OutOfMemoryError??

[Andrea Gazzarini]

Hi everyone...this is my problem:
If I start the application with a -db C:\\mydb.db option and mydb.db isn't a valid fly by night services database file (for example an ASCII file), the Data class does:
nFields = db.readInt();
description = new FieldInfo[nfields];
the value of nFields is absolutely wrong, because it contains a large integer value, so when it tries to dim the array description, it throws an OutOfMemoryError!
How I can achieve this behaviour?? I suppose is incorrect to insert in my code a try {} catch (OutOfMemoryError) { }
Thanks...

[Pete Lyons]

Some of us added a rudimentary integrity check to our startup code that would prevent this from happening if you opened up other files by mistake. There's another thread that discusses it, but I couldn't find it. Anyway, the code is like this:

 
 RandomAccessFile formatCheck = new RandomAccessFile(dbFile, "r");
        int headerLen = formatCheck.readInt();
        int nFields = formatCheck.readInt();
        int recordCount = formatCheck.readInt();
        if(headerLen < 0 || nFields != 9 || recordCount < 1) {
            throw new IOException("Database file at path '" +dbFile.getPath() 
                    + "' is not a proper db.db file");
        }
 

[Andrea Gazzarini]

Thanks Pete, but...
you can't write in your code
if(headerLen < 0 || nFields != 9 || recordCount < 1)
because in this way you will able to manage a datasource with only 9 field (future enhancements...). The structure of your database is hard-coded and I think it is not very well...
Thanks anyway...