Java Database Connectivity (JDBC)

Hi, I'm having problems compiling the following code

private void toInsert(String insert_foo, int insert_bar) {
		InitialContext context = null;
		Connection conn = null;
		PreparedStatement pstmt= null;	
		try {
			context = new InitialContext();
			DataSource ds = (DataSource) context.lookup("java:comp/env/jdbc/TestDB");
			conn = ds.getConnection();
			conn.setAutoCommit(false);
			pstmt = conn.prepareStatement("INSERT into testdata values(?, ?)");
			pstmt.setString(1, insert_foo);
			pstmt.setInt(2, insert_bar);

			pstmt.executeUpdate();
			conn.commit();
			conn.setAutoCommit(true);
			
			pstmt.close();
			pstmt = null;
			conn.close();
			conn = null;
			context.close();
			context = null;
		}
		catch (Exception e) {
			conn.rollback();
		}
		finally {
			if (pstmt != null) {
				try { pstmt.close(); }		
				catch (SQLException e) {;}	
				pstmt = null;			
			}
			if (conn != null) {
				try { conn.close(); }		
				catch (SQLException e) {;}	
				conn = null;			
			}
			if (context != null) {
				try { context.close(); }	
				catch (NamingException e) {;}	
				context = null;			
			}
		}
	}

I got this error when I try to compile the above;

unreported exception java.sql.SQLException; must be caught or declared to be thrown
conn.rollback();

I search and read through a lot of posts here that rollback() could be used in the catch block but why I can't I compile it?

Please help me out, thank you.

puzzled....