CODEWITHSUNDEEP
javagroovygroovyshell
navi27
navi27

Reputation: 23

How to add LinkedHashMap elements to a list and use groupBy method in Groovy

I want to post three different version of my codes, out of which one working but I cannot go with that approach.

Version1: not working

List<LinkedHashMap> listOfRecords 
LinkedHashMap a = [product: 'p1', cluster: 'c1', salesorg: 's1']
LinkedHashMap b = [product: 'p2', cluster: 'c2', salesorg: 's2']
LinkedHashMap c = [product: 'p2', cluster: 'c3', salesorg: 's2']

listOfRecords.add(a)
listOfRecords.add(b)
listOfRecords.add(c)

println("listOfRecords : "+listOfRecords)
println("listOfRecords groupby : "+listOfRecords.groupBy { it.cluster })

Script failed on line: 6, with error: An error occurred while processing this page.

Version2 : working, but I don't want to assign LinkedHashMap to list during the declaration.

LinkedHashMap a = [product: 'p1', cluster: 'c1', salesorg: 's1']
LinkedHashMap b = [product: 'p2', cluster: 'c2', salesorg: 's2']
LinkedHashMap c = [product: 'p2', cluster: 'c3', salesorg: 's2']

List listOfRecords=[a]
//listOfRecords.add(a)
listOfRecords.add(b)
listOfRecords.add(c)

println("listOfRecords : "+listOfRecords)
println("listOfRecords groupby : "+listOfRecords.groupBy { it.cluster })

Version3: not working. Since it has a validation error, I tried with version1 and version2

//List<LinkedHashMap> listOfRecords 
LinkedHashMap a = [product: 'p1', cluster: 'c1', salesorg: 's1']
LinkedHashMap b = [product: 'p2', cluster: 'c2', salesorg: 's2']
LinkedHashMap c = [product: 'p2', cluster: 'c3', salesorg: 's2']

List listOfRecords;
//List listOfRecords=[a]
listOfRecords.add(a)
listOfRecords.add(b)
listOfRecords.add(c)

println("listOfRecords : "+listOfRecords)
println("listOfRecords groupby : "+listOfRecords.groupBy { it.cluster })

A validation error was received from the Planning server. 'Error:The Groovy script failed to compile with internal error: Compile Error: [Static type checking] - No such property: cluster for class: java.lang.Object @ line 13, column 60. Rule SalesPLN.SALESREP.linkedhashmap'

Thanks in advance.

Upvotes: 0

Views: 2285

Answers (1)

cfrick
cfrick

Reputation: 37033

Running your original script gives an Null Pointer Exception, because you never initialize listOfRecords (E.g. this should fix it: def listOfRecords = []). The code tries to add to listOfRecords, which triggers the NPE. Your second example does initialize your var and therefor works.

Why you get such a useless error message is beyond me though.

Upvotes: 1

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