How to solve the “Class has two properties of the same name” JAXB error (WebSphere Application Server)

Today, when I was creating a RESTful service in JavaEE for a dynamic web application to run in IBM® WebSphere  Application Server (WAS) an error like this was appearing:

Class has two properties of the same name "userId" 
this problem is related to the following location: 
at public java.lang.String com.rest.model.UserProfile.getUserId() 
at com.rest.model.UserProfile this problem is related to the following location: 
at private java.lang.String com.rest.model.UserProfile.userId 
at com.rest.model.UserProfile

java

After looking for documentation and all related issues, I found a solution that I would like to share with you:

1) My class looked like this:

package com.rest.model;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

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.XmlElementWrapper;
import javax.xml.bind.annotation.XmlType;

/**
 * @author Alex Arriaga
 */
@XmlRootElement(name = "profile")
public class UserProfile{
	@XmlElement(name="user_id")
	private String userId;

	// More code here...

	public UserProfile(){

	}

	public UserProfile(String s){
		this.test = s;
	}

	public String getUserId() {
		return userId;
	}

	public void setUserId(String userId) {
		this.userId = userId;
	}

	// More code here...

}

 2) How to fix it

It was really easy after spending time to search this issue. My JAXB was looking at both the getUserId() method and the member userId. I didn’t say which JAXB implementation I was using, the exception was fairly clear but that was the first time that I was working with JABX, at the beginning it is a little complicated to understand that message.

To solve this issue just was necessary to specify to JAXB which implementation I wanted to use using @XmlAccessorType(XmlAccessType.FIELD) annotation after @XmlRootElement(name = “profile”) please, see next code to have a clearer idea.

package com.rest.model;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

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.XmlElementWrapper;
import javax.xml.bind.annotation.XmlType;

/**
 * @author Alex Arriaga
 *
 */
@XmlRootElement(name = "profile")
@XmlAccessorType(XmlAccessType.FIELD) // This line was added
public class UserProfile{
	@XmlElement(name="user_id")
	private String userId;

	// More code here...

	public UserProfile(){

	}

	public UserProfile(String s){
		this.test = s;
	}

	public String getUserId() {
		return userId;
	}

	public void setUserId(String userId) {
		this.userId = userId;
	}

	// More code here...

}

That’s it!

Be happy with your code.

 

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