Locked. This question and its answers are locked because the question is off-topic but has historical significance. It is not currently accepting new answers or interactions. What are the best practices for using Java’s @Override annotation and why? It seems like it would be overkill to mark every single overridden method with the @Override annotation. … Read more
Should you place the @Transactional in the DAO classes and/or their methods or is it better to annotate the Service classes which are calling using the DAO objects? Or does it make sense to annotate both “layers”? 19 s 19 I think transactions belong on the service layer. It’s the one that knows about units … Read more
I understand that @Component annotation was introduced in spring 2.5 in order to get rid of xml bean definition by using classpath scanning. @Bean was introduced in spring 3.0 and can be used with @Configuration in order to fully get rid of xml file and use java config instead. Would it have been possible to … Read more
I’m learning Spring 3 and I don’t seem to grasp the functionality behind <context:annotation-config> and <context:component-scan>. From what I’ve read they seem to handle different annotations (@Required, @Autowired etc vs @Component, @Repository, @Service etc), but also from what I’ve read they register the same bean post processor classes. To confuse me even more, there is … Read more
I’ve recently noticed something interesting when looking at Python 3.3 grammar specification: funcdef: ‘def’ NAME parameters [‘->’ test] ‘:’ suite The optional ‘arrow’ block was absent in Python 2 and I couldn’t find any information regarding its meaning in Python 3. It turns out this is correct Python and it’s accepted by the interpreter: def … Read more
I’m looking to make my code more readable as well as use tooling like IDE code inspection and/or static code analysis (FindBugs and Sonar) to avoid NullPointerExceptions. Many of the tools seem incompatible with each others’ @NotNull/@NonNull/@Nonnull annotation and listing all of them in my code would be terrible to read. Any suggestions of which … Read more
Can @Component, @Repository and @Service annotations be used interchangeably in Spring or do they provide any particular functionality besides acting as a notation device? In other words, if I have a Service class and I change the annotation from @Service to @Component, will it still behave the same way? Or does the annotation also influence … Read more
Use it every time you override a method for two benefits. Do it so that you can take advantage of the compiler checking to make sure you actually are overriding a method when you think you are. This way, if you make a common mistake of misspelling a method name or not correctly matching the … Read more
@Autowired – No qualifying bean of type found for dependency
Exactly how to do this depends on the version of Jackson that you’re using. This changed around version 1.9, before that, you could do this by adding @JsonIgnore to the getter. Which you’ve tried: Add @JsonIgnore on the getter method only Do this, and also add a specific @JsonProperty annotation for your JSON “password” field name to the setter method for the … Read more
