MissingVariableException prevents StreamBase fragment startup
Article ID: KB0081200
Updated On:
| Products | Versions |
|---|---|
| TIBCO Streaming | 10 |
Description
The TIBCO StreamBase® server fails to start and shows error:
error (fragment deploy): app.cluster - 2018-04-16 13:55:56.632000-0400 [14148:EventFlow Fragment] ERROR com.tibco.ep.sb.rt.launcher.EventFlowFragment: java.lang.Exception: Fragment package_and_name terminated with status [-1,number,#####}]: Aborting transaction default:
java.lang.RuntimeException:
java.lang.ClassCastException:
com.streambase.sb.expr.ExprContext$MissingVariableException cannot be cast to java.lang.String:
Issue/Introduction
How to resolve the MissingVariableException in SB configuration
Resolution
This is a problem with quote handling when defining named values in HOCON configuration. String values may need to be double-quoted (using both double-quotes and single quotes together) in the configuration due to usage context.
For example, this is correct for supplying a substitution value as part of a string constant:
This will raise the above error (missing interior single quotes):
For example, this is correct for supplying a substitution value as part of a string constant:
streamBase = {
constantsOverwrite = {
"NAMECON" = "'prefix-${NAMESUB:-VALUE_FROM_CONF}-suffix'"
}
}
This will raise the above error (missing interior single quotes):
streamBase = {
constantsOverwrite = {
"NAMECON" = "prefix-${NAMESUB:-VALUE_FROM_CONF}-suffix"
}
}
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