groovy "MissingMethodException" RESTAPI call

Question

I am trying to access data from RESTAPI using groovy code where i am getting error as below:

groovy.lang.MissingMethodException: No signature of method: java.lang.String.call() is applicable for argument types: () values: []
Possible solutions: wait(), chars(), any(), wait(long), take(int), tap(groovy.lang.Closure)
    at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.unwrap(ScriptBytecodeAdapter.java:70)
    at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeMethodN(ScriptBytecodeAdapter.java:182)
    at org.codehaus.groovy.runtime.ScriptBytecodeAdapter.invokeClosure(ScriptBytecodeAdapter.java:586)

The error is coming mostly on the below part of the lines from code :

    String requestString = getRequestStringPrefix() + sb.toString()
    readHistory(authToken,ricMap,outFile)
    writeInstFile(outFile)

I am really new in the groovy coding and not understanding exactly the cause of the issue and how to resolve this issue in the code.

Answer 1

With this getRequestStringPrefix() you are calling a method with that name or as a shortcut a method call() on the underlying object, then it looks like getRequestStringPrefix.call().

I'm not sure what your intention was, but the line:

String requestString = getRequestStringPrefix() + sb.toString()

should look like

String requestString = getRequestStringPrefix + sb.toString()

because the variable getRequestStringPrefix (a strange name for a var) is defined as String further down:

String getRequestStringPrefix = """{
  "ExtractionRequest": {..."""