Weird behaviour on imported java classes - what am i doing wrong?

Hello.
I am working on a java application in Jdeveloper 11g. I thought i'd re-use a few java classes that i had from an earlier project. I went File->import->Java source and pointed out the .java files. They popped into my Jdeveloper project perfectly like i expected. I opened up one of them and spent some time making changes to it. I then opened a second one and changed it too. Upon returning to the first one, i noticed that all my changes were gone and the original version was back. I also notied that by clicking on the history tab, i could see a list of revisions - i guess one for every time i saved the file. What i fail to understand is why the latest revision says "Load External State" and is back to square one.
Am i using this in the wrong way?
M@s

Hi,
I tried the same but this doesn't happen to me. Which version of JDeveloper do you use ?
Frank

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JAVA Help, what am I doing wrong?

HI, I have this class and method
It runs properly when called upon, but there is an error at the end and the program ceases - not running running back to my program menu,
anything you can see I'm doing wrong?
Or is there a better/easier way to do this?
import java.io.File;
import java.util.Scanner;
public class Program{
     public Program(){
          super();
     public void printProgramList() throws Exception{
          PL1[] allstudentObjArray = new PL1[9];
               Scanner pl2 = new Scanner(new File("test.txt"));
               int i=0;
          //     boolean found = false;
               while(pl2.hasNextLine())
               //Delimit this line with scanner
               Scanner sa1 = new Scanner(pl2.nextLine());
               sa1.useDelimiter(":");
               allstudentObjArray[i] = new PL1(sa1.next(),sa1.next(),sa1.next(),sa1.next(),sa1.next(),sa1.next(),sa1.next(),sa1.next(),sa1.next());
               i++;
               }//while
               for(int i1 = 0;i1 < allstudentObjArray.length;i1++)
               System.out.println(allstudentObjArray[i1].CourseCode);
               System.out.println(allstudentObjArray[i1].CrsSub1);
               System.out.println(allstudentObjArray[i1].CrsSub2);
               System.out.println(allstudentObjArray[i1].CrsSub3);
               System.out.println(allstudentObjArray[i1].CrsSub4);
               System.out.println(allstudentObjArray[i1].CrsSub5);
               System.out.println(allstudentObjArray[i1].CrsSub6);
               System.out.println(allstudentObjArray[i1].CrsSub7);
               System.out.println(allstudentObjArray[i1].CrsSub8);
               System.out.println("-----------------");
     }//NEED FOR CLASS
class PL1
String CourseCode = null;
String CrsSub1 = null;
String CrsSub2 = null;
String CrsSub3 = null;
String CrsSub4 = null;
String CrsSub5 = null;
String CrsSub6 = null;
String CrsSub7 = null;
String CrsSub8 = null;
PL1()
PL1(String CourseCode,String CrsSub1, String CrsSub2, String CrsSub3, String CrsSub4, String CrsSub5, String CrsSub6, String CrsSub7, String CrsSub8)
this.CourseCode = CourseCode;
this.CrsSub1 = CrsSub1;
this.CrsSub2 = CrsSub2;
this.CrsSub3 = CrsSub3;
this.CrsSub4 = CrsSub4;
this.CrsSub5 = CrsSub5;
this.CrsSub6 = CrsSub6;
this.CrsSub7 = CrsSub7;
this.CrsSub8 = CrsSub8;
     The text file has data like this
Test123:ABCD1213:ABCD1896:ABCD1890:ABCD1913:ABCD5513:ABCD1673:ABCD8913:ABCD1278

My 2c.
1. Use a list (or other dynamin datastructure) when you do don't know before-hand how-big the list-of-stuff is going to be.
2. "subjects" is obviously a list-of-stuff... so use some sort of "collection" datastructure to represent it, NOT nine distinct variables (puke!)... in this case we do know how big the list-of-stuff is, because we've just read it from file... so an array will do nicely.
3. Oh FFS, use meaningful variable and especially class names! Putz!
package forums;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.Scanner;
import java.util.Arrays;
import java.util.List;
import java.util.ArrayList;
class Course
private final String id;
private final String[] subjects;
public Course(String courseCode, String[] subjects) {
    this.id = courseCode;
    this.subjects = subjects;
@Override
public String toString() {
    return id+": "+Arrays.toString(subjects);
public class CourseManager
private List<Course> courses = null;
public static void main(String[] args) {
    try {
      new CourseManager("CourseManager.txt").print();
    } catch (Exception e) {
      e.printStackTrace();
public CourseManager(){
public CourseManager(String filename) throws FileNotFoundException, IOException {
    read(filename);
public void read(String filename) throws FileNotFoundException, IOException {
    this.courses = new ArrayList<Course>();
    Scanner scanner = null;
    try {
      scanner = new Scanner(new File(filename));
      while( scanner.hasNextLine() ) {
        String[] fields = scanner.nextLine().split(":");
        courses.add(new Course(fields[0], Arrays.copyOfRange(fields, 1, fields.length)));
    } finally {
      if(scanner!=null)scanner.close();
public void print() {
    for ( Course course : courses ) {
      System.out.println(course);
      System.out.println("-----------------");
}Cheers. Keith.
Edited by: corlettk on 9/05/2009 14:40 ~~ More succinct.

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null

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Is anybody knows where i can find documentation about the Import Java Classes functions in Forms9i.
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Hi,
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http://otn.oracle.com/products/forms/pdf/forms_in_java_world.pdf
http://otn.oracle.com/products/forms/pdf/javaimporter.pdf
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Hi all
I made a java class that has methods to return Screen width and Height .
package tarek;
import java.awt.Dimension;
import java.awt.Toolkit;
public class Screen
Dimension dim ;
public Screen()
dim = Toolkit.getDefaultToolkit().getScreenSize();
public double getWidth()
double w = dim.getWidth();
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public double getHeight()
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-- Constructor for signature ()V
FUNCTION new RETURN ORA_JAVA.JOBJECT;
-- Method: getHeight ()D
FUNCTION getHeight(
obj ORA_JAVA.JOBJECT) RETURN NUMBER;
-- Method: getWidth ()D
FUNCTION getWidth(
obj ORA_JAVA.JOBJECT) RETURN NUMBER;
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vScreen_Class ORA_JAVA.JOBJECT;
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error 306 AT LINE 5 , COLUMN 25
wrong number or types of argument in call to "NEW"
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Is it because the method in java return "double datatype" while in oracle return "number datatype"
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Edited by: [email protected] on Dec 28, 2009 10:24 AM

Sarah, I ca not move my thread to JDeveloper because it is not java issue. The problem is with my PL/SQL code and the way I make Import Java class to forms Builder. The Java code is OK.
Andreas Thank you so much for replying. In fact I made a full compile "Ctrl+Alt+K". but still error
The following is the package Body
PACKAGE BODY Screen IS
-- DO NOT EDIT THIS FILE - it is machine generated!
args JNI.ARGLIST;
-- Constructor for signature ()V
FUNCTION new RETURN ORA_JAVA.JOBJECT IS
BEGIN
args := NULL;
RETURN (JNI.NEW_OBJECT('tarek/Screen', '()V', args));
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FUNCTION getHeight(
obj ORA_JAVA.JOBJECT) RETURN NUMBER IS
BEGIN
args := NULL;
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END;
-- Method: getWidth ()D
FUNCTION getWidth(
obj ORA_JAVA.JOBJECT) RETURN NUMBER IS
BEGIN
args := NULL;
RETURN JNI.CALL_DOUBLE_METHOD(FALSE, obj, 'tarek/Screen', 'getWidth', '()D', args);
END;
BEGIN
NULL;
END;
---------------------------------------------------------------------------------

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Hi,
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I follow the instruction and follow the sample form from OTN.
Ok, this is what I did and tell me what I did wrong.
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Weird behaviour on imported java classes - what am i doing wrong?

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