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Graph/5428dec3-f09a-47e8-a1b4-e8ea1ade04c3

Domainunvalidated

Nullability

5428dec3-f09a-47e8-a1b4-e8ea1ade04c3

Nullability

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Updated5/1/2026

PageRank0.0000

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14 linked nodes

PERTAIN_TOSolution

Use separate entities with one-to-one relations instead of trying to create PersonExtra and PersonBasic with the same primary key

PERTAIN_TOProblem

The Sonar message is: A "NullPointerException" could be thrown; "ofNullable()" can return null. (rule java:S2259) — return Optional.ofNullable(string).map(String::toLowerCase).orElse(null);. Tension: May be I'm wrong, but Optional.ofNullable can't return null. Outcome: It's a bug of SonarQube.

PERTAIN_TOSolution

Use `@Nullable` on the `toLowerCaseNullSafe`. — public static String toLowerCaseNullSafe(@Nullable String string). Tension: Optional.ofNullable(string).map(String::toLowerCase).orElse(null). Outcome: return string == null ? null : string.toLowerCase();.

PERTAIN_TOAnswer

PERTAIN_TOProblem

I am getting this error. Tension: which should set the instance fields in each Manager and Employee object to 0 and 1, respectively. Outcome: There is no such thing as "variable overriding" in Java.

PERTAIN_TOSolution

In short, drop the `Manager.salary` member, and you should be fine:. Tension: since Java 5, the `Comparable` interface has been made generic. Outcome: You can save some casting boilerplate (and gain some compile-time safety) by defining your `Employee` as `Comparable`:.

PERTAIN_TOAnswer

PERTAIN_TOProblem

Either the RfidTag will also get deleted (which I do not want) or I get an error like: org.hibernate.TransientObjectException — If I delete a Person that has an RfidTag. Tension: the assigned RfidTag should not get deleted, it should remain in the database, but the value for person_id should be set to NULL.

PERTAIN_TOAnswer

PERTAIN_TOSolution

Tension: this will only limit this at. Outcome: You will need to do validation in the form/model.

PERTAIN_TOSolution

Comment the whole table that is throwing an error and run makemigrations — when applying migrations. Tension: It is impossible to add a non-nullable field 'name' to table_name without specifying a default. Outcome: which will remove that table from migrations. Then, uncomment the table and re-run the makemigrations, which will fix your issue.

PERTAIN_TOProblem

It is impossible to add a non-nullable field 'name' to table_name without specifying a default. — when applying migrations. Tension: the database needs something to populate existing rows.

PERTAIN_TOAnswer

PERTAIN_TOAnswer

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