Spring Boot and Logback by Example - spring

Question

I have a Spring Boot app that (basically) has the following project structure:
myapp/
src/
<All Java source code here>
build.gradle
application.yml
logback.groovy
And its build.gradle dependencies are:
dependencies {
compile(
'org.springframework.boot:spring-boot-starter-actuator'
,'org.springframework.boot:spring-boot-starter-jetty'
,'org.springframework.boot:spring-boot-starter-security'
,'org.springframework.boot:spring-boot-starter-thymeleaf'
,'org.apache.commons:commons-lang3:3.4'
,'ch.qos.logback:logback-parent:1.1.7'
)
compile('org.springframework.boot:spring-boot-starter-web') {
exclude module: 'spring-boot-starter-tomcat'
}
}
The application.yml:
logging:
level:
org.springframework.web: 'DEBUG'
server:
error:
whitelabel:
enabled: false
spring:
datasource:
test-on-borrow: true
validation-query: SELECT 1
messages:
basename: i18n/messages
And the logback.groovy:
statusListener(OnConsoleStatusListener)
appender('CONSOLE', ConsoleAppender) {
encoder(PatternLayoutEncoder) {
pattern = '%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n'
}
}
appender('ROLLING', RollingFileAppender) {
encoder(PatternLayoutEncoder) {
Pattern = '%d %level %thread %mdc %logger - %m%n'
}
rollingPolicy(TimeBasedRollingPolicy) {
FileNamePattern = '/Users/myuser/logs/myapp/myapp-%d{yyyy-MM}.zip'
}
}
When I run ./gradlew bootRun -Pspring.config=. (where spring.config=. implies the myapp/application.yml config file), I see console output only. Nothing gets logged to /Users/myuser/logs/myapp/. Any ideas as to why?
Update
I have created a barebones Spring Boot app that uses my identical Logback config:
https://github.com/hotmeatballsoup/spring-boot-logback-example
Clone it and run it by running:
./gradlew bootRun -Pspring.config=.
Note that even though the app starts up fine (and you will see lots of console output), that it does not in fact create a /var/log/spring-boot-logback-example/spring-boot-logback-example.log file as expected!

Answer 1

add to following to logback.groovy
root(DEBUG, ["CONSOLE", "ROLLING"])

Answer 2

I am able to run the application successfully after making the following changes to your code:
Moved line root(DEBUG, ["CONSOLE", "ROLLING"]) in logback.groovy to the last line, after the appenders are declared
I changed the path of the log file from /var/log to home directory and the logs started appearing in console and log file. The reason for logs not being generated in /var/log directory is lack of permissions

Answer 3

Create a src/main/resources folder and place logback.groovy in it.
That worked for me with your project (cloned from Github) and the following logback file:
import ch.qos.logback.classic.encoder.PatternLayoutEncoder
import ch.qos.logback.core.rolling.RollingFileAppender
import ch.qos.logback.core.rolling.TimeBasedRollingPolicy
import static ch.qos.logback.classic.Level.DEBUG
appender("FILE", RollingFileAppender) {
file = "logFile.log"
rollingPolicy(TimeBasedRollingPolicy) {
fileNamePattern = "logFile.%d{yyyy-MM-dd}.log"
maxHistory = 30
}
encoder(PatternLayoutEncoder) {
pattern = "%-4relative [%thread] %-5level %logger{35} - %msg%n"
}
}
root(DEBUG, ["FILE"])

Answer 4

With logback/spring boot and a groovy config. The custom log configuration should be in a file named logback-spring.groovy instead of logback.groovy
The file should exist in src/main/resources.
see reference spring boot logging docs