getServletContext null pointer

[Al Hollis]

Please can ya help me out yet again wise ones

I have two servlets, and 1 bean. In one servlet i set the values of the bean and store them in the servlet context. In another servlet i try to get the ServletContext back, But it allways returns a null pointer error...

Here is the code, thanks in advance for help.

setUp.java

  
 dbParams = new DbParameters();

ServletContext bob = getServletContext();
 
serverAdd = request.getParameter("serverAdd");
mysqlDBName = request.getParameter("mysqlDBName");
dbParams.setMysqlURL(serverAdd,mysqlDBName);
 
mysqlName = request.getParameter("mysqlName");
dbParams.setUsername(mysqlName);
mysqlPass = request.getParameter("mysqlPass");
dbParams.setPassword(mysqlPass);
 
bob.setAttribute("dbParams",dbParams);

out.println(dbParams.getMysqlURL()+"<BR>");
out.println(dbParams.getUsername()+"<BR>");
out.println(dbParams.getPassword()+"<BR>");

getConnection.java

  
ServletContext bob = getServletContext();
 
 
      dbParam = (DbParameters) bob.getAttribute("dbParams");
      String mysqlURL = dbParam.getMysqlURL();
String username = dbParam.getUsername();
String password = dbParam.getPassword();
  try {
connection = DriverManager.getConnection(mysqlURL, username, password);
}
catch ( Exception e)
{ return 2;}
     //Successfull connection
 return 0;
 }

And finally the bean

  
package beans;
 
public class DbParameters
{
public String host;
public String dbName;
public String mysqlURL;
public String username;
public String password;
 
 
public DbParameters()
{
 
 
}
 
public void setHost(String s)
{host = s;}
public String getHost()
{return host;}
 
 
public void setDbName(String s)
{dbName = s;}
public String getDbName()
{return dbName;}
 
 
public void setMysqlURL(String s, String t)
{mysqlURL= "jdbc:mysql://" +s+ "/" +t;}
public String getMysqlURL()
{return mysqlURL;}
 
 
public void setUsername(String s)
{username = s;}
public String getUsername()
{return username;}
 
 
public void setPassword(String s)
{password = s;}
public String getPassword()
{return password;}
 
}

If you got this far, thanks for looking
[ December 24, 2005: Message edited by: Bear Bibeault ]

[William Brogden]

1. are both servlets in the same "Web application"?
are both defined in one web.xml?
2. you left out one crucial bit of information - which reference is null?
is it bob? if so maybe your init method is at fault and you are missing the ServletConfig reference
is it dbParam? if so maybe the two servlets are not really sharing the same context
3. are you relying on the "invoker" servlet at any point? See this Ranch FAQ if you are.
Bill

[Al Hollis]

well ive kinda sorted the problem now using instance rather that servlet context to store it...

However i would like to switch back to servlet context as my tutor seems to prefer this

Bob is the place where it throws a null reference back at me,
They are both in one web application, i havnt used any init meathods so not sure how that can be the case. Its really got me stumped, ohh and no invoker meathod either...

Thanks for looking!
[ December 24, 2005: Message edited by: Al Hollis ]

[Paul Clapham]

Bob is the place where it throws a null reference back at me

This is rather ambiguous. Are you saying that the variable "bob" contains null? Surely not. Why don't you tell us which line of code throws the exception? Your stack trace should tell you the exact line number.