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From John Dale <>
Subject Re: Initiating httpservletrequest from inside Tomcat / TomEE
Date Mon, 06 May 2019 14:40:40 GMT
If you're wanting to forward control to another servlet deployed in
the same context:

If you are okay going through TCP to facilitate some future or current
distribution of services, Use HTTPURLConnection (not sure what you're
wanting to do with the result of the request, if anything):

If you need more sophisticated HTTP interactions, Apache maintains a
very useful library for that:

If these don't work-out for you, rather than using .NET, PHP, Python,
or some other Java facsimile at best, I recommend using the semaphore



On 5/6/19, Paul Carter-Brown <> wrote:
> Hi John,
> Thanks for your feedback.
> The request I'm initiating should not or need not carry any context from
> the originating code. There is also no session to worry about as its just
> for rest calls. So basically I have the headers, path and body and need to
> generate a http servlet request and get an http servlet response (or
> similar) back. I have this working by calling into localhost but ideally
> want to skip the trombone out and back in.
> Have you got any basic code examples?
> Paul
> On Tue, Apr 30, 2019 at 5:27 PM John Dale <> wrote:
>> Another thought .. you can do some request dispatching, but without
>> knowing more about the tools you're using, I can't say for sure if
>> this is the direction you'll want to go.
>> On 4/29/19, Paul Carter-Brown <> wrote:
>> > Hi
>> >
>> > I'm trying to design a Kafka consumer and producer that will run inside
>> the
>> > tomcat jvm and pick up messages off a Kafka topic and translate them
>> into a
>> > servlet request and pass it through tomcat and then when the response
>> > is
>> > complete then translate it into a Kafka message and put it onto another
>> > topic as a reply. This way I can reuse our existing jax-rs rest
>> > services
>> > and expose them as an async api over Kafka. The idea is to make the
>> > Kafka
>> > messages similar to http in that they would consist of headers and a
>> body.
>> > The body would be json.
>> >
>> > Now I know this could be done by calling localhost with an http call to
>> > trombone the requests back into tomcat but I'd like to avoid the
>> associated
>> > latency and overhead. Is it possible to call tomcat directly
>> > in-process.
>> > This does not need to be portable to other containers so can be
>> > proprietary.
>> >
>> > I'm using tomcat 8. In fact its tomee 8 but guessed this is more a
>> > tomcat
>> > question than tomee but have sent to both groups just in case.
>> >
>> > Thanks for any insights.
>> >
>> > Paul
>> >

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