Programming Forums > Application Development > Java

lucifer · Jun 8th, 2007, 4:44 AM

Hi i m learning java n
i have written the following program but it does not compile

import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class Simple implements Filter
{
	 public void doFilter(ServletRequest request, ServletResponse response,    FilterChain chain)
    throws IOException, ServletException
  {
  
  }

  public void destroy()
  {
   
  }

  public void init(FilterConfig filterConfig)
  {
   
  }

}

(Toggle Plain Text)

when i come i get following errors
simple.java:4: class Simple is public, should be declared in a file named Simple.java
public class Simple implements Filter
       ^
simple.java:2: package javax.servlet does not exist
import javax.servlet.*;
^
simple.java:3: package javax.servlet.http does not exist
import javax.servlet.http.*;
^
simple.java:4: cannot find symbol
symbol: class Filter
public class Simple implements Filter
                               ^
simple.java:6: cannot find symbol
symbol  : class ServletRequest
location: class Simple
	 public void doFilter(ServletRequest request, ServletResponse response,
	                      ^
simple.java:6: cannot find symbol
symbol  : class ServletResponse
location: class Simple
	 public void doFilter(ServletRequest request, ServletResponse response,
	                                              ^
simple.java:7: cannot find symbol
symbol  : class FilterChain
location: class Simple
    FilterChain chain)
    ^
simple.java:8: cannot find symbol
symbol  : class ServletException
location: class Simple
    throws IOException, ServletException
                        ^
simple.java:18: cannot find symbol
symbol  : class FilterConfig
location: class Simple
  public void init(FilterConfig filterConfig)

plz help

Dameon · Jun 8th, 2007, 5:37 AM

The errors explain themselves.

(Toggle Plain Text)

simple.java:4: class Simple is public, should be declared in a file named Simple.java

...your class should be declared in a file named Simple.java
Public classes in Java need to be in a file by the same name.

(Toggle Plain Text)

simple.java:2: package javax.servlet does not exist

javax.servlet doesn't exist. Note that it is part of the enterprise edition (J2EE), rather than the standard edition. You need to have the right distribution installed in order to use these features.

The "cannot find symbol" errors are a simple consequence of the imaginary javax.servlet package. When that problem is corrected, the compiler will know where to find them

lucifer · Jun 8th, 2007, 6:51 AM

Quote:

Originally Posted by Dameon

The errors explain themselves.

(Toggle Plain Text)

simple.java:4: class Simple is public, should be declared in a file named Simple.java

...your class should be declared in a file named Simple.java
Public classes in Java need to be in a file by the same name.

(Toggle Plain Text)

simple.java:2: package javax.servlet does not exist

javax.servlet doesn't exist. Note that it is part of the enterprise edition (J2EE), rather than the standard edition. You need to have the right distribution installed in order to use these features.

The "cannot find symbol" errors are a simple consequence of the imaginary javax.servlet package. When that problem is corrected, the compiler will know where to find them

first error i have corrected and i have java enterprise edition installed but still these errors come

ReggaetonKing · Jun 8th, 2007, 9:40 AM

If you are using windows, did you set Java EE's bin directory in your CLASSPATH?

msi_333 · Jun 9th, 2007, 10:13 AM

Why don't you use NetBeans IDE and make the life easier to you .It is already contain J2ee and Tomcat built in and when you run your program it open the browser for you .what you will do is write the code and press the button to run

Download it from here ,

http://www.netbeans.org/

Jun 8th, 2007, 4:44 AM	#1
lucifer Programmer Join Date: Oct 2005 Posts: 84 Rep Power: 4	Noob Java Error Hi i m learning java n i have written the following program but it does not compile (Toggle Plain Text) import java.io.; import javax.servlet.; import javax.servlet.http.; public class Simple implements Filter { public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { } public void destroy() { } public void init(FilterConfig filterConfig) { } } import java.io.; import javax.servlet.; import javax.servlet.http.; public class Simple implements Filter { public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { } public void destroy() { } public void init(FilterConfig filterConfig) { } } (Toggle Plain Text) when i come i get following errors simple.java:4: class Simple is public, should be declared in a file named Simple.java public class Simple implements Filter ^ simple.java:2: package javax.servlet does not exist import javax.servlet.; ^ simple.java:3: package javax.servlet.http does not exist import javax.servlet.http.; ^ simple.java:4: cannot find symbol symbol: class Filter public class Simple implements Filter ^ simple.java:6: cannot find symbol symbol : class ServletRequest location: class Simple public void doFilter(ServletRequest request, ServletResponse response, ^ simple.java:6: cannot find symbol symbol : class ServletResponse location: class Simple public void doFilter(ServletRequest request, ServletResponse response, ^ simple.java:7: cannot find symbol symbol : class FilterChain location: class Simple FilterChain chain) ^ simple.java:8: cannot find symbol symbol : class ServletException location: class Simple throws IOException, ServletException ^ simple.java:18: cannot find symbol symbol : class FilterConfig location: class Simple public void init(FilterConfig filterConfig) when i come i get following errors simple.java:4: class Simple is public, should be declared in a file named Simple.java public class Simple implements Filter ^ simple.java:2: package javax.servlet does not exist import javax.servlet.; ^ simple.java:3: package javax.servlet.http does not exist import javax.servlet.http.; ^ simple.java:4: cannot find symbol symbol: class Filter public class Simple implements Filter ^ simple.java:6: cannot find symbol symbol : class ServletRequest location: class Simple public void doFilter(ServletRequest request, ServletResponse response, ^ simple.java:6: cannot find symbol symbol : class ServletResponse location: class Simple public void doFilter(ServletRequest request, ServletResponse response, ^ simple.java:7: cannot find symbol symbol : class FilterChain location: class Simple FilterChain chain) ^ simple.java:8: cannot find symbol symbol : class ServletException location: class Simple throws IOException, ServletException ^ simple.java:18: cannot find symbol symbol : class FilterConfig location: class Simple public void init(FilterConfig filterConfig) plz help __________________ "You're good... but me, I'm magic"

Jun 8th, 2007, 5:37 AM	#2
Dameon Troll Join Date: Apr 2005 Location: Texas Posts: 732 Rep Power: 4	The errors explain themselves. (Toggle Plain Text) simple.java:4: class Simple is public, should be declared in a file named Simple.java simple.java:4: class Simple is public, should be declared in a file named Simple.java ...your class should be declared in a file named Simple.java Public classes in Java need to be in a file by the same name. (Toggle Plain Text) simple.java:2: package javax.servlet does not exist simple.java:2: package javax.servlet does not exist javax.servlet doesn't exist. Note that it is part of the enterprise edition (J2EE), rather than the standard edition. You need to have the right distribution installed in order to use these features. The "cannot find symbol" errors are a simple consequence of the imaginary javax.servlet package. When that problem is corrected, the compiler will know where to find them __________________ MD5(sig) = bcef75433db02e9ad9bf81d6f7c5c270

Jun 8th, 2007, 9:40 AM	#4
ReggaetonKing Sexy Programmer Join Date: Nov 2005 Location: New Jersey Posts: 891 Rep Power: 3	If you are using windows, did you set Java EE's bin directory in your CLASSPATH? __________________ I would love to change the world, but they won't give me the source code!

Jun 9th, 2007, 10:13 AM	#5
msi_333 Newbie Join Date: May 2007 Location: Egypt Posts: 19 Rep Power: 0	Why don't you Why don't you use NetBeans IDE and make the life easier to you .It is already contain J2ee and Tomcat built in and when you run your program it open the browser for you .what you will do is write the code and press the button to run Download it from here , http://www.netbeans.org/ __________________ Don't walk in front of me, I may not follow. Don't walk behind me, I may not lead. Just walk beside me and be my friend

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