[rules-users] Why are indented keywords in template causing NPE or DecisionTableParseException?

[magnusv]

Drools 5.5.0

Indenting the "template header" or "rule" keywords in a template file will
cause exceptions on expansion. I believe it might be related to this old
JIRA issue: https://issues.jboss.org/browse/JBRULES-2786

"DecisionTableParseException" and "NullPointerException" are thrown. See
example code and related stack traces below.


Is this a bug in drools or is the template formatting intended to be this
strict? Or am I doing something else wrong?


=====================
Indented template header:
"    template header
age
type
log"

Gives the exception:
org.drools.template.parser.DecisionTableParseException: Missing header
at
org.drools.template.parser.DefaultTemplateContainer.parseTemplate(DefaultTemplateContainer.java:87)
at
org.drools.template.parser.DefaultTemplateContainer.<init>(DefaultTemplateContainer.java:47)
at
org.drools.decisiontable.ExternalSpreadsheetCompiler.compile(ExternalSpreadsheetCompiler.java:97)

=====================
Indented rule keyword:

"     rule "Cheese fans_@{row.rowNumber}"
when
   Person(age == @{age})"

Gives the exception:
java.lang.NullPointerException
at
org.drools.template.parser.DefaultTemplateColumn.createCellCondition(DefaultTemplateColumn.java:67)
at
org.drools.template.parser.DefaultTemplateColumn.addCondition(DefaultTemplateColumn.java:90)
at
org.drools.template.parser.DefaultTemplateRuleBase.createColumnConditions(DefaultTemplateRuleBase.java:103)
at
org.drools.template.parser.DefaultTemplateRuleBase.createTemplateRule(DefaultTemplateRuleBase.java:96)
at
org.drools.template.parser.DefaultTemplateRuleBase.getDTRules(DefaultTemplateRuleBase.java:83)
at
org.drools.template.parser.DefaultTemplateRuleBase.<init>(DefaultTemplateRuleBase.java:62)
at
org.drools.template.parser.TemplateDataListener.<init>(TemplateDataListener.java:74)
at
org.drools.decisiontable.ExternalSpreadsheetCompiler.compile(ExternalSpreadsheetCompiler.java:99)




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