使用Lombok @Jacksonized

Question

我无法让它工作(使用@Jacksonized)

@Value
@Builder
@Jacksonized
public class Flight {
    private String id;
    private String destination;
    private int flightTime;
    private int flightDuration;

}

使用以下设置

@RestController
public class FlightController {
    @PostMapping("/flights")
    public Flight create(@RequestBody Flight flight) {
        return Flight.builder()
                .id(UUID.randomUUID().toString())
                .destination(flight.getDestination())
                .flightTime(flight.getFlightTime())
                .flightDuration(flight.getFlightDuration())
                .build();
    }
}

这是基于spring-boot-2.6.2，它与lombok-1.18.22一起来的。我所犯的错误是

2022-01-06 01:13:01.899 DEBUG 14672 --- [nio-8080-exec-2] o.s.web.method.HandlerMethod             : Could not resolve parameter [0] in public com.trial.lombokjackson.Flight com.trial.lombokjackson.FlightController.create(com.trial.lombokjackson.Flight): Type definition error: [simple type, class com.trial.lombokjackson.Flight]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `com.trial.lombokjackson.Flight` (no Creators, like default constructor, exist): cannot deserialize from Object value (no delegate- or property-based Creator)
 at [Source: (PushbackInputStream); line: 2, column: 5]
2022-01-06 01:13:01.902 DEBUG 14672 --- [nio-8080-exec-2] o.s.web.servlet.DispatcherServlet        : Failed to complete request: org.springframework.http.converter.HttpMessageConversionException: Type definition error: [simple type, class com.trial.lombokjackson.Flight]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `com.trial.lombokjackson.Flight` (no Creators, like default constructor, exist): cannot deserialize from Object value (no delegate- or property-based Creator)
 at [Source: (PushbackInputStream); line: 2, column: 5]
2022-01-06 01:13:01.907 ERROR 14672 --- [nio-8080-exec-2] o.a.c.c.C.[.[.[/].[dispatcherServlet]    : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.http.converter.HttpMessageConversionException: Type definition error: [simple type, class com.trial.lombokjackson.Flight]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `com.trial.lombokjackson.Flight` (no Creators, like default constructor, exist): cannot deserialize from Object value (no delegate- or property-based Creator)
 at [Source: (PushbackInputStream); line: 2, column: 5]] with root cause

com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `com.trial.lombokjackson.Flight` (no Creators, like default constructor, exist): cannot deserialize from Object value (no delegate- or property-based Creator)
 at [Source: (PushbackInputStream); line: 2, column: 5]

// omitted the rest of the stack trace

但是，如果我将pojo更改为

@Value
@Builder
@JsonDeserialize(builder = Flight.FlightBuilder.class)
public class Flight {
    private String id;
    private String destination;
    private int flightTime;
    private int flightDuration;

    @JsonPOJOBuilder(withPrefix = "")
    public static class FlightBuilder { }

}

它工作得很完美。根据我在不同站点和文档上所做的研究，@Jacksonized应该取代我为@JsonDeserialize(builder = Flight.FlightBuilder.class)和@JsonPOJOBuilder(withPrefix = "")所做的工作

我是不是漏掉了什么明显的东西？

如果需要更多的信息，请告诉我

谢谢

Answer 1

我解决了这个问题。这是由lombok的旧版本(1.18.12)通过vscode-lombok-plugin安装在VSCode上造成的，@Jacksonized只能从1.18.14开始使用。

github-回购中也存在许多问题，但似乎不再维护它了。

最简单的方法就是

• 出口VSCode
• 从隆布克下载最新的稳定版本
• 导航到%userprofile%\vscode\extensions\gabrielbb.vscode-lombok-1.0.1\server，删除现有的lombok.jar，复制下载的lombok.jar并放置到目录中
• 启动VSCode
• 按F1或Ctrl + Shift + P并选择Java: Clean Java Language Server Workspace
• 提示时重新启动VSCode

它现在应该起作用了