java.lang.NullPointerException (Urgent)

[nitinverma274]

I created a application in which i am using a text file for store data.
It is running in the Net Beans Emulator sucessfully.
But when I install the Application in the Nokia Phone.
Then Application install Successfully But On the start time it gives the error Like this.

"Null Pointer
java.lang.NullPointerException".

What Should i do.

[kumarv75]

I created a application in which i am using a text file for store data.
It is running in the Net Beans Emulator sucessfully.
But when I install the Application in the Nokia Phone.
Then Application install Successfully But On the start time it gives the error Like this.

"Null Pointer
java.lang.NullPointerException".

What Should i do.

Look for cldc version and midp versions and look whether the phone supports the version for which u have programmed .........................................................

[nitinverma274]

If i am not using the text file.then the application runs on the Mobile.
But with the text file this gives the error on run time.
But successfully run on the Netbeans Emulator.

[Tiger79]

on which device are u testing this ?
Can u get hold of a S60 device and see if you get the same error ?
If so you might want to do some on-device debugging and see where you have a null-value variable which is getting adressed, cause thats your error...

[nitinverma274]

I am using Nokia Xpress Music. for this.
I have no s60 device.

[ektasrv]

I created a application in which i am using a text file for store data.
It is running in the Net Beans Emulator sucessfully.
But when I install the Application in the Nokia Phone.
Then Application install Successfully But On the start time it gives the error Like this.

"Null Pointer
java.lang.NullPointerException".

What Should i do.

The issue if from the name of the text file - in your resources - in side the JAR that you deploy.
I feel their is CASE MISSMATCH between the actual text file name in the JAR and the name in the code.

[nitinverma274]

The issue if from the name of the text file - in your resources - in side the JAR that you deploy.
I feel their is CASE MISSMATCH between the actual text file name in the JAR and the name in the code.

Ekta, I checked All this, But Still I am facing same Problem.
When I install the application in the Phone then that text file should not be there,
then According to my code, My Code first create that file then write data in the file. then i am not
understanding the Actual Problem.

[Tiger79]

well place the code you think might throw the exception inside a try-catch...
at elast you will be able to identify where it happens...

[ektasrv]

Ekta, I checked All this, But Still I am facing same Problem.
When I install the application in the Phone then that text file should not be there,
then According to my code, My Code first create that file then write data in the file. then i am not
understanding the Actual Problem.

Check Step by Step:
1) Install the app on a new device (w/o the text file), check if the text file is created at the right location where you want to create it in FileSystem?
remember the path for saving a file on filesystem may be different from the path that you all allowed to save on emulator, Try to RUN PDAPDemo example app from SUN WTK on your real target device see which paths are avaiable to j2me to read/write from.
2) If writing of the file is done, and its visible in the filesystem, check the path that you use for reading it back - it should also work.