JDBC insert Statement not working

You should always use PreparedStatements for this kind of thing. It takes care of quoting for you and protects you from SQL injection attacks:

PreparedStatement statement = connection.prepareStatement("INSERT INTO history (to, subject, body) VALUES (?, ?, ?)");
statement.setString(1, DATA1);
statement.setString(2, DATA2);
statement.setString(3, DATA3);
statement.execute();

Not only that, but the database driver can compile and cache prepared statements, potentially making them much more efficient.

Note that the setString indices are 1-based, not zero-based.

sa.executeUpdate("INSERT INTO history (to, subject, body)"+"VALUES("+ DATA1 + "','" + DATA2 + "','" +DATA3+ "')'");

This code will produce query like this:

INSERT INTO history (to, subject, body)VALUES(vinesh','raja','1111')'

You have to remove single quotes after the last ')' and add single quote after 'VALUES'.

Instead try this code:

sa.executeUpdate("INSERT INTO history (to, subject, body)"+"VALUES('"+ DATA1 + "','" + DATA2 + "','" +DATA3+ "')");

As Vinesh Suggested the solution, I would simply like to tell, better you take one variable as

String query="SQL QUERY";
then just do System.out.println(query);

then run the line,

PreparedStatement statement = connection.prepareStatement(query)

so that, you will correctly identify the final query formed.

1.Rather than using String Class use String Buffer or String Builder which is a mutable class. On the other hand, String Class is immutable. You can use String Buffer like

1. String Buffer stbuffer = new String Buffer();

   stbuffer.append("insert into ");
   stbuffer.append("<tablename> ");
   stbuffer.append("<fields >");
   stbuffer.append(" values");
   stbuffer.append("(+");
   stbuffer.append(String);
   stbuffer.append(")");  ....etc
   

2. You can get the final string representation using stbufffer.toString();

3. You can insert this type of queries to exceute update() methods like ins.executeUpdate(stbuffer.toString);

4. You can also use it like this for Insert statement and also for Prepared Statement