RE: [Jython-users] having problem with pyservlet

[Updike, C. <Cla...@jh...>]

If you check the javadoc for GenericServlet,
<http://java.sun.com/j2ee/sdk_1.3/techdocs/api/javax/servlet/GenericServlet.
html#init(javax.servlet.ServletConfig)>

you should either override the parameterless version of init:

    change def init(self,cnfg): to def init(self):

or call the superclass version of init, viz:

    def init(self, cnfg):
	   http.HttpServlet.init(self, cnfg)

Either should fix it.

-Clark

-----Original Message-----
From: sh...@ro... [mailto:sh...@ro...] 
Sent: Tuesday, March 02, 2004 12:26 PM
To: jyt...@li...
Subject: [Jython-users] having problem with pyservlet


When I try to run the following:

from javax.servlet import http
from com.ziclix.python.sql import zxJDBC

class ValidateLogon(http.HttpServlet):
	def init(self,cnfg):
		url = "jdbc:mysql://localhost/testdb"
		usr = ""
		passwd = ""
		driver = "com.mysql.jdbc.Driver"
		self.db = zxJDBC.connect(url,usr,passwd,driver)
		self.c = self.db.cursor()
		
	def doPost(self,req,res):
		usrname = req.getParameter("username")
		usrpasswd = req.getParameter("password")
		#res.setContentType("text/html")
		out = res.getWriter()
		self.c.execute("select * from users where userid = ? and
pswd = ?", (usrname, usrpasswd))
	        if (self.c.fetchall()) != None:
			rd =
self.getServletContext().getRequestDispatcher("homepage.jsp")
			rd.forward(self,req,res)
		else: res.sendRedirect("invalidlogin.html")
		
	def destroy(self):
		self.c.close()
		self.db.close()

I get the following error message:

java.lang.NullPointerException
	
javax.servlet.GenericServlet.getServletContext(GenericServlet.java:204)
	sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39
)
	
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl
.java:25)
	java.lang.reflect.Method.invoke(Method.java:324)
	
org.python.core.PyReflectedFunction.__call__(PyReflectedFunction.java)
	org.python.core.PyMethod.__call__(PyMethod.java)
	org.python.core.PyObject.__call__(PyObject.java)
	org.python.core.PyInstance.invoke(PyInstance.java)
	org.python.pycode._pyx1.doPost$3(E:\Tomcat
5.0\webapps\jython\ValidateLogon.py:20)
	org.python.pycode._pyx1.call_function(E:\Tomcat
5.0\webapps\jython\ValidateLogon.py)
	org.python.core.PyTableCode.call(PyTableCode.java)
	org.python.core.PyTableCode.call(PyTableCode.java)
	org.python.core.PyTableCode.call(PyTableCode.java)
	org.python.core.PyFunction.__call__(PyFunction.java)
	org.python.core.PyMethod.__call__(PyMethod.java)
	org.python.core.PyObject.__call__(PyObject.java)
	org.python.core.PyObject._jcallexc(PyObject.java)
	org.python.proxies.main$ValidateLogon$1.doPost(Unknown Source)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
	org.python.proxies.main$ValidateLogon$1.service(Unknown Source)

javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
	org.python.util.PyServlet.service(PyServlet.java)


Im running this in Tomcat 5 and can run other jython servlets successfully.
Any pointers on what Im doing wrong will be highly appreciated.

1



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