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Calling a web service from Groovy script

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Summary:

Dear All,

I'm trying to call web service from the default value option in the DFF, but I'm facing an error while saving the DFF.

Also

, I'm facing the same error while I'm calling the web service in the (configure business object ) in the validation function.

below are the screenshots for all places and error

JBO-29000: Unexpected exception caught: java.lang.NullPointerException, msg=Cannot invoke method POST() on null object RootCause Exception message : Cannot invoke method POST() on null object Call Stack: org.codehaus.groovy.runtime.NullObject.invokeMethod(NullObject.java:91) org.codehaus.groovy.runtime.callsite.PogoMetaClassSite.call(PogoMetaClassSite.java:43)  

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