Logger on Micha Kops' Tech Notes

Logback and Spring Boot - Change Log Level to custom format

Thu, 19 Aug 2021 00:00:00 +0200

Create a custom converter

This class converts the well known log levels to a custom format

CustomLogLevelConverter.java

package com.hascode;

public class CustomLogLevelConverter extends ClassicConverter {
    @Override
    public String convert(ILoggingEvent event) {
        switch (event.getLevel().toInt()) {
            case Level.ERROR_INT:
                return "ERROR!!!";
            case Level.WARN_INT:
                return "WARN!!";
            case Level.INFO_INT:
                return "INFO!";
            case Level.TRACE_INT:
                return "DEBUG";
            default:
                return event.getLevel().toString();
        }
    }
}

Register the converter

The following Logback config includes some defaults and registers our custom converter.

Eclipse Snippets

Mon, 01 Mar 2010 00:00:00 +0100

Favorites

Spare my time when using static imports ..

Window > Preferences > Java > Editor > Content Assist > Favorites:

com.google.common.collect.Lists
com.jayway.restassured.matcher.RestAssuredMatchers
com.jayway.restassured.RestAssured
io.restassured.matcher.RestAssuredMatchers
io.restassured.RestAssured
org.hamcrest.MatcherAssert
org.hamcrest.Matchers
org.mockito.Mockito
javaslang.API
javaslang.Predicates

Template to insert a static logger instance

Go Windows > Preferences > Java > Editor > Templates > New …

Enter logger as name and as template:

${:import(org.slf4j.Logger,org.slf4j.LoggerFactory)}
private static final Logger LOG = LoggerFactory.getLogger(${enclosing_type}.class);

Afterwards you’re able to type logger in your code and ctrl+space gives the option to insert the logger

IntelliJ Snippets

Mon, 01 Mar 2010 00:00:00 +0100

Live Templates

JUnit 5 Test

@org.junit.jupiter.api.Test

@org.junit.jupiter.api.DisplayName("$NAME$")

void $METHOD$() throws Exception {

    $END$

}

Figure 1. IntelliJ Live Template Editor

Edit Variables:

NAME
METHOD: default-value camelCase(NAME)

Figure 2. Editing template variables

SLF4J Logger Template

private static final org.slf4j.Logger log = org.slf4j.LoggerFactory.getLogger( $CLASS$.class );

Edit variables:

CLASS: expression: className()

Favorite Shortcuts

Select whole block in Editor

Cmd+Tab+Down

Select similar blocks in editor

Ctrl+G

Copy the absolute Path of the current File into Clipboard

Cmd+Shift+C

Spring Boot Snippets

Mon, 01 Mar 2010 00:00:00 +0100

Define and Configure Log Groups

This allows to configure a group of loggers at the same time

Define a log group named myaspect with two packages
application.properties
```
logging.group.myaspect=com.hascode.package1,com.hascode.package2
```
Configure the log group and set all loggers to level TRACE
application.properties
```
logging.level.myaspect=TRACE
```

This is also possible as parameter on startup

java -Dlogging.level.myaspect=TRACE myapp.jar

Use JUnit 5 with Spring Boot

Use newer versions of Surefire and Failsafe plugins:

<properties>
[..]
  <maven-failsafe-plugin.version>2.22.0</maven-failsafe-plugin.version>
  <maven-surefire-plugin.version>2.22.0</maven-surefire-plugin.version>
</properties>