Palm OS: Invalid constant pool entry - What's that?

Hello,
I'm a newbie in developing application 4 my palm. (midp4palm 1.0 installed)
I started with a "hello world"... everything went fine on my tungsten t3 emulator. Label + TextField.
Then I wrote a little calculator... and now I get the following message: "Invalid constant pool entry".
I used switch(), some static final doubles and that's it.
Do you know what the problem could be... I didn't find a solution.
Thank you
mastix mc

A quick google search yielded this - hope it helps.
http://archives.java.sun.com/cgi-bin/wa?A2=ind9911&L=kvm-interest&F=&S=&P=8868
Summary:
* "This is usually caused by a null reference not caught by the KVM, or sometimes an instanceof sometime before."
* "I was having exactly this problem on a Palm V.
I re-downloaded the KVM from Sun's site. I am using a Mac, and I noticed
this time, after running ZipIt to unzip the files, that the types of the
files have now been correctly set. I re-installed the files, and now
everything is working fine.
My guess is that something is corrupted in your KVMClassDB.pdb file. I've
done a couple of upgrades to my Mac software and the OS upgrade, so I'd
recommend doing every possible software upgrade, then download the KVM again
and re-install it."

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Alert: Invalid constant pool entry

Hi, When I install midlet application in mobile phone I got this error "Alert: Invalid constant pool entry" and says "Application Error". When I create a object of a class at that time this error occurred. In that class I have used a constant which value is 1.5. After googling so many people are saying this because of floating point value. That May be the problem. Because when I change that 1.5 value to 1 then application get installed and run. But earlier also I used to create the object of that class. At that time mobile phone did not throw any error. But why this time throw error. I did not understand what could be the problem. Please any one help me.

gnat wrote:
hmm let's see if I understand you correctly.
Before, you were using jar "as-is", ie without compiling it, right? - so you basically don't know if the class in it was using floating point or not?
Now, you compile a piece of code that was supposedly used in that jar (but you don't know for sure if it was because you didn't build that jar) and you obtain the problem - correct?hmm let's see if I understand you correctly.
Before, you were using jar "as-is", ie without compiling it, right? - so you basically don't know if the class in it was using floating point or not?
Now, you compile a piece of code that was supposedly used in that jar (but you don't know for sure if it was because you didn't build that jar) and you obtain the problem - correct?
No. No. Both Jars are compiled and built by myself. I find out the problem. problem is costructing the object of that class (which have float value) from startApp(). I got my old Jar which was working earlier. There I costruct the object of that class. So now old jar also giving the "Invalid constant Pool entry" Error. Any that float value I am going to change. Still unclear is What the difference construct object inside startApp() block and ouside startApp() block. Anyway Thank you Guys.

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Hi ,
I found with this simple class , the class file has incorrect constant pool count,
public class Smpl
public final long j = 0;
class file dumped is :
0xCA 0xFE 0xBA 0xBE
0x00 0x00 0x00 0x32
0x00 {color:#ff0000}0x14 <- pool count is 0x14 -1 = 0x13 , but I can just read 0x12 !{color}
0x0A 0x00 0x04 0x00 0x10
0x09 0x00 0x03 0x00 0x11
0x07 0x00 0x12
0x07 0x00 0x13
0x01 0x00 0x01 0x6A
0x01 0x00 0x01 0x4A
0x01 0x00 0x0D 0x43 0x6F 0x6E 0x73 0x74 0x61 0x6E 0x74 0x56 0x61 0x6C 0x75 0x65
0x05 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
0x01 0x00 0x06 0x3C 0x69 0x6E 0x69 0x74 0x3E
0x01 0x00 0x03 0x28 0x29 0x56
0x01 0x00 0x04 0x43 0x6F 0x64 0x65
0x01 0x00 0x0F 0x4C 0x69 0x6E 0x65 0x4E 0x75 0x6D 0x62 0x65 0x72 0x54 0x61 0x62 0x6C 0x65
0x01 0x00 0x0A 0x53 0x6F 0x75 0x72 0x63 0x65 0x46 0x69 0x6C 0x65
0x01 0x00 0x09 0x73 0x6D 0x70 0x6C 0x2E 0x6A 0x61 0x76 0x61
0x0C 0x00 0x0A 0x00 0x0B
0x0C 0x00 0x05 0x00 0x06
0x01 0x00 0x04 0x53 0x6D 0x70 0x6C
0x01 0x00 0x10 0x6A 0x61 0x76 0x61 0x2F 0x6C 0x61 0x6E 0x67 0x2F 0x4F 0x62 0x6A 0x65 0x63 0x74
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0x00 0x03 this class
0x00 0x04 super class
0x00 0x00 interfaces count
0x00 0x01 fields count
0x00 0x11 acc flag
0x00 0x05 name idx
0x00 0x06 desc idx
0x00 0x01 attrs count
0x00 0x07 name idx
0x00 0x00 0x00 0x02 attr len
0x00 0x08 info
0x00 0x01 methods count
0x00 0x01 acc flag
0x00 0x0A name idx
0x00 0x0B desc idx
0x00 0x01 attrs count
0x00 0x0C name idx
0x00 0x00 0x00 0x26 attr len
0x00 0x03 max stack
0x00 0x01 max loacls
0x00 0x00 0x00 0x0A code len
0x2A 0xB7 0x00 0x01 0x2A 0x09 0xB5 0x00 0x02 0xB1 code
0x00 0x00 exception table len
0x00 0x01 attr count
0x00 0x0D name idx
0x00 0x00 0x00 0x0A attr len
0x00 0x02 0x00 0x00 0x00 0x01 0x00 0x04 0x00 0x03 info
0x00 0x01 attrs count
0x00 0x0E name idx
0x00 0x00 0x00 0x02 attr len
0x00 0x0F
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sunnyyu wrote:
Hi ,
I found with this simple class , the class file has incorrect constant pool count,
public class Smpl
public final long j = 0;
0x0A 0x00 0x04 0x00 0x10
0x09 0x00 0x03 0x00 0x11
0x07 0x00 0x12
0x07 0x00 0x13
0x01 0x00 0x01 0x6A
0x01 0x00 0x01 0x4A
0x01 0x00 0x0D 0x43 0x6F 0x6E 0x73 0x74 0x61 0x6E 0x74 0x56 0x61 0x6C 0x75 0x65
0x05 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
0x01 0x00 0x06 0x3C 0x69 0x6E 0x69 0x74 0x3E
0x01 0x00 0x03 0x28 0x29 0x56
0x01 0x00 0x04 0x43 0x6F 0x64 0x65
0x01 0x00 0x0F 0x4C 0x69 0x6E 0x65 0x4E 0x75 0x6D 0x62 0x65 0x72 0x54 0x61 0x62 0x6C 0x65
0x01 0x00 0x0A 0x53 0x6F 0x75 0x72 0x63 0x65 0x46 0x69 0x6C 0x65
0x01 0x00 0x09 0x73 0x6D 0x70 0x6C 0x2E 0x6A 0x61 0x76 0x61
0x0C 0x00 0x0A 0x00 0x0B
0x0C 0x00 0x05 0x00 0x06
0x01 0x00 0x04 0x53 0x6D 0x70 0x6C
0x01 0x00 0x10 0x6A 0x61 0x76 0x61 0x2F 0x6C 0x61 0x6E 0x67 0x2F 0x4F 0x62 0x6A 0x65 0x63 0x74 I make that 0x13 entries (minus the unusable entry at 0x9)
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0x0010 0x02: 0x9 0x3,0x11
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0x0018 0x04: 0x7 0x13
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0x001f 0x06: 0x1 "J"
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0x003c 0x0a: 0x1 "<init>"
0x0045 0x0b: 0x1 "()V"
0x004b 0x0c: 0x1 "Code"
0x0052 0x0d: 0x1 "LineNumberTable"
0x0064 0x0e: 0x1 "SourceFile"
0x0071 0x0f: 0x1 "Smpl.java"
0x007d 0x10: 0xc 0xa,0xb
0x0082 0x11: 0xc 0x5,0x6
0x0087 0x12: 0x1 "Smpl"
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Hi applediva,
Maybe the diva part explains the shouting (using Capital letters).
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See this Response http://discussions.apple.com/messageview.jspa?messageID=9864961
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Is there any change in the constant pool entires with JDK1.4?

Hi,
Here is my simple java class,
class Base
String manuf = "MRF";
class Derived extends Base
Derived() {
manuf = "ABC";
After compiling this class with JDK 1.3 and JDK1.4, i could see the difference in constant pool entries
so please let me know more about these cahnges.
P.S. : written a java program TClass.java to browse the constant pool entries.
i.e if compiled with JDK1.3 , constant pool entries looks as follows,
E:\bugs\jdk1.4\pramila>java TClass E:\bugs\jdk1.4\pramila\Derived.class
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Index Tag Reference(s)/Value(s)
1 10 5 15
2 8 16
3 9 5 17
4 7 18
5 7 19
6 1 <init>
7 1 ()V
8 1 Code
9 1 LineNumberTable
10 1 LocalVariableTable
11 1 this
12 1 LDerived;
13 1 SourceFile
14 1 Test.java
15 12 6 7
16 1 ABC
17 12 20 21
18 1 Derived
19 1 Base
20 1 manuf
21 1 Ljava/lang/String;
There are 1 methods:
Code array in method <init> of length 11 starting at byte 231.
If compiled with JDK1.4 constant pool entries looks as follows,
E:\bugs\jdk1.4\pramila>java TClass E:\bugs\jdk1.4\pramila\Derived.class
There are 21 + 1 entries in the Constant Pool:
Index Tag Reference(s)/Value(s)
1 10 5 15
2 8 16
3 9 4 17
4 7 18
5 7 19
6 1 <init>
7 1 ()V
8 1 Code
9 1 LineNumberTable
10 1 LocalVariableTable
11 1 this
12 1 LDerived;
13 1 SourceFile
14 1 Test.java
15 12 6 7
16 1 ABC
17 12 20 21
18 1 Derived
19 1 Base
20 1 manuf
21 1 Ljava/lang/String;
There are 1 methods:
Code array in method <init> of length 11 starting at byte 231.
There is a change in the index 3 can be noticed.
i.e
with JDK1.3 it is "3 9 5 17"
with JDK1.4 it is "3 9 4 17"
Thanks in advance.
Pramila

javac v1.4 emits by default Java 1.2 compatible .class files while all javac implementations since between 1.1.0 and 1.3.1 emit byte default Java 1.1 .class files.
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Chuck

Lifetime and behavior of the String Constant Pool

If you 'inline' a String constant in Java, I'm aware in the VM spec that it says this String is put in the constant pool.
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Thanks, Kevin

Is the constant pool created at compile time and written into the Class file?Yes.
Each class has it's own constant pool which contains constant values and references to other classes and fields.
It is created a compile time.
A class (definition) is loaded by a classloader at runtime.
In theory you could have the same class loaded twice by different classloaders and each would have a copy of the class definition.
As far as I know, a class definition can only be removed from memory by nulling/garbage collecting the classloader that loaded it.
regards,
Owen

Why constant pool with 0 entries?

I'm writing a tool that parses SWF files. Recently I see some
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using swfdump there is something like:
[00c] 141 DOACTION
( 0 bytes) action: Not
( 2 bytes) action: If 5
( 131 bytes) action: Constantpool(0 entries)
String:"ˆB" (remainder of 126
bytes:"\5\0wf_toolbar.swf\0toolbar_mc\0loadMovie\0toobar\0createEmptyMovieClip\0›\16\0Loa dToolbar\0\0\0\20\0–\9\0\8\0\7\1\0\0\0\8\1\28–\2\0\8\2R\23–\16\0\8\1\7\2\0\0\0\8\3\7\2\0\0 \0\8\4=<")
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spec how to parse these bytes.
Anyone can help? Thanks.

I'm writing a tool that parses SWF files. Recently I see some
SWF file that has constant pool of 0 entries, yet a lot of bytes
followed. The spec does not describe what this means. For example,
using swfdump there is something like:
[00c] 141 DOACTION
( 0 bytes) action: Not
( 2 bytes) action: If 5
( 131 bytes) action: Constantpool(0 entries)
String:"ˆB" (remainder of 126
bytes:"\5\0wf_toolbar.swf\0toolbar_mc\0loadMovie\0toobar\0createEmptyMovieClip\0›\16\0Loa dToolbar\0\0\0\20\0–\9\0\8\0\7\1\0\0\0\8\1\28–\2\0\8\2R\23–\16\0\8\1\7\2\0\0\0\8\3\7\2\0\0 \0\8\4=<")
( 0 bytes) action: End
The constant pool contains 0 entries. Yet the total byte size
of this action is 131 bytes. Clearly there is meaningful
information contained in these bytes. But I just cannot find in the
spec how to parse these bytes.
Anyone can help? Thanks.

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I was reading an article about weak references and came across a peice of code
Map<String,String> map = new WeakHashMap<String, String>();
map.put(new String("Scott"), "McNealey");They also said
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No it won't: it will only be removed when the garbage collector rears
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has been inserted because the key object is only referenced from the
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reference to it will not be removed from that map. I use such weak maps
for localization reasons a lot. When a localization changes (while the
application is running), a whole lot of visual components must have
their text part changed. They are all stored in such a weak reference map.
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at some time (think of labels etc. in JDialogs after the dialog has been
disposed).
These maps are ideal for those purposes.
kind regards,
Jos

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Hello,
I have developed an application on a windows system that connects to a database, places values onto an object, and displays on a screen. When I run on a windows environment everything works fine. When I export to my external server, which is linux system, I get an "Illegal Constant Pool Type" error.
What does this mean and how can I rectify?
The error message can be found at:
http://www.blazingvibes.com/blazinvibes/indexhome.jsp
Thank you all for your help.

No idea since I can't see the error or code.
And I don't know about anyone else but I don't click on links unless I know the source, so its current location isn't going to help in that matter.
Presumably you are doing printStackTrace() so the location of the error is obvious.

How to construct the constant pool?

Greetings,
I seems to have a little bit of a problem.
I have a text file, generated by the javap -c <class_name> command,
i.e.:
javap -c myClass > myClass.txt
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public class Hello extends java.lang.Object {
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   1 invokespecial #6 <Method java.lang.Object()>
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Method void main(java.lang.String[])
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10 dup
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14 lconst_0
15 lconst_1
16 invokevirtual #8 <Method void schedule(java.util.TimerTask, long, long)>
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Hi,
I got the following exception :
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at java.util.concurrent.Executors.newFixedThreadPool(Unknown Source)
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'Thrown when the Java Virtual Machine attempts to read a class file and determines that the file is malformed or otherwise cannot be interpreted as a class file.'
Reinstall.

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at java.lang.ClassLoader.defineClass0(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:509)
at java.lang.ClassLoader.defineClass(ClassLoader.java:438)
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at allaire.jrun.servlet.JRunServletLoader.loadServletInstance(JRunServletLoader.java:190)
at allaire.jrun.servlet.JRunServletLoader.loadServlet(JRunServletLoader.java:177)
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Question about String constant pool

Is there is any function available to find how many Sring literal in String Constant pool

Well, there's stuff like BCEL.
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Why do you want to find out what's in the constant pool?

Illegal constant pool index ????

Hi
I wrote a hello world program using J2ME with a view to writing a game for a mobile phone. I'm a C++ programmer and have never looked a java befor so I have no idea what is going on under the sheets.
The hello world program is called Welcome (straight out of Sun's J2ME book). It seemed to compile ok and left me with a file called Welcome.class
Following the instructions in the book and working from the Command Line on WindowsXP I typed
d:\preverify ....etc
I got the following
Error preverifying class Welcome
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Cheers
Steve

Stupid - hadn't downloaded the runtime

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