Error in Migrated Parser

rcdev58

I'm new to CongoCC and migrating a JavaCC-generated expression parser, sqlexpr-javacc, to a CongoCC-generated parser, sqlexpr-congocc. The language is a subset of SQL WHERE clause expressions.

I migrated the Javacc SqlExprParser.jj definition to the CongoCC SqlExprParser.ccc definition. When I run the goodFilters() unit test in ParserTest.java, I get the following error.

FAILED: net.magneticpotato.sqlexpr.congocc.parser.ParserTest.goodFilters
jakarta.jms.InvalidSelectorException: name = 'Bud' AND tenant_id = 'iplantc.org'
	at net.magneticpotato.sqlexpr.congocc.parser.SqlExprParser.parse(SqlExprParser.java:91)
	at net.magneticpotato.sqlexpr.congocc.parser.SqlExprParser.parse(SqlExprParser.java:63)
	at net.magneticpotato.sqlexpr.congocc.parser.ParserTest.goodFilters(ParserTest.java:26)
        ...
Caused by: java.lang.NullPointerException: Cannot invoke "net.magneticpotato.sqlexpr.congocc.parser.Token.getTokenSource()" because "this.lastConsumedToken" is null
	at net.magneticpotato.sqlexpr.congocc.parser.SqlExprParser.openNodeScope(SqlExprParser.java:3556)
	at net.magneticpotato.sqlexpr.congocc.parser.SqlExprParser.JmsSelector(SqlExprParser.java:289)
	at net.magneticpotato.sqlexpr.congocc.parser.SqlExprParser.parse(SqlExprParser.java:89)

The test code is the same as in the JavaCC-generated parser and it works there. Before I go down a rabbit hole, is this a familiar error that has an simple fix? Thanks!

rcdev58

I'm not seeing much activity on the discussion forum. Is CongoCC still active?

vsajip

rcdev58 Is CongoCC still active?

Yes, but it's a small team and we have other projects on the go! Someone should be able to look at this soon. It's generally been uncommon to run into an NPE. If you can shrink it to a small example, feel free to add a bug report.