[jboss-jira] [JBoss JIRA] (JBRULES-2432) TemplateDataListener.newCell filters out correctly blank values; this leads to incorrect template processing

TemplateDataListener.newCell filters out correctly blank values; this leads to incorrect template processing ------------------------------------------------------------------------------------------------------------ Key: JBRULES-2432 URL: https://issues.jboss.org/browse/JBRULES-2432 Project: Drools Issue Type: Bug Security Level: Public(Everyone can see) Components: drools-core (expert) Affects Versions: 5.0.1.FINAL Environment: Any Reporter: Denis Robert Assignee: Michael Anstis Fix For: 5.4.0.Beta1 When using a DataProviderCompiler(), a blank column returned by the DataProvider causes an entire line to not be outputted in the result. I tracked this to a line in TemplateDataListener.newCell which explicitly filters out blank cells, even though such cells should be allowed. The template I'm using is: <snip> template header ruleID object field regexp replacement package standardization import [removed].* template std_rule rule "@{ruleID}" dialect "mvel" when $o: @{object}() then $o.@{field} = $o.?@{field}.replaceFirst(&quot;(a){regexp}&quot;, "@{replacement}"); end end template <snip> Whenever "replacement" is blank, the consequent does not get generated.