NichaRoj opened a new issue, #25755:
URL: https://github.com/apache/beam/issues/25755

   ### What happened?
   
   I tried searching for previous reports and didn't find anything.
   
   Currently writing custom Dataflow templates to write to BigQuery using Java 
SDK.
   
   ```
   <beam.version>2.45.0</beam.version>
   <bigquery.version>v2-rev20200719-1.30.10</bigquery.version>
   <google-api-client.version>1.30.10</google-api-client.version>
   <google-http-client.version>1.34.0</google-http-client.version>
   ```
   
   I am trying to run pipeline with `BigQueryIO.writeTableRows()` with schema 
specified, but mode not specified so it should be `NULLABLE`
   
   However, if `TableRow` from previous stage does not contain field, it gives 
error:
   ```
   Error while reading data, error message: JSON parsing error in row starting 
at position 16645: No such field: user_address.
   ```
   In temp file, the relevant object does not have the field shown in error.
   
   In another instance, `TableRow` from previous stage contains the field, but 
the field is an empty string. It gives error:
   ```
   Error while reading data, error message: JSON parsing error in row starting 
at position 0: No such field: user_address.
   ```
   
   
   ### Issue Priority
   
   Priority: 2 (default / most bugs should be filed as P2)
   
   ### Issue Components
   
   - [ ] Component: Python SDK
   - [X] Component: Java SDK
   - [ ] Component: Go SDK
   - [ ] Component: Typescript SDK
   - [X] Component: IO connector
   - [ ] Component: Beam examples
   - [ ] Component: Beam playground
   - [ ] Component: Beam katas
   - [ ] Component: Website
   - [ ] Component: Spark Runner
   - [ ] Component: Flink Runner
   - [ ] Component: Samza Runner
   - [ ] Component: Twister2 Runner
   - [ ] Component: Hazelcast Jet Runner
   - [ ] Component: Google Cloud Dataflow Runner


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