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https://issues.apache.org/jira/browse/KAFKA-13793?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Mickael Maison resolved KAFKA-13793.
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Fix Version/s: 3.3.0
Resolution: Fixed
> Add validators for serialization and deserialization related configuration
> --------------------------------------------------------------------------
>
> Key: KAFKA-13793
> URL: https://issues.apache.org/jira/browse/KAFKA-13793
> Project: Kafka
> Issue Type: Improvement
> Components: clients, config
> Reporter: RivenSun
> Assignee: RivenSun
> Priority: Major
> Fix For: 3.3.0
>
>
> These configurations of producer and consumer have the same problem.
> {code:java}
> key.serializer, value.serializer, key.deserializer, value.deserializer{code}
>
> Take the `key.serializer` configuration as an example:
> {code:java}
> Map<String,Object> props = new HashMap<>();
> props.put("key.serializer", null);{code}
> It is expected that this abnormal configuration can be verified during the
> startup process of kafkaProducer, but the actual startup result:
> {code:java}
> Exception in thread "main" org.apache.kafka.common.KafkaException: Failed to
> construct kafka producer
> at
> org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:440)
> at
> org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:291)
> at
> org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:274)
> at
> us.zoom.mq.server.adapter.kafka.ProducerTest.main(ProducerTest.java:139)
> Caused by: java.lang.NullPointerException
> at
> org.apache.kafka.clients.producer.KafkaProducer.<init>(KafkaProducer.java:368)
> ... 3 more {code}
> There was a line of code that threw a null pointer, causing KafkaProducer
> initialization to fail.
> I think we should be able to find this bad configuration during the
> validation of all the configuration i.e. execute the
> *ConfigDef.parseValue(ConfigKey key, Object value, boolean isSet) method* and
> throw a *ConfigException* instead of NullPointerException.
> Solution:
> Add *NonNullValidator* to these configurations.
> For example, when ProducerConfig defines `key.serializer` configuration, add
> Validator:
> {code:java}
> .define(KEY_SERIALIZER_CLASS_CONFIG,
> Type.CLASS,
> ConfigDef.NO_DEFAULT_VALUE,
> new ConfigDef.NonNullValidator(),
> Importance.HIGH,
> KEY_SERIALIZER_CLASS_DOC) {code}
>
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