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Questions tagged [invocationhandler]

20 questions
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JAVA: What are the advantages of an InvocationHandler over an implementation of an Interface?

In class today, we were talking about reflection in Java programming. A part of the lesson today was about using InvocationHandlers in Java, rather than just implementing an interface. When I asked the teacher what the advantages were of using an…
KoenVE
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how to intercept static method in java

public class Test{ public static void say(String hello){ System.out.println(hello); } } Class Test has a static method 'say', how can I intercept this static method? Is there a way to work by using…
Sstx
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Dynamic Proxy: how to handle nested method calls

I'm trying to learn Dynamic Proxies in Java. I know how they work but I can't find a solution to my problem: given an interface and its implementation with methods a(), b() and c() nested one into the other (let's say a() calls b() which calls…
breathe0
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Java - Create an invocation handler?

I am trying to implement a factory class that generates objects and intercept all public methods. I am trying to invoke 2 methods here. 1:the already invoked method 2: a method in my base. Any idea how I can achieve this? public class LoggerFactory…
aryaxt
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no such element exception after using a proxy wrapper

In order to close a random pop up on my web page, I followed a tutorial of wrapping web elements with a proxy wrapper: https://www.vinsguru.com/selenium-webdriver-how-to-handle-annoying-random-popup-alerts/ After implementing this solution in my…
may
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Java 7 - custom method decoration without default delegating all, other, many methods

I'd like to decorate the interface PreparedStatement, in order to custom close it (just an example). This means that I want to decorate an existing instance of PreparedStatement, thus, invoking other code, when close() is being invoked. For that, I…
AlikElzin-kilaka
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Create a No-op InvocationHandler

I'm trying to create a no-op "listener" using Java's InvocationHandler and Proxy classes. I'm not really sure the implementation below will handle every scenario, nor whether it is the best solution. What I'd really like is for this class to have…
markshiz
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Throw Exception in Jersey ResourceMethodInvocationHandlerProvider

Based on this thread Registering a custom ResourceMethodInvocationHandler in Jersey , I was able to intercept Jersey resource method calls after unmarshalling the JSON. But how do I throw a custom exception based on some logic (Eg: Forbidden…
user1263019
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Using aspects to inject InvocationHandlers without Proxy class

I want to create a class which proxies all calls to methods to its superclass with log information (i.e. before/after statements, for example). However, the framework using this class will be loading it via the new (..) invocation, or else, via…
jayunit100
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Nested Jsr 303 validation annotations

I would like to use a class level annotation constraint. However I cannot get the inner constraints to validate automatically. I'd like to help with one part, to incorporate validation groups into this technique. @ConstraintA({ …
user1217209
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Execute InvocationHandler invoke method for each method at my proxied class

I have implement a dynamic proxy in order to do some operations before my methods started. now I have a problem when invoking two methods from the proxied class, here is the code: Dynamic proxy class: public class IPageProxy implements…
Ali Taha
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Invocation handler for Asynchronous Rest API Call

I had worked on an application with SOAP web service where all the soap api calls will be triggered through one place using handler method invocation. I've not seen the implementation in detail but I know how it was working. Can we have one class…
Shakthi
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Proxy NullPointerException for HashMap

I am trying to make a proxy between my WebApp and storage on my disk. I know everything works fine for the WebApp and it even saves stuff to the disk, so I know that the Invoke method on my InvocationHandler gets called, but the proxy itself seems…
DrRonne
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Options for "Decorating" methods in Java Static Class without using AOJ or similar

I have a static class that has a number of methods with different names but otherwise the same signature, e.g.: protected static MyResponse [validationMethodName] (MyObject target, MyStatus failStatus) throws Exception {...} I would like these…
mobiusloopy
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java annotation for runtime preprocessing on class already coded and in use

I would like to define an annotation for methods that could execute some code before the method starts. As I understand, it is possible to use proxy and invocation handler to perform this kind of task ( like for instance in : …
user3617487
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