Hi, recently we stumbled across a problem using camel’s “toD” (To-Dynamic) processor in combination with file and https endpoints. Sometimes the component-part of the uri seems to get doubled (e.g. file://file://) which leads to writing the files to the wrong directory (below file:/). We experienced the same issue with toD in combination with https which led to https://https:// and therefore to UnknownHostExceptions.
We think this has to do with the optimization (allowOptimizedComponents) that
is done by Camel.
As workaround we switched from “toD” to “to” and using the component-specific
exchange headers to implement the same behaviour as with “toD”. We know that
“toD” optimization can also be disabled, but we think that there is a bug
(maybe somewhere in the SendDynamicAware classes for file and http component)
and have a bad feeling right now using it.
Unfortunately, the issue (especially for file) was not really reproducible and
it only happened in one out of three instances of the running service.
Here is some output of the FileProducer when the problem happened (you can see
the wrongly prepended file:/ on the written file):
{"service":"sampleService","timestamp":"2021-10-05T11:42:45.998+02:00","logger":"org.apache.camel.component.file.GenericFileProducer","level":"DEBUG","thread":"Camel
(sampleService) thread #13 - JmsConsumer[foo.bar]","msg":"Wrote
[file:/tmp/xyz/foo.xml] to
[file://file:///tmp/xyz?fileExist=Fail&fileName=%24%7BexchangeProperty.fileLocation.fileName%7D]"}
We found a JIRA-Ticket which seems to be related to the problem
(https://issues.apache.org/jira/browse/CAMEL-16216) for http-component.
With this simple route you can see that toD optimization seems to wrongly
extract the “host” part and doubles the http component-part when doing
optimization:
from(timer("foo").repeatCount(1).delay(1000)).id("sample")
.setHeader("timeout", constant(1000))
.toD("http:test.dyn?socketTimeout=${header.timeout}");
[mel-1) thread #0 - timer://foo] SendDynamicProcessor DEBUG
Optimising toD via SendDynamicAware component: http to use static uri:
http:http:test.dyn
We used Camel version 3.11.1 in combination with spring-boot 2.5.3.
Has someone experienced similar issues and could some of the camel developers
look into this potential bug?
Thanks,
Nico
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