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Tag: option-type

How can I unit-test Exception thrown inside a Lambda?

I have a method: This is how the user authorization test looks like: Is there any way to check the case when a user has entered the wrong password? In the case when I send the wrong password, it doesn’t work because given(this.repository.findByEmail(this.user.getEmail())).willReturn(Optional.of(this.user)); makes repository.findByEmail() return the result before you get to checking the password. Answer You don’t need this

How to deal with warning ‘unsafe null type convertion’ when using java.lang.Optional

I would like to offer some accessors to a value-container (that is a java.lang.Map under the hood). When implementing accessors like this … ‘ofNullable’ is marked with ‘unsafe null type convertion’. Why is this? The parameter ofNullable is not marked as @NonNull. Is it, because empty() or of() is used and of() is checking for NonNull? Is this a Eclipse-bug,

java 8 Optional with Map<String, Set> [closed]

Closed. This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 9 months ago. Improve this question I have a Map<String, Set> getProperties which returns {BUILDING=[a, b, c]}, {NEW_BUILDING=[a, b, c, d, e]}, {OLD_BUILDING=[d, e]}.. I want to switch between BUILDING, NEW_BUILDING

How to get value from an optional object in another optional?

Basically,I need to get a size of optional list in an optional object. Something like: The code doesn’t look nice. What’s the elegant way to get it? With ifPresent().orElse()? Thanks in advance! Answer Consecutive map (or flatMap, in case something returns an Optional) operations, and a final orElse:

How to reduce Optionals to throw an error once

I have the following response coming from a rest call and performing some logic based on what is returned. This is what I want. If the overall status code is NOT 200 OR If within the list of SimpleResponse, none of the SimpleResponse objects has a 200 httpCode, throw an error. The example below is incomplete. Too much going on

Set with Optional

I have this code: I want to replace this code to this: and map this field from myClass to myClass2 How i can do it? Answer Did you mean to use: For mapping I would suggest to read about MapStruct, it is a good tool.

Java 8 Optional: combine two possibly null object

I have to ensure if two values are non null. When the first and second have non null values, pass first as argument to second. If one of them are null value, then return false. This can be done in the following piece of code: It can also be done in short form: I was wondering how to do this

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