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https://issues.apache.org/jira/browse/MINIFICPP-2375?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ferenc Gerlits resolved MINIFICPP-2375.
---------------------------------------
Resolution: Fixed
> ExecuteScript with lua throws if there is no onTrigger function
> ---------------------------------------------------------------
>
> Key: MINIFICPP-2375
> URL: https://issues.apache.org/jira/browse/MINIFICPP-2375
> Project: Apache NiFi MiNiFi C++
> Issue Type: Improvement
> Reporter: Ferenc Gerlits
> Assignee: Ferenc Gerlits
> Priority: Minor
> Time Spent: 20m
> Remaining Estimate: 0h
>
> When running ExecuteScript with
> {noformat}
> Properties:
> Script Engine: lua
> Script Body: print("hello world!") {noformat}
> onTrigger throws an exception, and the flow file gets penalized, although the
> script gets called: "hello world!" is printed to the console. The log file
> has
> {noformat}
> [2024-05-15 15:11:29.108] [org::apache::nifi::minifi::core::Processor]
> [warning] Caught "attempt to call a nil value
> stack traceback:"
> (N3org6apache4nifi6minifi10extensions3lua18LuaScriptExceptionE) during
> Processor::onTrigger of processor: 2cc9c0d6-6ea2-473e-a30d-5debb0b3b2c5
> (Execute script) (2cc9c0d6-6ea2-473e-a30d-5debb0b3b2c5)
> [2024-05-15 15:11:29.108] [org::apache::nifi::minifi::core::ProcessSession]
> [warning] ProcessSession rollback for Execute script executed
> [2024-05-15 15:11:29.108] [org::apache::nifi::minifi::SchedulingAgent]
> [warning] Caught Exception during SchedulingAgent::onTrigger of processor
> Execute script (uuid: 2cc9c0d6-6ea2-473e-a30d-5debb0b3b2c5), type:
> N3org6apache4nifi6minifi10extensions3lua18LuaScriptExceptionE, what: attempt
> to call a nil value
> stack traceback: {noformat}
> This is because the LuaScriptEngine requires the {{onTrigger}} function. The
> PythonScriptEngine also supports the use case of a simple script without an
> {{onTrigger}} function; in this case, no flow files can be processed or
> produced, but the processor can still be useful if Timer Driven or Cron
> Driven. I think the LuaScriptEngine should support this simple use case, as
> well.
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