Example of 'Java Servlet Programming, 2nd Edition' (O'reilly)
Hi,
I'm reading 'Java Servlet Programming, 2nd Edition' (O'reilly).
I got a error "'.' expected" and "cannot resolve symbol"
when trying JSP sample, hello3.jsp and HelloBean.java:
I put hello3jsp to webapps/sample, and HelloBean.class
to webapps/sample/WEB-INF/classes .
Is this collect? If true, why I got the error?
Could you give me any advices?
hello3.jsp:
(http://www.servlets.com/jservlet2/examples/ch18/hello3.jsp.txt)
<%-- hello3.jsp --%>
<%@ page import="HelloBean" %>
<jsp:useBean id="hello" class="HelloBean">
<jsp:setProperty name="hello" property="*" />
</jsp:useBean>
<HTML>
<HEAD><TITLE>Hello</TITLE></HEAD>
<BODY>
<H1>
Hello, <jsp:getProperty name="hello" property="name" />
</H1>
</BODY>
</HTML>HelloBean.java:
(http://www.servlets.com/jservlet2/examples/ch18/HelloBean.java)
public class HelloBean {
private String name = "World";
public void setName(String name) {
this.name = name;
public String getName() {
return name;
}Error Message:
org.apache.jasper.JasperException: Unable to compile class for JSP
An error occurred at line: 4 in the jsp file: /hello3.jsp
Generated servlet error:
[javac] Compiling 1 source file
/usr/local/java/jakarta-tomcat-4.1.18/work/Standalone/localhost/sample/hello3_jsp.java:7: '.' expected
import HelloBean;
^
/usr/local/java/jakarta-tomcat-4.1.18/work/Standalone/localhost/sample/hello3_jsp.java:44: cannot resolve symbol
symbol : class HelloBean
location: class org.apache.jsp.hello3_jsp
HelloBean hello = null;
^regards
maco
I got succeeded!
I changed the three point:
* add 'package hoo;' in HelloBean.java
* add '<%@ page import="my.HelloBean" %>' in hello3.jsp
* change '<jsp:useBean id="hello" class="HelloBean">
to '<jsp:useBean id="hello" class="my.HelloBean">
Before posting, I searched google three times but couldn't get answer.
I could not get well if you didn't give me help...
Thank you very much.
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I changed the three point:
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* Copyright (c) 2000 David Flanagan. All rights reserved.
* This code is from the book Java Examples in a Nutshell, 2nd Edition.
* It is provided AS-IS, WITHOUT ANY WARRANTY either expressed or implied.
* You may study, use, and modify it for any non-commercial purpose.
* You may distribute it non-commercially as long as you retain this notice.
* For a commercial use license, or to purchase the book (recommended),
* visit http://www.davidflanagan.com/javaexamples2.
/** package com.davidflanagan.examples.sql; */
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import java.io.*;
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System.err.println(e);
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out.println(divider);
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static void overwrite(StringBuffer b, int pos, String s) {
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for(int i = 0; i < slen; i++) // copy string into buffer
b.setCharAt(pos+i, s.charAt(i));Don't put those JARs in the lib/ext directory. Only language extensions (e.g., packages that start with "javax") belong in there.
Learn how to set the CLASSPATH properly for starters:
http://java.sun.com/j2se/1.4.2/docs/tooldocs/windows/classpath.html
You might want to look at the JDBC tutorial, too:
http://java.sun.com/docs/books/tutorial/jdbc/
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And also installed tomcat 5.0.28
I have set
CATALINA_HOME==C:\Program Files\Tomcat\jakarta-tomcat-5.0.28
JAVA_HOME ==C:\j2sdk1.4.2_13
CLASS_PATH==
C:\Program Files\Tomcat\jakarta-tomcat-5.0.28\common\lib\servlet-api.jar;
C:\Program Files\Tomcat\jakarta-tomcat-5.0.28\common\lib\jsp-api.jar
PATH ==C:\j2sdk1.4.2_13\bin;C:\Program Files\Tomcat\jakarta-tomcat-5.0.28\bin;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem
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MY sevlet program is
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class HelloServlet extends HttpServlet {
public void doGet(HttpServletRequest request,
HttpServletResponse response)
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response.setContentType("text/html");
PrintWriter out = response.getWriter();
String docType =
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"Transitional//EN\">\n";
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"<HEAD><TITLE>Hello</TITLE></HEAD>\n" +
"<BODY BGCOLOR=\"#FDF5E6\">\n" +
"<H1>Hello</H1>\n" +
"</BODY></HTML>");
ERRORS are:
Pakage javax.servlet does not exist
Pakage javax.servlet.http does not exist
cannot resolve symbol HttpServletRequest
and similar errors
can anyone guide me?
Message was edited by:
Learnit's not CLASS_PATH, it's CLASSPATH.
Directory paths with spaces in them are problematic. Surround them with double quotes.
I think the best thing is not a CLASSPATH environment variable. Better to use the -classpath option on javac.exe when you compile.
So your command to compile might look something like:
javac -classpath .;"C:\Program Files\Tomcat\jakarta-tomcat-5.0.28\common\lib\servlet-api.jar" *.java% -
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</servlet-mapping>
<!-- other servlets mappings -->
</web-app>Now, once the container starts (Tomcat?), you should be able to see that servlet in:
http://localhost:8080/[my-context/]MyServletAnd what my-context is? The web application context. This string should be empty if your're deploying to the root context, otherwise should the context name. In Tomcat, deploying to root context defaults to using webapps/ROOT.
Sorry for my English, but I felt the need to answer your request. I hope it helps despite my writing. -
Logical error 2nd Edition... :~(
here is the 2nd edition of the program.
it runs wired, i can't exactly tell how, but the way it does just like lost-control.
copy it and give it a try see if you have any idea what's going on.
p.s. all called methods are sticked after the main program.
class DecodeDriver
public static void main(String[] args)
char keyin;
do
sop("**********************************************");
sop("**********************************************");
sop("** M A I N M E N U **");
sop("** ~~~~~~~~~~~~~~~~~~~~~~~~ **");
sop("** ======================================== **");
sop("** M) Morse Code **");
sop("** C) Caesar Cipher **");
sop("** V) Vignere Cipher **");
sop("** P) Playfair Cipher **");
sop("** ---------------------------------------- **");
sop("** X) Exit Program **");
sop("** **");
sop("**********************************************");
sop("**********************************************");
sop(" ");
sop("Please select an encoding scheme: ");
keyin = SavitchIn.readNonwhiteChar();
switch(keyin)
case'M':
case'm': Morse();
break;
case'C':
case'c': Caesar();
break;
case'V':
case'v': Vignere();
break;
case'P':
case'p': Playfair();
break;
case'X':
case'x': sop("Thanks for using! Bye!");
break;
default: sop("Invalid Key Entered. Please select one from the menu.");
break;
} //switch
} // do
while(keyin != 'X' && keyin != 'x');
System.exit(0);
} // main
public static void Morse()
char subKeyin;
sop("**********************************************");
sop("**********************************************");
sop("** Morse Code Menu **");
sop("** ~~~~~~~~~~~~~~~~~~~~~~~~ **");
sop("** ======================================== **");
sop("** E) Encode **");
sop("** D) Decode **");
sop("** ---------------------------------------- **");
sop("** X) Return to Main Program **");
sop("** **");
sop("**********************************************");
sop("**********************************************");
sop(" ");
sop("Please select to encoding / decoding: ");
subKeyin = SavitchIn.readNonwhiteChar();
switch(subKeyin)
case'E':
case'e': MorseCode.encode();
break;
case'D':
case'd': MorseCode.decode();
break;
case'X':
case'x': sop("Returning to main menu...");
break;
default: sop("Invalid Key Entered. Please select one from the menu.");
break;
} // switch
} //Morse
private static void Caesar()
char subKeyin = SavitchIn.readNonwhiteChar();
sop("**********************************************");
sop("**********************************************");
sop("** Caesar Cipher Menu **");
sop("** ~~~~~~~~~~~~~~~~~~~~~~~~ **");
sop("** ======================================== **");
sop("** E) Encode **");
sop("** D) Decode **");
sop("** ---------------------------------------- **");
sop("** X) Return to Main Program **");
sop("** **");
sop("**********************************************");
sop("**********************************************");
sop(" ");
sop("Please select to encoding / decoding: ");
switch(subKeyin)
case'E':
case'e': CaesarCipher.encode();
case'D':
case'd': CaesarCipher.decode();
case'X':
case'x': sop("Returning to main menu...");
break;
default: sop("Invalid Key Entered. Please select one from the menu.");
} // switch
} //CaesarCipher
private static void Vignere()
char subKeyin = SavitchIn.readNonwhiteChar();
sop("**********************************************");
sop("**********************************************");
sop("** Vignere Cipher Menu **");
sop("** ~~~~~~~~~~~~~~~~~~~~~~~~ **");
sop("** ======================================== **");
sop("** E) Encode **");
sop("** D) Decode **");
sop("** ---------------------------------------- **");
sop("** X) Return to Main Program **");
sop("** **");
sop("**********************************************");
sop("**********************************************");
sop(" ");
sop("Please select to encoding / decoding: ");
switch(subKeyin)
case'E':
case'e': VignereCipher.encode();
case'D':
case'd': VignereCipher.decode();
case'X':
case'x': sop("Returning to main menu...");
break;
default: sop("Invalid Key Entered. Please select one from the menu.");
} // switch
} //VignereCipher
private static void Playfair()
char subKeyin = SavitchIn.readNonwhiteChar();
sop("**********************************************");
sop("**********************************************");
sop("** Playfair Cipher Menu **");
sop("** ~~~~~~~~~~~~~~~~~~~~~~~~ **");
sop("** ======================================== **");
sop("** E) Encode **");
sop("** D) Decode **");
sop("** ---------------------------------------- **");
sop("** X) Return to Main Program **");
sop("** **");
sop("**********************************************");
sop("**********************************************");
sop(" ");
sop("Please select to encoding / decoding: ");
switch(subKeyin)
case'E':
case'e': PlayfairCipher.encode();
case'D':
case'd': PlayfairCipher.decode();
case'X':
case'x': sop("Returning to main menu...");
break;
default: sop("Invalid Key Entered. Please select one from the menu.");
} // switch
} //PlayfairCipher
private static void sop(String newString)
System.out.println(newString);
} // sop
} //class
(part of)the SavitchIn input stuff:
public static char readNonwhiteChar( )
char next;
next = readChar( );
while (Character.isWhitespace(next))
next = readChar( );
return next;
The following methods are not used in the text, except
for a brief reference in Chapter 2. No program code uses
them. However, some programmers may want to use them.
Precondition: The next input in the stream consists of
an int value, possibly preceded by whitespace, but
definitely followed by whitespace.
Action: Reads the first string of nonwhitespace characters
and returns the int value it represents. Discards the
first whitespace character after the word. The next read
takes place immediately after the discarded whitespace.
In particular, if the word is at the end of a line, the
next read will take place starting on the next line.
If the next word does not represent an int value,
a NumberFormatException is thrown.
MorseCode.java - for debugin' propose.
class MorseCode
public MorseCode()
sop("unfinished - const.");
}//const.
public static void encode()
sop("unfinished - encode");
char newchar;
newchar = SavitchIn.readChar();
System.out.println(newchar);
public static void decode()
sop("unfinished - decode");
private static void sop(String newString)
System.out.println(newString);
} // sop
}//classaside from the missing breaks?
encode OR decode
case'E':
case'e': CaesarCipher.encode();
break;
case'D':
case'd': CaesarCipher.decode();
break;looks better this time?
class DecodeDriver
public static void main(String[] args)
char keyin;
do
sop("**********************************************");
sop("**********************************************");
sop("** M A I N M E N U **");
sop("** ~~~~~~~~~~~~~~~~~~~~~~~~ **");
sop("** ======================================== **");
sop("** M) Morse Code **");
sop("** C) Caesar Cipher **");
sop("** V) Vignere Cipher **");
sop("** P) Playfair Cipher **");
sop("** ---------------------------------------- **");
sop("** X) Exit Program **");
sop("** **");
sop("**********************************************");
sop("**********************************************");
sop(" ");
sop("Please select an encoding scheme: ");
keyin = SavitchIn.readNonwhiteChar();
switch(keyin)
case'M':
case'm': Morse();
break;
case'C':
case'c': Caesar();
break;
case'V':
case'v': Vignere();
break;
case'P':
case'p': Playfair();
break;
case'X':
case'x': sop("Thanks for using! Bye!");
break;
default: sop("Invalid Key Entered. Please select one from the menu.");
break;
} //switch
} // do
while(keyin != 'X' && keyin != 'x');
System.exit(0);
} // main
public static void Morse()
char subKeyin;
sop("**********************************************");
sop("**********************************************");
sop("** Morse Code Menu **");
sop("** ~~~~~~~~~~~~~~~~~~~~~~~~ **");
sop("** ======================================== **");
sop("** E) Encode **");
sop("** D) Decode **");
sop("** ---------------------------------------- **");
sop("** X) Return to Main Program **");
sop("** **");
sop("**********************************************");
sop("**********************************************");
sop(" ");
sop("Please select to encoding / decoding: ");
subKeyin = SavitchIn.readNonwhiteChar();
switch(subKeyin)
case'E':
case'e': MorseCode.encode();
break;
case'D':
case'd': MorseCode.decode();
break;
case'X':
case'x': sop("Returning to main menu...");
break;
default: sop("Invalid Key Entered. Please select one from the menu.");
break;
} // switch
} //Morse
private static void Caesar()
char subKeyin;
sop("**********************************************");
sop("**********************************************");
sop("** Caesar Cipher Menu **");
sop("** ~~~~~~~~~~~~~~~~~~~~~~~~ **");
sop("** ======================================== **");
sop("** E) Encode **");
sop("** D) Decode **");
sop("** ---------------------------------------- **");
sop("** X) Return to Main Program **");
sop("** **");
sop("**********************************************");
sop("**********************************************");
sop(" ");
sop("Please select to encoding / decoding: ");
subKeyin = SavitchIn.readNonwhiteChar();
switch(subKeyin)
case'E':
case'e': CaesarCipher.encode();
break;
case'D':
case'd': CaesarCipher.decode();
break;
case'X':
case'x': sop("Returning to main menu...");
break;
default: sop("Invalid Key Entered. Please select one from the menu.");
break;
} // switch
} //CaesarCipher
private static void Vignere()
char subKeyin;
sop("**********************************************");
sop("**********************************************");
sop("** Vignere Cipher Menu **");
sop("** ~~~~~~~~~~~~~~~~~~~~~~~~ **");
sop("** ======================================== **");
sop("** E) Encode **");
sop("** D) Decode **");
sop("** ---------------------------------------- **");
sop("** X) Return to Main Program **");
sop("** **");
sop("**********************************************");
sop("**********************************************");
sop(" ");
sop("Please select to encoding / decoding: ");
subKeyin = SavitchIn.readNonwhiteChar();
switch(subKeyin)
case'E':
case'e': VignereCipher.encode();
break;
case'D':
case'd': VignereCipher.decode();
break;
case'X':
case'x': sop("Returning to main menu...");
break;
default: sop("Invalid Key Entered. Please select one from the menu.");
break;
} // switch
} //VignereCipher
private static void Playfair()
char subKeyin;
sop("**********************************************");
sop("**********************************************");
sop("** Playfair Cipher Menu **");
sop("** ~~~~~~~~~~~~~~~~~~~~~~~~ **");
sop("** ======================================== **");
sop("** E) Encode **");
sop("** D) Decode **");
sop("** ---------------------------------------- **");
sop("** X) Return to Main Program **");
sop("** **");
sop("**********************************************");
sop("**********************************************");
sop(" ");
sop("Please select to encoding / decoding: ");
subKeyin = SavitchIn.readNonwhiteChar();
switch(subKeyin)
case'E':
case'e': PlayfairCipher.encode();
break;
case'D':
case'd': PlayfairCipher.decode();
break;
case'X':
case'x': sop("Returning to main menu...");
break;
default: sop("Invalid Key Entered. Please select one from the menu.");
break;
} // switch
} //PlayfairCipher
private static void sop(String newString)
System.out.println(newString);
} // sop
} //class -
User Role problems in Sun Java Application Server Platform Edition 8
I am having two problems setting up user roles in Sun Java Application Server Platform Edition 8. At first, I thought that it was a problem with the higher level features that I was using, so I created a very simple example using the simplest authentication I can use, but the problem still occurs. I am using the file realm and configuring the users in the App Server Admin Console. I create 2 users in different roles. One user should have access, the other should not.
1) The first problem is that both users can access the page
2) The second problem is that the isUserInRole() method returns false for both users with the role that it should be authenticating against.
Here is a sample of my code:
Users Configured in Console:
username password roles
user1 ********** admin
user2 ********** noaccess
web.xml
<security-role>
<role-name>admin</role-name>
</security-role>
<security-constraint>
<web-resource-collection>
<web-resource-name>My Protected Area</web-resource-name>
<url-pattern>/*</url-pattern>
</web-resource-collection>
<auth-constraint>
<role-name>admin</role-name>
</auth-constraint>
<user-data-constraint>
<transport-guarantee>NONE</transport-guarantee>
</user-data-constraint>
</security-constraint>
<login-config>
<auth-method>BASIC</auth-method>
<realm-name>file</realm-name>
</login-config>
<servlet>
<servlet-name>
TestServlet
</servlet-name>
<servlet-class>
mypackage.TestServlet
</servlet-class>
<security-role-ref>
<role-name>admin</role-name>
<role-link>admin</role-link>
</security-role-ref>
</servlet>
<servlet-mapping>
<servlet-name>
TestServlet
</servlet-name>
<url-pattern>
/TestServlet
</url-pattern>
</servlet-mapping>
TestServlet.java:
out.println("admin role: " + request.isUserInRole("admin") + "<BR/>");
Thanks before hand for any responses.
- BrianHi Jeanfrancois,
Your suggestion has lead me to find my problem. There were actually three problems.
1) First, you suggestion to reorder my xml file did not cause any errors to occur. I got suspicious that my web.xml file was wrong. I looked at some sample web-xml files and found that I was missing the header as follows:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE web-app PUBLIC '-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN' 'http://java.sun.com/dtd/web-app_2_3.dtd'>
2) When I added this information, the deploy feature failed stating the my web.xml file was out of order. I fixed the ordering. It now deployed, but the security still wasn't working.
3) I then added the sun-web.xml file. This file was missing before hand as I thought it was unnessary. However, this file added the essential mapping from a role to a group. After adding this, it now started to work.
Thanks so much for you time and effort. You really did help me.
- Brian Blank -
I have jsdk2, but I can't compile servlet program
I have jsdk2 version. which create in my c:\ dirve a folder jdk1.3. I do all the program from that. But I found that some of the class files of Servlet (servletRespose etc ) is missing. What I do to recover that. Even I can't compile any servlet program from that. Pls reply to my problems.
Regards.
RanjanThe Servlet API is part of J2EE (Java 2 Enterprise Edition). It is not included in the Standard Edition.
So you need to download and install the J2EE reference implementation or another servlet engine such as Apache Tomcat ( http://jakarta.apache.org/tomcat ). Don't forget to put the Tomcat JAR files in your CLASSPATH when compiling your servlet program.
Jesper -
Please help me to use javamail to send mail in servlet program
hi
i want to send simple mail from user [email protected] to user [email protected] using servlet program
i can't compile the javamail demo program servlet "JavaMailServlet.java".
i have this exception
Note: SendMailServlet.java uses or overrides a deprecated API.
Note: Recompile with -deprecation for details.
i don't no how to do
please help me if you have code
thank'sGiven that you're having problems with your [url http://forum.java.sun.com/thread.jsp?forum=43&thread=536278&tstart=0&trange=30]demo mail code as well as your demo servlet code, perhaps you would be better served by learning about JavaMail, servlets, and perhaps Java in general (for example - the meaning of deprecated). Then you may be able to build your own servlet for handling mail or at least will be able to revise the demo code found elsewhere.
Of course, if the purpose is really not to learn how to use Java, JavaMail, servlets, etc. but to simply create something that works then you could always hire someone to write the program for you.
This is not intended to be rude or anything - just an observation and some food for thought.
∞ brewman ∞
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