GUI .jar problems

Hi,

I've been trying to construct a GUI using netbeans. However, today was the 1st time I ran it via the .jar file. The GUI loaded up fine, but the minute I tried to make it load a file and hit next, I got this error:

Code:

---

(Unknown Source)
        at java.awt.Component.processEvent(Unknown Source)
        at java.awt.Container.processEvent(Unknown Source)
        at java.awt.Component.dispatchEventImpl(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.awt.Component.dispatchEvent(Unknown Source)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
        at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
        at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.awt.Window.dispatchEventImpl(Unknown Source)
        at java.awt.Component.dispatchEvent(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)

---

The place I got this error is within a Jtextarea where I display the console System output. The irnonic thing is that it does do what its supposed to (loads data into a mySQL table), but it gives me this problem. And I have no idea why.

Before, it was giving me a slightly different error when I was using setCursor, I erased that part of the code hoping that it was giving the error. But unfortunately not ....
Despite that output, I am able to go around the other features of my GUI. But the output message in the textarea never gets updated, it stays the same as above. Even though, it should as I perform different functions ...

The code that enables my to throw the system console outputs into the Jtextarea:

Code:

---

    import java.awt.*;
    import java.io.*;
    import javax.swing.*;

    public class SystemConsole extends JFrame {
        PipedInputStream piOut;
        PipedInputStream piErr;
        PipedOutputStream poOut;
        PipedOutputStream poErr;
        JTextArea systemConsole;

        public SystemConsole(JTextArea systemOutput ) throws IOException {

            systemConsole=systemOutput;

            // Set up System.out
            piOut = new PipedInputStream();
            poOut = new PipedOutputStream(piOut);
            System.setOut(new PrintStream(poOut, true));

            // Set up System.err
            piErr = new PipedInputStream();
            poErr = new PipedOutputStream(piErr);
            System.setErr(new PrintStream(poErr, true));
         
            // Create reader threads
            new ReaderThread(piOut).start();
            new ReaderThread(piErr).start();
        }

        class ReaderThread extends Thread {
            PipedInputStream pi;

            ReaderThread(PipedInputStream pi) {
                this.pi = pi;
            }

            public void run() {
                final byte[] buf = new byte[1024];
                try {
                    while (true) {
                        final int len = pi.read(buf);
                        if (len == -1) {
                            break;
                        }
              SwingUtilities.invokeLater(new Runnable() {
                            public void run() {
                                systemConsole.append(new String(buf, 0, len));

                                // Make sure the last line is always visible
                                systemConsole.setCaretPosition(systemConsole.getDocument().getLength());

                                // Keep the text area down to a certain character size
                                int idealSize = 1000;
                                int maxExcess = 500;
                                int excess = systemConsole.getDocument().getLength() - idealSize;
                                if (excess >= maxExcess) {
                                    systemConsole.replaceRange("", 0, excess);
                                }
                            }
                        });
                    }
                } catch (IOException e) {
                }
            }
        }
    }

---

do you have JARs for libraries you are using, perhaps SwingWorker?

Hey postmortem,

I do have a few jars that I use in my lib folder. I created the project via Netbeans so it auto creates a .jar file within the dist folder.

Dist
-- .jar file
-- lib
------ JDBC

However, there isn't a jar for SwingWorker.

Thanks a lot for your reply! I've been trying various things but nothing seems to work. I'll look into an alternative way of creating my .jar file ....

2 More Questions :

Q1 : The TextArea where the output comes seems to be "eating" some of the text, Eg: If it had to say Database user created, it says tabase user created. The code, above is the one that creates the system console within the textarea. I'm not sure what could be going wrong.

Q2 : When the user presses the "X" button on my Jframe, the application closes. Fair enough. I know it does this because of setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);. However, I want it to perform another function before closing. I want it to save the stuff by calling a fucntion saveSession(). How would, I go about doing this. Would I need to set the setDefaultCloseOperation to Do noting on close and then create my own close method?

When the file is loading, if I call setCursor and set it to wait. The error msg changes slightly: It becomes:

Code:

---

Button$Handler.actionPerformed(Unknown Source)
        at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
        at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
        at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
        at java.awt.Component.processMouseEvent(Unknown Source)
        at javax.swing.JComponent.processMouseEvent(Unknown Source)
        at java.awt.Component.processEvent(Unknown Source)
        at java.awt.Container.processEvent(Unknown Source)
        at java.awt.Component.dispatchEventImpl(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.awt.Component.dispatchEvent(Unknown Source)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
        at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
        at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.awt.Window.dispatchEventImpl(Unknown Source)
        at java.awt.Component.dispatchEvent(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)

---

However, when I added SwingWorker 1.2 as an external jar to the project, this is what I get:

Code:

---

java.awt.LightweightDispatcher.processMouseEvent(Unknown Sourc        at java.awt.LightweightDispatcher.processMouseEvent(Unk        a        at java.awt.LightweightDispatcher.processMouseEvent(Unk        a        at java.awt.LightweightDispatcher.processMouseEvent        a        at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
        a        at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
        at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.awt.Window.dispatchEventImpl(Unknown Source)
        at java.awt.Component.dispatchEvent(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)

---

Quote:

---

Originally Posted by worldChanger

Q2 : When the user presses the "X" button on my Jframe, the application closes. Fair enough. I know it does this because of setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);. However, I want it to perform another function before closing. I want it to save the stuff by calling a fucntion saveSession(). How would, I go about doing this. Would I need to set the setDefaultCloseOperation to Do noting on close and then create my own close method?

---

Try putting a WindowListener on your frame (e.g. a subclass of WindowAdapter). You can override the windowClosed(..) notification method to do any last-minute stuff.

Any programming problem can be solved by adding a level of indirection...
Anon.

Hey dlorde - Thanks, that worked perfectly. Any suggestions as to why I'm getting these error msges for my GUI though?

I've tried almost everthing that I think might have hindered it. I disabled the system output from showing in the textarea, but still no avail. I'm using Cardlayouts for a panel in my GUI. Could this be a problem?

Based on the msges it seems that I might be missing the library for AWT and Swing, I guess.

I was searching to download swingall.jar on Google, but unfortunately, I can't find it anywhere to include it into my library path. I however found SwingLayout-1.0.1 at http://www.findjar.com/jar/net.java....1.0.1.jar.html, I included it within my library but it still doesn't work.

AWT doesn't seem to have any .jar files that I could include in my libraries. I just think that this is probably just a library issue. There's one that I'm not including ... I used the Netbeans GUI Editor to make the GUI ...

Ah, I'm out of ideas guys ... can anyone give me some ideas? The GUI runs perfectly when I run it as a project in Netbeans ... but acts up when its executed via its .jar file. I haven't moved the jar file. I run it in the same palce where Netbeans creates it.

Currently the libraries include :
-swing Worker
- App Frame work
- JDBC

Quote:

---

Originally Posted by worldChanger

There's one that I'm not including ... I used the Netbeans GUI Editor to make the GUI ...

---

If you used any non-Swing components, you'll have to include the jar for them. Most of us tend to avoid using GUI builders for anything non-trivial because they generally tie you to a particular IDE by producing a mass of otherwise unmaintainable code.

If you use a GUI builder, you really ought to find out what it involves - I'm sure there must be Netbeans help files or docs that will tell you what libraries you need. Look for 'How To Deploy GUI Applications' or something similar.

Computer Science is a science of abstraction -creating the right model for a problem and devising the appropriate mechanizable techniques to solve it...
A. Aho and J. Ullman

Hi dlorde,

Quote:

---

The following JAR files might be needed by your deployed applications:

swing-layout-1.0.3.jar. This library contains the various layout-related extensions, such as the GroupLayout layout manager. This library is included in version 6 of the Java Platform, so you do not need to package it with your application if you are deploying it to environments that have version 6 of the JRE.

appframework-1.0.3.jar and swing-worker-1.1.jar. These libraries represent the Swing Application Framework. They are needed if you use the Java Desktop Application template in creating your application. As of JDK 6, the Swing Application Framework is not part of the Java Platform.

Beans Binding. This library contains support for the beans binding. If your application is created with the Database shell of the Java Desktop Application template or you have used the Bind dialog box in creating your application, your application needs this library. As of JDK 6, the Beans Binding library is not part of the Java Platform.

---

That was the information within the help file. I included all these libaries, however the error still remains.

I tried running the program using ANT based on a friends advice, and surprisingly it runs perfectly fine. So, I just browse to the project folder and type in ant run via command prompt and it works great. That's quite surprising ...

However, I want to eliminate the use of needing anything other than the .jar file to run. So I'm going to look-up on how I can use ANT to build a stand-alone .jar file. I hope this can be done?

Yes, Ant can build a stand-alone jar file - it's what Netbeans uses to build jars - as you will probably already know, having read the Netbeans help docs on deploying a jar file outside the IDE and managing the classpath. You can even change the Ant script from within Netbeans - see the help docs on customising the Ant script.

Time is an excellent teacher; but eventually it kills all its students...
Anon.

Quote:

---

I tried running the program using ANT based on a friends advice, and surprisingly it runs perfectly fine. So, I just browse to the project folder and type in ant run via command prompt and it works great. That's quite surprising ...

---

Presumably the ant build file has a target called 'run' that is setting the classpath to the correct values when starting the jar.

If you find the ant build file (probably called build.xml) and look at the target called 'run' you will be able to see what the classpath settings are. You need to take these settings and add them to the manifest file used when building the jar. They will need to be on a line starting 'Class-Path:' and ending with a newline.

I'm not a Netbeans expert but I believe you can do all this from within NetBeans. Check the help system for creating your own manifest files.

Quote:

---

Yes, Ant can build a stand-alone jar file - it's what Netbeans uses to build jars - as you will probably already know, having read the Netbeans help docs on deploying a jar file outside the IDE and managing the classpath. You can even change the Ant script from within Netbeans - see the help docs on customising the Ant script.

---

Thanks dlorde, will read up on this ASAP.

Quote:

---

Presumably the ant build file has a target called 'run' that is setting the classpath to the correct values when starting the jar.

If you find the ant build file (probably called build.xml) and look at the target called 'run' you will be able to see what the classpath settings are. You need to take these settings and add them to the manifest file used when building the jar. They will need to be on a line starting 'Class-Path:' and ending with a newline.

I'm not a Netbeans expert but I believe you can do all this from within NetBeans. Check the help system for creating your own manifest files.

---

Hey Keang - Few things I noticed:

*When, I do ant run. It automatically deletes a folder created by netbeans called dist that has the standalone .jar file as well as lib folder that contain the required libraries
*The build.xml folder doesn't seem to have any relevant code its entirely full of comments. However, it imports a file called build-impl.xml that has uncommented code. This looked relevant to me, but it doesn't list the path to the class-path ... or maybe I'm blind!

Code:

---

  ====================
                JAR BUILDING SECTION
                ====================
           
  -->
- <target depends="init" name="-pre-pre-jar">
  <dirname file="${dist.jar}" property="dist.jar.dir" />
  <mkdir dir="${dist.jar.dir}" />
  </target>
- <target name="-pre-jar">
- <!--  Empty placeholder for easier customization.
  -->
- <!--  You can override this target in the ../build.xml file.
  -->
  </target>
- <target depends="init,compile,-pre-pre-jar,-pre-jar" name="-do-jar-without-manifest" unless="manifest.available">
  <j2seproject1:jar />
  </target>
- <target depends="init,compile,-pre-pre-jar,-pre-jar" if="manifest.available" name="-do-jar-with-manifest" unless="manifest.available+main.class">
  <j2seproject1:jar manifest="${manifest.file}" />
  </target>
- <target depends="init,compile,-pre-pre-jar,-pre-jar" if="manifest.available+main.class" name="-do-jar-with-mainclass" unless="manifest.available+main.class+mkdist.available">
- <j2seproject1:jar manifest="${manifest.file}">
- <j2seproject1:manifest>
  <j2seproject1:attribute name="Main-Class" value="${main.class}" />
  </j2seproject1:manifest>
  </j2seproject1:jar>
  <echo>To run this application from the command line without Ant, try:</echo>
  <property location="${build.classes.dir}" name="build.classes.dir.resolved" />
  <property location="${dist.jar}" name="dist.jar.resolved" />
- <pathconvert property="run.classpath.with.dist.jar">
  <path path="${run.classpath}" />
  <map from="${build.classes.dir.resolved}" to="${dist.jar.resolved}" />
  </pathconvert>
  <echo>${platform.java} -cp "${run.classpath.with.dist.jar}" ${main.class}</echo>
  </target>
- <target depends="init,compile,-pre-pre-jar,-pre-jar" if="manifest.available+main.class+mkdist.available" name="-do-jar-with-libraries">
  <property location="${build.classes.dir}" name="build.classes.dir.resolved" />
- <pathconvert property="run.classpath.without.build.classes.dir">
  <path path="${run.classpath}" />
  <map from="${build.classes.dir.resolved}" to="" />
  </pathconvert>
- <pathconvert pathsep="" property="jar.classpath">
  <path path="${run.classpath.without.build.classes.dir}" />
- <chainedmapper>
  <flattenmapper />
  <globmapper from="*" to="lib/*" />
  </chainedmapper>
  </pathconvert>
  <taskdef classname="org.netbeans.modules.java.j2seproject.copylibstask.CopyLibs" classpath="${libs.CopyLibs.classpath}" name="copylibs" />
- <copylibs compress="${jar.compress}" jarfile="${dist.jar}" manifest="${manifest.file}" runtimeclasspath="${run.classpath.without.build.classes.dir}">
  <fileset dir="${build.classes.dir}" />
- <manifest>
  <attribute name="Main-Class" value="${main.class}" />
  <attribute name="Class-Path" value="${jar.classpath}" />
  </manifest>
  </copylibs>
  <echo>To run this application from the command line without Ant, try:</echo>
  <property location="${dist.jar}" name="dist.jar.resolved" />
  <echo>${platform.java} -jar "${dist.jar.resolved}"</echo>
  </target>
- <target name="-post-jar">
- <!--  Empty placeholder for easier customization.
  -->
- <!--  You can override this target in the ../build.xml file.
  -->
  </target>
  <target depends="init,compile,-pre-jar,-do-jar-with-manifest,-do-jar-without-manifest,-do-jar-with-mainclass,-do-jar-with-libraries,-post-jar" description="Build JAR." name="jar" />

---

*Oh and Netbeans creates its own Manifest file with the project but all its contents include are:

Code:

---

Manifest-Version: 1.0
X-COMMENT: Main-Class will be added automatically by build

---

-----

Thanks A LOT for your replies guys, I'm going to do some more reading up on this and hope to solve this problem. I was extremely relieved to realize that ANT works at least, which probably means the project is okay.

are you running java 6 or 5? netbeans has option to create swing layout extensions as java 6 code or import from swing layout.

Quote:

---

Note: If you create your application using JDK 6 but you need the application to also run on Java SE 5, you can have the IDE generate its code to use the Swing Layout Extensions library instead of the classes in Java SE 6. Open the ContactEditorUI class in the GUI Editor. In the Inspector, expand the ContactEditorUI node and choose Form ContactEditorUI. In the Properties window, change the value of the Layout Generation Style property to Swing Layout Extensions Library.

---

http://www.netbeans.org/kb/60/java/quickstart-gui.html

Hey postmortem - That didn't solve it man.

So, here is what happens:

Code:

---

private void addActionPerformed(java.awt.event.ActionEvent evt) {                                         


            // Setting the busy cursor
            topAndConsoleSplit.setCursor(new Cursor(Cursor.WAIT_CURSOR));
           
//Long function reads a file and adds data to mysql
addToMySQL();

                    //Resetting back to the normal curson
            topAndConsoleSplit.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));

---

The cursor doesn't reset and always stays busy after the button has been pressed (Action fired). I was reading around and this is a common issue, I think I need to create a new "thread" for the function that adds the dataToMySQL?

if you add new function, then changing cursor will have to be done from GUI thread, not from newly created thread.

Coding Tip:
When temporarily changing the cursor you should wrap the code between the setCursor calls in a try clause and add the code changing the cursor back to the original value to a finally clause.

If you don't do this and your code throws a non-fatal exception the application will continue but the cursor will not be changed back to the original cursor. In your case the cursor will remain as the wait cursor which is very annoying and confusing for the user.

Another coding tip:
Unless you're defining your own cursor types, it's more efficient to use the pre-defined cursors than create new ones:

Code:

---

Cursor waitCursor = Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR);

---

The best is the enemy of the good...
Voltaire

Quote:

---

Originally Posted by postmortem

if you add new function, then changing cursor will have to be done from GUI thread, not from newly created thread.

---

Hey postmortem - Can you give me an example of how I would go about using the GUI thread? Isn't it the same as a default thread?

Oh, I wasn't trying to change the cursor in a new thread, I was trying to add the addToMySQL function to the new thread. This is because after I click the button, it gets stuck to the wait cursor but it doesn't add anything to the mySQL table as it is supposed to with the function.

@ Keang - Thanks for the tip! I did enclose my code within a try/catch block. Now it changes the cursor back to the deafault cursor. But it still doesn't execute my function when I'm trying to run it through the .jar file. It executes it when running it via netbeans though. Additionally, I'm very certain that all the libraries are included this time.

Code:

---


                try {    // Setting the busy cursor
            topAndConsoleSplit.setCursor(new Cursor(Cursor.WAIT_CURSOR));
            addToMySQL();

            } catch (Exception cursorChange) {
                System.out.println(" -- " + cursorChange.getMessage());
            }

            finally { //Resetting back to the normal curson
            topAndConsoleSplit.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
            }

---

Do you get any exceptions? I would expect that if a required class or resource is not available, you'd get an exception thrown when you try to create or access or use it. Check your code to make sure you are not ignoring possible exceptions with empty catch blocks.

If all the required libraries are included, yet a class or resource in one of those libraries isn't available, it is probably a problem with the manifest file. See Working With Manifest Files.

The outcome of any serious research can only be to make two questions grow where only one grew before...
T. Veblen

Hey dlorde - Nopes, it isn't throwing an exception. The weird thing is that it adds it within Netbeans, but not when I add it using the standalone .jar.

The reason, I said that the class / libraries were fine is that I call a similar function that updates the mySQL table on another feature of the GUI and that works flawlessly. But when I try to execute this ... it doesn't add anything to mySQL.

Sorry - another small problem I am facing seperate from the .jar file is that. I am trying to add a JFrame that opens up on a mouse click event within a Jtable of my GUI.

Code:

---

if (e.getClickCount() == 1 && column==3 && !Table.getValueAt(row, 3).toString().isEmpty() ) {

                               
                                //Creating the JTable
                                JScrollPane getPlane = new JScrollPane();
                                JTable getTable = new JTable();
                                getPlane.add(getTable);
                      DefaultTableModel getTableModel = new DefaultTableModel(header, 1);

                        getTable.setModel(getTableModel);

                                //Create and set up the window.
                                JFrame frame1 = new JFrame();
                                frame1.add(getPlane);
                                //Display the window.
                                frame1.pack();
                                frame1.setVisible(true);
                                frame1.repaint();

}

---

With that code, I get the Frame to open up. But I've inserted some data into the table. That doesn't display , nor do the table headers. Any ideas? I can include the code that I used to fill the table but I guess that would just make it kinda messy.


EDIT : I got it to work!

Just can't figure out how to make the Jframe take the exact size of the Jtable. Any suggestions? . I don't want to manually set a preferred size, cause the table might be bigger or smaller based on the data.

you can predesign new frame and its contents in netbeans as new class, then simply instantiate it

Quote:

---

Just can't figure out how to make the Jframe take the exact size of the Jtable. Any suggestions?

---

call getSize() on the JTable object and then pass the returned value to the JFrames object's setSize() method. If you want the internal size of the JFrame to be the same size of the JTable rather than the external size, then you'll have to add the JFrames insets to the size returned by JTable.

Why put the table in a scroll frame if you never want to scroll it? The scroll frame deliberately makes the size of the frame independent of the size of the table, so large tables can be displayed in smaller frames and scrolled.

If you want the frame to size itself to the table, just add the table directly the frame (or add it to a panel and add that to the frame). When you pack() the frame, it will size itself to the table.

If you want to show the table headers like a scroll pane does, you can do it like this:

Code:

---

...
JTableHeader header = table.getTableHeader();
panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
panel.add(header);
panel.add(table);
frame.add(panel);
frame.pack();
frame.setVisible(true);
...

---

It is a bad plan that admits of no modification...
P. Syrus

Hey keang - Wow, so simple. Yet so ingenius.

dlorde - I think the pack() did the trick, it displays it as I want to now. I still do have the scrollpane, I just didn't want it to become the entire size of the screen if the table was that big. The presence of the scrollpane is preventing that.

Going to get back to figuring out how to get the .jar file to work independently ...

Hmm, I just realized something.

The first file that I'm trying to load into mySQL is around 2.5 mb in size. The others are smaller. So I reduced this to around 700 kb and tried the function again and it worked, this time!

This is what I concluded. All the libraries and everything are working perfectly. I'm guessing its probably just running out of memory when its trying to load the larger file? or maybe mysql cannot handle those many entries being put? But, while I build the project I assigned sufficient heap space to it I guess, I used -Xmx1024m. And with this same setting, it can add the 2.4 mb file when running the project in netbeans ...

run your app insider netbeans via profiler, it is integrated with netbeans, it will tell you actual mem usage

you can see it from task manager too

Hey postmortem - I ran the profiler as you suggested. Initially it didn't let me run it with my specified parameter of -Xmx1024m . So, I removed this and ran the default. (I read that the default uses 1/4th of the entire system memory .. mine is 3 Gbs). The application then opened fine but as soon as I ran the feature that adds the file to mySQL, here's what I get:

Code:

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init:
profile-init:
deps-jar:
compile:
profile:
Profiler Agent: Waiting for connection on port 5140, timeout 10 seconds (Protocol version: 8)
Profiler Agent: Established local connection with the tool
java.lang.OutOfMemoryError: Java heap space
Dumping heap to D:\nbproject\private\profiler\java_pid2532.hprof ...
Heap dump file created [76486386 bytes in 2.791 secs]
Exception in thread "AWT-EventQueue-0" java.lang.OutOfMemoryError: Java heap space
        at java.lang.Float.toString(Float.java:182)
        at java.lang.String.valueOf(String.java:2960)
        at com.mysql.jdbc.PreparedStatement.setFloat(PreparedStatement.java:3239)

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I've attached an image of the view I get:

The spike that you see in the first graph from around 70 to 120 is when I add call my function to add the file to mySQL. Ironically, it adds it fine using the profiler. But it doesn't work with the jar. I guess, its unable to allocate the required memory when I'm running the program via .jar? And maybe the Profiler is intelligent enough to allow it to do so?

Quote:

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Originally Posted by worldChanger

(I read that the default uses 1/4th of the entire system memory .. mine is 3 Gbs).

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Where did you read that?

This is what the Sun Hotspot JVM FAQ says:

What are the default heap sizes for 64-bit VMs if GC ergonomics is not used?
The default heap size for all 32-bit J2SE implementations is 64MB. We have adjusted the defaults for 64-bit implementations to be 30% larger in order to make up for the increased size of Java objects due to larger native pointers. Remember that Java objects contain class and lock pointers so even if you create Java objects which contain only integers, each object takes up additional memory.

How large a heap can I create using a 64-bit VM?
On 64-bit VMs, you have 64 bits of addressability to work with resulting in a maximum Java heap size limited only by the amount of physical memory and swap space your system provides.

The maximum theoretical heap limit for the 32-bit JVM is 4G. Due to various additional constraints such as available swap, kernel address space usage, memory fragmentation, and VM overhead, in practice the limit can be much lower. On most modern 32-bit Windows systems the maximum heap size will range from 1.4G to 1.6G. On 32-bit Solaris kernels the address space is limited to 2G. On 64-bit operating systems running the 32-bit VM, the max heap size can be higher, approaching 4G on many Solaris systems.

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