严重：找不到媒体类型= application / json，类型

Question

我正在尝试创建一个RESTful Web服务，并且创建了一个，但是我得到了一个

找不到针对Media type = application / json错误的MessageBodyWriter

我的Todo课：

package com.jersey.jaxb;

import javax.xml.bind.annotation.XmlAccessType;

import javax.xml.bind.annotation.XmlAccessorType;

import javax.xml.bind.annotation.XmlElement;

import javax.xml.bind.annotation.XmlRootElement;

import javax.xml.bind.annotation.XmlType;

import org.pojomatic.Pojomatic;

import org.pojomatic.annotations.AutoProperty;

@XmlRootElement

@XmlType(name = "todo")

@XmlAccessorType(XmlAccessType.FIELD)

@AutoProperty

public class Todo {

    @XmlElement(name = "summary")

    private final String summary;

    @XmlElement(name = "description")

    private final String description;

    public String getSummary() {

        return summary;

    }

    public String getDescription() {

        return description;

    }

    public Todo() {

        this(new Builder());    

    }

    public Todo(Builder builder) {

        this.summary = builder.summary;

        this.description = builder.description;

    }

    @Override

    public boolean equals(Object o) {

        return Pojomatic.equals(this, o);

    }

    @Override

    public int hashCode() {

        return Pojomatic.hashCode(this);

    }

    @Override

    public String toString() {

        return Pojomatic.toString(this);

    }

    public static class Builder {

        private String description;

        private String summary;

        public Builder summary(String summary) {

            this.summary = summary;

            return this;

        }

        public Builder description(String description) {

            this.description = description;

            return this;

        }

        public Todo build() {

            return new Todo(this);

        }

    }

}

当我在Tomcat服务器上运行此应用程序并运行它时： http：// localhost：8080 / MyFirstWebService / rest / todo

我得到了错误：

严重：找不到针对媒体类型= application / json，类型= class com.jersey.jaxb.Todo，genericType = class com.jersey.jaxb.Todo的MessageBodyWriter。

Answer 1

我有同样的问题，我通过在类中添加一个空的构造函数来解决它public SandBoxClass(){} //-> solved the issue**public SandBoxClass(Integer arg1, Integer arg2) {        this.arg1=arg1;        this.arg2=arg2;}