3-Dimensional Arrays?!?

I've got a lab project that requires me to read in questionnaire data (3 integers) from a file, then put those integers into
a 3-Dimensional array. Here's the idea:
int [][][] poll = new int [4][3][2]; // 4 Age Ranges, 3 Opinions, 2 Genders
int readAge=0, readOpinion=0, readSex=0;
// Read data from file
readAge = scan.nextInt();
readOpinion = scan.nextInt();
readSex = scan.nextInt();
// Store Age, Opinion, Sex into 3D array.
poll[i][j][k] = poll[readAge][readOpinion][readSex]; // ????
Do I need to use a nested for loop (i,j,k) to access and assign this?
How do I put those values into the array?
What's the best way to visualize 3d arrays?

Erotomania247 wrote:
I understand 2D arrays ( int [][] array is basically array[row][column]) and how that references the x, y coords of the location in the array,
but I don't understand how I am referencing the 3rd dimension. If we take a 2D array and add the 3rd dimension is this the correct idea?
http://i64.photobucket.com/albums/h162/rush75/arrays.jpg
So we have rows and columns for the 2d array, but What is the 3rd dimension called?How about "Fred". Rows and columns are just names and nothing more. It doesn't matter what you call it, as long as you can see it. The names will all change depending on the context. Have you ever played a 3-D game such as 3-D tic tac toe (using a 4x4x4 grid)? Then you're visualizing in 3 D. Have you ever looked at a blue print for a multi-floored house? Each floor is laid out in it's own little graph, and each floor is the extension of these graphs into the third dimension.
I don't think anyone is going to be able to really explain this to you. I think that you are going to have to just use it and think on it a lot. If you keep at it, you will understand. You might want to look into a very small book on dimensions called "Flatland: a Romance in Many Dimensions" by Edwin Abbott. This is a classic book (booklet?) on visualizing 1, 2, 3 (more...) dimensions, and only costs $3.99 on Amazon.com.
Good luck!
Pete

Similar Messages

How can I (neatly) control mouse click events in a multi-dimensional array?

Hello everyone!
     I have a question regarding the use of mouse clicks events in a multi-dimensional array (or a "2D" array as we refer to them in Java and C++).
Background
     I have an array of objects each with a corresponding mouse click event. Each object is stored at a location ranging from [0][0] to [5][8] (hence a 9 x 6 grid) and has the specific column and row number associated with it as well (i.e. tile [2][4] has a row number of 2 and a column number of 4, even though it is on the third row, fifth column). Upon each mouse click, the tile that is selected is stored in a temporary array. The array is cleared if a tile is clicked that does not share a column or row value equal to, minus or plus 1 with the currently targeted tile (i.e. clicking tile [1][1] will clear the array if there aren't any tiles stored that have the row/column number
[0][0], [0][1], [0][2],
[1][0], [1][1], [1][2],
[2][0], [2][1], [2][2]
or any contiguous column/row with another tile stored in the array, meaning that the newly clicked tile only needs to be sharing a border with one of the tiles in the temp array but not necessarily with the last tile stored).
Question
     What is a clean, tidy way of programming this in AS3? Here are a couple portions of my code (although the mouse click event isn't finished/working correctly):
public function tileClick(e:MouseEvent):void
   var tile:Object = e.currentTarget;
   tileSelect.push(uint(tile.currentFrameLabel));
   selectArr.push(tile);
   if (tile.select.visible == false)
    tile.select.visible = true;
   else
    tile.select.visible = false;
   for (var i:uint = 0; i < selectArr.length; i++)
    if ((tile.rowN == selectArr[i].rowN - 1) ||
     (tile.rowN == selectArr[i].rowN) ||
     (tile.rowN == selectArr[i].rowN + 1))
     if ((tile.colN == selectArr[i].colN - 1) ||
     (tile.colN == selectArr[i].colN) ||
     (tile.colN == selectArr[i].colN + 1))
      trace("jackpot!" + i);
    else
     for (var ii:uint = 0; ii < 1; ii++)
      for (var iii:uint = 0; iii < selectArr.length; iii++)
       selectArr[iii].select.visible = false;
      selectArr = [];
      trace("Err!");

Andrei1,
     So are you saying that if I, rather than assigning a uint to the column and row number for each tile, just assigned a string to each one in the form "#_#" then I could actually just assign the "adjacent" array directly to it instead of using a generic object to hold those values? In this case, my click event would simply check the indexes, one at a time, of all tiles currently stored in my "selectArr" array against the column/row string in the currently selected tile. Am I correct so far? If I am then let's say that "selectArr" is currently holding five tile coordinates (the user has clicked on five adjacent tiles thus far) and a sixth one is being evaluated now:
Current "selectArr" values:
       1_0
       1_1, 2_1, 3_1
              2_2
New tile clicked:
       1_0
       1_1, 2_1, 3_1
              2_2
              2_3
Coordinate search:
       1_-1
0_0, 1_0, 2_0, 3_0
0_1, 1_1, 2_1, 3_1, 4_1
       1_2, 2_2, 3_2
              2_3
     Essentially what is happening here is that the new tile is checking all four coordinates/indexes belonging to each of the five tiles stored in the "selectArr" array as it tries to find a match for one of its own (which it does for the tile at coordinate 2_2). Thus the new tile at coordinate 2_3 would be marked as valid and added to the "selectArr" array as we wait for the next tile to be clicked and validated. Is this correct?

How can I use two single-dimensional arrays-one for the titles and array

I want to Use two single-dimensional arrays-one for the titles and one for the ID
Could everyone help me how can i write the code for it?
Flower
public class Video
public static void main(String[] args) throws Exception
int[][] ID =
{ {145,147,148},
{146,149, 150} };
String[][] Titles=
{ {"Barney","True Grit","The night before Christmas"},
{"Lalla", "Jacke Chan", "Metal"} };
int x, y;
int r, c;
System.out.println("List before Sort");
for(c =0; c< 3; ++c)
for(r=0; r< 3; ++ r)
System.out.println("ID:" + ID[c][r]+ "\tTitle: " + Titles[c][r]);
System.out.println("\nAfter Sort:");
for(c =0; c< 3; ++c)
for(r=0; r< 3; ++ r)
System.out.println("ID:" + ID[c][r]+ "\tTitle: " + Titles[c][r]);

This is one of the most bizarre questions I have seen here:
public class Video
public static void main(String[] args) throws Exception
int[] ID = {145,147,148, 146,149, 150};
String[] Titles= {"Barney","True Grit","The night before Christmas", "Lalla", "Jacke Chan", "Metal"};
System.out.println("List before Sort");
for(int i = 0; i < Titles.length; i++)
System.out.println("ID:" + ID[i]+ "\tTitle: " + Titles);
System.out.println("\nAfter Sort:");
for(int i = 0; c < Titles.length; i++)
System.out.println("ID:" + ID[i]+ "\tTitle: " + Titles[i]);
Generally you don't use prefix (++c) operators in you for loop. Use postfix (c++).
Prefix means that it will increment the variable before the loop body is executed. Postfix will cause it to increment after.

How to get number of rows and columns in a two dimensional array ?

Hello,
What would be the simplest way to get number of rows and columns in a two dimensional array represented as integers ?
I'm looking for another solution as For...Each loop in case of large arrays.
Regards,
Petri

Hi Petri,
See a attached txt file for obtaining two arrays with upper and lower index values
Regards
Ray
Regards
Ray Farmer
Attachments:
Get2DArrayIndex.txt ‏2 KB

Assigning values to 2D Multi-Dimensional arrays ??

How do I assign a value to a Multi-dimensional 2D Array,
that has the righter array size omitted as it changes�.
Code�
SomeObj foobar = new SomeObj (first, second);
SomeObj [ ] [ ] d2D = new SomeObj [10] [ ];
d2D [0][0] = foobar;     //Causes a null pointer exception�
NB: seems if I initiate �d2D = new SomeObj [10] [10];� with the righter array size initiated then the error doesn�t occur, but because of the nature of the data the size of each secondary array varies�
Thx. Kharsim

apparently not...
from what i read up on Multi-Dimensional arrays, you only have to give a value to the leftest bracket...
e.g.
int [ 5 ] [     ] [     ] <~ Acceptable in Java
int [ 5 ] [ 6 ] [     ] <~ Acceptable in Java
int [ 5 ] [ 6 ] [ 24 ] <~ Acceptable in Java
int [ 5 ] [     ] [ 24 ] <~ Not acceptable in Java
so using arrays it should be possible to assign a value in either of the acceptable cases, but couldnt find a source that had such an example...

Populating ADF Table from Multi-Dimensional Array

Hello!
I'm trying to populate an ADF table from a multi-dimensional array.
Let's say that my array is
String [] [] myArr = new String [3][5].
On my page backing bean, I have a private attribute called tmpArr like this...
String [] [] tmpArr;
...which I will initialize later after I know the proper dimensions. The dimensions will come from a multimap that contains a key and and another array (for the key's value) containing values for the key. So once I know the dimensions I initialize my array with...
tmpArr = new String [x][y] where x and y are the dimensions (counters).
Now I have my multidimension array. On an jsp page I have an ADF table, and I'm setting the value for the table to the array (the table's value property is bound to the backing bean's tmpArr attribure).
Like so:
<af:panelForm id="availableOptions"
binding="#{myBackingBean.availableOptionsValues}">
<af:table emptyText="No items were found" rows="10"
value="#{myBackingBean.tmpArr}" var='myArr'>
Now I need to know how to do the following:
1) Set the table's columns based on the number of attributes on the array.
2) Set the table's rows based on the array's length.
3) Set each table cell value to values on the array's 2nd dimension. I'm assuming that ADF takes care iterating through the array, and that I should do something like...
<af:outputText value="#{myArr[][0]}"/>
<af:outputText value="#{myArr[][1]}"/>
etc...
However, this isn't working...
javax.faces.el.ReferenceSyntaxException: myArr[][0]
...bla bla bla...
Was expecting one of:
<INTEGER_LITERAL> ...
<FLOATING_POINT_LITERAL> ...
<STRING_LITERAL> ...
"true" ...
"false" ...
"null" ...
"not" ...
"empty" ...
<IDENTIFIER> ...
Is there a blog or resource (article, book, etc) that shows how this is done? Anyone has done this and would like to share how?
Thank you.

This is in fact possible. I'm not sure about the "best practice" around doing this but there is a couple of ways to do this.
You can either create a managed bean then right click on it and use the wizard to create a data control or you can do it as per below
The a table will convert an array into a collection.
Once you have created an array and generated the accessors in a bean you can then reference the mutli-dimensional array from a table as per below.
<af:table value="#{pageFlowScope.PageBean.sessionArr}" var="row" rowBandingInterval="0" id="t1" varStatus="status">
<af:column sortable="false" headerText="col1" id="c1">
<af:outputText value="#{pageFlowScope.PageBean.sessionArr[status.index][0]}" id="ot1"/>
</af:column>
</af:table>
String [][] sessionArr = new String[5][2];
public void setSessionArr(String[][] sessionArr) {
this.sessionArr = sessionArr;
public String[][] getSessionArr() {
sessionArr[0][0]="rice";
sessionArr[1][0]="water";
return sessionArr;
EDIT: For either of the above methods the managed bean must have a scope of pageFlow or longer.
Cheers,
Aaron
Edited by: Aaron Rapp on Oct 6, 2011 3:28 PM

Best practice in JSTL with multi-dimensional arrays

Hi,
I'm working in a project and I'm trying to convert some code into JSTL way, I have a first.jsp that calls addField(String, String) from fieldControl.jsp:
(first.jsp)
<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@ include file="fieldControl.jsp" %>
<html>
<head><title>JSP Page</title></head>
<body>
<%! String[][] list1;
%>
<%
list1 = new String[2][2];
list1[0][0]="first_1";
list1[0][1]="first_2";
list1[1][0]="second_1";
list1[1][1]="second_2";
for (int i=0;i<list1.length;i++){
String html;
html = addField (list1[0], list1[i][1]);
out.println(html);
%>
</body>
</html>
(fieldControl.jsp)
<%@page contentType="text/html"%>
<%@page pageEncoding="UTF-8"%>
<%@ page language="java" %>
<%! public void addField(String name,String label)
return ...
Now for JSTL I've this example from "JSTL pratical guide for JSP programmers" Sue Spielman:
<%@ taglib uri="http://java.sun.com/jstl/core" prefix="c" %>
<html>
<head>
<title>
Display Results
</title>
</head>
<body>
<%-- Create a HashMap so we can add some values to it --%>
<jsp:useBean id="hash" class="java.util.HashMap" />
<%-- Add some values, so that we can loop over them --%>
<%
     hash.put("apples","pie");
     hash.put("oranges","juice");
     hash.put("plums","pudding");
     hash.put("peaches","jam");
%>
<br>
<c:forEach var="item" items="${hash}">
I like to use <c:out value="${item.key}" /> to make <c:out value="${hash[item.key]}" />
<br>
<br>
</c:forEach>
</body>
</html>
and my problem is :
1st - how to use the multi-dimensional array in this way (<jsp:useBean id="hash" class="java.util.HashMap" />) ? because if I use it like this
<% String[][] list1;
list1 = new String[2][2];
list1[0][0]="first_1";
list1[0][1]="first_1";
list1[1][0]="second_1";
list1[1][1]="second_2";%>
<c:out value="${list1}" />
<c:out value="${list1.lenght}" />
I get nothing,
also tryed <c:set var="test" value="<%=list1.length%>" /> and got "According to TLD or attribute directive in tag file, attribute value does not accept any expressions"
2nd hot to make the call to the method addField?
Thanks for any help, I really want to make this project using JSTL, PV

When you are using JSTL, it is best to not put data inside the JSP. Put it inside JavaBeans. Then make calles to the methods in those JavaBeans.
So you should get used to JavaBeans and their requirenments.
Access JavaBeans only through 2 types of methods: getters and setters.
Getters are used to "get" values (properties) from the bean, and always have the form
public Type getPropertyName(void)
That is, they are public, return some value, start with the exact string "get" end with the name of the property (first letter of the property name capitalized) and have a void (empty) argument list.
For example, this is a good signature to get HTML from a bean:
public String getHtml()
Setters are used to assign values to a bean. They always have the form
public void setPropertyName(Type value)
That is, they are public, do not return anything, start with the string "set", end with the name of the property (first letter capitalized), and take a SINGLE parameter.
public void setHtml(String value)
Also, JavaBeans must have a no argument constructor and need to be Serializable.
The way I would approach this would be to create a JavaBean that holds the two dim array for you, and has a getter that returns a list of all the formatted html.
package mypack;
import java.util.List;
import java.util.ArrayList;
public class DataFormatterBean implement java.io.Serializable {
private String[][] list;
public DataFormatterBean() {
    list = new String[2][2];
    list[0][0]="first_1";
    list[0][1]="first_2";
    list[1][0]="second_1";
    list[1][1]="second_2";
public List getHtml() {
    List outputHtml = new ArrayList(list.length);
    for (int i = 0; i < list.length; i++) {
      String html = addField(list[0], list[i][1]);
outputHtml.add(html);
return outputHtml;
private addField(String a, String b) { .. do work .. }
Then, the JSP would look like this:
<jsp:useBean id="dataFormatter" class="mypack.DataFormatterBean"/>
<c:forEach var="htmlString" items="${dataFormatter.html}">
<c:out value="${htmlString}"/>
</c:forEach>Once you start thinking in terms of having JavaBeans do your work for you JSTL is so much easier... and it gets even easier when you start to delve into custom tags.

How to copy data in text file into two-dimensional arrays?

Greeting. Can somebody teach me how to copy the input file into two-dimensional arrays? I'm stuck in making a matrix with number ROWS and COLUMNS according to the data in "input.txt"
import java.io.*;
import java.util.*;
public class array
    public static void main (String[] args) throws FileNotFoundException
    { Scanner sc = new Scanner (new FileReader("input.txt"));
        PrintWriter outfile = new PrintWriter("output.txt");
    int[][]matrix = new int[ROWS][COLUMNS];
}my input.txt :
a,b,c
2,2,1
1,1,1
2,2,1
3,3,1
4,4,1
5,5,1
1,6,2
2,7,2
3,8,2
4,9,2
5,10,2

import java.io.*;
import java.util.*;
public class array {
    public static void main(String[] args) throws IOException {
        FileInputStream in = null;
        FileOutputStream out = null;
try {
    in = new FileInputStream("input.txt");
    BufferedReader reader = new BufferedReader(new InputStreamReader(in));
    String line = null;
    while ((line = reader.readLine()) != null) {
        String split[]=line.split(",");
catch (IOException x) {
    System.err.println(x);
} finally {
    if (in != null) in.close();
}}}What after this?

How to use two dimensional array in custom.pll

HI
How to use two dimensional arrays in custom.pll
I tried by the following way .
type ship_array is table of number index by binary_integer;
type vc_array is table of ship_array index by binary_integer;
But I am getting the error as that
A plsql table may not contain a table or a record with composite fields.
Please tell me the way how to use them

which forms version are you using? two dimensional arrays are available in >= 9i if memory serves.
regards

Variable number of two dimensional arrays into one big array

I have a variable number of two dimensional arrays.
The first dimension is variable, the second dimension is always 7.
i.e.:
Object[][] array0 = {
{"tim", "sanchez", 34, 175.5, "bla", "blub", "[email protected]"},
{"alice", "smith", 42, 160.0, "la", "bub", "[email protected]"},
Object[][] array1 = {
{"john", "sdfs", 34, 15.5, "a", "bl", "[email protected]"},
{"joe", "smith", 42, 16.0, "a", "bub", "[email protected]"},
Object[][] arrayi = ...I'm generating these arrays with a for-loop:
     for (int i = 0; i < filter.length; i++) {
          MyClass c = new MyClass(filter);
          //data = c.getData();
Where "filter" is another array which is filled with information that tells "MyClass" how to fill the arrays.
"getData()" gives back one of the i number of arrays.
Now I just need to have everything in one big two dimensional array.
i.e.:Object[][] arrayComplete = {
{"tim", "sanchez", 34, 175.5, "bla", "blub", "[email protected]"},
{"alice", "smith", 42, 160.0, "la", "bub", "[email protected]"},
{"john", "sdfs", 34, 15.5, "a", "bl", "[email protected]"},
{"joe", "smith", 42, 16.0, "a", "bub", "[email protected]"},
Any idea on how to accomplish this? It's blowing my mind right now.

Just brainstorming here:
Why not put your actual data in a class and store that in a LinkedList (so you know the total number of elements for your multi-dimensional array). Then initalize your multi-dimensional array and populate it? Haven't tested the following, but thinking something along the lines of
public class MyData {
     //data here
     public Object[] toArray() {
          //something similar to this
          return new Object[] = {"tim", "sanchez", 34, 175.5, "bla", "blub", "[email protected]"};
LinkedList<MyData> data = new LinkedList<MyData>();
data.add(mydata1);
//however many times you need
Object[][] arrayComplete = new Object[data.size()][7];
for(int i = 0; i < data.size(); i++) {
     arrayComplete[i] = data.removeFirst().toArray();
}Another option for knowing how many rows you would need might be using something like:
int rows = 0;
rows += array1.length;
rows += array2.length;
//etc...But is not entirely useful if you don't know how many variable arrays you have (although reflections might help if the name of the array variable is incremented systematically, someone told me earlier to avoid reflections since it could make debugging a LOT more difficult).
Edited by: bogdana on Apr 1, 2010 10:38 AM

Problem returning a two-dimensional array in web service

Hello. I'm having problems returning a two dimensional array in my web service. The service returns a MyClass[][] correctly, but the client receives a different one.
I've done a test that returns a MyClass[1][1] an the client shows a MyClass[1][20]. All the MyClass objects returned in the array are the same and all it's fields are null. There's even an element of the array containing null instead of the object. As I say, the service creates the array ok, but the client gets other thing.
I have other methods returning one-dimensional arrays MyClass[] and I have no problem.
My system:
WindowsXP
Tomcat 5.5 (Axis 1.3?)
JDK 1.5
Eclipse 3.3
My wsdl is generated with eclipse, although I've had to update my wsdd manually.
Any Ideas?
Thanks.

Does it have to be stored in an array?
Because you could use the java.awt.Point class, and a
java.util.Set to create random points until you have
the correct number of unique points.Of course it is no must to store it in an array. it was just my first thought of approaching the problem. I will try the Point.class. Thanks for that hint.

Creating one and two Dimensional array

Hi guys my problem is as follows
(1)I want to create a two dimensional array of 10 rows and 20 columns
(2)Populate the array with random integers
(3)convert the two dimensinal array into one dimensional array int[]nums
(4)print the content of one and two dimensional arrays to the screen

You don't learn much about coding if you don't write any code. Without seeing the code that was written it's very difficult to assist a person, since your solution may not be anywhere close to their solution. If the poster just wants the code to hand in or use as is then there is no learning happening.
So, step 1 - post your code, step 1a - ask a clear question.
Just my opinions
Lee

Use of multi-dimensional arrays in forms - forms debugger crash

Hello All readers,
have an issue with use of multi-dimensional arrays in forms when debugging and/or calling another form post array-population.
USING VERSIONS: oracle forms 9.0.4, Jinitiator 1.3.1.17, oracle db 10.1
the following code snippet works from a when-button-pressed trigger when called without the debugger. when called with the debugger it crashes when any element of the multi-dimensional associative array is accessed/populated/read. In addition, if i populate the multi-dimensional array then call a form (a msgbox form to display the arrays content as a string) it crashes too.
declare
type datasource_rec is record (field varchar2(32), val varchar2(3999));
type datasource_arr is table of datasource_rec index by binary_integer;
type datasource_arr_arr is table of datasource_arr index by binary_integer;
     l_arr datasource_arr_arr;
     procedure poparr(i_arr out datasource_arr_arr) is
          idx binary_integer := 1;
          iidx binary_integer := 1;
     begin
          while (idx <= 10) loop
               iidx := 1;
               while (iidx <= 10) loop
                    i_arr(idx)(iidx).field := 'field'||to_char(iidx)||':'||to_char(idx); --# debugger crashes here with JVM aborting... message (which crashes forms builder too)
i_arr(idx)(iidx).val := 'test value';
               iidx := iidx+1;
               end loop;
          idx := idx+1;
          end loop;
     end;
     procedure printarr is
          idx binary_integer := l_arr.first;
          iidx binary_integer;
          l_msg varchar2(4000);
          l_response pls_integer;
     begin
          while (idx is NOT null) loop
               iidx := l_arr(idx).first;
               while (iidx is NOT null) loop
                    l_msg := l_msg||chr(10)||l_arr(iidx)(idx).field||' = '||l_arr(iidx)(idx).val;
               iidx := l_arr(idx).next(iidx);
               end loop;
          idx := l_arr.next(idx);
          end loop;
          alerts.info('see console for full printout: '||chr(10)||l_msg);
--l_response := msgbox.show(l_msg); --calls another modal form to display a long message, which crashes the runtime with a java console message*
     r$debug.print(l_msg);
     end;
begin
     poparr(l_arr);
     printarr;
end;
The java console does not print anything useful when both forms builder and the runtime crash/hangs as a result of the debugger being attached (except displaying a "JVM aborting" message) but when the runtime alone crashes as a result of calling another form after popping the MD array it prints:
oracle.forms.net.ConnectionException: Forms session <28> aborted: unable to communicate with runtime process.
     at oracle.forms.net.ConnectionException.createConnectionException(Unknown Source)
     at oracle.forms.net.HTTPNStream.getResponse(Unknown Source)
     at oracle.forms.net.HTTPNStream.doFlush(Unknown Source)
     at oracle.forms.net.HTTPNStream.flush(Unknown Source)
     at java.io.DataOutputStream.flush(Unknown Source)
     at oracle.forms.net.StreamMessageWriter.run(Unknown Source)
has anyone else encountered this problem and found a solution/workaround? is their some sort of memory limitation for forms-side handling of (multi-dimensional) arrays?+
many thanks
ps: i get similar problems when a) populating the array from a server/db-side packaged procedure (crashes with java console message as above even when not debugging) b) using server/db-side packaged types for the array.

Hello All readers,
have an issue with use of multi-dimensional arrays in forms when debugging and/or calling another form post array-population.
USING VERSIONS: oracle forms 9.0.4, Jinitiator 1.3.1.17, oracle db 10.1
the following code snippet works from a when-button-pressed trigger when called without the debugger. when called with the debugger it crashes when any element of the multi-dimensional associative array is accessed/populated/read. In addition, if i populate the multi-dimensional array then call a form (a msgbox form to display the arrays content as a string) it crashes too.
declare
type datasource_rec is record (field varchar2(32), val varchar2(3999));
type datasource_arr is table of datasource_rec index by binary_integer;
type datasource_arr_arr is table of datasource_arr index by binary_integer;
     l_arr datasource_arr_arr;
     procedure poparr(i_arr out datasource_arr_arr) is
          idx binary_integer := 1;
          iidx binary_integer := 1;
     begin
          while (idx <= 10) loop
               iidx := 1;
               while (iidx <= 10) loop
                    i_arr(idx)(iidx).field := 'field'||to_char(iidx)||':'||to_char(idx); --# debugger crashes here with JVM aborting... message (which crashes forms builder too)
i_arr(idx)(iidx).val := 'test value';
               iidx := iidx+1;
               end loop;
          idx := idx+1;
          end loop;
     end;
     procedure printarr is
          idx binary_integer := l_arr.first;
          iidx binary_integer;
          l_msg varchar2(4000);
          l_response pls_integer;
     begin
          while (idx is NOT null) loop
               iidx := l_arr(idx).first;
               while (iidx is NOT null) loop
                    l_msg := l_msg||chr(10)||l_arr(iidx)(idx).field||' = '||l_arr(iidx)(idx).val;
               iidx := l_arr(idx).next(iidx);
               end loop;
          idx := l_arr.next(idx);
          end loop;
          alerts.info('see console for full printout: '||chr(10)||l_msg);
--l_response := msgbox.show(l_msg); --calls another modal form to display a long message, which crashes the runtime with a java console message*
     r$debug.print(l_msg);
     end;
begin
     poparr(l_arr);
     printarr;
end;
The java console does not print anything useful when both forms builder and the runtime crash/hangs as a result of the debugger being attached (except displaying a "JVM aborting" message) but when the runtime alone crashes as a result of calling another form after popping the MD array it prints:
oracle.forms.net.ConnectionException: Forms session <28> aborted: unable to communicate with runtime process.
     at oracle.forms.net.ConnectionException.createConnectionException(Unknown Source)
     at oracle.forms.net.HTTPNStream.getResponse(Unknown Source)
     at oracle.forms.net.HTTPNStream.doFlush(Unknown Source)
     at oracle.forms.net.HTTPNStream.flush(Unknown Source)
     at java.io.DataOutputStream.flush(Unknown Source)
     at oracle.forms.net.StreamMessageWriter.run(Unknown Source)
has anyone else encountered this problem and found a solution/workaround? is their some sort of memory limitation for forms-side handling of (multi-dimensional) arrays?+
many thanks
ps: i get similar problems when a) populating the array from a server/db-side packaged procedure (crashes with java console message as above even when not debugging) b) using server/db-side packaged types for the array.

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