CODEWITHSUNDEEP
javajacksonobjectmapper
theprogrammer
theprogrammer

Reputation: 13

can't create an objectMapper in java

I am creating an instance of the object mapper.

ObjectMapper objectMapper = new ObjectMapper();

This line gives me the following error:

The constructor ObjectMapper() is undefined

What am I doing wrong? Can you please help me? Thanks in advance.

Upvotes: 1

Views: 3734

Answers (3)

qumm
qumm

Reputation: 157

Check libraries in your class.

If you imported other library having same name by mistake, it will cuases a problem.. 

import org.elasticsearch.index.mapper.ObjectMapper;
import com.fasterxml.jackson.databind.*;

ObjectMapper objectMapper = new ObjectMapper();

The first line should be deleted in above example.

Upvotes: 1

rahul shetty
rahul shetty

Reputation: 126

You might be missing the below jar if you are using Jackson 

jackson-mapper-asl-1.5.0.jar

Also try importing below package

import com.fasterxml.jackson.databind.*;

Upvotes: 0

Ulrich Kowohl
Ulrich Kowohl

Reputation: 31

If you use fasterxml jackson ObjectMapper then there is an empty constructor:

/*
/**********************************************************
/* Life-cycle: constructing instance
/**********************************************************
 */

/**
 * Default constructor, which will construct the default
 * {@link JsonFactory} as necessary, use
 * {@link SerializerProvider} as its
 * {@link SerializerProvider}, and
 * {@link BeanSerializerFactory} as its
 * {@link SerializerFactory}.
 * This means that it
 * can serialize all standard JDK types, as well as regular
 * Java Beans (based on method names and Jackson-specific annotations),
 * but does not support JAXB annotations.
 */
public ObjectMapper() {
    this(null, null, null);
}

This is copied from the JavaDoc. Please make sure that the Import statement is correct. I am using 

import com.fasterxml.jackson.databind.ObjectMapper;

and it works for me.

Upvotes: 1

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