SpringBoot 2.3.5 actuator different port causes FileNotFoundException: /dev/management_stdout

Question

Requirement

• We need to change the actuator endpoints to be on a different port number
• Changing the value of management.server.port: 8404 causes an exception as the server configures the new port to stream logs to /dev/management_stdout when it should be /dev/stdout (already configured for the server).

SpringBoot 2.3.5 Setup

buildscript {
    repositories {
        mavenCentral()

        // For src/gradle/tests.gradle
        maven {
            url "https://plugins.gradle.org/m2/"
        }
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:2.3.5.RELEASE")
    }
}

dependencies {
    implementation('org.springframework.boot:spring-boot-starter-actuator')
}

Changing SpringBoot Actuator

• Changed the port number as follows in application.yaml

management:
  endpoints:
    web:
      exposure:
        include: "*"
  server:
    port: 8404

Error shown during bootstrap

• The default logger is trying to write to /dev/management_stdout

2020-11-15T17:23:41 ERROR [app=parking-plus-service,prf=default][tid=,sid=,sxp=][cid=] 77926 --- [  restartedMain] o.apache.catalina.valves.AccessLogValve  : Failed to open access log file [/dev/management_stdout]

java.io.FileNotFoundException: /dev/management_stdout (Operation not permitted)
    at java.base/java.io.FileOutputStream.open0(Native Method)
    at java.base/java.io.FileOutputStream.open(FileOutputStream.java:291)
    at java.base/java.io.FileOutputStream.<init>(FileOutputStream.java:234)
    at org.apache.catalina.valves.AccessLogValve.open(AccessLogValve.java:651)
    at org.apache.catalina.valves.AccessLogValve.startInternal(AccessLogValve.java:685)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.StandardPipeline.startInternal(StandardPipeline.java:176)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.ContainerBase.startInternal(ContainerBase.java:933)
    at org.apache.catalina.core.StandardEngine.startInternal(StandardEngine.java:262)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.StandardService.startInternal(StandardService.java:421)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.core.StandardServer.startInternal(StandardServer.java:930)
    at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:183)
    at org.apache.catalina.startup.Tomcat.start(Tomcat.java:486)
    at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.initialize(TomcatWebServer.java:123)
    at org.springframework.boot.web.embedded.tomcat.TomcatWebServer.<init>(TomcatWebServer.java:104)
    at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getTomcatWebServer(TomcatServletWebServerFactory.java:440)
    at org.springframework.boot.web.embedded.tomcat.TomcatServletWebServerFactory.getWebServer(TomcatServletWebServerFactory.java:193)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.createWebServer(ServletWebServerApplicationContext.java:178)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.onRefresh(ServletWebServerApplicationContext.java:158)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:545)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143)
    at org.springframework.boot.actuate.autoconfigure.web.server.ManagementContextAutoConfiguration$DifferentManagementContextConfiguration.onApplicationEvent(ManagementContextAutoConfiguration.java:142)
    at org.springframework.boot.actuate.autoconfigure.web.server.ManagementContextAutoConfiguration$DifferentManagementContextConfiguration.onApplicationEvent(ManagementContextAutoConfiguration.java:114)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165)
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139)
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:404)
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:361)
    at org.springframework.boot.web.servlet.context.WebServerStartStopLifecycle.start(WebServerStartStopLifecycle.java:46)
    at org.springframework.context.support.DefaultLifecycleProcessor.doStart(DefaultLifecycleProcessor.java:182)
    at org.springframework.context.support.DefaultLifecycleProcessor.access$200(DefaultLifecycleProcessor.java:53)
    at org.springframework.context.support.DefaultLifecycleProcessor$LifecycleGroup.start(DefaultLifecycleProcessor.java:360)
    at org.springframework.context.support.DefaultLifecycleProcessor.startBeans(DefaultLifecycleProcessor.java:158)
    at org.springframework.context.support.DefaultLifecycleProcessor.onRefresh(DefaultLifecycleProcessor.java:122)
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:895)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:554)
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750)
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:405)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226)
    at cash.super_.platform.service.ParkingPlusApplication.main(ParkingPlusApplication.java:12)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:564)
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)

Question

• Which property sets the file name prefix stdout just like on the server settings shown below?
  • Maybe the management embedded tomcat is taking the value of directory and using the prefix as management_stdout as the value of the file?

server:
  #port: 8080 default
  tomcat:
    accesslog:
      enabled: true
      directory: /dev
      prefix: stdout
      buffered: false
      suffix:
      file-date-format:

Commutative

Answer 1

This solution will work for version 2.3.5 :

Open your application.properties or application.yml file.

Add or modify the following property to specify the log file location:

For application.properties:

logging.file=/dev/stdout

For application.yml:

logging:
  file: /dev/stdout

By explicitly setting the log file to /dev/stdout, you ensure that the logs are streamed to the standard output, which is what you want.

Save the changes and restart your application.

Scrivenor

Will it affect both management and the app logs? how would they go to different files? is this on 2.3.5 or newer versions? can you please specify in your answer? – Commutative

It is in 2.3.5 version. – Scrivenor