performance due to memory
shortage.And what happens when you run it in the applet viewer on those systems? (And thus do not run it in the browser.) -
Maybe it's stupid question, but i don't know how to use command java -Xmx<size> for my program?
I have 1Gb Ram, but when I lunch my program and it peaks about 80Mb in my memory i get an OutOfMemoryError.
How to increase this value?? (i need about 768Mb )how to
use command java -Xmx<size> for my program?If your main class is named myClass, then the command line would be:
java -Xmx768M myClassA few notes:
If you set -Xmx to a value larger than (size of RAM - size of OS - size of other apps running) then the processes will start swapping. Since garbage collection traverses the entire java heap looking for live objects (by definition), this could start the system thrashing (continually swapping). You will get a drop in performance. So remember to allow some RAM for the OS and any other jobs you have running.
For more information, take a look at these articles:
Java HotSpot VM Options
http://java.sun.com/docs/hotspot/VMOptions.html
Tuning Garbage Collection with the 5.0 Java Virtual Machine
http://java.sun.com/docs/hotspot/gc5.0/gc_tuning_5.html
I have 1Gb Ram, but when I lunch my program and it
peaks about 80Mb in my memory i get an
OutOfMemoryError.---------------------------------------------------------------------
"Troubleshooting Guide for J2SE 5.0",
http://java.sun.com/j2se/1.5/pdf/jdk50_ts_guide.pdf -
Whats is difference between Java JRE and Java SDK
Hi,
what is the difference between Java JRE and Java SDK...
i think both of them have the same set of files to be installed...
I am not able to understand where they differThe JRE (Java runtime Environment) contains just the stuff necessary to run Java and the SDK (System Development Kit) contains the extra stuff necessary (and also helpful) to develop in Java.
-
This is a repeat of this post: Java SSO and IIS
Noone answered there.
Hello,
my organization uses Java SSO authentication in Oracle Application Server. Now we want to "expand" SSO so that our IIS applications can benefit from Oracle SSO and user needn't print user name / password again. Is there any way to use Java SSO in IIS? In this project we use Java SSO, not Oracle Identity Management.
Thanks in advanceHi ,
I was installed and configured policy agent successfully.while i am trying to access the application url i am getting following error.
I am using IIS6.0 and access manager 7.1.
Error 2824:15b9918 AuthService: AuthService::processLoginStatus() Exception message=[Application user ID is not valid.] errorCode='107' templateName=login_failed_template.jsp.
2009-03-10 00:03:05.828 Error 2824:15b9918 PolicyEngine: am_policy_evaluate: InternalException in AuthService::processLoginStatus() with error message:Exception message=[Application user ID is not valid.] errorCode='107' templateName=login_failed_template.jsp and code:3
2009-03-10 00:03:05.828 Warning 2824:15b9918 PolicyAgent: am_web_is_access_allowed()(http://fcs-ylwkuzfoz1q.ramesh.com:99/website.html, GET) denying access: status = Access Manager authentication service failure
2009-03-10 00:03:05.828 Debug 2824:15b9918 PolicyAgent: am_web_is_access_allowed(): Successfully logged to remote server for GET action by user unknown user to resource http://fcs-ylwkuzfoz1q.ramesh.com:99/website.html.
2009-03-10 00:03:05.828 Info 2824:15b9918 PolicyAgent: am_web_is_access_allowed()(http://fcs-ylwkuzfoz1q.ramesh.com:99/website.html, GET) returning status: Access Manager authentication service failure.
2009-03-10 00:03:05.828 Debug 2824:15b9918 PolicyAgent: HttpExtensionProc(): status after am_web_is_access_allowed = Access Manager authentication service failure (3)
2009-03-10 00:03:05.828 Error 2824:15b9918 PolicyAgent: HttpExtensionProc(): status: Access Manager authentication service failure (3)
2009-03-10 00:03:05.828 Debug 2824:15b9918 PolicyAgent: OnSendResponse(): HTTP Status code is 500
can any one please help me to resolve this.
Thanks
Ramesh Kumar GV -
I am a IT graduate and I still need some clarification on the relationship between Java SE and Java EE API. Does EE include SE?
For application development, I know I can use only SE without the EE, but can I use EE alone without SE?
Any good articles addressing my questions?
Thank you very much
RJava EE in fact extends java SE, its primarily aim is to simplify developing multitier enterprise applications (Java SE provides all the necessary basic libraries etc.)
Because Java EE is an extension of Java SE, you cant use EE without SE - without SE there is no EE. -
Compatibility between Java crypto and open ssl
Hello
I have some question about compatibility between java crypto and openssl library.
This is my case:
1.I created DESede key and stored it to file:
SecretKey key = KeyGenerator.getInstance("TripleDES").generateKey();
File f = new File("c:\\key.dat");
DataOutputStream dos =new DataOutputStream(new FileOutputStream(f));
dos.write(key.getEncoded());
dos3.close();2.I encrypt some file "c:\\normal.dat" through:
ecipher.init(Cipher.ENCRYPT_MODE, key2);
byte[] enc = ecipher.doFinal(normalData);
File f2 = new File("c:\\enc.dat");
DataOutputStream dos =new DataOutputStream(new FileOutputStream(f2));
dos.write(enc);
dos.close();You have carefully left out some critical java code, namely the Cipher.getInstance() method. You'll notice in the documentation for this method that there 3 components to the "transform" argument of this method, the algorithm, the mode, and the padding. All of these must match exactly with the what openssl is using. Furthermore, if you are using one of the modes which require an IV, like CBC mode, then this must match exactly too. If you don't explicitly specify some of these parameters, you might get default values supplied. It is up to you to find out what these are.
-
Problem with java look and feel
Hi! This is my first time posting here. Do apologize me if I am not familiar with the regulations here. Thanks!
Currently, I am developing a project using NetBeans IDE. It is using RMI, and some basic UI. I am facing the following error when I tried applying the java look and feel code. Please see below for the code used and the error message.
try { UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} catch (Exception e) { }
Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: javax.swing.plaf.ColorUIResource cannot be cast to java.util.List
at javax.swing.plaf.metal.MetalUtils.drawGradient(MetalUtils.java:196)
at javax.swing.plaf.metal.MetalInternalFrameTitlePane.paintComponent(MetalInternalFrameTitlePane.java:384)
at javax.swing.JComponent.paint(JComponent.java:1027)
at javax.swing.JComponent.paintChildren(JComponent.java:864)
at javax.swing.JComponent.paint(JComponent.java:1036)
at javax.swing.JComponent.paintChildren(JComponent.java:864)
at javax.swing.JComponent.paint(JComponent.java:1036)
at javax.swing.JLayeredPane.paint(JLayeredPane.java:564)
at javax.swing.JComponent.paintChildren(JComponent.java:864)
at javax.swing.JComponent.paint(JComponent.java:1036)
at javax.swing.JComponent.paintChildren(JComponent.java:864)
at javax.swing.JComponent.paint(JComponent.java:1036)
at javax.swing.JLayeredPane.paint(JLayeredPane.java:564)
at javax.swing.JComponent.paintChildren(JComponent.java:864)
at javax.swing.JComponent.paintToOffscreen(JComponent.java:5129)
at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:285)
at javax.swing.RepaintManager.paint(RepaintManager.java:1128)
at javax.swing.JComponent.paint(JComponent.java:1013)
at java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:21)
at sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:60)
at sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:97)
at java.awt.Container.paint(Container.java:1797)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:734)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:679)
at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:659)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:128)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
Java Result: 1Thanks for everyone's help!
Below is the executable code generated using NetBeans which is enough to generate the error message. Sometimes you can get the error message just by running the program. Sometimes the error will occur when you go into the Menu and click on Item.
* NewJFrame.java
* Created on January 8, 2008, 1:11 PM
package client;
import javax.swing.UIManager;
* @author Yang
public class NewJFrame extends javax.swing.JFrame {
/** Creates new form NewJFrame */
public NewJFrame() {
initComponents();
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
// <editor-fold defaultstate="collapsed" desc=" Generated Code ">
private void initComponents() {
jDesktopPane1 = new javax.swing.JDesktopPane();
jInternalFrame1 = new javax.swing.JInternalFrame();
jMenuBar1 = new javax.swing.JMenuBar();
jMenu1 = new javax.swing.JMenu();
jMenuItem1 = new javax.swing.JMenuItem();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
javax.swing.GroupLayout jInternalFrame1Layout = new javax.swing.GroupLayout(jInternalFrame1.getContentPane());
jInternalFrame1.getContentPane().setLayout(jInternalFrame1Layout);
jInternalFrame1Layout.setHorizontalGroup(
jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 190, Short.MAX_VALUE)
jInternalFrame1Layout.setVerticalGroup(
jInternalFrame1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGap(0, 95, Short.MAX_VALUE)
jInternalFrame1.setBounds(80, 40, 200, 130);
jDesktopPane1.add(jInternalFrame1, javax.swing.JLayeredPane.DEFAULT_LAYER);
jMenu1.setText("Menu");
jMenuItem1.setText("Item");
jMenuItem1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jMenuItem1ActionPerformed(evt);
jMenu1.add(jMenuItem1);
jMenuBar1.add(jMenu1);
setJMenuBar(jMenuBar1);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jDesktopPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 484, Short.MAX_VALUE)
.addGap(20, 20, 20))
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jDesktopPane1, javax.swing.GroupLayout.DEFAULT_SIZE, 279, Short.MAX_VALUE)
pack();
}// </editor-fold>
private void jMenuItem1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
jInternalFrame1.setVisible(true);
* @param args the command line arguments
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new NewJFrame().setVisible(true);
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
e.printStackTrace();
// Variables declaration - do not modify
private javax.swing.JDesktopPane jDesktopPane1;
private javax.swing.JInternalFrame jInternalFrame1;
private javax.swing.JMenu jMenu1;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JMenuItem jMenuItem1;
// End of variables declaration
}Edited by: Boxie on Jan 7, 2008 11:23 PM -
Problem with Java 5 and Oracle 10g JDBC driver
Hi All,
Currently we upgrade our web application to Java 5 and Oracle 10.2 JDBC driver. And we encountered a bug, when the user entered the information through UI and data didn't store into database (Oracle 9i). The problem is that this bug is not happend so often maybe once a day and this did not happen before we upgraded to Java 5 and Oracle 10.2 JDBC driver. Does anyone encounter the same problem ? Is this Java 5 problem or Oracle JDBC driver problem ?
Thanks,sounds like a database problem...
Are you using a driver version that's supported for your database engine?
What else did you change? We once ran into a major bug in our application that had for 5 years been masked by performance problems in our hardware and infrastructure.
Once those were resolved the bug showed itself and caused tens of thousands of records to be erroneously inserted into our database every day.
It's certainly NOT a problem with your JVM (if it's a decent one, like the Sun implementation).
So it's either your database, your driver, your network (dropping packets???), or your application.
The upgrade may just have exposed something that was already there. -
Hello All!
I'm looking for a little help on an exact problem that seems to have been solved here before (but doesn't work for me).
Here's the original archived thread:
https://discussions.apple.com/thread/2631967?start=0&tstart=0
The question asked is exactly the same....
I have a java app for a Speco Technologies DVR. After opening the app, you must type in a rather long url and then click connect. If you enter the url, then quit the app, when you relaunch it, it does not remember the url that had been entered the previous time.
I would like to create a script that will launch the Java app and then input the url (text string). I cannot get this to work.
I've gotten as far as this:
on run
tell application "Finder" to activate open document file "DVRVIEWER(DO_NOT_DELETE).jar" of folder "Applications" of startup disk
delay 5
set myString to "192.168.0.118"
repeat with currentCharacter in every character of myString
tell application "system events"
keystroke currentCharacter
end tell
delay 0.25
end repeat
tell application "system events"
keystroke return
end run
AppleScript has a Syntax Error of "Expected end of line, etc. but found command name."
Does anyone ( taylor.henderson where are you! ) have a fix, or even a better way to do this? Can I edit the existing .jar to have the info directly in there?
I would actually love to add another section in there that fills in the username and password after entering in the IP address!
Just for clarification on how this goes:
Launch .jar.
Window Launches and prompts for IP address
Enter in IP address
Press RETURN
Windows disappears and new window appears and prompts for username and password
Enter Username
Press TAB
Enter Password
Press RETURN
Thank you guys, I'm sure it's easy, but hey, for me Photoshop and Illustrator are a breeze :-0
-AndyTheFiredogHi
andythefiredog wrote:
Is it possible to use similar commands to maximize the java window?
Yes.
You must enable the checkbox labeled "Enable access for assistive devices" in the Universal Access System Preference pane
Add these lines after the last line wich contains "keystroke return"
delay 2
tell (first process whose frontmost is true) to click button 2 of window 1 -- zoom
Here's my test script ( the Speco camera demo), that works without problems here, I use the application "DVRJavaView4.1.jar", this script checks the existence of ui element (more reliable) rather than any delay.
on run
do shell script "/usr/bin/open '/Applications/DVRJavaView4.1.jar'"
tell application "System Events" to tell (first process whose frontmost is true)
repeat until exists window "Please Input DVR address"
delay 1
end repeat
keystroke "millapt.ddns.specoddns.net"
keystroke return
repeat until exists button "OK" of window 1
delay 1 -- wait until the login window is frontmost
end repeat
keystroke "user"
keystroke tab
delay 0.1
keystroke "4321"
delay 0.1
keystroke return
repeat until name of window 1 starts with "DVRJavaView"
delay 1 --wait while the login window is frontmost
end repeat
click button 2 of window 1 -- zoom
end tell
end run -
Using java class and variables declared in java file in jsp
hi everyone
i m trying to seperate business logic form web layer. i don't know i am doing in a right way or not.
i wanted to access my own java class and its variables in jsp.
for this i created java file like this
package ris;
import java.sql.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class NewClass{
public static void main(String args[]){
Connection con = null;
ResultSet rs=null;
Statement smt=null;
try{
Class.forName("com.mysql.jdbc.Driver").newInstance();
con=DriverManager.getConnection("jdbc:mysql:///net","root", "anthony111");
smt=con.createStatement();
rs= smt.executeQuery("SELECT * FROM emp");
while(rs.next()){
String str = rs.getString("Name");
}catch( Exception e){
String msg="Exception:"+e.getMessage();
}finally {
try {
if(con != null)
con.close();
} catch(SQLException e) {}
}next i created a jsp where i want to access String str defined in java class above.
<%--
Document : fisrt
Created on : Jul 25, 2009, 3:00:38 PM
Author : REiSHI
--%>
<%@page import="ris.NewClass"%>
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
"http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JSP Page</title>
</head>
<body>
<h1><%=str%></h1>
</body>
</html>I wanted to print the name field extracted from database by ResultSet.
but it gives error cannot find symbol str.
please help me to find right way to do this.
i am using netbeans ide.Very bad approach
1) Think if your table contains more than one NAMEs then you will get only the last one with your code.
2) Your String is declared as local variable in the method.
3) You have not created any object of NewClass nor called the method in JSP page. Then who will call the method to run sql?
4) Your NewClass contains main method which will not work in web application, it's not standalone desktop application so remove main.
Better create an ArrayList and then call the method of NewClass and then store the data into ArrayList and return the ArrayList.
It should look like
{code:java}
package ris;
import java.sql.*;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
public class NewClass{
public static ArrayList getNames(){
Connection con = null;
ResultSet rs=null;
Statement smt=null;
ArrayList nameList = new ArrayList();
try{
Class.forName("com.mysql.jdbc.Driver").newInstance();
con=DriverManager.getConnection("jdbc:mysql:///net","root", "anthony111");
smt=con.createStatement();
rs= smt.executeQuery("SELECT * FROM emp");
while(rs.next()){
nameList.add(rs.getString("Name"));
return nameList;
}catch( Exception e){
String msg="Exception:"+e.getMessage();
</code><code class="jive-code jive-java"><font>return nameList;</code><code class="jive-code jive-java">
}finally {
try {
if(con != null)
con.close();
} catch(SQLException e) {}
</code><code>return nameList;</code>
<code class="jive-code jive-java"> } -
Use java edition and native edition at same time in a single java app
Hi
I have a situation where I need to use both versions of berkeley Db at the same time. I have an external library that I use that requires the Java edition and my own code that uses the native version. Unfortunately the source code of the library is not available and I don't want to redesign my program to use the Java edition.
Some packages in je.4.0.103.jar and db.jar (version 5.1) contain the same naming structure and same classes eg. com.sleepycat.persist.EntityStore. I removed the duplicated packages in je.4.0.103.jar However it seems that the implementation is slightly different between the two version as I get
java.lang.NoSuchMethodError: com.sleepycat.persist.EntityStore.<init>(Lcom/sleepycat/je/Environment;Ljava/lang/String;Lcom/sleepycat/persist/StoreConfig;)V
When I simply had both versions available my code for the native version kept using the packages from the Java edition and the external library kept on using the native version and as a result I got loads of runtime errors.
So how do I tell them apart. The problem is because both sets of packages have identical names and class names so Java does not know which ones to use. I am using eclipse so maybe there is some option where I can tell certain classes to use certain packages.
Any ideas?Hi,
We don't officially support using BDB and BDB JE from the same JVM process.
It's possible to work around this limitation by creating two [url http://download.oracle.com/javase/1.4.2/docs/api/java/lang/ClassLoader.html] Java Classloaders that load one of the two jar files. When calling BDB or BDB JE methods, the call must be bracketed with calls like this that cause the correct classloader to be used:
ClassLoader saveLoader = Thread.currentThread().getContextClassLoader();
Thread.currentThread().setContextClassLoader(/* specify correct loader for BDB or BDB JE here */);
try {
// do something with BDB or BDB JE
} finally {
Thread.currentThread().setContextClassLoader(saveLoader);
}We are not experts on classloaders and we don't have an example of doing this. We have not done it ourselves, we only know that users have done it.
I hope this helps.
Regards,
Alex Gorrod
Oracle Berkeley DB
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