Re: Question about context-param

[Mike Roest]

Sorry 2 different Contexts, and my brain was all messed up. When I'm refering to my Context Constructor it's actually the main servlet constructor (which in our app is PolarisContext). Which extends HttpServlet.

Sorry for the confusion
Shapira, Yoav wrote:

Howdy,
Your context constructor? What's that? Last I checked,
javax.servlet.ServletContext was an interface, and the container
provides an implementation.
If you want to tie into the context lifecycle, which is a very valid
design, use a ServletContextListener implementation. The context
parameters are available in that listener's contextInitialized() method.

Yoav Shapira
Millennium ChemInformatics

-----Original Message-----
From: Mike Roest [mailto:[EMAIL PROTECTED]]
Sent: Thursday, January 16, 2003 1:49 PM
To: [EMAIL PROTECTED]
Subject: Question about context-param

Hi all,
	I'm trying to initialize a few parameters from my web.xml to be
available to my context.

I'm just wondering when they become available.  As I'm attempting to
access them during my Context constructor and I'm getting to following
exception trace.

(This call was just trying to get the names not actually access the
values but trying to access the values give similar results)

java.lang.NullPointerException
at
javax.servlet.GenericServlet.getInitParameterNames(GenericServlet.java:

167)

at polaris.servlet.PolarisContext.<init>(PolarisContext.java:54)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native

Method)

at
sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructor

Acce

ssorImpl.java:39)
at
sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingCon

stru

ctorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:274)
at java.lang.Class.newInstance0(Class.java:296)
at java.lang.Class.newInstance(Class.java:249)
at

org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.

java:902)
at

org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:821)

at
org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.

java

:3420)
at

org.apache.catalina.core.StandardContext.start(StandardContext.java:3

608)
at

org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1188)

at org.apache.catalina.core.StandardHost.start(StandardHost.java:738)
at

org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1188)

at

org.apache.catalina.core.StandardEngine.start(StandardEngine.java:347

)
at

org.apache.catalina.core.StandardService.start(StandardService.java:4

97)
at

org.apache.catalina.core.StandardServer.start(StandardServer.java:218

9)
at org.apache.catalina.startup.Catalina.start(Catalina.java:512)
at org.apache.catalina.startup.Catalina.execute(Catalina.java:400)
at org.apache.catalina.startup.Catalina.process(Catalina.java:180)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at

sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.

java:39)
at

sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces

sorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:203)

The only thing I can think of is that the context-param isn't

accessable

until after the context constructor is finished. Which makes it not
very helpfull for me.

If anyone has another way of doing this without putting it into a
properties file I'm interested.

(The whole point of this is we're trying to migrate our properties to

DB

tables and need to give the app the DB user and password)

Thanks


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