Convert String to LocalDateTime - spring

Question

I have an error in registration of tasks because the time must be converted from String to LocalDateTime and I don't know how to convert.
Below is my Task class:
#Entity
#Table(name = "task", schema = "public")
public class Task {
#Id
#GeneratedValue
private Long id;
#NotEmpty
private String date;
#NotEmpty
private LocalDateTime startTime;
#NotEmpty
private LocalDateTime stopTime;
#NotEmpty
#Column(length = 1000)
private String description;
#ManyToOne
#JoinColumn(name = "USER_EMAIL")
private User user;
public Task() {
}
public Task(String date, LocalDateTime startTime, LocalDateTime stopTime, String description, User user) {
this.date = date;
this.startTime = startTime;
this.stopTime = stopTime;
this.description = description;
this.user = user;
}
public Task(String date, LocalDateTime startTime, LocalDateTime stopTime, String description) {
this.date = date;
this.startTime = startTime;
this.stopTime = stopTime;
this.description = description;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
public String getDate() {
return date;
}
public void setDate(String date) {
this.date = date;
}
public LocalDateTime getStartTime() {
return startTime;
}
public void setStartTime(LocalDateTime startTime) {
this.startTime = startTime;
}
public LocalDateTime getStopTime() {
return stopTime;
}
public void setStopTime(LocalDateTime stopTime) {
this.stopTime = stopTime;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public User getUser() {
return user;
}
public void setUser(User user) {
this.user = user;
}
}
In TaskController class I have that function to register Tasks in the database:
#PostMapping("/addTask")
public String addTask(#Valid Task task,
BindingResult bindingResult,
HttpSession session,
#RequestParam("datetime")
#DateTimeFormat(pattern = "dd.MM.yyyy HH:mm:ss.SSSZ") LocalDateTime dateAndTime) {
if (bindingResult.hasErrors()){
return "views/taskForm";
}
String email = (String) session.getAttribute("email");
taskService.addTask(task, userService.findOne(email));
return "redirect:/users";
}
And in TaskService is the function for adding tasks in TaskController:
public void addTask(Task task, User user) {
task.setUser(user);
taskRepository.save(task);
}
Please can someone resolve this error:
Failed to convert property value of type java.lang.String to required
type java.time.LocalDateTime for property startTime; nested exception
is org.springframework.core.convert.ConversionFailedException: Failed
to convert from type [java.lang.String] to type
[#org.hibernate.validator.constraints.NotEmpty
java.time.LocalDateTime] for value 09:00; nested exception is
java.lang.IllegalArgumentException: Parse attempt failed for value
[09:00]
and this:
Failed to convert property value of type java.lang.String to required
type java.time.LocalDateTime for property stopTime; nested exception
is org.springframework.core.convert.ConversionFailedException: Failed
to convert from type [java.lang.String] to type
[#org.hibernate.validator.constraints.NotEmpty
java.time.LocalDateTime] for value 18:00; nested exception is
java.lang.IllegalArgumentException: Parse attempt failed for value
[18:00]
I have spent many days and I cannot resolve this.
Thanks in advance!

Answer 1

You can write a converter to convert from a String to LocalDateTime and vice versa.
#Converter(autoApply = true)
public class LocalDateTimeConverter implements AttributeConverter<LocalDateTime, String> {
private final DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm:ss");
#Override
public String convertToDatabaseColumn(LocalDateTime locDate) {
return (locDate == null ? null : formatter.format(locDate));
}
#Override
public LocalDateTime convertToEntityAttribute(String dateValue) {
return (dateValue == null ? null : LocalDateTime.parse(dateValue, formatter));
}
}
If you want to define a converter for each variable use
#Convert(converter = LocalDateTimeConverter.class)
private LocalDateTime stopTime;

Answer 2

Use below to convert the time from String to LocalDateTime, but make sure you are getting the time in String form.
String str = "2018-12-10 12:30";
DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd HH:mm");
LocalDateTime dateTime = LocalDateTime.parse(str, formatter);