ALERT: Bad dynamic heap objects found or ALERT: Invalid heap pointer found

[polys]

I keep getting one of these two alerts whenever I try to run a MIDlet on the emulator and the emulator crashes. This happens only when a specific part of the code is executed. What does it mean and how can i resolve it?

I believe it has something to do with the images that i am using but i am not sure. 90% of the times It crashes from the first attempt to execute the specific code but some other times it executes the code well once or twice in a row and crashes on the next attempt.

I get something like this

Method............: 10230c4c 'com/sun/midp/io/ResourceInputStream.<init> (virtual)' 
Stack Chunk.......: 3e3bfd0
Frame Pointer.....: 3e3c088
Current IP........: 103379cd = 103379a5 + offset 40
Previous Frame....: 3e3c060
Previous IP.......: 10369ef0 (offset 83)
Frame size........: 3 (2 arguments, 1 local variables)
Argument[0].......: 3d39cb4
Argument[1].......: 3d39cd8
Local[2]..........: 3d39ba4
Operand[1]........: 3d39cb4
Operand[2]........: 3d39cb4
Operand[3]........: 3d39b78

Method............: 10253f84 'java/lang/Class.getResourceAsStream (virtual)' 
Stack Chunk.......: 3e3bfd0
Frame Pointer.....: 3e3c060
Current IP........: 10369ef0 = 10369e9d + offset 83
Previous Frame....: 3e3c038
Previous IP.......: 1034ce40 (offset 14)
Frame size........: 4 (2 arguments, 2 local variables)
Argument[0].......: 103decc4
Argument[1].......: 3d39cd8
Local[2]..........: 1034ce36
Local[3]..........: 3e3c04c
Operand[1]........: 3d39cb4

Method............: 102415e8 'javax/microedition/lcdui/ImmutableImage.<init> (virtual)' 
Stack Chunk.......: 3e3bfd0
Frame Pointer.....: 3e3c038
Current IP........: 1034ce40 = 1034ce32 + offset 14
Previous Frame....: 3e3c010
Previous IP.......: 10329b6a (offset 8)
Frame size........: 3 (2 arguments, 1 local variables)
Argument[0].......: 3d39cf0
Argument[1].......: 3ec9c0c
Local[2]..........: 0

Method............: 10226fdc 'javax/microedition/lcdui/Image.createImage (static)' 
Stack Chunk.......: 3e3bfd0
Frame Pointer.....: 3e3c010
Current IP........: 10329b6a = 10329b62 + offset 8
Previous Frame....: 3e3bff0
Previous IP.......: 3ec9843 (offset 7)
Frame size........: 2 (1 arguments, 1 local variables)
Argument[0].......: 3ec9c0c
Local[1]..........: 3d39d08
Operand[1]........: 3d39cf0

and then

VM status:
Instruction pointer.: 103379cd (offset within invoking method: 40)
Next instruction....: 0xce
Frame pointer.......: 3e3c088
Local pointer.......: 3e3c07c
Stack size..........: 256; sp: 3e3c0a8; ranges: 3cd0af8-3cd0cf8;3e3bfd8-3e3c1d8;
Contents of the current stack frame:
    3e3c07c: 3d39cb4 (lp)
    3e3c080: 3d39cd8
    3e3c084: 3d39ba4
    3e3c088: 3e3c060 (fp)
    3e3c08c: 10369ef0
    3e3c090: 3e3c078
    3e3c094: 10230c4c
    3e3c098: 3e3bfd0
    3e3c09c: 0 (end of frame)
    3e3c0a0: 3d39cb4
    3e3c0a4: 3d39cb4
    3e3c0a8: 3d39b78 (sp)
Execution stack contains 724 items: 
3cd0e30  
0  
0  
0  
0  
0  
0  
ffffffff  
ffffffff  
ffffffff  
ffffffff  
0  
1  
3cd0de0  
0  
0  
0  
1  
3e4ffa4  
10250940  
3cd0af0  
0  
3cd0e30  
1  
1  
3cd0b38  
10367144  
3cd0b4c  
10250960  
3cd0af0  
0  
3cd0e4c  
1  
0  
fffffffb  
3cd0b5c  
103673c9  
3cd0b5c  
103673d2  
3cd0b70  
1023dd24  
3cd0af0  
0  
3cd0e4c  
1  
0  
fffffffb  
3cd0e40  
0  
3cd0de0  
3cd0af0  
3cd0b8c  
10349002  
3cd0ba0  
1021c868  
3cd0af0  
0  
3cd12d0  
1  
fffffffb  
3cd0bc4  
1031baac  
3cd0bd8  
10229974  
3cd0af0  
0  
3ce0a2c  
1  
fffffffb  
3ce2720  
0  
3cd17ec  
3cd0af0  
3cd0be8  
1032e8ac  
3cd0bfc  
102617cc  
3cd0af0  
0  
3ce2720  
fffffffb  
3ce2720  
3cd17e0  
1028ccd0  
3cd0af0  
3cd0c1c  
1037bb92  
3cd0c30  
1029013c  
3cd0af0  
0  
3ce2720  
3cd052c  
3ce2720  
3d39d30  
3cd0c4c  
103c6527  
3cd0c60  
3ecadd0  
3cd0af0  
0  
3ce0ac8  
3ecae58  
3ecae58  
3cd0c74  
3ecaccc  
3cd0c88  
3ecdf28  
3cd0af0  
0  
3ce1f38  
ffffffff  
3cd0cac  
3cd0c98  
3ecd5fc  
3cd0cac  
3ec9aa8  
3cd0af0  
0  
3ce1f38  
40408000  
3eab367a  
40414b57  
13  
3ce25b8  
0  
0  
0  
3ce1f38  
0  
c  
3d39d08  
0  
3cd0c98  
3cd0cbc  
3ec9919  
3cd0cd0  
3ec9ac8  
3e3bfd0  
0  
3ec9c0c  
3d39d08  
3e3bff0  
3ec9843  
3e3c004  
10226fdc  
3e3bfd0  
0  
3d39cf0  
3d39cf0  
3ec9c0c  
0  
3e3c010  
10329b6a  
3e3c028  
102415e8  
3e3bfd0  
0  
103decc4  
3d39cd8  
1034ce36  
3e3c04c  
3e3c038  
1034ce40  
3e3c04c  
10253f84  
3e3bfd0  
0  
3d39cb4  
3d39cb4  
3d39cd8  
3d39ba4  
3e3c060  
10369ef0  
3e3c078  
10230c4c  
3e3bfd0  
0  
3d39cb4  
3d39cb4  
3d39b78  

Execution completed.
143082966 bytecodes executed
3421 thread switches
1691 classes in the system (including system classes)
89053 dynamic objects allocated (5434716 bytes)
27 garbage collections (3489856 bytes collected)
Execution completed.
143082966 bytecodes executed
3421 thread switches
1691 classes in the system (including system classes)
89053 dynamic objects allocated (5434716 bytes)
27 garbage collections (3489856 bytes collected)
ALERT: Bad dynamic heap objects found
ricoh-run:
semc-icon-assembly:
semc-ppro-emulator:
semc-do-run:
semc-run:
savaje-run:
sjmc-run:
nokiaS80-run:
nsicom-run:
bdj-run:
run:

[r2j7]

Hello polys,

I try to run a MIDlet on the emulator and the emulator crashes.

Which emulator this is about?

This happens only when a specific part of the code is executed

Could you please elaborate more on this code? You mentioned on fetching pics (based on the logs this would be the case, however more info is required for analysis.)

Regards,
r2j7

[polys]

Which emulator this is about?

I am using the DefaultColorPhone of WTK 2.5.2 for CDLC

Could you please elaborate more on this code? You mentioned on fetching pics (based on the logs this would be the case, however more info is required for analysis.)
r2j7

gpsCom check in which botanical division of Cypurs the user is located in. I am using a map which is separated into 8 divisions, each with a different color

public void gpsCom(){
        Runtime.getRuntime().freeMemory();
        int division = divisionFinder.getDivision();
        
        if (division == -1) {
            Alert gps = new Alert("GPS Command", "The botanical division you are located in has not yet been identified.", null, AlertType.INFO);
            gps.setTimeout(2000);
            display.setCurrent(gps, mainList);
        }
        else if (division == -2) {
            Alert gps = new Alert("GPS Command", "You are not located in any botanical division of Cyprus.", null, AlertType.INFO);
            gps.setTimeout(2000);
            display.setCurrent(gps, mainList);
        }
        else{            
            divisionSelected = division;
            GPSLocationForm gpsLocationForm = new GPSLocationForm (this, divisionSelected);
            display.setCurrent(gpsLocationForm);
        }
    }

The value of the corresponding pixel of the map is checked to define which division the user is located in.

Inise divisionFinder Class:

public int getDivision () {
        int division = -1;        
        if (latitude_N == 0 && longitude_E == 0)
            return -1;
        if (latitude_N < minLatitude || latitude_N > maxLatitude ||
                longitude_E < minLongitude || longitude_E > maxLongitude){
            return -2;
        }
        else {
            int[] p = readImagePixel();
            if (p[1] > 110 && p[1]<130)
                p[1] = 123;
            if (p[0] == 0 && p[1] == 123 && p[2] == 255)
                division = 1;
            else if (p[0] == 255 && p[1] == 123 && p[2] == 0)
                division =  2;
            else if (p[0] == 0 && p[1] == 123 && p[2] == 0)
                division =  3;
            else if (p[0] == 255 && p[1] == 123 && p[2] == 255)
                division =  4;
            else if (p[0] == 255 && p[1] == 255 && p[2] == 0)
                division =  5;
            else if (p[0] == 255 && p[1] == 0 && p[2] == 0)
                division =  6;
            else if (p[0] == 0 && p[1] == 255 && p[2] == 0)
                division =  7;
            else if (p[0] == 0 && p[1] == 0 && p[2] == 255)
                division =  8;
            else if (p[0] == 255 && p[1] == 255 && p[2] == 255)
                division = -2;
        }
        return division;
    }
    
    public int[] readImagePixel () {                
        Image map = null;
        try {
            map = Image.createImage("/PlantIdentification/map.png");
        } catch (IOException ex) {
            ex.printStackTrace();
        }

        int pixel_x = (int)(((longitude_E - minLongitude) / difLongitude) * (double)map.getWidth());
        int pixel_y = (int)((double)map.getHeight() - ((latitude_N - minLatitude) / difLatitude) * (double)map.getHeight());

        int[] colorTable = new int[1];
        try {
            map.getRGB(colorTable, 0, map.getWidth(), pixel_x, pixel_y, 1, 1);
        } catch (Exception ex) {
            ex.printStackTrace();
        }        
        int[] pixel = new int[3];
        pixel[0] = (int)((colorTable[0]&0x00FF0000)>>>16); //Red
        pixel[1] = (int)((colorTable[0]&0x0000FF00)>>>8); //Green
        pixel[2] = (int)(colorTable[0]&0x000000FF); //Blue
        return pixel;
    }

The problem occurs when i execute this code starting from gpsCom().

[grahamhughes]

This may simply be a bug in the emulator. I suggest you upgrade to Java Platform Micro Edition Software Development Kit 3.0.

Graham.