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https://issues.apache.org/jira/browse/LOG4J2-2375?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16551767#comment-16551767
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Gary Gregory commented on LOG4J2-2375:
--------------------------------------
PRs are welcome, with a unit tests of course ;)
> When KafkaAppender is used with other KafkaProducer, there is a problem.
> ------------------------------------------------------------------------
>
> Key: LOG4J2-2375
> URL: https://issues.apache.org/jira/browse/LOG4J2-2375
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 2.11.0
> Environment: scala 2.12.6
> kafka 1.1.0
> log4j2 2.11.0
> Reporter: zhangjk
> Priority: Critical
>
> hi:
> When i use the log4j2's KafkaAppender , I found a bug. the property CONFIG
> of the ProducerConfig is null.
> here's my code:
> log4j2.xml
> {code:java}
> <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}
> the main class:
> {code:java}
> object KafkaTest extends App {
> // this is scala code.
> // create a KafkaProducer
> val p = new Producer
> }
> {code}
> 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` class, it has a
> static Log property, so, this will initialize the Log4j2's configuration, and
> this will call a startup method of the Appender, 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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