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Graph/7f146fa8-74a3-4618-b5a3-529855d143f9

Domainunvalidated

Constructor Binding

7f146fa8-74a3-4618-b5a3-529855d143f9

Constructor Binding

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Updated5/1/2026

PageRank0.0001

Effectiveness0.000

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10 linked nodes

PERTAIN_TOProblem

the below post request is failing with the below exception — Spring Boot 4 project with the below controller and DTO.

PERTAIN_TOSolution

Spring Boot 4 introduced some major changes where, by default, it uses Jackson 3 instead of Jackson 2. Outcome: making it a more suitable candidate over the no-arg counterpart.

PERTAIN_TOProblem

After migrating from field injection to constructor-based injection, Spring throws a BeanCreationException when instantiating `exampleCommand` because it cannot resolve a constructor parameter for the DTO passed via `beanFactory.getBean(Command.class, inputDto)`.

PERTAIN_TOSolution

Do not expect the DTO to be injected into the command via constructor autowiring; instead, configure the command as a plain class and inject a provider/factory (e.g., a bean or functional interface) that accepts the DTO, or otherwise supply the DTO through a non-autowired step/setter after bean creation.

PERTAIN_TOProblem

it throws me an odd error: — spring.ai.openai.model=gpt-3.5-turbo. Tension: Why is it automatically assumed I need gpt4o? There are no references of gpt4o anywhere in the code.

PERTAIN_TOSolution

Replace — spring.ai.openai.model=gpt-3.5-turbo. Outcome: spring.ai.openai.chat.options.model=gpt-3.5-turbo.

PERTAIN_TOProblem

the application fails to start because `field2` is null instead of `Optional.empty()` — loading configuration in spring-boot. Tension: Binding to target TenantsConfiguration failed: Property: pfx.tenants.t1.field2. Outcome: I tried converting TenantConfiguration to a record, but that did not change anything.

PERTAIN_TOSolution

So a work around for your problem would be : — @ConstructorBinding public TenantConfiguration(String field1, String field2). Tension: normal null -> Optional conversion when I'm loading configuration in spring-boot. Outcome: this.field1 = Optional.ofNullable(field1);.

PERTAIN_TOProblem

The `MdcConfig` fields are bound correctly, but `SomeClass` sees `mdcConfig` as null and/or its derived field `mdcAllowedItems` ends up null. Breakpoints show `MdcConfig` setters are called, yet `SomeClass` initialization reads before injection.

PERTAIN_TOSolution

Move initialization of `mdcAllowedItems` to `@PostConstruct`, or refactor to constructor injection (make `mdcConfig` final) and initialize `mdcAllowedItems` in the constructor after `mdcConfig` is injected.

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