Java must be installed on this system to use this when using dataflow flex template python

I’m using SQL transform of apache_beam python and deploy to Dataflow by Flex Template. The pipeline show the error: Java must be installed on this system to use. I know the SQL transform of beam python using Java, I researched the way to add Java to pipeline but all failed. Can you give any advice on how to fix this error? Thank a lot.

Answer

You need to have either Java8 or Java11 installed locally to start a Java expansion service to expand your SqlTransforms into Java SDK transforms. This is pipeline construction different from later pipeline execution and could be where your issue occurred.