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Debugging the “Fatal error compiling: invalid target release: 11” issue. How to switch your development environment and IntelliJ settings to Java 11

2nd January 20193rd January 2019 little_pineconeTools

When updating to Java 11 from an older version of the language, make sure that your development environment is up to date. Otherwise you will receive the “Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile (default-compile) on project: Fatal error compiling: invalid target release: 11” error while building a project with Maven. Follow the checklist in this post to adjust the required settings for building a Spring Boot application.

Keycloak with Spring Boot #4 – Simple guide for roles and authorities

27th February 202225th March 2022 little_pineconeSpring Boot

Delegating user management to Keycloak allows us to better focus on meeting the business needs of an application. However, we still need to provide the appropriate configuration to translate user roles and privileges between Keycloak and Spring Boot. Additionally, we’re going to need some handy techniques for debugging how roles are converted between the two services.

Keycloak with Spring Boot #3 – How to authorize requests in Swagger UI

24th February 202223rd March 2022 little_pineconeSpring Boot

Swagger offers various methods to authorize requests to our Keycloak secured API. I’ll show you how to implement the recommended grant types and why certain flows are advised against in the OAuth 2.0 specification.

Keycloak with Spring Boot #1 – Configure Spring Security with Keycloak

24th February 202224th February 2022 little_pineconeSpring Boot

Keycloak provides simple integration with Spring applications. As a result, we can easily configure our Spring Boot API security to delegate authentication and authorization to a Keycloak server.

How to add X-XSRF-TOKEN header to Postman requests

5th February 20226th February 2022 little_pineconeTools

When an API is secured against CSRF attacks, we must ensure that our clients’ requests are adjusted to the security requirements. Learn how to successfully call an API that uses the Cookie-to-header token approach by adding the X-XSRF-TOKEN header to Postman requests.

12 reasons for using a random data generator – introducing Dummy4j

24th December 202027th December 2020 little_pineconeJava, Tools

Having a sufficient sample of lifelike data greatly improves the application development process. In most cases, when we start working on a project, we don’t have the luxury of having a well-stocked database we could use in development and testing. However, we can easily create such a database using a random data generator.

How to find and diagnose unassigned Elasticsearch shards

30th October 20201st November 2020 little_pineconeTools

Identifying the unassigned shards in Elasticsearch and finding the reason why a shard can’t be allocated is critical when we want to get rid of the “NoShardAvailableActionException: No shard available” warning. Additionally, the Elasticsearch APIs also provide helpful hints pointing to the possible cause of this issue.

Angular logs the “not a known element” error as a warning

20th October 202020th October 2020 little_pineconeAngular

In Angular 9 and 10 we can notice that the “my-element is not a known element” error is missing when our tests don’t have all required stubs. Make sure to check debug messages when running tests and add all absent stubs. Otherwise, you will have to update your test suite when the Angular team fixes this bug.

How to permanently set JAVA_HOME on Ubuntu

1st October 202017th October 2020 little_pineconeJava

If a project needs the JAVA_HOME variable pointing to a particular value and this requirement is not met on our environment, we will get errors while trying to build that project, e.g. the “Unable to find javadoc command: The environment variable JAVA_HOME is not correctly set” error. Instead of exporting the JAVA_HOME value manually we can easily set the variable permanently with a custom script.

Fix “Invalid CSRF token” error – add the XSRF-TOKEN header in Angular

3rd August 20203rd August 2020 little_pineconeAngular

Angular provides a built-in support for sending requests secured with the XSRF-TOKEN header. However, it won’t add the token to absolute URLs for security reasons. One way to solve the “Invalid CSRF token found” issue is to use relative links in all mutable requests and apply a custom proxy.