Starting on Spring Boot 2.6, circular dependencies are prohibited by default. you can allow circular references again by setting the following property: spring.main.allow-circular-references = true You can read some more details about this in the Spring Boot 2.6 Release Notes.
You can’t usually invalidate a user session(s) immediately you change their account information without resorting to a container specific API, since the only way to access the HttpSession is through the HttpServletRequest object. Instead you can cache the username in an in-memory store and consult it either in a filter or a custom AccessDecisionVoter. Using … Read more
You could use th:method for this: <form th:object=”${commandObject}” th:action=”@{/urlToCall}” th:method=”delete”> This will generate a hidden input element, which will be picked up by Spring MVC: <input type=”hidden” name=”_method” value=”delete”>
The problem with showing user-friendly messages in the case of constraint violation is that the constraint name is lost when Hibernate’s ConstraintViolationException is being translated into Spring’s DataIntegrityViolationException. However, you can customize this translation logic. If you use LocalSessionFactoryBean to access Hibernate, you can supply it with a custom SQLExceptionTranslator (see LocalSessionFactoryBean.jdbcExceptionTranslator). This exception translator … Read more
A callback is a piece of code that you pass as an argument to some other code so that it executes it. Since Java doesn’t yet support function pointers, they are implemented as Command objects. Something like public class Test { public static void main(String[] args) throws Exception { new Test().doWork(new Callback() { // implementing … Read more
First thing you need to understand Cors configuration is added in the backend. You do not need to send cors header with each request from Angular2 App. Understanding that, this problem is easily fixed by adding global CORS configuration in your spring security configuration class. First you need to create a filter bean : @Component … Read more
Spring MVC already provides a mechanism for distinguishing between json and html, the RequestMapping annotation takes a consumes attribute which looks at the content type of the request… // REST version, Content-type is “application/json” @RequestMapping(value = “https://stackoverflow.com/”, consumes = “application/json”) public void myRestService() { … // HTML version, Content-type is not “application/json” @RequestMapping(value = “https://stackoverflow.com/”, … Read more
Thanks a lot guys for your valuable comments. You are all right. Jar files must be in WEB-INF/lib. Or you can tell Eclipse that it can find the jars in additional location and not just WEB-INF/lib. How do we do that? Right click the project and select properties. Now go to Deployment Assembly. Now select … Read more
Simply create a Pojo Java Bean with fields with names that match your request parameters. Then use this class as an argument for your request handler method (without any additional annotations) public class Example { private String x; private Integer y; //Constructor without parameter needed! public Example(){} //Getter + Setter } @Controller @RequestMapping(“someUrl”) public class … Read more