Vamsi Pavan’s Place

Similar exceptions are :
1. java.io.IOException: Io exception: Unexpected packet
2. java.sql.SQLException: Protocol violation
3. java.sql.SQLException: Io exception: Bad packet type
4. java.sql.SQLException: Bigger type length than Maximum
5. java.sql.SQLException: Io exception: Invalid Packet Lenght
6. java.sql.SQLException: Closed Connection
7. java.sql.SQLException: Closed Statement
8. java.sql.SQLException: Refcursor value is invalid
9. java.sql.SQLException: Io exception: Size Data Unit (SDU) mismatch
10. java.sql.SQLException: Must be logged on to […]

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An interesting exception faced while parsing xml content. Also, on further analysis on this error caused below similar issues started to raise.
Another similar exception is:
java.io.UTFDataFormatException: Invalid byte 1 of 1-byte UTF-8 sequence
Here, I am trying to parse an xml string using byte array from the xml string, and give that array as input to xml […]

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StringBuffer is used to store character strings that will be changed (String objects cannot be changed). It automatically expands as needed. Related classes: String, CharSequence.
StringBuilder was added in Java 5. It is identical in all respects to StringBuffer except that it is not synchronized, which means that if multiple threads are accessing it at […]

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A marker or tagging interface is an interphase with no methods. It can be created by ANYBODY. the purpose of these interfaces is to create a special type of Object, in such a way that you are restricting the classes that can be cast to it without placing ANY restrictions on the exported methods that […]

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import java.io.*;
import javax.xml.parsers.*;
import org.w3c.dom.*;
import org.xml.sax.*;
public class BasicDom {
public static void main(String[] args) {
Document doc = parseXmlFile(”infilename.xml”, false);
}
// Parses an XML file and returns a DOM document.
// If validating is true, the contents is validated against the DTD
// specified in the file.
public static Document parseXmlFile(String filename, boolean validating) {
try {
// Create […]

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1) using new operator:- String st=new String(”abc”);
2) Without using new operator:- String st=”abc”;
Once string object is created with or without new operator contents of string object cannot be modified. But we can modify String reference variable. when you are trying to modify string objects ie.. concatinating,repalcing etc.. a new […]

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In this article we’ll show you how to read and write Excel files and how to read any Microsoft file’s document properties.
Conventions
The POI project is nearing a 2.0 release and is in a stage of rapid development, with new features and changes integrating nightly. In order to keep this article relevant, we’ll refer to […]

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A stored procedure or function can be created with no parameters, IN parameters, OUT parameters, or IN/OUT parameters. There can be many parameters per stored procedure or function.
An IN parameter is a parameter whose value is passed into a stored procedure/function module. The value of an IN parameter is a constant; it can’t be changed […]

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This example demonstrates how to call stored procedures with IN, OUT, and IN/OUT parameters.

CallableStatement cs;
try {
// Call a procedure with no parameters
cs = connection.prepareCall(”{call myproc}”);
cs.execute();

[…]

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When reading and writing text files :

it is almost always a good idea to use buffering (default size is 8K)
it is often possible to use references to abstract base classes, instead of references to specific concrete classes
there is always a need to pay attention to exceptions (in particular, IOException and FileNotFoundException)

The close method :

always needs […]

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