Unable to set threadPool rejectedPolicy element via property

Solution In Progress - Updated -

Environment

  • Fuse ESB 7.1

Issue

We are trying to use the threadPool blueprint DSL but are hitting a problem with trying to use a property value for the rejectedPolicy:

<threadPool id="uploadWmsFtpThreadPool" poolSize="{{uploadWmsFtpThreadPool.poolSize}}" threadName="Upload Wms Ftp Thread processor" maxQueueSize="{{uploadWmsFtpThreadPool.maxQueueSize}}" rejectedPolicy="{{uploadWmsFtpThreadPool.rejectedPolicy}}" />

and the following error is in the logs:

Caused by: org.xml.sax.SAXParseException: cvc-enumeration-valid: Value '{{uploadWmsFtpThreadPool.rejectedPolicy}}' is not facet-valid with respect to enumeration '[Abort, CallerRuns, DiscardOldest, Discard]'. It must be a value from the enumeration.
        at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)[:]
        at org.apache.xerces.util.ErrorHandlerWrapper.error(Unknown Source)[:]
        at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)[:]
        at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)[:]
        at org.apache.xerces.impl.XMLErrorReporter.reportError(Unknown Source)[:]
        at org.apache.xerces.impl.xs.XMLSchemaValidator$XSIErrorReporter.reportError(Unknown Source)[:]
        at org.apache.xerces.impl.xs.XMLSchemaValidator.reportSchemaError(Unknown Source)[:]
        at org.apache.xerces.impl.xs.XMLSchemaValidator.processOneAttribute(Unknown Source)[:]
        at org.apache.xerces.impl.xs.XMLSchemaValidator.processAttributes(Unknown Source)[:]
        at org.apache.xerces.impl.xs.XMLSchemaValidator.handleStartElement(Unknown Source)[:]
        at org.apache.xerces.impl.xs.XMLSchemaValidator.startElement(Unknown Source)[:]
        at org.apache.xerces.jaxp.validation.DOMValidatorHelper.beginNode(Unknown Source)[:]
        at org.apache.xerces.jaxp.validation.DOMValidatorHelper.validate(Unknown Source)[:]
        at org.apache.xerces.jaxp.validation.DOMValidatorHelper.validate(Unknown Source)[:]
        at org.apache.xerces.jaxp.validation.ValidatorImpl.validate(Unknown Source)[:]
        at javax.xml.validation.Validator.validate(Unknown Source)[:2.0.0.fuse-71-047]
        at org.apache.aries.blueprint.parser.Parser.validate(Parser.java:285)[7:org.apache.aries.blueprint.core:1.0.1.fuse-71-047]
        ... 22 more

Resolution

rejectedPolicy element is an enum type and {{}} cannot be supported, we can only support xs:string type for it. However there's a work around it [1] from camel 2.11.1 or 2.10.5 onwards where you can set a dummy value for the option and then add:

prop:rejectedPolicy="{{xxx}}"

to override the value. Not to mention that the namespace:

xmlns:prop="http://camel.apache.org/schema/placeholder"

needs to be added on top of the blueprint DSL.

[1] - see section: Using property placeholders for any kind of attribute in the XML DSL

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