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Spring Boot 3 and Keycloak with Oauth2 Resource Server (JWT) for REST...
IntroductionSpring Security OAuth2 Login does NOT support authentication with Access Token that you might first think....
View ArticleSpring Boot 3 and Keycloak with Oauth2 Log in (Authorization Code Grant) for...
IntroductionSee https://magnus-k-karlsson.blogspot.com/2023/08/spring-boot-3-spring-security-6.htmlPrerequisiteJava 17Maven 3.6.3 or laterSpring 3.1.2Spring Security 6.1.2Keycloak. I will use the...
View ArticleSpring Boot 3 and Keycloak with Oauth2 Log in (Authorization Code Grant) for...
IntroductionSee Spring Boot 3 and Keycloak with Oauth2 Log in (Authorization Code Grant) for Angular SPASee Spring Boot 3 and Keycloak with Oauth2 Resource Server (JWT) for REST integrationHere we will...
View ArticleSpring Boot 3 and Keycloak with Oauth2 Log in (Authorization Code Grant) and...
IntroductionUsing BASIC authentication when requesting Access Token in OAUth 2 Authorization Code Flow is not the safest way. Especially if this password is rarely changed.See Spring Boot 3 and...
View ArticleOauth 2.0 Client Credentials Grant
Used for machine-to-machine communicationClient needs to hold secrets, since Access Token is directly exposedhttps://datatracker.ietf.org/doc/html/rfc6749#section-4.4.2 POST /token HTTP/1.1 Host:...
View ArticleSpring Boot 3 with Basic Authentication and JDBC Password Storage
Create new Maven ProjectCreate new project with Spring Initializr (https://start.spring.io/) and add dependency: Spring Data JDBC and MySQL<dependency>...
View ArticleUsing Java 17 keytool as Root CA to create Server and User Certificate
Referencehttps://docs.oracle.com/en/java/javase/17/docs/specs/man/keytool.htmlhttps://magnus-k-karlsson.blogspot.com/2020/02/x509-certificate-profiles.htmlRoot CAGenerate Self Signed Root CA$ keytool...
View ArticleSpring Boot 3 with X509 Authentication and JDBC Storage
Referencehttps://docs.spring.io/spring-security/reference/servlet/authentication/x509.htmlhttps://magnus-k-karlsson.blogspot.com/2023/08/using-java-17-keytool-as-root-ca-to.htmlhttps://magnus-k-karlsso...
View ArticleOpenLDAP Image and Custom LDIF with User and Group
Reference: https://hub.docker.com/r/bitnami/openldapLDAP_PORT_NUMBER: The port OpenLDAP is listening for requests. Priviledged port is supported (e.g. 1389). Default: 1389 (non privileged port)....
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Keycloak, User Federation from LDAP and Lesson Learned
LDAPWe are going to use OpenLDAP and setup in previous blog OpenLDAP Image and Custom LDIF with User and Group.$ podman run -d --name openldap \ -e LDAP_ROOT=dc=magnuskkarlsson,dc=se \ -e...
View ArticleSpring RestTemplate and WebClient Improvements
Improvements for reactive WebClienthttps://medium.com/@dixitsatish34/how-to-improve-webclient-response-time-in-spring-boot-3c0c898f06b4Improvements for blocking...
View ArticleIPv4 Network Ranges
Example 192.168.0.0/30number of IP addresses = 2 ^ (32–30)which is 2 ^ 2 = 4The IP addresses are thus 192.168.0.0, 192.168.0.1, 192.168.0.2 and 192.168.0.3Example 192.168.0.0/29number of IP addresses =...
View ArticleCORS Finally Explained — Simply
https://levelup.gitconnected.com/cors-finally-explained-simply-ae42b52a70a3
View ArticleInstallation of HAProxy and Keepalived for High Availability
https://medium.com/@kemalozz/installation-of-haproxy-and-keepalived-for-high-availability-f1d6e7b8982a
View ArticleDifferences between Load Balancer, Reverse Proxy and API Gateway
https://medium.com/codenx/load-balancer-vs-reverse-proxy-vs-api-gateway-fcb79912abbf
View ArticleGeneric Exception Handling in Spring Boot
https://blog.stackademic.com/top-10-ways-to-handle-exception-in-springboot-with-coding-examples-ac27fad937ca
View ArticleSwagger Like a Pro with Spring Boot 3 and Java 17
https://medium.com/@berktorun.dev/swagger-like-a-pro-with-spring-boot-3-and-java-17-49eed0ce1d2f
View ArticleMastering Exception Handling in Spring Boot: A Comprehensive Guide
https://naveen-metta.medium.com/mastering-exception-handling-in-spring-boot-a-comprehensive-guide-fa3f916d1981
View ArticleMastering Lombok in Spring Boot for Efficient Java Development
https://medium.com/@tecnicorabi/mastering-lombok-in-spring-boot-for-efficient-java-development-8f79828c0519
View ArticleConfigure mTLS/Two-Way SSL/Client Certificate Authentication with Spring Boot...
IntroductionIn this blog I'm configure mTLS also called Two-Way SSL or Client Certificate Authentication, with self signed certificate.Server Certificate (self signed)$ keytool -genkeypair -alias...
View ArticleWriting mTLS/Two-Way SSL/Client Certificate Authentication with Spring Boot 4...
IntroductionIn my previous I setup the server side with mLTS https://magnus-k-karlsson.blogspot.com/2026/04/configure-mtlstwo-way-sslclient.htmlSSL Bundleapplication.properties#...
View ArticleWriting mTLS/Two-Way SSL/Client Certificate Authentication with Spring Boot...
IntroductionIn my previous I setup client certification authentication with RestClient https://magnus-k-karlsson.blogspot.com/2026/04/writing-mtlstwo-way-sslclient.htmlHere I will use new Spring Boot 4...
View ArticleHow to Install Docker CE on Fedora 43
Prerequisite$ cat /etc/os-release ... VERSION="43 (Workstation Edition)" ... Install Docker CE (Community Edition)https://docs.docker.com/engine/install/fedora/Remove possible old version of Docker CE$...
View ArticleGIT Rebase
1. Check out your main branch:$ git checkout mainReference: https://docs.gitlab.com/topics/git/git_rebase/2. "Ensure you have the latest contents of the target branch. In this example, the target...
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