properties - Using Spring Expression Language to define xml attribute -


here problem: have read property (activemq.connector.port) , add 2 , use set attribute (connectorport) on bean managementcontext. here property comes file or system property. spring not care suppose. 

 <amq:broker id="broker" usejmx="true" persistent="true">        <amq:managementcontext createconnector="true" connectorport="#{${activemq.connector.port}+2}"/>        <amq:transportconnectors>            <amq:transportconnector uri="vm://localhost:${activemq.connector.port:1099}"/>        </amq:transportconnectors>  </amq:broker>

when tried got exception.

caused by: org.springframework.beans.factory.nosuchbeandefinitionexception: no bean named '{1099 + 2 }' defined     @ org.springframework.beans.factory.support.defaultlistablebeanfactory.getbeandefinition(defaultlistablebeanfactory.java:568)     @ org.springframework.beans.factory.support.abstractbeanfactory.getmergedlocalbeandefinition(abstractbeanfactory.java:1108)     @ org.springframework.beans.factory.support.abstractbeanfactory.dogetbean(abstractbeanfactory.java:278)     @ org.springframework.beans.factory.support.abstractbeanfactory.getbean(abstractbeanfactory.java:194)     @ org.springframework.beans.factory.support.beandefinitionvalueresolver.resolvereference(beandefinitionvalueresolver.java:323)

how make work? there alternative approaches achieve this?

before try: "#{2 + ${activemq.connector .port}}" force spel use placeholder numbers.

else use syntax (is spel notation java code integer.valueof(value of 'activemq.connector.port') + 2):

#{ t(java.lang.integer).valueof('${activemq.connector.port}') + 2 }

probably ${} managed string , not number "cast" needed t(class).<staticmethod>(params) spel syntax call static method


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