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PARAMETERIZEDTYPEIMPL CANNOT BE CAST TO JAVA.LANG.CLASS

The gist of the code looks something like: Thus if your method declaration looks like: While recently fiddling with some more runtime generic type extraction for Deployit , I was caught out by some unexpected behaviour by the reflection API. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies. Having said that, I can’t tell what your code is trying to do. Actually this list has values of parameters in “some” form which I am supposed to converted into required type, the required type is the type which method requires, this is for api invocation through reflection.

The actual output, however, is: Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of service , privacy policy and cookie policy , and that your continued use of the website is subject to these policies. Generic superclass type argument: If the superclass is a parameterized type, the Type object returned must accurately reflect the actual type parameters used in the source code. Sign up using Facebook. However, if we look at Class. Sign up using Email and Password.

Could you please post more code preferably with some real usage example? Sign up or log in Sign up using Google. While recently fiddling with some more runtime generic type extraction for DeployitI was caught out by some unexpected behaviour by the reflection API. Parameterizedtypekmpl using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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(reflect) (ann) Method#getAnnotation fails

When this code is run, the first two invocations of tryGetSuperclassGenericTypeParam result in the expected: So, do we have any work around for this? Microservices for Java Developers: The gist of the code looks something like:.

In this case, the issue centres on the interplay between Class. Thus if your method declaration looks like: Roll your own user auth or integrate pre-built identity management? Download the free trial. To cut a long story short: Generic superclass type argument: When this code is run, the first two invocations of tryGetSuperclassGenericTypeParam result in the expected:.

Required type is requiredClassType arguments. You can get information about actual type arguments of ParameterizedType using getActualTypeArguments method. Ergo To cut a long story short: Class cannot be cast to java. If a formal parameter type is a parameterized type, the Type object returned for it must accurately reflect the actual type parameters used in the source code.

Opinions expressed by DZone contributors are their own. Footnotes Read “I assumed” It’s a pity that Class. Returns an array of TypeVariable objects that represent the type variables declared by the generic declaration represented by this GenericDeclaration object, in declaration order. Email Required, but never shown. Returns an array of length 0 if the underlying generic declaration declares no type variables. Develop the Delivery You Want.

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Because as stated in method. In order to figure out what’s going on here, let’s have a look at the Javadoc for Class. Learn more about Kotlin. If the superclass is a parameterized type, the Type object returned must accurately reflect the actual type parameters used in the source code.

[JDK] (reflect) (ann) Method#getAnnotation fails – Java Bug System

Post as a guest Name. A check of the Javadocs quickly revealed that I had once again been too hasty in relying on “common sense”. Having said that, I can’t tell what your code is trying to do. Over a million developers have joined DZone.

Data APIs for Developers. Actually this list has values of parameters in “some” form which I am supposed to converted into required type, the required type is the type which method requires, this is for api invocation through reflection. Parameterizedtypeompl, the information returned is specific to the actual declaration of the class, which may or may not, as in our case specify type paramaters for its superclass.

It seems fairly straightforward: Example for case I described above:.