Spring-Boot Embedded Tomcat - generate localhost.log and cataline.out files - spring-boot

Question

I have a spring-boot application running with an embedded tomcat. We are using logback and slf4j for logging.
I am trying to figure ways to generate catalina.out and localhost.log files through spring-boot application. It looks like catalina.out is generated by the start-up script that initiates the tomcat container in a stand-alone mode, catalina.out file is not generated within spring-boot application that is using embedded tomcat.
How about localhost.log file? Does the same apply for localhost.log file?
Also how can I change the log levels for embedded tomcat through logback/slf4j binding in my spring-boot application.
Any advice?

Answer 1

You have to configure the tomcat container in spring boot manually like this
You have to create the bean of EmbeddedServletContainerFactory and configure the log in tomcat container , below are the sample code (I am not tested it , but it may be run).
The tomcat now search the logback-access.xml file in classpath automatically the configure the logging
For Spring boot version < 2.0.0
#SpringBootApplication
public class ABCApplication {
#Bean
public EmbeddedServletContainerFactory servletContainer() {
TomcatEmbeddedServletContainerFactory tomcat = new TomcatEmbeddedServletContainerFactory();
LogbackValve logbackValve = new LogbackValve();
logbackValve.setFilename("logback-access.xml");
tomcat.addContextValves(logbackValve);
return tomcat;
}
public static void main(String[] args) {
SpringApplication.run(ABCApplication.class, args);
}
}
The EmbeddedServletContainerFactory is replace by TomcatServletWebServerFactory is spring boot version 2.0.0 , so use required factory to configure the tomacat.
Now you can provide your logback-access.xml like this
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%h %l %u %t "%r" %s %b</pattern>
</encoder>
</appender>
<appender-ref ref="STDOUT" />
</configuration>
You can add the appender to xml to log the tomcat logging in file.
You have to look about LogbackValve
You have to add the following dependency for the LogbackValve
<dependency>
<groupId>net.rakugakibox.spring.boot</groupId>
<artifactId>logback-access-spring-boot-starter</artifactId>
</dependency>
Hope it may be help jagamot !

Answer 2

To define Embedded Tomcat Log Path add these line in application.properties
server.tomcat.accesslog.directory=logs # Directory in which log files are created. Can be absolute or relative to the Tomcat base dir.
server.tomcat.accesslog.enabled=false # Enable access log.
server.tomcat.accesslog.file-date-format=.yyyy-MM-dd # Date format to place in the log file name.
for configuring log levels for embedded tomcat through logback
use this link
https://dzone.com/articles/configuring-logback-with-spring-boot

Answer 3

1.add logging.config=classpath:logback.xml logging.path=${your log path}in your "application.properties".
create a "logback.xml" config file in your classpath(please search the contents of the configuration file by yourself).
You can already create a log file by the above two steps,If you launch your application via the "java -jar" command, you may also need the "-Djava.io.tmpdir=${your log path}"(same as "logging.path" config) parameter to specify the log storage path.