HELP - With Object Heap

Hello,
I was wondering if you could help me with my problem. I have recently designed a website that uses the JVM on the server side (http://amazingestate.com) on a shared linux machine. The site was working fine until the owners of the server installed a few new files and I now get errors when running the site.
The java classes run fine from a command prompt but when are called by a cgi I get a �could not reserve enough space for the object heap� error. The java programs are small and don�t require large memory requirements.
I was thinking the error is within the shell script in terms of allocating space for the program. I am not sure how to allocate memory within the shell account at runtime within the cgi wrapper script. The script bellow used to work fine and also run fine when telneting into my account. The error only occurs when running inside a cgi request.
I have also tried the �Xmx and �Xms commands without luck.
I have also tried to test the ulimit which is also set on unlimited.
The following script can be found at
http://amazingestate.com/cgi-bin/publicView/RND10.cgi
which allows the viewing of the error
#!/bin/sh
echo "content-type:text/html"
echo
ulimit
echo "<HTML><BODY>"
echo "</BODY></HTML>"
/usr/java/j2sdk1.4.0/bin/java -server -cp /home/amazing/ss/publicView RND10
Anyones help would be greately appreciated. Thanks for your time.
Dale Miller

You're going to start a new JVM every time you get a page hit? Are you aware of how costly this is (slow and memory-intensive)? This is exactly the type of requirement that Java servlets and server pages (jsps) are designed to take care of. You should consider using these.
Regarding your specific problem, the only thing I could recommend trying are the -Xmx/ms switches, which you seem to have tried.

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\\mio; the first package
\\ MyXlet.java
\\ testo; package with the text
\\ previsioni.TXT
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Hi beker,
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[XleTView]-INFO->XLET started... [mio.StatiXlet]
mio.StatiXlet : Inizializzazione avvenuta!
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ni.TXT (Impossibile trovare il percorso specificato)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:103)
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at xjava.io.FileInputStream.<init>(Unknown Source)
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at net.beiker.xletview.xlet.XletManager.resumeRequest(Unknown Source)
at net.beiker.xletview.xlet.XletManager.run(Unknown Source)
at java.lang.Thread.run(Thread.java:536)
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I am a senior highschool student and although I know Java syntax, I learned with Pascal and other procedural languages so I have a difficult time thinking in OOP concepts (which I will have to learn for college classes). So for practice I went to my college's website and found an assignment on the intro course to programming: [Here are the assignment instructions.|http://www.cs.gsu.edu/knguyen/teaching/2009/spring/csc2010/proj.pdf]
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Just a few comments (not necessarily about OO and in no particular order):
It's probably not worth it to make constants for the letter A or the plus sign. Make constants for values people would not understand:
// Ok
public static final int ANSWER_TO_THE_UNIVERSE = 42;'
// Probably overkill
public static final int FORTY_TWO = 42;
Good job on having DecimalFormat as a regular instance variable rather than static (since it is not thread-safe)
Good job initializing your object in a consistent state (via the ctor). Now, make as many variables final as you can. Immutable objects are good:[www.javapractices.com/topic/TopicAction.do?Id=29]
Not sure why you declared repeat() to return the boxed version of boolean, just use a primitive
You have a run() method but are not implementing Runnable. Not that it is required, but usually when I see run(), I think of threading
This is a matter of style, but you don't need to name the arguments in the ctor differently than the instance variables that get assigned. You can very easily say:
// Note that it is final. Make things immutable when you can.
private final String bar;
public Foo(final String bar) {
// Note: I don't need a different name here. This is purely a matter of personal style.
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Consider a while loop in run() rather than a do-loop. What happens if you get no input the first time around?
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Consider making an object for the arguments that are passed into input. Maybe call it GradeCategory, or whatever.
That new object GradeCategory can have the output() method.
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Consider reworking such that you use an array or a collection of GradeCategory. You might want to then have an add method in your JavaProject. The add method should ensure the total weight of grades does not exceed 100%.
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Alright guys, it is a homework problem but I have definitely put in the work. I believe I have everything right except for the toString method in my Line class. The program compiles and runs but I am not getting the right outcome and I am missing parts. I will post my problems after the code. I will post the assignment (sorry, its long) also. If anyone could help I would appreciate it. It is due on Monday so I am strapped for time.
Assignment:
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a)two diffrent points
b)a point and a slope
!!!write a program that consists of three classes:
1)Point class: all data MUST be private
a)MUST contain the following methods:
a1)public Point(double x, double y)
a2)public double x ()
a3public double y ()
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2)Line class: all data MUST be private
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b1)public Line (Point point1, Point point2)
b2)public Line (Point point1, double slope)
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3)Point2Line class
c1)reads the coordinates of a point and a slope and displays the line equation
c2)reads the coordinates of another point (if the same points, prompt the user to change points) and displays the line equation
***I will worry about the user input later, right now I am using set coordinates
What is expected when the program is ran: example
please input x coordinate of the 1st point: 5
please input y coordinate of the 1st point: -4
please input slope: -2
the equation of the 1st line is: y = -2.0x+6.0
please input x coordinate of the 2nd point: 5
please input y coordinate of the 2nd point: -4
it needs to be a diffrent point from (5.0,-4.0)
please input x coordinate of the 2nd point: -1
please input y coordinate of the 2nd point: 2
the equation of the 2nd line is: y = -1.0x +1.0
CODE::
public class Point{
     private double x = 0;
     private double y = 0;
     public Point(){
     public Point(double x, double y){
          this.x = x;
          this.y = y;
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public class Line
     private double x = 0;
     private double y = 0;
     private double m = 0;
     private double x2 = 0;
     private double y2 = 0;
     public Line()
     public Line (Point point1, Point point2)
          this.x = point1.getX();
          this.y = point1.getY();
          this.x2 = point2.getX();
          this.y2 = point2.getY();
          this.m = slope(point1, point2);
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          this.x = point1.getX();
          this.y = point1.getY();
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          double m1 = (point1.getY() - point2.getY())/(point1.getX() - point2.getX());
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          double temp = this.x- this.x2;
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          Line l = new Line(p, x);
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}My problems:
I dont have the right outcome due to I don't know how to set up the toString in the Line class.
I don't know where to put if statements for if the points are the same and you need to prompt the user to put in a different 2nd point
I don't know where to put in if statements for the special cases such as if the line the user puts in is a horizontal or vertical line (such as x=4.7 or y=3.4)
Edited by: ta.barber on Apr 20, 2008 9:44 AM
Edited by: ta.barber on Apr 20, 2008 9:46 AM
Edited by: ta.barber on Apr 20, 2008 10:04 AM

Sorry guys, I was just trying to be thorough with the assignment. Its not that if the number is valid, its that you cannot put in the same coordinated twice.
public class Line
     private double x = 0;
     private double y = 0;
     private double m = 0;
     private double x2 = 0;
     private double y2 = 0;
     public Line()
     public Line (Point point1, Point point2)
          this.x = point1.getX();
          this.y = point1.getY();
          this.x2 = point2.getX();
          this.y2 = point2.getY();
          this.m = slope(point1, point2);
     public Line (Point point1, double slope)
          this.x = point1.getX();
          this.y = point1.getY();
     public double slope(Point point1, Point point2)//finds slope
          double m1 = (point1.getY() - point2.getY())/(point1.getX() - point2.getX());
          return m1;
     public String toString()
          double temp = this.x- this.x2;
          return this.y + " = " +temp + "" + "(" + this.m + ")" + " " + "+ " + this.y2;
          //y-y1=m(x-x1)
public class Point2Line
     public static void main(String[]args)
          Point p = new Point(3, -3);
          Point x = new Point(10, 7);
          Line l = new Line(p, x);
          System.out.println(l.toString());
}The problem is in these lines of code.
public double slope(Point point1, Point point2) //if this method finds the slope than how would i use the the two coordinates plus "m1" to
          double m1 = (point1.getY() - point2.getY())/(point1.getX() - point2.getX());
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     public String toString()
          double temp = this.x- this.x2;
          return this.y + " = " +temp + "" + "(" + this.m + ")" + " " + "+ " + this.y2;
          //y-y1=m(x-x1)
     }if slope method finds the slope than how would i use the the two coordinates + "m1" to create a the line in toString?

Help with objects, classes, etc...

Im having a little trouble grasping the concept of all of these names. I know that every Java program is a class. Now, is a method what we call in C++ a function? It seems as though this is what it is while reading this book but just want to clarify it. And also, what is a good defninition for an object. I know that parseInt() is an object but does that mean that is is some kind of function/method that was declared or made in a class?

lol ... ok; it's easy to get caught up in the jargon...
A class is a "type" of thing, complete with values which describe the thing and operations that the thing can perform. For instance, a "dog" can be described in terms of its breed, size, markings, and things that it does (eat, do tricks, bark, etc).
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Object oriented programming makes use of this jargon. The act of creating an object from a class description is known as "instantiation".
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So, if I had the class dog, it might look a little like:
public class Dog {
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OK... now back to your question. parseInt() is a static method of class Integer. (therefore, you don't need an instance of Integer in order to call parseInt().
the parseInt() method returns an int.
make sense?

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Hi,
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created and object as below to accomodate the nested table in the object
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you mean like this?
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Is your code valid?
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HTML - http://validator.w3.org/
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Hi DrClap,
I am trying to implement the AbstractTableModel using objects as containers of data. Every thing works till the data is displayed, while setting the data, I am having trouble.
I am using reflection to get the bean getter and setter methods. Also I have restricted the fields displayed using column names passed from config file. Also how do you go about doing data validation? I was thinking more on the lines of column validator classes which do the validation and display the cells having errors with a different color.
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}

swim.setName(swim.getName());would seem to work.
Very odd design though.

Newbie help with Objects

Hi there,
I've been trying to write a program which invokes a few different methods. I was wondering if there is a way of transferring data.. say an integer... from one method to another?
Thanks!

of course there is. that's basically what writing code is all about. start at the beginning and read a basic tutorial
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Hi gurus,
I am not an expert with Java´s configuration, and I have a situation that I don´t understand. First of all, I am working at Centos 6.2 with jdk_1.6 and Tomcat 7.
The problem is...
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Error occurred during initialization of VM
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Could not create the Java virtual machine.
This appear when I run java -version or when I try to stop Tomcat, and the Tomcat isn´t able to stop.
The strange thing is that my server has more than 200M free in physical memory. So, why Tomcat isn´t able to stop? and Why Java doesn´t use the free memory in my server?
Thanks in advanced.

Hello EJP, thanks for your answer.
I have explained bad.
The server has 703M free when Tomcat is stopped. I had mentioned that my server has more than 200M free in physical memory when Tomcat is running with JAVA_OPTS="-Xmx512m", so I don´t understand why these errors appear.
Do you understand me?
Recently I have checked the swap memory, and it is disabled. In spite of swap memory is disabled I think java wouldn´t need this memory because it has free physical memory
Thanks again.

Can't figure out why colors don't totally change when you select type with curser? It looks like it has by looking at it, but when you highlight the area after the old color is still there. It happens with objects to. Driving me NUTZ. Help!

Can't figure out why colors don't totally change when you select type with curser? It looks like it has by looking at it, but when you highlight the area after the old color is still there. It happens with objects to. Driving me NUTZ. Help!

Select the text, and open the Appearance palette (Come on guys, text highlight is irrelevant, it happens to objects too says the OP), and see what's listed there. For a simple text object, there should only be a line item "Type", followed by "Characters", and when double-clicked the Characters line item expands to tell you the stroke and fill color. For a basic object, there should be a fill and/or stroke.
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<y1>36.160352</y1>
<y2>66.48362700000001</y2>
<y3>66.48362700000001</y3>
<y4>96.01235200000002</y4>
</data>
<data>
<x>1216233900</x>
<y1>34.260794</y1>
<y2>62.10649799999999</y2>
<y3>62.10649799999999</y3>
<y4>88.902323</y4>
</data>
<data>
<x>1216234200</x>
<y1>35.329617</y1>
<y2>62.77339099999999</y2>
<y3>62.77339099999999</y3>
<y4>89.30751</y4>
</data>
</series>
</reporting>
The first series element has 4 children
I am able to get the number of data elements as:
"resultObj.reporting.series[0].data.length"
How do I effectively retreive:
"resultObj.reporting.series[0].childNodes().length"
Apparently this does'nt work, I also tried Nodes, children().
Any documentation or help with this would be awesome
Thanks a ton
Pranay

Can someone please help me understand this error maybe?
I would appreciate it
[MessagingError message='Destination 'the destination of an
xml file' either does not exist or the destination has no channels
defined (and the application does not define any default
channels.)']
what are channels?

Java 1.4.1 - Could not reserve space for object heap - need help

I know this problem has been posted before, but I thought this was fixed in release 1.3. I'm using Windows XP/Professional and do the following:
C:java -Xmx2g
Error occured during initialization of VM
Could not reserve space for object heap
C:java -version
java version "1.4.1_02"My computer system has 1 GB of RAM and a 2 GB pagefile, expandable to 3.5 GB. I can get going with -verbose:gc -Xmx1600m -Xms200m, but the GC only gets to about 1 GB before I get an out of memory exception, not even close to 1.6 GB as specified.
I'd really appreciate it if anyone can shed some light on this behavior.
Cheers, Eric

Hmm.
I tried a mini no-operation application with jdk1.3.1 on Linux. It run okay like this:
$ java -Xmx1934M u
$ echo $?
0
$ java -version
java version "1.3.1_07"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1_07-b02)
Java HotSpot(TM) Client VM (build 1.3.1_07-b02, mixed mode)
$ cat u.java
class u {
public static void main(String a[]) {
$This however fails miserably:
$ java -Xmx1935M u
Unexpected Signal : 11 occurred at PC=0x401a0cb7
Function name=start_thread__2osP6Thread
Library=/usr/lib/jdk1.3.1_07/jre/lib/i386/client/libjvm.so
Current Java thread:
Dynamic libraries:
08048000-0804c000 r-xp 00000000 03:08 174723     /usr/lib/jdk1.3.1_07/bin/i386/native_threads/java
0804c000-0804d000 rw-p 00003000 03:08 174723     /usr/lib/jdk1.3.1_07/bin/i386/native_threads/java
40000000-40012000 r-xp 00000000 03:08 20686      /lib/ld-2.2.5.so
40012000-40013000 rw-p 00011000 03:08 20686      /lib/ld-2.2.5.so
...This looks familiar:
$ java -Xmx2000m u
Error occurred during initialization of VM
Could not reserve enough space for object heap

HELP - With Object Heap

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