Considering the case when a call to a web service with Spring RestTemplate return an error response and we want to handle this error as a Java object. RestTemplate error responses can be handled implementing the class ResponseErrorHandler. Considering a JSON response error like the following lets see how to transform it in a This […]
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This article shows how to use Springs RestTemplate to consume a RESTful Service secured with Basic Authentication. Since Spring 5.1.1 BasicAuthenticationInterceptor has been introduced for Basic Authentication. Code above will automatically add Authorization: Basic dXNlcm5hbWU6cGFzc3dvcmQ= header.
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In this article we can see an of usage of Spring caching where the key of a cache entry is a concatenation of values and where a bean reference us used. Configuration class with bean declaration for CacheManager and referecend bean passwordEncoder. A spring bean where method authenticate is annotated with @Cacheable. With this key […]
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The property sources that are added to you application by the bootstrap context are often “remote” (e.g. from a Config Server), and by default they cannot be overridden locally, except on the command line. If you want to allow your applications to override the remote properties with their own system properties or config files, the […]
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In some cases, you may want to fail startup of a Spring Boot application if it cannot connect to the Config Server. You can do that setting the bootstrap configuration property spring.cloud.config.fail-fast=true. In this way the client startup halt with an Exception. Config server may occasionally be unavailable when your application starts, you can make […]
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If you find you are repeatedly using the same attributes with @Transactional on many different methods, then Spring’s meta-annotation support allows you to define custom shortcut annotations for your specific use cases. For example, defining the following annotations: allows us to write the example from the previous section as As you can see meta-annotations can […]
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Sometimes it can be usefull inject the Spring context in a legacy Servlet in order to automatically inject spring beans via @Autowired annotation. This can be easily done overriding the init method of HttpServlet and putting the statement SpringBeanAutowiringSupport.processInjectionBasedOnCurrentContext(this) in its implementation.
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The Spring Web model-view-controller (MVC) framework is designed around a DispatcherServlet that dispatches requests to handlers, with configurable handler mappings, view resolution, locale, time zone and theme resolution as well as support for uploading files. The default handler is based on the @Controller and @RequestMapping annotations, offering a wide range of flexible handling methods. With […]
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