Null value for Optional type
Reports null assigned to an Optional variable or returned from a method returning Optional.
It's recommended that you use Optional.empty() (or Optional.absent() for Guava) to denote an empty value.
Example:
After the quick-fix is applied:
Locating this inspection
- By ID
Can be used to locate inspection in e.g. Qodana configuration files, where you can quickly enable or disable it, or adjust its settings.
OptionalAssignedToNull- Via Settings dialog
Path to the inspection settings via IntelliJ Platform IDE Settings dialog, when you need to adjust inspection settings directly from your IDE.
Configure the inspection:
Use the Report comparison of Optional with null option to also report comparisons like optional == null. While in rare cases (e.g. lazily initialized optional field) this might be correct, optional variable is usually never null, and probably optional.isPresent() was intended.
New in 2017.2
This inspection depends on the Java feature 'Stream and Optional API', which is available since Java 8.
Inspection options
Here you can find the description of settings available for the Null value for Optional type inspection, and the reference of their default values.
- Report comparison of Optional with null
Default value:
Selected
Suppressing Inspection
You can suppress this inspection by placing the following comment marker before the code fragment where you no longer want messages from this inspection to appear:
More detailed instructions as well as other ways and options that you have can be found in the product documentation:
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By default bundled with: |