SpringApplicationShutdownHook throws ClassCastException when use log4j2 #26953
Description
Hi.
I get the exception when try to replace logging module with log4j2 in spring boot version 2.5.1.
This error doesn't occur in 2.4.7 and below.
Exception in thread "SpringApplicationShutdownHook" java.lang.ClassCastException: org.apache.logging.log4j.simple.SimpleLoggerContext cannot be cast to org.apache.logging.log4j.core.LoggerContext
at org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.getLoggerContext(Log4J2LoggingSystem.java:329)
at org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.lambda$getShutdownHandler$2(Log4J2LoggingSystem.java:304)
at java.lang.Iterable.forEach(Iterable.java:75)
at org.springframework.boot.SpringApplicationShutdownHook.run(SpringApplicationShutdownHook.java:102)
at java.lang.Thread.run(Thread.java:748)
I also tried to downgrade log4j to 2.13.x, but it didn't help.
Dependencies
import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
plugins {
id("org.springframework.boot") version "2.5.1"
id("io.spring.dependency-management") version "1.0.11.RELEASE"
kotlin("jvm") version "1.5.10"
kotlin("plugin.spring") version "1.5.10"
id("com.google.protobuf") version "0.8.16"
id("idea")
}
group = "some.package"
version = "1.0.0-SNAPSHOT"
java.sourceCompatibility = JavaVersion.VERSION_1_8
repositories {
mavenCentral()
}
dependencies {
implementation("org.springframework.boot:spring-boot-starter-actuator")
implementation("org.springframework.boot:spring-boot-starter-data-r2dbc")
implementation("org.springframework.boot:spring-boot-starter-oauth2-client")
implementation("org.springframework.boot:spring-boot-starter-rsocket")
implementation("org.springframework.boot:spring-boot-starter-security")
implementation("org.springframework.boot:spring-boot-starter-validation")
implementation("org.springframework.boot:spring-boot-starter-webflux")
implementation("org.springframework.boot:spring-boot-starter-log4j2")
implementation("org.springframework.security:spring-security-messaging")
implementation("org.springframework.security:spring-security-rsocket")
implementation("org.springframework.boot:spring-boot-starter-cache")
developmentOnly("org.springframework.boot:spring-boot-devtools")
implementation("com.fasterxml.jackson.module:jackson-module-kotlin")
implementation("org.ehcache:ehcache:3.8.1")
implementation("javax.cache:cache-api:1.1.1")
implementation("org.flywaydb:flyway-core:7.10.0")
implementation("com.lmax:disruptor:3.4.2")
implementation("io.projectreactor.kotlin:reactor-kotlin-extensions")
implementation("org.jetbrains.kotlin:kotlin-reflect")
implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
implementation("org.jetbrains.kotlinx:kotlinx-coroutines-reactor")
runtimeOnly("io.micrometer:micrometer-registry-prometheus")
runtimeOnly("io.r2dbc:r2dbc-postgresql")
testImplementation("org.springframework.boot:spring-boot-starter-test")
testImplementation("io.projectreactor:reactor-test")
testImplementation("org.springframework.security:spring-security-test")
}
configurations {
all {
exclude(group = "org.springframework.boot", module = "spring-boot-starter-logging")
exclude(group = "org.springframework.boot", module = "spring-boot-starter-tomcat")
exclude(group = "org.apache.tomcat.embed", module = "tomcat-embed-el")
exclude(group = "org.jetbrains.kotlin", module = "kotlin-stdlib-jdk7")
}
}
tasks.withType<KotlinCompile> {
kotlinOptions {
freeCompilerArgs = listOf("-Xjsr305=strict")
jvmTarget = "1.8"
}
}
tasks.withType<Test> {
useJUnitPlatform()
}
log4j2.xml
<?xml version="1.0" encoding="UTF-8"?>
<Configguration>
<Appenders>
<Console name="Console" target="SYSTEM_OUT">
<PatternLayout>
<Pattern>%d{yyyy-MM-dd HH:mm:ss.SSS} [%style{%t}{normal,red}] %highlight{%-5level } %style{%logger{36}}{bright,blue} %X - %msg %throwable%n</Pattern>
</PatternLayout>
</Console>
<Async name="AsyncConsole">
<AppenderRef ref="Console"/>
</Async>
</Appenders>
<Loggers>
<Logger name="some.package" level="DEBUG" additivity="false">
<AppenderRef ref="AsyncConsole"/>
</Logger>
<Root level="WARN" additivity="false">
<AppenderRef ref="AsyncConsole"/>
</Root>
</Loggers>
</Configguration>