Java

Using com.graphql-java-kickstart:graphql-spring-boot-starter:14.1.0 I was refactoring some code to switch Strings for enums and I got the following error. Caused by: graphql.kickstart.tools.SchemaError: Type 'Integration' is declared as an enum in the GraphQL schema but is not a Java enum! I double checked, and Integration was in the GraphQL correctly, and was also a proper Java enum. GraphQL: enum Integration { STRIPE } input IntegrationCriteria { integration: Integration identifier: String } Java enum:...

TL;DR spring: jpa: generate-ddl: true properties: javax: persistence: schema-generation: database: action: drop-and-create create-source: script-then-metadata create-script-source: init.sql init.sql CREATE ALIAS IF NOT EXISTS H2GIS_SPATIAL FOR "org.h2gis.functions.factory.H2GISFunctions.load"; CALL H2GIS_SPATIAL(); CREATE DOMAIN POINT AS GEOMETRY(POINT); CREATE DOMAIN POLYGON AS GEOMETRY(POLYGON);

I’ve been developing with Hibernate since approximately 2005. In that time I’ve spoken with many other experienced developers and compared notes on how they use and don’t use Hibernate. This is a brief summary of some key learnings. Many of the topics discussed here could be considered defects, and in a lot of cases there are tickets, but I haven’t compiled a list here. Some may have actually been fixed (please let me know), but as far as I know this is accurate as of Hibernate 5....

TL;DR In Spring CSRF generates a new token for each new session. If you have http.sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS) then there is a new session triggered for each request. This means we need a different mechanism to calculate the CSRF token, otherwise it’ll be rotated with every request, and you’ll end up with a race condition where your UI will have its token changed mid-request (at least in Angular 12). The solution here is to derive a hash from the SSO session....

TL;DR The classes that publish the AuditEvent object are instantiated by AuditAutoConfiguration which is conditional on an AuditEventRepository. If you don’t want to store the events, e.g., in an InMemoryAuditEventRepository, then you need to either: 1) manually instantiate AuthenticationAuditListener and AuthorizationAuditListener, or 2) listen for AbstractAuthorizationEvent and build up from there. The Slightly Longer Version There are a lot of articles on the web about how you can get Spring Security audit events simply by including the spring-boot-starter-actuator artifact, and then creating a listener....

TL;DR I’ve built many applications that have used ModelMapper for projecting from one object structure to another, and it has been very good for getting up and running quickly. However, it costs in terms of type safety, and startup performance. So, I’ve switched to a type safe, compile time alternative MapStruct. This article mainly covers the pros and cons of each framework, not how to use them in real projects, or best practises....

When it comes to building a SOAP web services client using Spring, the guide suggests using an Ant based gradle build task to generate the required classes. However, if you are using Jib to produce a Docker container, you may find that the generated classes are not in the container, and there are few guides as to how to get them in there. It looks something like this: ... task genJaxb { ext....

In the Java world, one of the options you have for generating PDFs is Flying Saucer. It is quite a nice solution that renders HTML to, amongst other things, PDF. In its simplest form a report, receipt, etc, could just be a chunk of text. But, more realistic situations would require images to be embedded in the output, be these logos, charts, images, etc. A commonly found suggestion for achieving this is to link to the assets via the file-system....

Starting with a project using Spring Boot 1.5.8 and Hibernate 5.2.12 I implemented Liquibase to handle database schema changes. This is all straight forward enough, with plenty of other tutorials of how to setup the runtime side. The schema diff generation side was another matter. The issues hit was that the identifier names were not correct - Spring Boot would produce underscore versions of names, e.g., my_table, while Liquibase would produce names as per the class or field name, e....

This post involves a slightly edge case scenario that I encountered a couple of months ago, so hopefully I get all the details right the first time. Essentially, I had a JPA2 project using Hibernate 3.6.10 as the ORM. This project had a requirement of some native SQL being used for dynamic table creation, so to achieve this I would call Query q = em.createNativeQuery(sql); and the proceed to call q....