Why do we have @Nullable and @NotNull annotation?

Why do we have @Nullable and @NotNull annotation?

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Nullability Annotations
Nullability Annotations
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Nullability Annotations

Nullability Annotations
Hibernate Tip: Difference between @NotNull and @Column(nullable = false)

Hibernate Tip: Difference between @NotNull and @Column(nullable = false)
Kotlin requireNotNull - Forcing something that is nullable to be not null

Kotlin requireNotNull - Forcing something that is nullable to be not null
Hibernate Tip: Validate that only 1 of 2 associations is not null

Hibernate Tip: Validate that only 1 of 2 associations is not null
Java :How to use @Nullable and @Nonnull annotations more effectively?(5solution)

Java :How to use @Nullable and @Nonnull annotations more effectively?(5solution)
How to use NonNull Annotation in Lombok

How to use NonNull Annotation in Lombok
How to use checkNotNull in Kotlin

How to use checkNotNull in Kotlin
Java :Confusion: @NotNull vs. @Column(nullable = false) with JPA and Hibernate(5solution)

Java :Confusion: @NotNull vs. @Column(nullable = false) with JPA and Hibernate(5solution)
Java Optional Explained

Java Optional Explained
IntelliJ Warning: Not Annotated Parameter Overrides @NotNull Parameter Without Disabling Inspections

IntelliJ Warning: Not Annotated Parameter Overrides @NotNull Parameter Without Disabling Inspections
Demonstration - JetBrains Annotations Nullability

Demonstration - JetBrains Annotations Nullability
How to Resolve NULL Insert Error in Spring Boot and Thymeleaf Application?

How to Resolve NULL Insert Error in Spring Boot and Thymeleaf Application?
Avoiding Null Checks in Java: Best Practices and Strategies

Avoiding Null Checks in Java: Best Practices and Strategies
Java :@Nullable annotation usage(5solution)

Java :@Nullable annotation usage(5solution)
Java :Which @NotNull Java annotation should I use?(5solution)

Java :Which @NotNull Java annotation should I use?(5solution)
#13 @JsonInclude annotation: To skip null fields and only include non null fields in request body

#13 @JsonInclude annotation: To skip null fields and only include non null fields in request body