Home/ Questions/java lang illegalargumentexception uri is not absolute. How to fix?
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Skyla Wilderman
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Asked: 2022-07-11T04:48:11+00:00 In:

java lang illegalargumentexception uri is not absolute. How to fix?

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I meeet the exception java lang illegalargumentexception uri is not absolute as seen in the spring boot below.

2020-10-06 17:15:08.417 ERROR 20534 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.IllegalArgumentException: URI is not absolute] with root cause

java.lang.IllegalArgumentException: URI is not absolute
at java.net.URI.toURL(URI.java:1088) ~[na:1.8.0_101]
at org.springframework.http.client.SimpleClientHttpRequestFactory.createRequest(SimpleClientHttpRequestFactory.java:145) ~[spring-web-5.2.9.RELEASE.jar:5.2.9.RELEASE]
at org.springframework.http.client.support.HttpAccessor.createRequest(HttpAccessor.java:124) ~[spring-web-5.2.9.RELEASE.jar:5.2.9.RELEASE]
at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:735) ~[spring-web-5.2.9.RELEASE.jar:5.2.9.RELEASE]

Please help me find out the cause and solution for it. Thanks.

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1 Answer

  1. Best Answer
    Expert

    The cause: When a relative url is used to specify the resource, java lang illegalargumentexception uri is not absolute is thrown. The whole url will be utilized to make the rest call in the spring boot RestTemplate.

    Solution:

    Solution 1: The relative url must be converted to an absolute url if it is let into the rest call in the RestTemplate. The absolute url will be used by the RestTemplate to locate the resource. The whole url “http:/localhost:8080/student” is being used to execute a rest call with RestTemplate in the example below.

    package com.yawintutor;

import javax.servlet.http.HttpServletRequest;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
public class TestController {

@GetMapping(value = "/student")
public Student getStudent() {
return new Student(1, "name1");
}

@GetMapping(value = "/getstudent")
private Student getStudentObject(HttpServletRequest request)
{
String uri = "http://localhost:8080/student";
RestTemplate restTemplate = new RestTemplate();
Student result = restTemplate.getForObject(uri, Student.class);
return result;
}
}

    Solution 2:

    Use the HTTPRequest object to create a complete url if it is using a relative url inside a rest call that points to the same Tomcat server before passing it to the rest template. The example that follows shows how to build an entire url from a relative url to the same server.

    package com.yawintutor;

import javax.servlet.http.HttpServletRequest;

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
public class TestController {

@GetMapping(value = "/student")
public Student getStudent() {
return new Student(1, "name1");
}

@GetMapping(value = "/getstudent")
private Student getStudentObject(HttpServletRequest request)
{
String requestURL = request.getRequestURL().substring(0, request.getRequestURL().indexOf(request.getRequestURI()));
String uri = requestURL + "/student";
RestTemplate restTemplate = new RestTemplate();
Student result = restTemplate.getForObject(uri, Student.class);
return result;
}
}

    Solution 3:

    When using a relative url in a RestTemplate and needing to refer to an external host server, its url can be externalized inside the application.properties files. The relative url can have the properties added, like in the example below.

    application.properties

    external.server.url=http://www.yawintutor.com

    TestController.java

    package com.yawintutor;

import javax.servlet.http.HttpServletRequest;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;

@RestController
public class TestController {

@Value("${external.server.url}")
String externalServerURL;

@GetMapping(value = "/student")
public Student getStudent() {
return new Student(1, "name1");
}

@GetMapping(value = "/getstudent")
private Student getStudentObject()
{
String uri = externalServerURL + "/student";
RestTemplate restTemplate = new RestTemplate();
Student result = restTemplate.getForObject(uri, Student.class);
return result;
}
}
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