How Do You Troubleshoot “Caught: java.lang.ArrayStoreException: org.codehaus.groovy.runtime.GStringImpl” when running a Groovy Program?

Problem scenario
You are running a Groovy program. 

Here is your code:

def input = System.console().readLine 'Please provide some input: '
def x = input
def boardArray = new String[2]
boardArray[0] = ""
boardArray[1] = ""
boardArray[1] = "$x"
println boardArray[1]

When you run it (i.e., with groovy foobar.groovy), you get this error:

"Caught: java.lang.ArrayStoreException: org.codehaus.groovy.runtime.GStringImpl
java.lang.ArrayStoreException: org.codehaus.groovy.runtime.GStringImpl"

What should you do?

Solution
To assign an element of an array, should have quotes around the variable and the $ symbol and the syntax " as String" should follow the closing quote mark.

def input = System.console().readLine 'Please provide some input: '
def x = input
def boardArray = new String[2]
boardArray[0] = ""
boardArray[1] = ""
boardArray[1] = "$x" as String   //This is the correct version
println boardArray[1]

You may also want to view this external web pages:
https://stackoverflow.com/questions/44192690/set-array-to-variable-in-groovy
http://docs.groovy-lang.org/latest/html/api/org/codehaus/groovy/runtime/GStringImpl.html

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