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https://issues.apache.org/jira/browse/FLINK-15552?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17016868#comment-17016868
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Timo Walther commented on FLINK-15552:
--------------------------------------
Whenever we run the optimizer we need to make sure that we set the context
class loader. There is a {{wrapClassloader}} utility for doing this.
{{findAndCreateTableSource}} might also has a method for setting the
classloader explicitly.
> SQL Client can not correctly create kafka table using --library to indicate a
> kafka connector directory
> -------------------------------------------------------------------------------------------------------
>
> Key: FLINK-15552
> URL: https://issues.apache.org/jira/browse/FLINK-15552
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Client, Table SQL / Runtime
> Reporter: Terry Wang
> Assignee: Leonard Xu
> Priority: Critical
> Fix For: 1.10.0
>
>
> How to Reproduce:
> first, I start a sql client and using `-l` to point to a kafka connector
> directory.
> `
> bin/sql-client.sh embedded -l /xx/connectors/kafka/
> `
> Then, I create a Kafka Table like following
> `
> Flink SQL> CREATE TABLE MyUserTable (
> > content String
> > ) WITH (
> > 'connector.type' = 'kafka',
> > 'connector.version' = 'universal',
> > 'connector.topic' = 'test',
> > 'connector.properties.zookeeper.connect' = 'localhost:2181',
> > 'connector.properties.bootstrap.servers' = 'localhost:9092',
> > 'connector.properties.group.id' = 'testGroup',
> > 'connector.startup-mode' = 'earliest-offset',
> > 'format.type' = 'csv'
> > );
> [INFO] Table has been created.
> `
> Then I select from just created table and an exception been thrown:
> `
> Flink SQL> select * from MyUserTable;
> [ERROR] Could not execute SQL statement. Reason:
> org.apache.flink.table.api.NoMatchingTableFactoryException: Could not find a
> suitable table factory for
> 'org.apache.flink.table.factories.TableSourceFactory' in
> the classpath.
> Reason: Required context properties mismatch.
> The matching candidates:
> org.apache.flink.table.sources.CsvBatchTableSourceFactory
> Mismatched properties:
> 'connector.type' expects 'filesystem', but is 'kafka'
> The following properties are requested:
> connector.properties.bootstrap.servers=localhost:9092
> connector.properties.group.id=testGroup
> connector.properties.zookeeper.connect=localhost:2181
> connector.startup-mode=earliest-offset
> connector.topic=test
> connector.type=kafka
> connector.version=universal
> format.type=csv
> schema.0.data-type=VARCHAR(2147483647)
> schema.0.name=content
> The following factories have been considered:
> org.apache.flink.table.sources.CsvBatchTableSourceFactory
> org.apache.flink.table.sources.CsvAppendTableSourceFactory
> `
> Potential Reasons:
> Now we use `TableFactoryUtil#findAndCreateTableSource` to convert a
> CatalogTable to TableSource, but when call `TableFactoryService.find` we
> don't pass current classLoader to this method, the default loader will be
> BootStrapClassLoader, which can not find our factory.
> I verified in my box, it's truly caused by this behavior.
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