Spring Lemon Commons Guide

Under construction ..

spring-lemon-commons is second in the Spring Lemon module hierarchy. It includes spring-lemon-exceptions and adds some common features that are useful in other modules, which are discussed below.

LemonJwsService and LemonJweService classes

Spring Lemon comes with LemonJwsService and LemonJweService, which are used for creating and parsing JWS and JWE tokens respectively. They use Nimbus JOSE + JWT under the hood.

BlueTokenService and GreenTokenService

LemonJwsService and LemonJweService aren't used directly in other Spring Lemon modules. Instead, BlueTokenService and GreenTokenService, two interfaces implemented by LemonJwsService and LemonJweService respectively, are used.

Spring Lemon uses BlueTokenService for creating/parsing authorization tokens, and GreenTokenService for creating/parsing other tokens (like forgot-password token). They are defined as beans in LemonCommonsAutoConfiguration, as below:

@Bean
@ConditionalOnMissingBean(BlueTokenService.class)
public BlueTokenService blueTokenService(LemonProperties properties) throws JOSEException {
	
    return new LemonJwsService(properties.getJwt().getSecret());
}

@Bean
@ConditionalOnMissingBean(GreenTokenService.class)
public GreenTokenService greenTokenService(LemonProperties properties) throws KeyLengthException {
	
    return new LemonJweService(properties.getJwt().getSecret());
}

Noticed the @ConditionalOnMissingBean annotation above? So, if you want to replace the implementations, just define your beans.