call java class from jsp

Question

<%@ page language="java" import="DBConnect"%> <% try { System.out.println("\n--------------------"); System.out.println("\n loading .."); DBConnect.connectToDb(); %> <h3>Connection ok</h3> <% } catch(Exception e) { e.printStackTrace(); } %>

gives me following error how to load java class in jsp

org.apache.jasper.JasperException: Unable to compile class for JSP: An error occurred at line: 12 in the generated java file The import DBConnect cannot be resolved An error occurred at line: 16 in the jsp file: /applicationservices/fileshare/vm/TestJdbc.jsp DBConnect cannot be resolved 13: System.out.println("\n--------------------"); 14: System.out.println("\n loading .."); 15: 16: DBConnect.connectToDb(); 17: 18: %> 19:

ChadNC · Accepted Answer · 2012-06-12 11:31:12Z

You need to create a package for the application which would be something like

com.yourappname.data

then create your DBConenct class in that package or refactor it in there so that when you need to import the class you do so by using

import com.yourappname.data.DBConnect

The you can import and use the class in your jsp

<%@page import="com.yourappname.data.DBConnect"%>

On a side note, you shouldn't be doing any database acces within the jsp you should instead be doing all of your data access within a servlet.

tibtof · Accepted Answer · 2012-06-12 10:17:37Z

0

Add the package prefix to DBConnect:

<%@ page language="java" import="full.package.path.DBConnect"%>

Where full.package.path is the actual package of DBConnect.

answered Jun 12, 2012 at 10:17

tibtof

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5 Comments

ybc126 Over a year ago

@ tibtof: there is no package i directly put my DBConnect.class file in class dir

Philipp Reichart Over a year ago

@ybc126 Don't do that, the default package (aka "directly in the class dir") is inherently broken (as shown here). Always use a package to avoid this other namespace problems. Things in the default package cannot be reference reliably from other locations.

ybc126 Over a year ago

@Philipp Reichart: now I put my class file db directory now error is Only a type can be imported. db.DBConnect resolves to a package An error occurred at line: 17 in the jsp DBConnect cannot be resolved

tibtof Over a year ago

Can you please update the code in your question with the latest changes?

ybc126 Over a year ago

@tibtof: there are no changes.

chaitu · Accepted Answer · 2012-06-12 10:33:17Z

0

class should be public and methods also should be declared as public

edited Jun 12, 2012 at 10:33

answered Jun 12, 2012 at 10:27

chaitu

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Comments

Sai Ye Yan Naing Aye · Accepted Answer · 2012-06-12 11:47:45Z

You page has no error. Please clean and build your project again and retest it.Putting your class in some package is good practice but without using this is no problem for test project.

stevedbrown · Accepted Answer · 2012-06-12 11:53:23Z

Make sure you see

DBConnect.class

in your

WEB-INF/classes

directory. If it's not there, the class isn't on your classpath if you are running in tomcat or similar.

@ stevedbrown: my DBConnect.class file is in WEB-INF/classes directory

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