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cannot activate a web application with database

Cathy Valdez
Greenhorn

Joined: Oct 22, 2003
Posts: 23
The topic is Integrating a Web Application With a Database
Below are softwares installed in my PC:
OS=Windows98
Tomcat v. 4.1.27.exe
J2SE/JDK v. 1.3.1
mysql
mysql-connector-java

Below is the content of Autoexec.bat:

Compilation of servlet files below were successful.
InitializeConnectionPool.java
ScrambleGameServlet.java
NamingService.java
ScrambleGameService.java
Word.java
WordCategory.java
WordCategoryDAO.java
WordCategoryService.java
WordDAO.java

Below is the content of the deployment descriptor -web.xml:

The database wordgames above is located at the directory below:

Below are files inside the directory above:
wordcategory.frm
wordcategory.MYI
wordcategory.MYD
word.frm
word.MYI
word.MYD
wordhint.frm
wordhint.MYI
wordhint.MYD

To activate the Scramble Game Servlet, using a Web Browser, I entered the URL below:

Below is the displayed page form for the URL above:
Duke's Arcade
Select from one of the following games:

Word Scramble
When I clicked the Word Scramble above, errors below occured:

What do errors above mean? What should I do to correct those errors so to run this Web application with database in my PC? Can anybody there help?
Any suggestions would greatly be appreciated.
Thanks in advance.
Regards,
Cathy
Tim Baker
Ranch Hand

Joined: Oct 04, 2003
Posts: 541
this is the most important part to look at:
java.lang.NullPointerException
at sl314.domain.WordCategoryDAO.selectAllCategories(WordCategoryDAO.java:38)
NullPointer means that you tried to access something on an object which had not been asigned yet, ie the reference was null. For example you get it when you do this:
String myString;
myString.toString();
when you need to make myString into something before you call a method. ie
String myString = new String("Hallo");
myString.toString();
look at line 38 of WordCategoryDAO because you have an error like this!


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Tim Baker
Ranch Hand

Joined: Oct 04, 2003
Posts: 541
if you want more detailed help you must post this code for us to look at !
Bear Bibeault
Author and ninkuma
Marshal

Joined: Jan 10, 2002
Posts: 61437
    
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Please do not cross-post the same question in multiple forums.
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Valentin Crettaz
Gold Digger
Sheriff

Joined: Aug 26, 2001
Posts: 7610
You can continue this discussion at http://www.coderanch.com/t/299608/JDBC/java/cannot-activate-web-application-database
This topic is now closed. Thank you


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