[[WhydoesmyfileconsumernotpickupthefileandhowdoIletthefileconsumerusetheCamelerrorhandler-WhydoesmyfileconsumernotpickupthefileandhowdoIletthefileconsumerusetheCamelerrorhandler]]
= Why does my file consumer not pick up the file, and how do I let the file consumer use the Camel error handler?

There could be several reasons why the xref:components::file-component.adoc[File] consumer is
not picking up files. For example it may not run at all, or it cannot
acquire a read lock on the file.
xref:index.adoc#FAQ-LoggingQuestions[Check the logs] for any exceptions or other
informative messages. You can
xref:how-do-i-enable-debug-logging.adoc[turn on DEBUG logging] at
`org.apache.camel.component.file` to see more detail.

[[WhydoesmyfileconsumernotpickupthefileandhowdoIletthefileconsumerusetheCamelerrorhandler-HowtouseCamelsroutingerrorhandlerswiththefileconsumer]]
== How to use Camel's routing error handlers with the file consumer

Well, this is really a
http://en.wikipedia.org/wiki/Chicken_or_the_egg["chicken or the egg"]
question. The Camel xref:ROOT:error-handling-in-camel.adoc[error handler]
(e.g., in the routes) only applies when a message is being routed by the
routing engine.
Before this happens, a consumer must successfully receive a message,
create a Camel xref:ROOT:exchange.adoc[Exchange], populate the
xref:ROOT:exchange.adoc[Exchange] with message details (e.g., body and
headers), and then pass the xref:ROOT:exchange.adoc[Exchange] to the routing
engine. Only at this point can the routing error handler deal with
exceptions occurring. Before this point, any error handling is really
xref:ROOT:component.adoc[component]-specific.

[NOTE]
====
**Bridge with error handler**

From Camel 2.10 onwards the file and ftp consumers can now bridge to the
Camel routing engine's error handler. See more details at the
`bridgeErrorHandler` option on the xref:components::file-component.adoc[File]
documentation.
====

If the component consumer extends the
https://github.com/apache/camel/blob/master/camel-core/src/main/java/org/apache/camel/impl/DefaultConsumer.java[`DefaultConsumer`]
from Camel, then it offers an
https://github.com/apache/camel/blob/master/camel-core/src/main/java/org/apache/camel/spi/ExceptionHandler.java[`org.apache.camel.spi.ExceptionHandler`]
hook for end users to plug-in a custom strategy. The default
implementation from Camel is
https://github.com/apache/camel/blob/master/camel-core/src/main/java/org/apache/camel/impl/LoggingExceptionHandler.java[`LoggingExceptionHandler`]
that will log the exception at `ERROR`/`WARN` level, and then ignore the
exception.

See the xref:components::file-component.adoc[File] page in the bottom for an example how to
use a custom `ExceptionHandler` that sends a new message to the Camel
routing engine, which then allows the routing engine to trigger its own
error handling to deal with the exception.
