How can I provide login credentials to Spring Cloud Config Server so that the Log4j2 configuration file is downloaded?

[luidoc]

Versions:

spring-boot-starter-parent : 3.3.2
spring-cloud-dependencies: 2023.0.3
jdk: 21

Details:

My "Spring Cloud Config Server" has a security configuration applied, therefore authentication is required to access the service.

spring:
   security:
      user:
         name: root
         password: password

The source code can be seen at https://github.com/luidoc/demo-config-server-native.git

On the other hand, I have a sample application that uses the "Spring Cloud Config Server" service, both to obtain its configuration file and to obtain the log4j2 configuration file (log4j2-spring.xml).
The source code can be seen at https://github.com/luidoc/config-server-client.git

Below I show the bootstrap.yml configuration file:

spring:
    main:
        allow-bean-definition-overriding: true
    profiles:
      active: dev
    application:
        name: config-server-client
    config:
        import: optional:configserver=${spring.cloud.config.url}
    cloud:
        config:
            url: http://localhost:8888
            uri: http://localhost:8888
            username: root
            password: 'password'
            name: ${spring.application.name}
            profile: dev
            label: main
logging:
    config: ${spring.cloud.config.url}/${spring.application.name}/${spring.cloud.config.profile}/${spring.cloud.config.label}/log4j2-spring.xml?resolvePlaceholders=false
log4j2:
    Configuration:
        allowedProtocols: 'http,https'

When running the sample application, it fails to obtain the log4j2 configuration file from the "Config Server" service, resulting in an http 401 error.

The error trace can be seen below:

java -jar .\target\config-server-client.jar
Logging system failed to initialize using configuration from 'http://localhost:8888/config-server-client/dev/main/log4j2-spring.xml?resolvePlaceholders=false'
java.lang.IllegalStateException: Could not initialize Log4J2 logging from http://localhost:8888/config-server-client/dev/main/log4j2-spring.xml?resolvePlaceholders=false
        at org.apache.logging.log4j.spring.boot.Log4j2SpringBootLoggingSystem.loadConfiguration(Log4j2SpringBootLoggingSystem.java:198)
        at org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.load(Log4J2LoggingSystem.java:246)
        at org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.loadConfiguration(Log4J2LoggingSystem.java:238)
        at org.springframework.boot.logging.AbstractLoggingSystem.initializeWithSpecificConfig(AbstractLoggingSystem.java:67)
        at org.springframework.boot.logging.AbstractLoggingSystem.initialize(AbstractLoggingSystem.java:58)
        at org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.initialize(Log4J2LoggingSystem.java:225)
        at org.apache.logging.log4j.spring.boot.Log4j2SpringBootLoggingSystem.initialize(Log4j2SpringBootLoggingSystem.java:96)
        at org.springframework.boot.context.logging.LoggingApplicationListener.initializeSystem(LoggingApplicationListener.java:335)
        at org.springframework.boot.context.logging.LoggingApplicationListener.initialize(LoggingApplicationListener.java:298)
        at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEnvironmentPreparedEvent(LoggingApplicationListener.java:246)
        at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:223)
        at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:185)
        at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:178)
        at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:156)
        at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:138)
        at org.springframework.boot.context.event.EventPublishingRunListener.multicastInitialEvent(EventPublishingRunListener.java:136)
        at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:81)
        at org.springframework.boot.SpringApplicationRunListeners.lambda$environmentPrepared$2(SpringApplicationRunListeners.java:64)
        at java.base/java.lang.Iterable.forEach(Iterable.java:75)
        at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:118)
        at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:112)
        at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:63)
        at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:370)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:330)
        at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:149)
        at org.springframework.cloud.bootstrap.BootstrapApplicationListener.bootstrapServiceContext(BootstrapApplicationListener.java:195)
        at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:114)
        at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:77)
        at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:185)
        at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:178)
        at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:156)
        at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:138)
        at org.springframework.boot.context.event.EventPublishingRunListener.multicastInitialEvent(EventPublishingRunListener.java:136)
        at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:81)
        at org.springframework.boot.SpringApplicationRunListeners.lambda$environmentPrepared$2(SpringApplicationRunListeners.java:64)
        at java.base/java.lang.Iterable.forEach(Iterable.java:75)
        at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:118)
        at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:112)
        at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:63)
        at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:370)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:330)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1363)
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1352)
        at com.example.demo.ConfigServerClientApplication.main(ConfigServerClientApplication.java:10)
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103)
        at java.base/java.lang.reflect.Method.invoke(Method.java:580)
        at org.springframework.boot.loader.launch.Launcher.launch(Launcher.java:91)
        at org.springframework.boot.loader.launch.Launcher.launch(Launcher.java:53)
        at org.springframework.boot.loader.launch.JarLauncher.main(JarLauncher.java:58)
Caused by: java.io.IOException: Server returned HTTP response code: 401 for URL: http://localhost:8888/config-server-client/dev/main/log4j2-spring.xml?resolvePlaceholders=false
        at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1998)
        at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1599)
        at org.apache.logging.log4j.spring.boot.Log4j2SpringBootLoggingSystem.getConfigurationSource(Log4j2SpringBootLoggingSystem.java:247)
        at org.apache.logging.log4j.spring.boot.Log4j2SpringBootLoggingSystem.loadConfiguration(Log4j2SpringBootLoggingSystem.java:159)
        ... 48 more
18:44:35.385 [main] ERROR org.springframework.boot.SpringApplication - Application run failed
java.lang.IllegalStateException: java.lang.IllegalStateException: Could not initialize Log4J2 logging from http://localhost:8888/config-server-client/dev/main/log4j2-spring.xml?resolvePlaceholders=false
        at org.springframework.boot.context.logging.LoggingApplicationListener.initializeSystem(LoggingApplicationListener.java:347) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.context.logging.LoggingApplicationListener.initialize(LoggingApplicationListener.java:298) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEnvironmentPreparedEvent(LoggingApplicationListener.java:246) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:223) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:185) ~[spring-context-6.1.11.jar!/:6.1.11]
        at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:178) ~[spring-context-6.1.11.jar!/:6.1.11]
        at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:156) ~[spring-context-6.1.11.jar!/:6.1.11]
        at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:138) ~[spring-context-6.1.11.jar!/:6.1.11]
        at org.springframework.boot.context.event.EventPublishingRunListener.multicastInitialEvent(EventPublishingRunListener.java:136) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:81) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplicationRunListeners.lambda$environmentPrepared$2(SpringApplicationRunListeners.java:64) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at java.base/java.lang.Iterable.forEach(Iterable.java:75) ~[?:?]
        at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:118) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:112) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:63) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:370) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:330) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:149) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.cloud.bootstrap.BootstrapApplicationListener.bootstrapServiceContext(BootstrapApplicationListener.java:195) ~[spring-cloud-context-4.1.4.jar!/:4.1.4]
        at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:114) ~[spring-cloud-context-4.1.4.jar!/:4.1.4]
        at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:77) ~[spring-cloud-context-4.1.4.jar!/:4.1.4]
        at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:185) ~[spring-context-6.1.11.jar!/:6.1.11]
        at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:178) ~[spring-context-6.1.11.jar!/:6.1.11]
        at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:156) ~[spring-context-6.1.11.jar!/:6.1.11]
        at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:138) ~[spring-context-6.1.11.jar!/:6.1.11]
        at org.springframework.boot.context.event.EventPublishingRunListener.multicastInitialEvent(EventPublishingRunListener.java:136) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:81) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplicationRunListeners.lambda$environmentPrepared$2(SpringApplicationRunListeners.java:64) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at java.base/java.lang.Iterable.forEach(Iterable.java:75) [?:?]
        at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:118) [spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:112) [spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:63) [spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:370) [spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:330) [spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1363) [spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1352) [spring-boot-3.3.2.jar!/:3.3.2]
        at com.example.demo.ConfigServerClientApplication.main(ConfigServerClientApplication.java:10) [!/:1.0.0-SNAPSHOT]
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ~[?:?]
        at java.base/java.lang.reflect.Method.invoke(Method.java:580) ~[?:?]
        at org.springframework.boot.loader.launch.Launcher.launch(Launcher.java:91) [config-server-client.jar:1.0.0-SNAPSHOT]
        at org.springframework.boot.loader.launch.Launcher.launch(Launcher.java:53) [config-server-client.jar:1.0.0-SNAPSHOT]
        at org.springframework.boot.loader.launch.JarLauncher.main(JarLauncher.java:58) [config-server-client.jar:1.0.0-SNAPSHOT]
Caused by: java.lang.IllegalStateException: Could not initialize Log4J2 logging from http://localhost:8888/config-server-client/dev/main/log4j2-spring.xml?resolvePlaceholders=false
        at org.apache.logging.log4j.spring.boot.Log4j2SpringBootLoggingSystem.loadConfiguration(Log4j2SpringBootLoggingSystem.java:198) ~[log4j-spring-boot-2.23.1.jar!/:2.23.1]
        at org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.load(Log4J2LoggingSystem.java:246) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.loadConfiguration(Log4J2LoggingSystem.java:238) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.logging.AbstractLoggingSystem.initializeWithSpecificConfig(AbstractLoggingSystem.java:67) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.logging.AbstractLoggingSystem.initialize(AbstractLoggingSystem.java:58) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.initialize(Log4J2LoggingSystem.java:225) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.apache.logging.log4j.spring.boot.Log4j2SpringBootLoggingSystem.initialize(Log4j2SpringBootLoggingSystem.java:96) ~[log4j-spring-boot-2.23.1.jar!/:2.23.1]
        at org.springframework.boot.context.logging.LoggingApplicationListener.initializeSystem(LoggingApplicationListener.java:335) ~[spring-boot-3.3.2.jar!/:3.3.2]
        ... 41 more
Caused by: java.io.IOException: Server returned HTTP response code: 401 for URL: http://localhost:8888/config-server-client/dev/main/log4j2-spring.xml?resolvePlaceholders=false
        at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1998) ~[?:?]
        at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1599) ~[?:?]
        at org.apache.logging.log4j.spring.boot.Log4j2SpringBootLoggingSystem.getConfigurationSource(Log4j2SpringBootLoggingSystem.java:247) ~[log4j-spring-boot-2.23.1.jar!/:2.23.1]
        at org.apache.logging.log4j.spring.boot.Log4j2SpringBootLoggingSystem.loadConfiguration(Log4j2SpringBootLoggingSystem.java:159) ~[log4j-spring-boot-2.23.1.jar!/:2.23.1]
        at org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.load(Log4J2LoggingSystem.java:246) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.loadConfiguration(Log4J2LoggingSystem.java:238) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.logging.AbstractLoggingSystem.initializeWithSpecificConfig(AbstractLoggingSystem.java:67) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.logging.AbstractLoggingSystem.initialize(AbstractLoggingSystem.java:58) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.initialize(Log4J2LoggingSystem.java:225) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.apache.logging.log4j.spring.boot.Log4j2SpringBootLoggingSystem.initialize(Log4j2SpringBootLoggingSystem.java:96) ~[log4j-spring-boot-2.23.1.jar!/:2.23.1]
        at org.springframework.boot.context.logging.LoggingApplicationListener.initializeSystem(LoggingApplicationListener.java:335) ~[spring-boot-3.3.2.jar!/:3.3.2]
        ... 41 more
18:44:35.412 [main] ERROR org.springframework.boot.SpringApplication - Application run failed
java.lang.IllegalStateException: java.lang.IllegalStateException: Could not initialize Log4J2 logging from http://localhost:8888/config-server-client/dev/main/log4j2-spring.xml?resolvePlaceholders=false
        at org.springframework.boot.context.logging.LoggingApplicationListener.initializeSystem(LoggingApplicationListener.java:347) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.context.logging.LoggingApplicationListener.initialize(LoggingApplicationListener.java:298) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEnvironmentPreparedEvent(LoggingApplicationListener.java:246) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.context.logging.LoggingApplicationListener.onApplicationEvent(LoggingApplicationListener.java:223) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:185) ~[spring-context-6.1.11.jar!/:6.1.11]
        at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:178) ~[spring-context-6.1.11.jar!/:6.1.11]
        at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:156) ~[spring-context-6.1.11.jar!/:6.1.11]
        at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:138) ~[spring-context-6.1.11.jar!/:6.1.11]
        at org.springframework.boot.context.event.EventPublishingRunListener.multicastInitialEvent(EventPublishingRunListener.java:136) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:81) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplicationRunListeners.lambda$environmentPrepared$2(SpringApplicationRunListeners.java:64) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at java.base/java.lang.Iterable.forEach(Iterable.java:75) ~[?:?]
        at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:118) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:112) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:63) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:370) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:330) [spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.builder.SpringApplicationBuilder.run(SpringApplicationBuilder.java:149) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.cloud.bootstrap.BootstrapApplicationListener.bootstrapServiceContext(BootstrapApplicationListener.java:195) ~[spring-cloud-context-4.1.4.jar!/:4.1.4]
        at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:114) ~[spring-cloud-context-4.1.4.jar!/:4.1.4]
        at org.springframework.cloud.bootstrap.BootstrapApplicationListener.onApplicationEvent(BootstrapApplicationListener.java:77) ~[spring-cloud-context-4.1.4.jar!/:4.1.4]
        at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:185) ~[spring-context-6.1.11.jar!/:6.1.11]
        at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:178) ~[spring-context-6.1.11.jar!/:6.1.11]
        at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:156) ~[spring-context-6.1.11.jar!/:6.1.11]
        at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:138) ~[spring-context-6.1.11.jar!/:6.1.11]
        at org.springframework.boot.context.event.EventPublishingRunListener.multicastInitialEvent(EventPublishingRunListener.java:136) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.context.event.EventPublishingRunListener.environmentPrepared(EventPublishingRunListener.java:81) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplicationRunListeners.lambda$environmentPrepared$2(SpringApplicationRunListeners.java:64) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at java.base/java.lang.Iterable.forEach(Iterable.java:75) ~[?:?]
        at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:118) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplicationRunListeners.doWithListeners(SpringApplicationRunListeners.java:112) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplicationRunListeners.environmentPrepared(SpringApplicationRunListeners.java:63) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplication.prepareEnvironment(SpringApplication.java:370) [spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:330) [spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1363) [spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1352) [spring-boot-3.3.2.jar!/:3.3.2]
        at com.example.demo.ConfigServerClientApplication.main(ConfigServerClientApplication.java:10) [!/:1.0.0-SNAPSHOT]
        at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:103) ~[?:?]
        at java.base/java.lang.reflect.Method.invoke(Method.java:580) ~[?:?]
        at org.springframework.boot.loader.launch.Launcher.launch(Launcher.java:91) [config-server-client.jar:1.0.0-SNAPSHOT]
        at org.springframework.boot.loader.launch.Launcher.launch(Launcher.java:53) [config-server-client.jar:1.0.0-SNAPSHOT]
        at org.springframework.boot.loader.launch.JarLauncher.main(JarLauncher.java:58) [config-server-client.jar:1.0.0-SNAPSHOT]
Caused by: java.lang.IllegalStateException: Could not initialize Log4J2 logging from http://localhost:8888/config-server-client/dev/main/log4j2-spring.xml?resolvePlaceholders=false
        at org.apache.logging.log4j.spring.boot.Log4j2SpringBootLoggingSystem.loadConfiguration(Log4j2SpringBootLoggingSystem.java:198) ~[log4j-spring-boot-2.23.1.jar!/:2.23.1]
        at org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.load(Log4J2LoggingSystem.java:246) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.loadConfiguration(Log4J2LoggingSystem.java:238) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.logging.AbstractLoggingSystem.initializeWithSpecificConfig(AbstractLoggingSystem.java:67) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.logging.AbstractLoggingSystem.initialize(AbstractLoggingSystem.java:58) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.initialize(Log4J2LoggingSystem.java:225) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.apache.logging.log4j.spring.boot.Log4j2SpringBootLoggingSystem.initialize(Log4j2SpringBootLoggingSystem.java:96) ~[log4j-spring-boot-2.23.1.jar!/:2.23.1]
        at org.springframework.boot.context.logging.LoggingApplicationListener.initializeSystem(LoggingApplicationListener.java:335) ~[spring-boot-3.3.2.jar!/:3.3.2]
        ... 41 more
Caused by: java.io.IOException: Server returned HTTP response code: 401 for URL: http://localhost:8888/config-server-client/dev/main/log4j2-spring.xml?resolvePlaceholders=false
        at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1998) ~[?:?]
        at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1599) ~[?:?]
        at org.apache.logging.log4j.spring.boot.Log4j2SpringBootLoggingSystem.getConfigurationSource(Log4j2SpringBootLoggingSystem.java:247) ~[log4j-spring-boot-2.23.1.jar!/:2.23.1]
        at org.apache.logging.log4j.spring.boot.Log4j2SpringBootLoggingSystem.loadConfiguration(Log4j2SpringBootLoggingSystem.java:159) ~[log4j-spring-boot-2.23.1.jar!/:2.23.1]
        at org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.load(Log4J2LoggingSystem.java:246) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.loadConfiguration(Log4J2LoggingSystem.java:238) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.logging.AbstractLoggingSystem.initializeWithSpecificConfig(AbstractLoggingSystem.java:67) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.logging.AbstractLoggingSystem.initialize(AbstractLoggingSystem.java:58) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.springframework.boot.logging.log4j2.Log4J2LoggingSystem.initialize(Log4J2LoggingSystem.java:225) ~[spring-boot-3.3.2.jar!/:3.3.2]
        at org.apache.logging.log4j.spring.boot.Log4j2SpringBootLoggingSystem.initialize(Log4j2SpringBootLoggingSystem.java:96) ~[log4j-spring-boot-2.23.1.jar!/:2.23.1]
        at org.springframework.boot.context.logging.LoggingApplicationListener.initializeSystem(LoggingApplicationListener.java:335) ~[spring-boot-3.3.2.jar!/:3.3.2]
        ... 41 more

On the other hand, I can perfectly obtain the configuration file using curl.

curl --location 'http://localhost:8888/config-server-client/dev/main/log4j2-spring.xml?resolvePlaceholders=false' \
--header 'Authorization: Basic cm9vdDpwYXNzd29yZA=='

<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="WARN">
    <Appenders>
        <Console name="Console" target="SYSTEM_OUT">
            <PatternLayout pattern="%d{HH:mm:ss.SSS} [%t] %-5level %logger{36} - %msg %n" />
        </Console>
    </Appenders>
    <Loggers>
        <Root level="debug">
            <AppenderRef ref="Console" />
        </Root>
    </Loggers>
</Configuration>

Is it possible to provide Log4j2 with credentials to access the web service and download the configuration file?

Sample

Config Server: https://github.com/luidoc/demo-config-server-native.git
Demo application: https://github.com/luidoc/config-server-client.git

[luidoc]

According to the documentation https://logging.apache.org/log4j/2.x/manual/configuration.html the credentials are specified with the log4j2.Configuration.username and log4j2.Configuration.password properties.

[ppkarwasz]

Hi @luidoc,

Versions:

spring-boot-starter-parent: 3.3.2
spring-cloud-dependencies: 2023.0.3
jdk: 21
...
at org.apache.logging.log4j.spring.boot.Log4j2SpringBootLoggingSystem.loadConfiguration(Log4j2SpringBootLoggingSystem.java:198)

The org.apache.logging.log4j.spring.boot.Log4j2SpringBootLoggingSystem class is part of the log4j-spring-boot artifact, which support Spring Boot 2.x only. Since Spring Boot 3.x its functionality has been integrated into spring-boot itself (cf. Log4j 2 Extensions). Please, remove log4j-spring-boot from your classpath.

The current documentation will be replaced with a more navigable version soon: see Transport Security for all the Log4j Configuration properties involved into establishing a secure connection.

[rgoers]

We use this configuration in our bootstrap.yml file to connect to SCC for both the application config and the logging config.

spring:
  application:
    name: my-service
  cloud:
    config:
      uri: https://spring-configuration-server.mycorp.com
      username: [email protected]
      password: Abc!@#123

logging:
  config: "https://spring-configuration-server.mycorp.com/${spring.application.name}/default/${logging.label}/log4j2-json-dev.xml"
    log4j2:
    config:
      override: "https://spring-configuration-server.mycorp.com/${spring.application.name}/default/${logging.label}/log4j2-${spring.application.name}-dev.xml"
  label: ${spring.cloud.config.label:master}
  auth:
    username: ${spring.cloud.config.username}
    password: ${spring.cloud.config.password}

Note that this configuration will depend on how your SCC server's search path is configured. Ours is just "*" so every directory would be searched. We place the logging config files in the root directory. Using * means you can never have duplicate files even in subdirectories or things will get confusing.

[luidoc]

The final configuration, which works in the example I have provided, is as follows:

spring:
    main:
        allow-bean-definition-overriding: true
    profiles:
      active: dev
    application:
        name: config-server-client
    config:
        import: optional:configserver=${spring.cloud.config.url}
    cloud:
        config:
            url: http://localhost:8888
            uri: http://localhost:8888
            username: root
            password: 'password'
            name: ${spring.application.name}
            profile: dev
            label: main
logging:
    config: ${spring.cloud.config.url}/${spring.application.name}/${spring.cloud.config.profile}/${spring.cloud.config.label}/log4j2-spring.xml?resolvePlaceholders=false
    auth:
        username: ${spring.cloud.config.username}
        password: ${spring.cloud.config.password}
log4j2:
    Configuration:
        allowedProtocols: 'http,https'

I've added the "allowedProtocols" property, to allow using http in this simple example, since by default only https is enabled.
In the example provided by "rgoers", I think that "log4j2:" is missing under logging->config, it could even be an error.

[rgoers]

In our configuration all the Log4j2 variables are escaped. I hadn't thought to disable resolvePlaceholders.

I think there is just something wrong with the formatting in this discussion. In my example "logging.config" and "logging.log4j2" should be at the same level, at least for the override. Since allowedProtocols is a Log4j property you have it specified correctly. My setup uses https so I don't need that setting.

[Paulal2000]

The configuration given to resolve this issue works with Spring Boot 2, but not with Spring Boot 3.

logging:
    config: ${spring.cloud.config.url}/${spring.application.name}/${spring.cloud.config.profile}/${spring.cloud.config.label}/log4j2-spring.xml?resolvePlaceholders=false
    auth:
        username: ${spring.cloud.config.username}
        password: ${spring.cloud.config.password}

Using Spring Boot 3 it seems that Log4j2 configuration is done before the decryption of the property spring.cloud.config.password, therefore the "Config Server" service responds an http 401 error.
Could someone tell me how to solve this problem? Thx!