I am attempting set up a Spring Boot 2.1.5 / Spring MVC app using Thymeleaf as my template engine. I have a bean that will be backing my form (getters and setters omitted for brevity):
public class SchoolNightForm {
private String orgName;
private String address;
private String location;
private String city;
private String state;
private String zip;
private String contactName;
private String phone;
@NotEmpty(message = "Enter a valid email.")
private String email;
@Positive(message = "Value must be positive.")
private int totalStudents;
private LocalDate dateRequested;
}
The HTML template:
<div class='form-group col-sm-9'>
<label for='dateRequested'>Date Requested</label>
<input type='date' required class='form-control' id='dateRequested' name='dateRequested'
th:field='*{dateRequested}' />
<small class='text-danger' th:if="${#fields.hasErrors('dateRequested')}" th:errors='*{dateRequested}'>Valid date required</small>
</div>
Per the Thymeleaf docs , I configured a conversion service:
@Configuration
public class WebConfig implements WebMvcConfigurer {
@Override
public void addFormatters(FormatterRegistry registry) {
registry.addFormatter(dateFormatter());
}
@Bean
public DateFormatter dateFormatter() {
return new DateFormatter("yyyy-MM-dd");
}
}
I initially used the default DateFormatter implementation (no String format provided), but, after, reviewing the error message, and seeing the format that the form was passing to the controller, I modified it accordingly:
Failed to convert property value of type java.lang.String to required type java.time.LocalDate for property dateRequested; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [java.time.LocalDate] for value 2019-05-28; nested exception is java.lang.IllegalArgumentException: Parse attempt failed for value [2019-05-28]
My controller methods:
@GetMapping(value = "school-night")
public String getSchoolNight(Model model) {
model.addAttribute("schoolNightForm", new SchoolNightForm());
return "bk-school-night";
}
@PostMapping(value = "school-night")
public String postSchoolNigh(@Valid SchoolNightForm schoolNightForm, BindingResult result)
throws MessagingException {
if (result.hasErrors()) {
return "bk-school-night";
}
emailService.schoolNightFotm(schoolNightForm);
return "confirm";
}
This error occurs during the post request. Any advice would be appreciated.
My advice to you, accept a date as a string in the dto. However, if needed use DateTimeFormatter
to get the date, just like this:
private final static DateTimeFormatter FORMATTER = DateTimeFormatter.ofPattern("yyyy-MM-dd");
Then use it in your method, to convert it back and forth:
public class SchoolNightForm {
private String orgName;
private String address;
private String location;
private String city;
private String state;
private String zip;
private String contactName;
private String phone;
@NotEmpty(message = "Enter a valid email.")
private String email;
@Positive(message = "Value must be positive.")
private int totalStudents;
private String dateRequested;
}
Then just use declared formatter to parse and format
FORMATTER.format(...); // your temporal accessor like Instant or LocalDateTime
FORMATTER.parse(...); // your string like "2010-01-01"
First make LocalDateConverter
public class LocalDateToStringConverter implements Converter<LocalDate, String> {
@Override
public String convert(LocalDate localDate) {
return localDate.format(DateTimeFormatter.ofPattern("dd-MM-yyyy"));
}
}
After that register it in the ConversionService in the public static void main class. For example:
@SpringBootApplication
@PropertySources({ @PropertySource("classpath:application.properties") })
public class YourApplication {
public static void main(String[] args) {
SpringApplication.run(YourApplication.class, args);
ConversionService conversionService = DefaultConversionService.getSharedInstance();
ConverterRegistry converters = (ConverterRegistry) conversionService;
converters.addConverter(new LocalDateToStringConverter())
}
}
My POM
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-thymeleaf</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jersey</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
application.properties
spring.thymeleaf.enable-spring-el-compiler=true
spring.thymeleaf.servlet.content-type=application/xhtml+xml
spring.main.allow-bean-definition-overriding=true
log4j.logger.org.thymeleaf = DEBUG
log4j.logger.org.thymeleaf.TemplateEngine.CONFIG = TRACE
By error, I am saying String cannot be converted to LocalDate.Perhaps you could add
@JsonDeserialize(using = LocalDateDeserializer.class) // Added
private LocalDate dateRequested;
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