Exception handling onException() using Apache Camel - exception

Question

I am trying to handle Exception in my code. Below is the code:
public void configure() throws Exception {
onException(Exception.class).process(new Processor() {
public void process(Exchange exchange) throws Exception {
System.out.println("handling ex");
}
}).log("Received body").handled(true).end();
from("file:src/main/resources?fileName=data.csv")
.process(new MyTransformRevised1())
.to("file:src/main/resources/?fileName=emp.xml")
.split(body().tokenizeXML("equityFeeds", null)).streaming().to("jms:queue:xml.inbound.topic");
}
Now if suppose in the line: from("file:src/main/resources?fileName=data.csv") if the file "data.csv" is not present in my resources folders then shouldn't it throw FileNotFoundException and go into the onException() handler and print "handling ex"? Also when this code runs my log statement is also not printed to the console.
Currently its not going into the onException() handler. I am failing to understand as to why? Please kindly help me solve this issue.

Answer 1

As #bedla already commented, you will not get a FileNotFoundException because `from("file:...") creates a file consumer that is listening continuously for new files in the directory you configure.
The filename option acts as a filter. That means your file consumer processes only files with the name data.csv.
So if you drop a file with this name, it will be consumed and moved to a subfolder (I think the default name is .camel). Then you can drop another data.csv into the folder and it will be consumed too. If you remove the filename option, it consumes every file you drop into the folder.
If you don't want to have a continuous file import from a folder, but want to import a specific file as part of your processing workflow, have a look at Camel Poll Enrich EIP. There is a simple example that imports a file.