[jira] [Created] (KAFKA-7155) the property CONFIG of the ProducerConfig maybe null.

["zhangjk (JIRA)" <ji...@apache.org>]

zhangjk created KAFKA-7155:
------------------------------

             Summary: the property CONFIG of the ProducerConfig maybe null.
                 Key: KAFKA-7155
                 URL: https://issues.apache.org/jira/browse/KAFKA-7155
             Project: Kafka
          Issue Type: Bug
          Components: clients
    Affects Versions: 1.1.0
         Environment: scala  2.12.6
kafka  1.1.0
log4j2  2.11.0
            Reporter: zhangjk


hi:

When i use the log4j2's KafkaAppender , I found a bug.  the property CONFIG of the ProducerConfig.

here's my code:
{code:java}
log4j2.xml
<Appenders>
    <Kafka name="Kafka" topic="test" key ="KafkaTestKey">
        <PatternLayout pattern="%d{yyyy.MM.dd 'at' HH:mm:ss z} %-5level %class{36} %L %M - %msg%xEx%n"/>
        <Property name="bootstrap.servers">localhost:9092</Property>
    </Kafka>
</Appenders>
{code}
{code:java}
object KafkaTest extends App {
  val p = new Producer
}

{code}
{code:java}
class Producer {
  val props = {
    val p = new Properties()
    ....
    p
  }

  val producer = {
    val p = new KafkaProducer[Integer, String](props)
    p
  }
}
{code}
The reason for this BUG is that: 

the `new Producer` is first initialized, and the `ProducerConfig` has a static method block, and it called the `CommonClientConfigs` class. in the `CommonClientConfigs`,  it has a Log property,

so, this will initialize the Log4j2's configuration, and this will call a startup method of the Appender, and it actually calls the KafkaAppender's method. and then the method create a new `KafkaProducer`, this will create a new `ProducerConfig` instance, but the static method block is not completed, so the `CONFIG` is null.  this cause the `NullPointerException`

 

my english is bad, so , hope to understand what i mean

 

 



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