Reading from Byte Array

[Josweth Reddy]

Hi All,

As per my requirement, I'm retrieving the data from database and storing it into Input stream. Then reading the data length from byte array. I need to remove the junk data from byte array before storing it.

But if you look into the below mentioned code, it is throwing an ArrayIndex out of bound exception. The output file contains the junk data.

Hope you will help me out regarding the same.

// Read Char from Byte Array

byte[] newbuf = new byte[4 * 8192];
String str = new String(new char[]{(char)0x4EC1,(char)0x4E01});
byte buff[] = str.getBytes("UTF8");

// retrieving the data from database result set
// Storing the retrieved data in InputStream format

InputStream in=rs.getBinaryStream(1);
OutputStream out;

int newread = in.read(newbuf);
System.out.println("\n newread length >> "+newread);
try{
for(int i =0; i<newread; i++) {
System.out.print(newread+"\n newread >> ");
System.out.print(buff[i]+" ");

//System.out.print("\n newread >> "+newread);
out.write(newbuf, 0, newread);

System.out.println(newbuf[i]);
}
}catch (Exception e){
e.printStackTrace();
}




Thaknks in advance,
Josweth Reddy

[Jesper de Jong]

It looks like this question does not have anything to do with the SCJP exam. I am moving it to a more appropriate forum.

In which line does the ArrayIndexOutOfBoundsException happen? Look at that line in your source code. The exception means that you are using a wrong value to index an array.

[Norm Radder]

it is throwing an ArrayIndex out of bound exception.

Please post the full text of any error messages. There is very IMPORTANT
info in the message.

[Rob Spoor]

I'd say this line is causing the problems:
System.out.print(buff[i]+" ");

buff is an array of a very small size, definitely a lot smaller than newbuf. If newread is larger than its size you will get an exception.