“Variable is never assigned” warning in IntelliJ IDEA can be suppressed only "partially"

Question

Java EE + IntelliJ Idea 2016.3: I've written a class and declared a private field with a @Inject annotation.

I have successfully got rid of the "unused declaration" notification from the "inspection results" window by adding javax.inject.Inject to settings -> editor -> inspections -> Java -> declaration redundancy -> unused declarations -> entry points -> annotations -> mark field as implicitly written when annotated by (based on this post).

Unfortunately the field is still underlined and a yellow marker is present on the scroll bar. Do I configure this separately or am I doing something wrong?

Ias

Show us the code, please. – Antidote

Answer 1

There are two separate warnings. One says the field was never assigned a value, which is the one you have disabled. The other says the field was never used, which is the warning you are getting.

Add Inject to settings -> editor -> inspections -> java -> declaration redundancy -> unused declarations -> entry points -> annotations -> Mark as entry point if annotated by

Otherwhere

Adding the @Inject annotation to the "mark as entry point" section instead the "mark field as implicitly written" did the job. However, before I did that the warning message was Private field 'logger' is never assigned and not never used as you said. I am using the logger field later in the code. Simultaneously the code inspector reported "No suspicious code found" - maybe it is a bug in Idea. – Ias

Also note that Alt-Enter provides menu entries to how to turn warnings off. – Terrijo

"Alt-Enter provides menu entries to how to turn warnings off" - yes, but in my idea it only directs to "unused declaration". one has to know to click into "entry points" and "annotations" – Ias

In my case, I had Spring Value annotation, and I had to add it to the subsection "Mark field as explicitly written if annotated by". – Scevour

Answer 2

Highlight the field, type Alt + Enter "Windows" or ⌥⏎ "Mac" or Just click on the Light Bulb. Select the "Suppress for fields annotated by {annotation name}.

Vicinal

I do not have this option in IDEA 2019.1.2 (Ultimate Edition). Where can I find this option now? – Hodosh

same here. With light bulb I only see other stuff (Add consturctor parameters, change access modifiert, ..) but no supression 2022.3.1 (Community Edition) – Mumps

found it, see my response below were I could add a picture: https://mcmap.net/q/1776027/-variable-is-never-assigned-warning-in-intellij-idea-can-be-suppressed-only-quot-partially-quot – Mumps

Answer 3

You can just choose to ignore it in some cases where it actually make sense,

What you can do is hover the affected area and press Alt + Enter in "Windows" or alt/option/⌥ + Enter in "Mac", and chose to suppress it.

You'll see,

Correy

I had used this in the past but totally forgot how to bring this dialogue :D. Thanks for reminding. – Strickler

I think it's kinda irritating that it says "suppress unused warning..." but it's in fact the "never assigned warning". – Pillowcase

Answer 4

It seems that it was a bug in IDEA. I've just updated to IDEA 2016.3.1 and now @Inject and @Resource annotations put in the "entry points" section do not work - they have to be put in the "fields" window (although when they are in "entry points" section I can still observe the "old" behavior i.e. annotated fields are not detected by code inspection yet they are underlined in the editor and yellow marker is visible).

Ias

Answer 5

Update 2023

I had this issue before, but the screens look different now:

• I don't have Suppress unused warning if annotated...
• Now, it is Assume fields annotated by ...@Autowired as implicitly written

The first option didn't appear. I had to select the variable name, instead of the type.

Mumps