camel expression - simple expression with header value as an argument

Question

I am trying to set camel Header value using below Expression

 .setHeader("amqName").simple("${amqAddressMap.get(header.userTypeID)}", String.class)

where amqAddressMap is an array list and passing header value as argument but it shows invalid expression error

is there any way to execute the code without using using processor class

Hi! I think you need to have ${amqAddressMap.get(${header.userTypeID})} — Screwtape
– Screwtape, Commented Jul 9, 2019 at 16:39
@Screwtape is correct. Also how is amqAddressMap declared? My blind guess is it is your local java variable and you cannot do that, you can only access objects stored in Exchange. Use setProperty("amqAddressMap", constant(amqAddressMap)) and then you can refer it with ${exchangeProperty.amqAddressMap.get(${header.userTypeID})}. And I am pretty sure that the exception message tells a bit more, than "invalid expression error" — Bedla
– Bedla, Commented Jul 9, 2019 at 21:42
@Screwtape Setting property fixed the issue. Thanks. Can you make it as an answer. — nidhin
– nidhin, Commented Jul 10, 2019 at 10:35

nidhin · Accepted Answer · 2019-07-12 04:33:21Z

1

To access ArrayList inside exchange we need to set it as a property

setProperty("amqAddressMap", constant(amqAddressMap))

So that we can access it using EL like

${exchangeProperty.amqAddressMap.get(${header.userTypeID})}

answered Jul 12, 2019 at 4:33

nidhin

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