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Closed database: NullPointerException instead of 'database is closed'

I see the following NullPointerException (copied from rcl.trace.db): 02-23 13:55:30 jdbc[5]: SQLException org.h2.jdbc.JdbcSQLException: Allgemeiner Fehler: "java.lang ...
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NullPointer exception when trying to access method local variable inside streaming query

function testSelectQuery() { int simpleVar = 80; forever { from inputStream select simpleVar as simVar => (TeacherOutput[] teachers) { foreach var t in teachers { outputStream.publish(t); } } } } When ...