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https://issues.apache.org/jira/browse/LOG4J2-3396?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17496251#comment-17496251
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Ralph Goers commented on LOG4J2-3396:
-------------------------------------
Yes, Gary is mistaken. MongoDB may log to SLF4J but then that is bridged to
Log4j which then tries to log it to MongoDB and it all starts over again.
> ERROR Recursive call to appender mongodb with spring boot root logger
> ---------------------------------------------------------------------
>
> Key: LOG4J2-3396
> URL: https://issues.apache.org/jira/browse/LOG4J2-3396
> Project: Log4j 2
> Issue Type: Question
> Components: MongoDB
> Affects Versions: 2.17.1
> Reporter: Omer U
> Priority: Major
>
> If mongodb4 logger is used as root logger in basic spring boot rest
> application, it causes some sort of recursion error. And stalls startup.
> below causes recursive call error
> {code:xml}
> <Root level="INFO">
> <AppenderRef ref="Console" />
> <AppenderRef ref="mongodb" />
> </Root>
> {code}
> while following does not produce error
> {code:xml}
> <Loggers>
> <Root level="INFO">
> <AppenderRef ref="Console" />
> </Root>
> <Logger name="com.example" level="TRACE">
> <AppenderRef ref="mongodb" >
> </Logger>
> <Logger name="io.grpc" level="INFO"/>
> </Loggers>
> {code}
>
> {noformat}
> 2022-02-07 23:35:43,487 cluster-ClusterId{value='620182632ff6a504abdb6699',
> description='null'}-localhost:27017 ERROR Recursive call to appender mongodb
> 23:36:13.481 [st:27017] INFO o.m.d.cluster - Cluster description not yet
> available. Waiting for 30000 ms before timing out
> 2022-02-07 23:36:13,480
> cluster-rtt-ClusterId{value='620182632ff6a504abdb6697',
> description='null'}-localhost:27017 ERROR Unable to write to database
> [noSqlManager{ description=mongodb, bufferSize=0, provider=MongoDb4Provider
> [connectionString=mongodb://localhost:27017/tombolog.mongo4test,
> collectionSize=1073741824, isCapped=true,
> mongoClient=com.mongodb.client.internal.MongoClientImpl@2f67a4d3,
> mongoDatabase=com.mongodb.client.internal.MongoDatabaseImpl@5e3f861] }] for
> appender [mongodb].
> org.apache.logging.log4j.core.appender.AppenderLoggingException: Failed to
> write log event to MongoDB due to error: Timed out after 30000 ms while
> waiting to connect. Client view of cluster state is {type=UNKNOWN,
> servers=[{address=localhost:27017, type=UNKNOWN, state=CONNECTING}]
> {noformat}
> full log4j2.xml file
> {code:xml}
> <?xml version="1.0" encoding="UTF-8"?>
> <Configuration status="INFO">
> <Appenders>
> <Console name="Console" target="SYSTEM_OUT">
> <PatternLayout pattern="%d{HH:mm:ss.SSS} [%.8t] %-5level %logger{1.} -
> %msg%n"/>
> </Console>
> <NoSql name="mongodb">
> <MongoDb4 capped="true" collectionSize="1073741824"
> connection="${env:MONGO_LOG_URI:-mongodb://localhost:27017/log.mongo4test}" />
> </NoSql>
> </Appenders>
> <Loggers>
> <Root level="INFO">
> <AppenderRef ref="Console" />
> <AppenderRef ref="mongodb" />
> </Root>
> <Logger name="com.example" level="TRACE"/>
> <Logger name="io.grpc" level="INFO"/>
> </Loggers>
> </Configuration>
> {code}
> build.gradle
> {code:groovy}
> plugins {
> id 'org.springframework.boot' version '2.6.3'
> id 'io.spring.dependency-management' version '1.0.11.RELEASE'
> id 'java'
> }
> group = 'com.example'
> version = '0.0.1-SNAPSHOT'
> sourceCompatibility = '11'
> ext ['log4j2.version'] = '2.17.2-SNAPSHOT'
> repositories {
> mavenCentral()
> maven {
> url "http://repository.apache.org/content/repositories/snapshots/";
> }
> }
> dependencies {
> implementation group: 'org.apache.logging.log4j', name:
> 'log4j-mongodb4', version: '2.17.2-SNAPSHOT'
> implementation 'org.springframework.boot:spring-boot-starter-web'
> implementation 'org.springframework.boot:spring-boot-starter-log4j2'
> testImplementation 'org.springframework.boot:spring-boot-starter-test'
> }
> configurations {
> all {
> exclude group: 'org.springframework.boot', module:
> 'spring-boot-starter-logging'
> exclude group: 'org.springframework.boot', module:
> 'logback-classic'
> }
> }
> tasks.named('test') {
> useJUnitPlatform()
> }
> {code}
> is this normal behavior? I have tried to reproduce this without spring boot
> without any success.
> Any ideas?
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