aspects | 易学教程

IntelliJ IDEA + AspectJ

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问题 I am trying to use AspectJ in sample project in IntelliJ IDEA. I have an experience with Spring AOP, but this is first time I am using AspectJ, and cannot make it work. I am trying to do as described here: https://www.jetbrains.com/help/idea/2017.1/aspectj.html My build.gradle: apply plugin: 'java' repositories { mavenCentral() } dependencies { compile "org.projectlombok:lombok:+" compile "org.aspectj:aspectjrt:+" compile "org.aspectj:aspectjweaver:+" compile "org.aspectj:aspectjtools:+" }

IntelliJ IDEA + AspectJ

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JPA and database Flex fields

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问题 'Flex fields' is a term for altering a table at the customer site to add extra columns to a table to hold custom pieces of information about that table's entity. I was wondering if anyone has dealt with supporting this mechanism with jpa, specifically eclipselink. We wish to do this because we allow filtering of the base rows based on values in these customer specified fields, and having these fields in an association table causes multiple alias joins to this auxilliary table. An obvious

Autocompletion in Eclipse for Roo project

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问题 I've got a Roo project where I've made a couple of entities, and when I load up the project in Eclipse it loads up fine, but if I i.e. make an instance MyEntity entity and then write entity. I don't get any of my properties (i.e. getMyField) in the autocompletion list. If I write entity.getMyField() it compiles fine, that is taken care of by the aspects. How do I enable autocompletion for functions generated by the aspects? Cheers Nik 回答1: Which "type" of eclipse are you using? Do you have

Interceptors vs Aspects in Spring?

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问题 I am trying to use interceptors in Spring. I want to implement an interceptor on some methods to handle specific logic when these methods are called. I also want to be apart from using web framework, as am tending to use Spring as back end, without any headers. After searching, I think spring approach is called Aspects, could you please mention best practice to do this? 回答1: In Spring there are two different constructs that get called "interceptors". First, there are Handler Interceptors,

How to intercept method which handles its own exceptions using AspectJ

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问题 I'm trying add some monitoring when some specific exception occurs. For example, if I have an aspect like this: @Aspect public class LogAspect { @AfterThrowing(value = "execution(* *(..))", throwing = "e") public void log(JoinPoint joinPoint, Throwable e){ System.out.println("Some logging stuff"); } } And test class: public class Example { public void divideByZeroWithCatch(){ try{ int a = 5/0; } catch (ArithmeticException e){ System.out.println("Can not divide by zero"); } } public void

Use Spring @Transactional in Scala

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问题 We have a mixed Java and Scala project, which uses Spring transaction management. We are using the Spring aspects to weave the files with @Transactional annotated methods. The problem is, that the Scala classes aren't woven with the Spring transaction aspects. How can I configure Spring to regard the transaction in Scala? 回答1: Spring needs your transaction boundary to begin with Spring-managed beans, so this precludes @Transactional Scala classes. It sounds like the simple solution is to make

Replace Property Getter/Setter with Reflection or similar (no 3rd party libraries) in c#

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问题 I've got a property contained in a class for example public class Greeter { private Hashtable _data; public string HelloPhrase { get; set; } public Greeter(data) { _data = data; } } What I would like to do is add an Attribute to the HelloPhrase property, like this [MyCustomAttribute("Hello_Phrase")] public string SayHello { get; set; } Such that during the constructor I can reflect over the Properties in the Class(Greeter) where MyCustomAttribute has been defined and set the Get/Set methods

Why does the serialVersionUID field exist?

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问题 It has baffled me from the launch of the Serializable interface why I have to incorporate this field in all of my classes. I understand that this interface needs a unique identifier to mark the class but why cant they generate this at run-time. For instance they could generate it using an MD5 hash of the fully-qualified class name or a similar methodology used to handle duplicates in their rare occurrence (Which is, I'm sure, what eclipse does when asked to generate the id anyway). So what I

JPA and database Flex fields

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'Flex fields' is a term for altering a table at the customer site to add extra columns to a table to hold custom pieces of information about that table's entity. I was wondering if anyone has dealt with supporting this mechanism with jpa, specifically eclipselink. We wish to do this because we allow filtering of the base rows based on values in these customer specified fields, and having these fields in an association table causes multiple alias joins to this auxilliary table. An obvious approach (at least it would seem to me) would be to define an aspect(s) that injects the new fields into