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'; How get the value of ValueProvider parameter for add a RowFilter in with Java and Apache Beam - LavOzs.Com

I am trying to build a rowFilter using the object rowKeyRegexFilter. How do i get the string value for the ValueProvider parameter to build the rowKeyRegexFilter?

I modified a Dataflow template to copy data from Bigtable to Avro (Java and Apache Beam), i added a RowFilter to the using a rowKeyRegexFilter, i need the regex to be a runtime parameter.

BigtableIO.Read read =

But I can't get the value and it shows me the following error:

java.lang.IllegalStateException: Value only available at runtime, but accessed from a non-runtime context: RuntimeValueProvider{propertyName=regex, default=null}

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