[jira] [Created] (FLINK-15992) Incorrect classloader when finding TableFactory

["Victor Wong (Jira)" <ji...@apache.org>]

Victor Wong created FLINK-15992:
-----------------------------------

             Summary: Incorrect classloader when finding TableFactory
                 Key: FLINK-15992
                 URL: https://issues.apache.org/jira/browse/FLINK-15992
             Project: Flink
          Issue Type: Bug
          Components: Connectors / Kafka
            Reporter: Victor Wong


*Background*

As a streaming service maintainer in our company, to ensure our users depend on the correct version of Kafka and flink-kafka, we add "flink-connector-kafka" into "fink-dist/lib" directory.

*Problem*

When submitting flink-sql jobs, we encountered below exceptions:
{code:java}
Caused by: org.apache.flink.table.api.NoMatchingTableFactoryException: Could not find a suitable table factory for 'org.apache.flink.table.factories.DeserializationSchemaFactory' in
the classpath.
{code}

*Debug*

We find that it was caused by this:

{code:java}
// org.apache.flink.streaming.connectors.kafka.KafkaTableSourceSinkFactoryBase#getSerializationSchema

		final SerializationSchemaFactory<Row> formatFactory = TableFactoryService.find(
			SerializationSchemaFactory.class,
			properties,
			this.getClass().getClassLoader());
{code}

It uses `this.getClass().getClassLoader()`, which will be BootStrapClassLoader of fink.
We could replace it with `Thread.currentThread().getContextClassLoader()` to solve this.

There is a related issue: https://issues.apache.org/jira/browse/FLINK-15552





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