java.lang.IllegalStateException: No primary or default constructor found for class java.time.LocalDate

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转载自：https://blog.csdn.net/Coder_Arley/article/details/81910705

springboot中报错如下：

springmvc也可以使用类似处理方法。其他参考：SrpingMVC通过JSON注入from数据到实体自定义(LocalDateTime,LocalDate,Boolean类型)字段的序列化、反序列化方法

java.lang.IllegalStateException: No primary or default constructor found for class java.time.LocalDate
at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.createAttribute(ModelAttributeMethodProcessor.java:)
at org.springframework.web.servlet.mvc.method.annotation.ServletModelAttributeMethodProcessor.createAttribute(ServletModelAttributeMethodProcessor.java:)
at org.springframework.web.method.annotation.ModelAttributeMethodProcessor.resolveArgument(ModelAttributeMethodProcessor.java:)
at org.springframework.web.method.support.HandlerMethodArgumentResolverComposite.resolveArgument(HandlerMethodArgumentResolverComposite.java:)
at org.springframework.web.method.support.InvocableHandlerMethod.getMethodArgumentValues(InvocableHandlerMethod.java:)
at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:)
at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:)
at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:)
at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:)

解决方法：在maven添加如下依赖

让框架可以处理jsr310的新日期、时间类

<dependency>
<groupId>com.fasterxml.jackson.datatype</groupId>
<artifactId>jackson-datatype-jsr310</artifactId>
<version>2.9.9</version>
</dependency>

任意一个带Configuration注解的类中添加以下代码

@Bean
public Converter<String, String> StringConvert() {
return new Converter<String, String>() {
@Override
public String convert(String source) {
return StringUtils.trimToNull(source);
}
};
} @Bean
public Converter<String, LocalDate> LocalDateConvert() {
return new Converter<String, LocalDate>() {
@Override
public LocalDate convert(String source) {
if (StringUtils.isBlank(source)) {
return null;
}
return LocalDate.parse(source, DateTimeFormatter.ofPattern("yyyy-MM-dd"));
} };
} @Bean
public Converter<String, LocalDateTime> LocalDateTimeConvert() {
return new Converter<String, LocalDateTime>() {
@Override
public LocalDateTime convert(String source) {
if (StringUtils.isBlank(source)) {
return null;
}
return LocalDateTime.parse(source, DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss"));
} };

Controller里面添加注解@RequestParam(required=false)

@RequestMapping(value = "/test")
@ResponseBody
public String test(@RequestParam(required = false) LocalDate startDate) {
System.out.println(startDate);
return "success";
}