Jasper compiler error

pls watch the program below...

< % @ page import = "java.sql. *" % >
< %
Connection con = null;
PreparedStatement ps = null;
Public Sub jspInit()
{
Try
{
Class.forName ("oracle.jdbc.driver.OracleDriver");
con = DriverManager.GetConnection ("JDBC:Oracle:Thin:@localhost:1521:ORCL","Scott","Tiger");
PS = con.prepareStatement ("INSERT INTO EMPLOYEE VALUES(?,?,?)");
} //try
catch (ClassNotFoundException e)
{
e.printStackTrace ();
}
catch (SQLException e)
{
e.printStackTrace ();
}
} / / jspinit()
Public Sub jspDestroy()
{
Try
{
if(PS!=null)
PS. Close();
if(con!=null)
con. Close;
}
catch (SQLException e)
{
e.printStackTrace ();
}
} //jspDestroy
% >
< %
String a = request.getParameter ("empno");
String name = request.getParameter ("name");
String c = request.getParameter ("salary").

int empno = Integer.parseInt (a);
float salary = Float.parseFloat (c);
ps.setInt(1,empno);
ps.setString(2,name);
ps.setFloat(3,salary);
ps.executeUpdate ();
% >
< % @ include file="emp.html"% >

When I managed on the tomcat server, compiler jasper gave the following error:+.

An error occurred at line: 5 in the jsp file: emp.jsp
Syntax error on token 'Sub', @ awaited
2: < %
3: connection con = null;
4: PreparedStatement ps = null;
5: public Sub jspInit()
6 : {}
7: try
8 : {}


An error occurred at line: 5 in the jsp file: emp.jsp
jspInit cannot be resolved to a type
2: < %
3: connection con = null;
4: PreparedStatement ps = null;
5: public Sub jspInit()
6 : {}
7: try
8 : {}


An error occurred at line: 5 in the jsp file: emp.jsp
Syntax error, insert 'enum identifier' to full EnumHeaderName
2: < %
3: connection con = null;
4: PreparedStatement ps = null;
5: public Sub jspInit()
6 : {}
7: try
8 : {}


An error occurred at line: 5 in the jsp file: emp.jsp
Syntax error, insert 'EnumBody' to complete BlockStatement
2: < %
3: connection con = null;
4: PreparedStatement ps = null;
5: public Sub jspInit()
6 : {}
7: try
8 : {}


An error occurred at line: 22 in the jsp file: emp.jsp
Syntax error on token 'Sub', @ awaited
19: e.printStackTrace ();
20 :}
21 :} / / jspinit()
22: public Sub jspDestroy()
23: {}
24: try
25: {}


An error occurred at line: 22 in the jsp file: emp.jsp
Syntax error, insert 'enum identifier' to full EnumHeaderName
19: e.printStackTrace ();
20 :}
21 :} / / jspinit()
22: public Sub jspDestroy()
23: {}
24: try
25: {}


An error occurred at line: 22 in the jsp file: emp.jsp
Syntax error, insert 'EnumBody' to complete BlockStatement
19: e.printStackTrace ();
20 :}
21 :} / / jspinit()
22: public Sub jspDestroy()
23: {}
24: try
25: {}





... I don't understand where is the problem. Suggestions please...

Thanks in advance!

Published by: Sandy on November 24, 2010 10:20

The problem is that you try to declare a method in < scriptlet="" %="" %=""> tags.
All methods (for example, jspInit()) must be included in< % !="" déclaration="" tags="" %="">
See http://java.sun.com/products/jsp/syntax/2.0/syntaxref20.html if you don't understand the difference.

But that said
-including the code for scriptlet in JSP page are considered to be bad practice now. JSPs should only be used to generate html pages to display. If you want to run java code, put the java code in a java class (a servlet or a bean)

-connect to a database from a JSP page is also considered bad form, for the same reason. JSPs should be your 'view', not your model or your controller.

-Rather than to use the DriverManager.getConnection () to establish a connection to a database, the recommended method is to use a JNDI Datasource, that can handle the connection pooling for you. In this way, you don't need to worry about the connection at the time of "init" and release to 'destroy '...

see you soon,
evnafets

Tags: Java

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