wrapperClass usage

[goober_nut]

I'm trying to define my own wrapper, but I'm running into some issues.
Basically it appears the wrapper never gets called.

What I've done so far is create a very simple servlet which prints hello
to the browser and I've written a wrapper class named MyWrapper which
extends StandardWrapper. The MyWrapper class just has a constructor
which is supposed to print out to the logs "I'm in the wrapper."  Also,
in this project, I edited the context.xml file to read <Context
wrapperClass="MyWrapper.java"/> and started up the Tomcat server.

When I loaded up the hello servlet, I don't see the message "I'm in the
wrapper.", but I do see the page with hello on it.

I've also edited the context.xml file to read <Context
wrapperClass="FakeClass.java"/> to see if I'd see a message anywhere
showing me that it's trying to instantiate the wrapperClass for me but
couldn't. I don't see that either.

Can anyone tell me what I'm doing wrong?

Thanks,
   Brian

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[markt-2]

Brian E. Nicely wrote:
> What I've done so far is create a very simple servlet which prints hello
> to the browser and I've written a wrapper class named MyWrapper which
> extends StandardWrapper. The MyWrapper class just has a constructor
> which is supposed to print out to the logs "I'm in the wrapper."  Also,
> in this project, I edited the context.xml file to read <Context
> wrapperClass="MyWrapper.java"/> and started up the Tomcat server.

That should be wrapperClass="must.include.the.package.MyWrapper"

> Can anyone tell me what I'm doing wrong?

I assume the compiled class has been JAR'd and placed in the
CATALINA_HOME/lib directory.

Mark


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[goober_nut]

>> What I've done so far is create a very simple servlet which prints hello
>> to the browser and I've written a wrapper class named MyWrapper which
>> extends StandardWrapper. The MyWrapper class just has a constructor
>> which is supposed to print out to the logs "I'm in the wrapper."  Also,
>> in this project, I edited the context.xml file to read <Context
>> wrapperClass="MyWrapper.java"/> and started up the Tomcat server.

>That should be wrapperClass="must.include.the.package.MyWrapper"

Yes, I'm sorry, I did put my package name in there so it does look like wrapperClass="my.class.MyWrapper".
It does read though "my.class.MyWrapper.java", does that make a difference?

>> Can anyone tell me what I'm doing wrong?

>I assume the compiled class has been JAR'd and placed in the
>CATALINA_HOME/lib directory.

I don't have a $CATALINA_HOME/lib, I do have $CATALINA_HOME/common/lib, is that where it's supposed to go?

I did jar my MyWrapper's whole package up and put it in the /common/lib folder and restarted Tomcat. I tried it with both MyWrapper.java and MyWrapper and neither of them are printing for me.

>Mark

[Christopher Schultz-2]

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Brian,

goober_nut wrote:
| Yes, I'm sorry, I did put my package name in there so it does look like
| wrapperClass="my.class.MyWrapper".
| It does read though "my.class.MyWrapper.java", does that make a
difference?

Yes, the class name does not include ".java" -- you should remove it.

|>> Can anyone tell me what I'm doing wrong?
|
|> I assume the compiled class has been JAR'd and placed in the
|> CATALINA_HOME/lib directory.
|
| I don't have a $CATALINA_HOME/lib, I do have $CATALINA_HOME/common/lib, is
| that where it's supposed to go?

You never said which version of TC you are using. For TC 6, it should go
in lib... for TC 5.5 it should go in shared/lib or server/lib. I
recommend the latter.

| I did jar my MyWrapper's whole package up and put it in the /common/lib
| folder and restarted Tomcat. I tried it with both MyWrapper.java and
| MyWrapper and neither of them are printing for me.

You probably have your JAR in the wrong place.

- -chris
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[goober_nut]

| Yes, I'm sorry, I did put my package name in there so it does look like
| wrapperClass="my.class.MyWrapper".
| It does read though "my.class.MyWrapper.java", does that make a
difference?

Yes, the class name does not include ".java" -- you should remove it.

|>> Can anyone tell me what I'm doing wrong?
|
|> I assume the compiled class has been JAR'd and placed in the
|> CATALINA_HOME/lib directory.
|
| I don't have a $CATALINA_HOME/lib, I do have $CATALINA_HOME/common/lib, is
| that where it's supposed to go?

You never said which version of TC you are using. For TC 6, it should go
in lib... for TC 5.5 it should go in shared/lib or server/lib. I
recommend the latter.

| I did jar my MyWrapper's whole package up and put it in the /common/lib
| folder and restarted Tomcat. I tried it with both MyWrapper.java and
| MyWrapper and neither of them are printing for me.

You probably have your JAR in the wrong place.

Chris and Mark,

    Thank you both for your help. It's working now. I do have one more question now though since I got that to work.

    Is it possible to package up your own wrapper inside a war file which you can deploy to other Tomcat servers without putting it in Tomcat 5.5 - shared/lib or server/lib or Tomcat 6 lib/?

-Brian

[Christopher Schultz-2]

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Brian,

goober_nut wrote:
| Is it possible to package up your own wrapper inside a war file which
| you can deploy to other Tomcat servers without putting it in Tomcat 5.5 -
| shared/lib or server/lib or Tomcat 6 lib/?

That depends on exactly which ClassLoader Tomcat uses to instantiate
your wrapper class. Given that placing your JAR in common/lib did not
work, I would imagine that putting it into your WAR file wouldn't work,
either.

Sorry, you're going to have to install your JAR file into any Tomcat
server where you want to use this wrapper.

- -chris

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[Juha Laiho]

goober_nut wrote:
>     Is it possible to package up your own wrapper inside a war file which
> you can deploy to other Tomcat servers without putting it in Tomcat 5.5 -
> shared/lib or server/lib or Tomcat 6 lib/?

Not for deployment as a war file; I'm pretty certain that the class is not
being searched for in the webapp classpath, but in the system classpath
(however the claim that it does get loaded from shared/lib but not from
common/lib does contradict this).

What you could do is to declare a new directory in catalina.properties server
classpath for holding your own extensions to Tomcat. Whether this helps of
just makes the mess worse depends a lot on your situation.
--
..Juha

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