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Subject: RE: Need access to classes outside Tomcat for JSPs
Date: Tue, 1 Mar 2005 14:04:56 -0000
Message-ID: <5684A7E6FB10504393A2806C1F4C021005AF8495@orion.qas.com>
Thread-Topic: Need access to classes outside Tomcat for JSPs
Thread-Index: AcUeZjOH+25V3xqHSMSDwcTs6uaR3wAAP/lQ
From: "Allistair Crossley" <Allistair.Crossley@QAS.com>
To: "Tomcat Users List" <tomcat-user@jakarta.apache.org>

Right, a well formed web application is packaged with its dependent classes=
. Tomcat loads classes from either WEB-INF/classes folder or the lib folder=
 in the form of a JAR for your webapp, or other places like common/lib and =
shared/lib. It does not use your system classpath.

The previous poster was absolutely right with his advice. You need to sort =
out your build environment. You can still have 1 source respository, but wh=
en you build (via Ant let's say since it's the most ubiquitous) you direct =
compiled classes into your 2 locations. You could perhaps wrap them in a JA=
R for Tomcat's purposes, it's up to you.

Having the same classes twice is no bad thing - having source twice is.=20

Allistair.

> -----Original Message-----
> From: Dan [mailto:dan@mcenter.com]
> Sent: 01 March 2005 13:55
> To: Tomcat Users List
> Subject: Re: Need access to classes outside Tomcat for JSPs
>=20
>=20
> Do people read anymore?
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> As previously stated in the original post, these classes need to be=20
> available to other non-web, non TomCat applications.  I do=20
> not want to have=20
> to maintain two different repositories.  Also as previously=20
> stated I have=20
> the desired configuration running on another box but I cannot=20
> duplicate the=20
> setup on this box.
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> If your only advice is to move them into TomCat, then please=20
> don't even=20
> bother replying.
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> At 08:21 AM 3/1/2005, David wrote:
> >Why do you want your classes outside of Tomcat?  Copy the=20
> classes to your=20
> >project when you build and eliminate the dependency.  Or=20
> better yet, use a=20
> >build environment like Ant to do the copying for you.  As a=20
> bonus, it'll=20
> >catch errors before you get to production and the webapp=20
> will be more portable.
> >
> >--David
> >
> >Dan wrote:
> >
> >>Classpath problem.  Really frustrating.
> >>
> >>I'm trying to duplicate a setup on system A to system B and=20
> can't get it=20
> >>working.  My problem is when I access the JSP page, Tomcat=20
> complains of a=20
> >>ClassNotFound exception.  This happens with all of my=20
> custom classes.  If=20
> >>I create a simple JSP page with no custom classes the JSP=20
> compiles fine.
> >>
> >>When I manually execute the class via "java=20
> com.xxx.MyClass" it responds=20
> >>appropriately (my environment's CLASSPATH includes the=20
> custom library paths).
> >>
> >>My custom classes live outside of the Tomcat directory (see below)=20
> >>because I use these classes in other non-web based=20
> applications, so they=20
> >>need to be available system wide.
> >>
> >>I have melted my brain today trying to figure out why=20
> system A works with=20
> >>this configuration but system B gives me the ClassNotFound=20
> exception.   I=20
> >>have even copied my entire Tomcat directory from system A=20
> to system B=20
> >>with no change.  I thought perhaps I was starting the service with=20
> >>additional parameters but I don't see any in the registry settings.
> >>
> >>
> >>Does anyone have an educated guess as to why I can't get=20
> this thing to=20
> >>work the way it's working on the other system and/or how I=20
> can get this=20
> >>working with my custom classes OUTSIDE of Tomcat.
> >>
> >>
> >>
> >>Win2K SP4
> >>Tomcat v5.0.27 as NT Service
> >>
> >>e:\java\tomcat
> >>e:\java\sdk     (JDK 1.4.2)
> >>e:\java\library\custom\      (custom libraries)
> >>e:\java\library\basic       (libraries from other sources)
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>=20
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>=20


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