[CAMEL-20866] SEDA with exchangepattern InOnly gives sometimes multiple responses

• Type: Bug
• Status: Resolved
• Priority: Minor
• Resolution: Fixed
• Affects Version/s: 4.6.0
• Fix Version/s: 4.7.0
• Component/s: camel-seda
• Estimated Complexity: Unknown
• Assignee: Claus Ibsen
• Reporter: Raymond
• Created: 12/Jun/24 06:32
• Updated: 11/Jul/24 07:26
• Resolved: 13/Jun/24 09:02

Description

I have Camel 4.6 running on Java 21

When I use the following curl:

curl -X POST --header "Content-Type: text/plain" --data 'x' http://localhost:9001/test

To test the following route:

<routes id="camel" xmlns="http://camel.apache.org/schema/spring">
    <route id="1">
        <from uri="jetty:http://0.0.0.0:9001/test"/>
        <to uri="seda:2?exchangePattern=InOut"/>
    </route>
    <route id="2">
        <from uri="seda:2"/>
        <setBody>
            <constant>Y</constant>
        </setBody>
    </route>
</routes>

This works as expected and the result is Y.

Now I changed the exchangepattern from 'InOut' to 'InOnly':

<routes id="camel" xmlns="http://camel.apache.org/schema/spring">
    <route id="1">
        <from uri="jetty:http://0.0.0.0:9001/test"/>
        <to uri="seda:2?exchangePattern=InOnly"/>
    </route>
    <route id="2">
        <from uri="seda:2"/>
        <setBody>
            <constant>Y</constant>
        </setBody>
    </route>
</routes>

When I call this flow with curl multiple times, I sometimes get the result:

X

And the other time:

XX

So the result is returned twice or even more times. I would expect only to get the output X (which for example works this way when I use ActiveMQ).

It may take more than 10 times before you can see the double responses, but this behavior can be easier reproduced by adding more SEDA endpoints:

<routes id="camel" xmlns="http://camel.apache.org/schema/spring"> <route id="1"> <from uri="jetty:http://0.0.0.0:9001/test"/> <to uri="seda:2?exchangePattern=InOnly"/> </route> <route id="2"> <from uri="seda:2"/> <to uri="seda:3"/> </route> <route id="3"> <from uri="seda:3"/> <to uri="seda:4"/> </route> <route id="4"> <from uri="seda:4"/> <to uri="seda:5"/> </route> <route id="5"> <from uri="seda:5"/> <setBody> <constant>Y</constant> </setBody> </route></routes>

Issue Links

• is related to: CAMEL-20965 InputStreamCache is not thread-safe