UseParallelGC not working in Java 7 + JNLP

Hello,
I wrote a program in Java 1.6 and JavaFX 1.3 that used UseParallelGC. I could tell that it was using this GC mode because VisualVM would show constant memory usage. Other GC modes would show memory go up and back down again. The only other one that came close to having near constant memory usage was UseConcMarkSweepGC, but even that one had small hills. The program was a video game so I was looking for near 0 GC delay.
Fast fwd to the present. I rewrote my program in Java 7 and JavaFX 2.x. But now the UseParallelGC VM option does not do anything noticeable, looks like it is using the default GC mode. When I set the GC mode to UseConcMarkSweepGC then the VisualVM output looks like it did in the 1.6 version (small hills). So I can tell that I was setting the JVM arguments correctly.
Here is the JNLP attribute for VM arguments.
- for UseParallelGC....
java-vm-args="-ea -XX:+UseParallelGC -Dprism.dirtyopts=false "
- for UseConcMarkSweepGC....
java-vm-args="-ea -XX:+UseConcMarkSweepGC -Dprism.dirtyopts=false "
In Java 7 is UseParallelGC still supported and if not is there an alternative?
Thank you in advance for any help you may provide.
jose

UseParallelGC might have no effect if it happens to be the default in your computer. Java looks at the computer and uses what it thinks of as reasonable defaults for things. To see default switches in your computer try this:
java -XX:+PrintCommandLineFlags -version
You could also try the new G1 collector, it should be good for some types of applications. Google for "Java 7" G1 or java garbage first.

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I just submitted a bug, and got the following e-mail.
Hope the java guys take a look ...
Full View
Your Report (Review ID: 1990127) - SecurityException from all-permissions app - should be ClassNotFoundException
From:
"[email protected]" <[email protected]>
Add to Contacts
To:     [email protected]
Dear Java Developer,
Thank you for your interest in improving the quality of Java Technology.
Your report has been assigned an internal review ID of 1990127, which is NOT visible on the Sun Developer Network (SDN).
Please be aware that the large volume of reports we receive sometimes prevents us from responding individually to each message.
If the information is determined to be a new Bug or RFE, or a duplicate of a known Bug or RFE, you will receive a followup email containing a seven digit bug number. You may search for, view, or vote for this bug in the Bug Database at http://bugs.sun.com/.
If you just reported an issue that could have a major impact on your project and require a timely response, please consider purchasing one of the support offerings described at http://developers.sun.com/services/.
The Sun Developer Network (http://developers.sun.com) is a free service that Sun offers. To join, visit http://developers.sun.com/global/join_sdn.html.
Thank you for using our bug submit page.
Regards,
Java Developer Bug Report Review Team
Date Created: Wed Mar 02 15:43:52 MST 2011
Type: bug
Customer Name: Reuben Pasquini
Customer Email: [email protected]
SDN ID: catdogboy
status: Waiting
Category: javawebstart
Subcategory: other
Company: http://frickjack.com
release: 6u24
hardware: x86
OSversion: windows_7
priority: 4
Synopsis: SecurityException from all-permissions app - should be ClassNotFoundException
Description:
FULL PRODUCT VERSION :
java version "1.6.0_24"
Java(TM) SE Runtime Environment (build 1.6.0_24-b07)
Java HotSpot(TM) Client VM (build 19.1-b02, mixed mode, sharing)
ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7600]
EXTRA RELEVANT SYSTEM CONFIGURATION :
This is a java bug - I have users on WIndows 7 and XP, and also reported on Apache felix mailing list
A DESCRIPTION OF THE PROBLEM :
The following class, when bundled, signed, and deployed with the .jnlp file below, throws a
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public static class AppRunner implements Runnable {
public void run() {
final StringWriter swriter = new StringWriter();
final PrintWriter pwriter = new PrintWriter( swriter );
pwriter.append( "Class path: " ).append(
System.getProperty( "java.class.path" )
).append( "\n\n-------------------------\n" );
final ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
if ( classLoader instanceof URLClassLoader ) {
pwriter.append( "URLClassLoader:\n" );
for ( URL url : ((URLClassLoader) classLoader).getURLs() ) {
pwriter.append( url.toString() ).append( "\n" );
pwriter.append( "\n--------------------------------\n" );
try {
Class.forName( "bogus.DoesNotExist" );
pwriter.append( "No exception thrown on bogus class load\n" );
} catch ( Exception ex ) {
pwriter.append( "Caught exception loading bogus class: " ).append( ex.toString() ).append( "\n" );
ex.printStackTrace(pwriter);
pwriter.flush();
final JFrame jframe = new JFrame( "Webstart test" );
final JTextArea jtext = new JTextArea( swriter.toString(), 20, 40 );
jframe.add( new JScrollPane( jtext ) );
jframe.pack();
jframe.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
jframe.setVisible(true);
public static void main( String[] args ) {
try {
log.log( Level.INFO, "Launching felix!" );
(new Felix(new HashMap<String, Object>())).start();
Thread.sleep( 2000 );
} catch (Exception ex) {
log.log(Level.SEVERE, "Caught exception", ex);
System.exit(0);
SwingUtilities.invokeLater( new AppRunner() );
REGRESSION. Last worked in version 6
STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
*. Download felix.jar from
http://felix.apache.org
*. Build the following code, sign Toy.jar and felix.jar with your key,
launch with the following .jnlp or something similar ....
package littleware.demo;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.net.URL;
import java.net.URLClassLoader;
import java.sql.Connection;
import java.util.HashMap;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;
import org.apache.felix.framework.Felix;
public class JavaToy {
private static final Logger log = Logger.getLogger( JavaToy.class.getName() );
public static class AppRunner implements Runnable {
public void run() {
final StringWriter swriter = new StringWriter();
final PrintWriter pwriter = new PrintWriter( swriter );
pwriter.append( "Class path: " ).append(
System.getProperty( "java.class.path" )
).append( "\n\n-------------------------\n" );
final ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
if ( classLoader instanceof URLClassLoader ) {
pwriter.append( "URLClassLoader:\n" );
for ( URL url : ((URLClassLoader) classLoader).getURLs() ) {
pwriter.append( url.toString() ).append( "\n" );
pwriter.append( "\n--------------------------------\n" );
try {
Class.forName( "bogus.DoesNotExist" );
pwriter.append( "No exception thrown on bogus class load\n" );
} catch ( Exception ex ) {
pwriter.append( "Caught exception loading bogus class: " ).append( ex.toString() ).append( "\n" );
ex.printStackTrace(pwriter);
pwriter.flush();
final JFrame jframe = new JFrame( "Webstart test" );
final JTextArea jtext = new JTextArea( swriter.toString(), 20, 40 );
jframe.add( new JScrollPane( jtext ) );
jframe.pack();
jframe.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
jframe.setVisible(true);
public static void main( String[] args ) {
try {
log.log( Level.INFO, "Launching felix!" );
(new Felix(new HashMap<String, Object>())).start();
Thread.sleep( 2000 );
} catch (Exception ex) {
log.log(Level.SEVERE, "Caught exception", ex);
System.exit(0);
SwingUtilities.invokeLater( new AppRunner() );
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<jnlp codebase="file:/C:/Users/pasquini/Documents/Code/JavaToy/dist/" href="launch.jnlp" spec="1.0+">
<information>
<title>JavaToy</title>
<vendor>pasquini</vendor>
<homepage href=""/>
<description>JavaToy</description>
<description kind="short">JavaToy</description>
</information>
<update check="always"/>
<security>
<all-permissions/>
</security>
<resources>
<j2se version="1.5+"/>
<jar href="JavaToy.jar" main="true"/>
<jar href="lib/felix-2.0.4.jar"/>
</resources>
<application-desc main-class="littleware.demo.JavaToy">
</application-desc>
</jnlp>
EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Class path: C:\Program Files\Java\jre6\lib\deploy.jar
URLClassLoader:
file:/C:/Users/pasquini/Documents/Code/JavaToy/dist/JavaToy.jar
file:/C:/Users/pasquini/Documents/Code/JavaToy/dist/lib/felix-2.0.4.jar
http://felix.extensions:9/
Caught exception loading bogus class: java.lang.ClassNotFoundException: bogus.DoesNotExist
java.lang.ClassNotFoundException: bogus.DoesNotExist
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at com.sun.jnlp.JNLPClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at littleware.demo.JavaToy$AppRunner.run(JavaToy.java:39)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
ACTUAL -
Class path: C:\\Program Files (x86)\\Java\\jre6\\lib\\deploy.jar
URLClassLoader:
file:/C:/Users/pasquini/Documents/Code/JavaToy/dist/JavaToy.jar
file:/C:/Users/pasquini/Documents/Code/JavaToy/dist/lib/felix-2.0.4.jar
http://felix.extensions:9/
Caught exception loading bogus class: java.lang.SecurityException: Permission denied: http://felix.extensions:9/bogus/DoesNotExist.class
java.lang.SecurityException: Permission denied: http://felix.extensions:9/bogus/DoesNotExist.class
at com.sun.deploy.security.DeployURLClassPath$UrlLoader.getResource(Unknown Source)
at com.sun.deploy.security.DeployURLClassPath.getResource(Unknown Source)
at java.net.URLClassLoader$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(Unknown Source)
at com.sun.jnlp.JNLPClassLoader.findClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.ClassLoader.loadClass(Unknown Source)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at littleware.demo.JavaToy$AppRunner.run(JavaToy.java:39)
at java.awt.event.InvocationEvent.dispatch(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$000(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.awt.EventQueue$1.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
REPRODUCIBILITY :
This bug can be reproduced always.
---------- BEGIN SOURCE ----------
package littleware.demo;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.net.URL;
import java.net.URLClassLoader;
import java.sql.Connection;
import java.util.HashMap;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;
import javax.swing.WindowConstants;
import org.apache.felix.framework.Felix;
public class JavaToy {
private static final Logger log = Logger.getLogger( JavaToy.class.getName() );
public static class AppRunner implements Runnable {
public void run() {
final StringWriter swriter = new StringWriter();
final PrintWriter pwriter = new PrintWriter( swriter );
pwriter.append( "Class path: " ).append(
System.getProperty( "java.class.path" )
).append( "\n\n-------------------------\n" );
final ClassLoader classLoader = Thread.currentThread().getContextClassLoader();
if ( classLoader instanceof URLClassLoader ) {
pwriter.append( "URLClassLoader:\n" );
for ( URL url : ((URLClassLoader) classLoader).getURLs() ) {
pwriter.append( url.toString() ).append( "\n" );
pwriter.append( "\n--------------------------------\n" );
try {
Class.forName( "bogus.DoesNotExist" );
pwriter.append( "No exception thrown on bogus class load\n" );
} catch ( Exception ex ) {
pwriter.append( "Caught exception loading bogus class: " ).append( ex.toString() ).append( "\n" );
ex.printStackTrace(pwriter);
pwriter.flush();
final JFrame jframe = new JFrame( "Webstart test" );
final JTextArea jtext = new JTextArea( swriter.toString(), 20, 40 );
jframe.add( new JScrollPane( jtext ) );
jframe.pack();
jframe.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
jframe.setVisible(true);
public static void main( String[] args ) {
try {
log.log( Level.INFO, "Launching felix!" );
(new Felix(new HashMap<String, Object>())).start();
Thread.sleep( 2000 );
} catch (Exception ex) {
log.log(Level.SEVERE, "Caught exception", ex);
System.exit(0);
SwingUtilities.invokeLater( new AppRunner() );
---------- END SOURCE ----------
CUSTOMER SUBMITTED WORKAROUND :
I can work around the problem by installing the app locally, so web-start is not necessary. I ran into this problem with an app that connects to Oracle via ojdbc6.jar - ojdbc6.jar invokes "Class.forName" to check for optional i18n classes on the class path. The Oracle code correctly handles the correct ClassNotFoundException, but the new SecurityException is breaking my app.
workaround:

Xerces for XSD 1.1 Validation not working in Java Mapping

Hi Experts,
We are trying to use XSD 1.1 (assertion feature) validation for the XML payload in a Java mapping program. But I am getting the following exception:
java.lang.IllegalArgumentException: http://www.w3.org/XML/XMLSchema/v1.1 at javax.xml.validation.SchemaFactory.newInstance(SchemaFactory.java:186)
This is happing for the statement:
SchemaFactory factory = SchemaFactory.newInstance("http://www.w3.org/XML/XMLSchema/v1.1");
The reason (apparently) is because it is not able to instantiate the class org.apache.xerces.jaxp.validation.XMLSchema11Factory , which is the Xerces implementation of the SchemaFactory class.
I have tried following things so far -
1. If I try to validate an xml against an xsd 1.1 schema in a standalone program, it works perfectly fine.
2. If I try to deploy this whole functionality on to the server through an EAR (like an adapter module), there again it works.
3. Also tried this before instantiating the SchemaFactory -
System.setProperty("javax.xml.validation.SchemaFactory:http://www.w3.org/XML/XMLSchema/v1.1","org.apache.xerces.jaxp.validation.XMLSchema11Factory");
4. I tried by creating the Imported Archive objects for all the Xerces jars that we require for validation, within the same SWCV, namespace. But still I get the same exception as above (IllegalArgumentException)
5. The link [http://help.sap.com/saphelp_nw70/helpdata/en/b6/8097f5a5edea4f8dfc87ac87082b22/content.htm ] mentions that we need to place all the necessary jars at location <SAP_J2EE_Engine_install_dir>/cluster/server/bin/ext /. But even after placing the jars there, I get the same exception.
I am not sure how we need to handle this. Has anybody faced a similar situation? Any suggestions?
Regards,
Sudheer

Hi Stefan,
Thanks for the reply.
We are on PI 7.1 SP 06. The standard XML tools from jdk supports only XSD 1.0, as far as I know. And XSD 1.0 does not have the Assert feature (also known as, co-occurrence constraint). More details are provided here - [http://www.ibm.com/developerworks/library/x-xml11pt2/]
To use XSD 1.1, we need a different implementation like Xerces-J. I am not sure how we can use it without external jars. I would like to mention again that I could achieve this by using an adapter module (EAR containing the jars), but I need to do this in Java Mapping (imported archive).
Do you know how we can achieve this in any other way? Any other suggestions welcome.
Thanks & Regards,
Sudheer

Delete and renameto not working in java

guys, i have written a java program that reads file1 into temp file and finally writes into another file. program is working fine with no errors, it even reported that the file is deleted. But actually the file was not deleted and renameto was never successful. could you guys see any problem with file definetion so that delete is not successful. please see code from 6th line from bottm.
public class Mergewrs {public static void main (String[] args) throws IOException {
/* Creates a new instance of mergewrsFile */
     /* Making sure an argument is specified */
     if(args.length > 0)
          String line           = null;
          String policyflag      = null;
          int addCnt          = 0;
          File mergein = new File("c:\\javat\\mergein.dat");
          /* Specifiying input file to be used */
          BufferedReader inFile = new BufferedReader(new FileReader(mergein));
          line = inFile.readLine();
          /* Read all lines in the wrsfile specified */
          while(line != null)
               System.out.println("Process1: ");
               policyflag      = line.substring(0,1);
               // Reads input record from 2 thru 1025
               String actionIndicator = new String();
               if(policyflag != null && policyflag.equalsIgnoreCase("A"))
                    { actionIndicator = "A";
                      addCnt = addCnt+1;
                      process(actionIndicator, line);
               catch(IOException e)
                    {System.err.println("File input error");}
               line = inFile.readLine();
          } //while ends
     } //if ends
public static void process(String actionIndicator, String line) throws IOException
     String line1 = null;
     String templine = null;
     String policyId = null;
     File policyOutfile = new File("c:\\javat\\mergeout.dat");
     File policyOutfileold = new File("c:\\javat\\mergeoutold.dat");
     BufferedReader policyOut = new BufferedReader(new FileReader(policyOutfile));
     File tempfile = new File("c:\\javat\\tempfile.dat");
     BufferedWriter tempout = new BufferedWriter(new FileWriter(tempfile));
     line1 = policyOut.readLine();
     try{
          policyId =line1.substring(150,165);
          while(line1 != null)
          {     policyId =line1.substring(150,165);
               try
                    if(policyId.equals(line.substring(151,166)))
                         { templine =line1.substring(0,151);
                    else { templine=line1;}
                    tempout.write(templine);
                    tempout.newLine();
                    line1 = policyOut.readLine();
               catch (Exception e) {System.err.println("File exception h");}
          } //while ends
          try { tempout.close(); }
          catch (Exception e) { e.printStackTrace();}
          try { policyOut.close(); }
          catch (Exception e) { e.printStackTrace();}
          try
               if(policyOutfile.exists())
                    policyOutfile.delete();
                    tempfile.renameTo(policyOutfile);
          catch (Exception e) {System.out.println("error"); }
}

guys, i have written a java program that reads file1
into temp file and finally writes into another file.
program is working fine with no errors, it even
reported that the file is deleted. But actually the
file was not deleted and renameto was never
successful. could you guys see any problem with file
definetion so that delete is not successful. please
see code from 6th line from bottm.Since you don't actually do anything with the return value how do you know it was successful?

UseParallelGC not working in Java 7 + JNLP

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