Java type not supported exception

How to handle Java 8 date/time type java.time.LocalDateTime not supported exception

In this short article, we will present a solution for the Java 8 date/time type java.time.LocalDateTime not supported by default exception. This kind of exception is thrown when we tried to convert an Object with LocalDateTime from Java 8 using ObjectMapper .

2. The java.lang.IllegalArgumentException : Java 8 date/time type java.time.LocalDateTime not supported by default

When you face that kind of a warning your console log will probably have the following stack trace.

java.lang.IllegalArgumentException: Java 8 date/time type `java.time.LocalDateTime` not supported by default: add Module "com.fasterxml.jackson.datatype:jackson-datatype-jsr310" to enable handling (through reference chain: com.frontbackend.model["created"]) at com.fasterxml.jackson.databind.ObjectMapper._convert(ObjectMapper.java:4393) ~[jackson-databind-2.13.1.jar:2.13.1] at com.fasterxml.jackson.databind.ObjectMapper.convertValue(ObjectMapper.java:4334) ~[jackson-databind-2.13.1.jar:2.13.1] 

3. Solution for Java 8 date/time type java.time.LocalDateTime not supported by default

Actually, the exception gives us information about how to fix that problem. We need to Module «com.fasterxml.jackson.datatype:jackson-datatype-jsr310» to enable handling Java 8 date/time types.

First add Jackson-Datatype-JSR310 dependency in your pom.xml (you can find the current version in Maven Repository):

 com.fasterxml.jackson.datatype jackson-datatype-jsr310 2.6.6  

ObjectMapper mapper = new ObjectMapper(); mapper.registerModule(new JavaTimeModule()); 

ObjectMapper mapper = new ObjectMapper(); mapper.findAndRegisterModules(); 

ObjectMapper mapper = JsonMapper.builder() .findAndAddModules() .build(); 

4. Conclusion

In this article we presented how to fix java.lang.IllegalArgumentException: Java 8 date/time type java.time.LocalDateTime not supported by default.

Источник

Jackson Error: Java 8 date/time type not supported by default

Learn to fix the error ‘Java 8 date/time type not supported by default‘ while serializing and deserializing Java 8 Date time classes using Jackson.

The error occurs when we serialize a Java object or deserialize JSON to POJO, and the POJO contains new Java 8 date time classes such as LocalDate, LocalTime, LocalDateTime etc.

For example, the following Employee class has LocalDate type field.

When we serialize an instance of this class, we get the following exception:

Exception in thread "main" java.lang.IllegalArgumentException: Java 8 date/time type `java.time.LocalDate` not supported by default: add Module "com.fasterxml.jackson.datatype:jackson-datatype-jsr310" to enable handling (through reference chain: com.howtodoinjava.core.objectToMap.Employee["dateOfBirth"]) at com.fasterxml.jackson.databind.ObjectMapper ._convert(ObjectMapper.java:4393) at com.fasterxml.jackson.databind.ObjectMapper .convertValue(ObjectMapper.java:4324) at com.howtodoinjava.core.objectToMap .ObjectToMapUsingJackson.main(ObjectToMapUsingJackson.java:25)

We must add support to new Java 8 classes in two steps to fix this error.

 com.fasterxml.jackson.datatype jackson-datatype-jsr310 2.13.4 

Second, register the module JavaTimeModule either with ObjectMapper or JsonMapper based on what you are using.

ObjectMapper objectMapper = new ObjectMapper(); objectMapper.registerModule(new JavaTimeModule()); //or JsonMapper jsonMapper = new JsonMapper(); jsonMapper.registerModule(new JavaTimeModule());

After registering the JavaTimeModule, the above error will go away.

The above solution may not work if you are facing this issue due to Hibernate 6 that serializes the objects using FormatMapper instances, and the default is JacksonJsonFormatMapper. The JacksonJsonFormatMapper basically uses a Jackson ObjectMapper instance constructed without any additional options.

To fix the issue, we need to create a custom instance of FormatMapper and assign it through a new property hibernate.type.json_format_mapper.

 spring.jpa.properties.hibernate.type.json_format_mapper=com.howtodoinjava.CustomJacksonJsonFormatMapper

And then create the mapper implementation as follows:

import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.SerializationFeature; import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule; import org.hibernate.type.FormatMapper; import org.hibernate.type.descriptor.WrapperOptions; import org.hibernate.type.descriptor.java.JavaType; import org.hibernate.type.jackson.JacksonJsonFormatMapper; public class JacksonJsonFormatMapperCustom implements FormatMapper < private final FormatMapper delegate; public JacksonJsonFormatMapperCustom() < ObjectMapper objectMapper = createObjectMapper(); delegate = new JacksonJsonFormatMapper(objectMapper); >private static ObjectMapper createObjectMapper() < ObjectMapper objectMapper = new ObjectMapper() .registerModule(new JavaTimeModule()) .configure(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false); return objectMapper; >@Override public T fromString(CharSequence charSequence, JavaType javaType, WrapperOptions wrapperOptions) < return delegate.fromString(charSequence, javaType, wrapperOptions); >@Override public String toString(T t, JavaType javaType, WrapperOptions wrapperOptions) < return delegate.toString(t, javaType, wrapperOptions); >>

Источник

How to Fix the Unsupported Operation Exception in Java

An UnsupportedOperationException is a runtime exception in Java that occurs when a requested operation is not supported. For example, if an unmodifiable List is attempted to be modified by adding or removing elements, an UnsupportedOperationException is thrown. This is one of the common exceptions that occur when working with Java collections such as List, Queue, Set and Map.

The UnsupportedOperationException is a member of the Java Collections Framework. Since it is an unchecked exception, it does not need to be declared in the throws clause of a method or constructor.

What Causes UnsupportedOperationException

An UnsupportedOperationException is thrown when a requested operation cannot be performed because it is not supported for that particular class. One of the most common causes for this exception is using the asList() method of the java.util.Arrays class. Since this method returns a fixed-size unmodifiable List , the add() or remove() methods are unsupported. Trying to add or remove elements from such a List will throw the UnsupportedOperationException exception.

Other cases where this exception can occur include:

• Using wrappers between collections and primitive types.
• Trying to remove elements using an Iterator .
• Trying to add, remove or set elements using ListIterator .

UnsupportedOperationException Example

Here’s an example of an UnsupportedOperationException thrown when an object is attempted to be added to an unmodifiable List :

import java.util.Arrays; import java.util.List; public class UnsupportedOperationExceptionExample < public static void main(String[] args) < String array[] = ; List list = Arrays.asList(array); list.add("d"); > >

Since the Arrays.asList() method returns a fixed-size list, attempting to modify it either by adding or removing elements throws an UnsupportedOperationException .

Running the above code throws the exception:

Exception in thread "main" java.lang.UnsupportedOperationException at java.base/java.util.AbstractList.add(AbstractList.java:153) at java.base/java.util.AbstractList.add(AbstractList.java:111) at UnsupportedOperationExceptionExample.main(UnsupportedOperationExceptionExample.java:8)

How to Resolve UnsupportedOperationException

The UnsupportedOperationException can be resolved by using a mutable collection, such as ArrayList , which can be modified. An unmodifiable collection or data structure should not be attempted to be modified.

The unmodifiable List returned by the Arrays.asList() method in the earlier example can be passed to a new ArrayList object, which can be modified:

import java.util.ArrayList; import java.util.Arrays; import java.util.List; public class UnsupportedOperationExceptionExample < public static void main(String[] args) < String array[] = ; List list = Arrays.asList(array); List arraylist = new ArrayList<>(list); arraylist.add("d"); System.out.println(arraylist); > >

Here, a new ArrayList object is created using the unmodifiable list returned from the Arrays.asList() method. When a new element is added to the ArrayList , it works as expected and resolves the UnsupportedOperationException. Running the above code produces the following output:

Track, Analyze and Manage Errors With Rollbar

Managing errors and exceptions in your code is challenging. It can make deploying production code an unnerving experience. Being able to track, analyze, and manage errors in real-time can help you to proceed with more confidence. Rollbar automates error monitoring and triaging, making fixing Java errors easier than ever. Sign Up Today!

Источник

[Solved] Java 8 date/time type `java.time.Instant` not supported by default

Hello Guys, How are you all? Hope You all Are Fine. Today I am using Lombok plugins and I am trying to use java.time.Instant library But I am facing following error Java 8 date/time type java.time.Instant not supported by default in Java. So Here I am Explain to you all the possible solutions here.

Without wasting your time, Let’s start This Article to Solve This Error.

How This Error Occurs ?

I am using Lombok plugins and I am trying to use java.time.Instant library But I am facing following error.

Type definition error: [simple type, class java.time.Instant]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Java 8 date/time type `java.time.Instant` not supported by default: add Module \”com.fasterxml.jackson.datatype:jackson-datatype-jsr310\” to enable handling

How To Solve Java 8 date/time type java.time.Instant not supported by default Error ?

How To Solve Java 8 date/time type java.time.Instant not supported by default Error ?

To Solve Java 8 date/time type java.time.Instant not supported by default Error Just add this com.fasterxml.jackson.datatype dependency in pom.xml Now, Your error should be solved. Second solution is If You are using com.fasterxml.jackson.datatype.jsr310.JavaTimeModule in your classpath, then JavaTimeModule should be registered. Just adding the dependancy is not enough, you have to declare a @Bean of you module.

Java 8 date/time type java.time.Instant not supported by default

Solution 1: add this dependency in pom.xml

Just add this com.fasterxml.jackson.datatype dependency in pom.xml

 com.fasterxml.jackson.datatype jackson-datatype-jsr310 

Now, Your error should be solved.

Solution 2: Register JavaTimeModule

If You are using com.fasterxml.jackson.datatype.jsr310.JavaTimeModule in your classpath, then JavaTimeModule should be registered. Just adding the dependancy is not enough, you have to declare a @Bean of you module like follow:

@Bean public Module dateTimeModule()

Summary

It’s all About this issue. Hope all solution helped you a lot. Comment below Your thoughts and your queries. Also, Comment below which solution worked for you?

Источник