title: Spring RestTemplate with rootUri return URI is not absolute error
body: <p>I have a <code>RestTemplate</code> that I build it with <code>RestTemplateBuilder</code>. I set the rootUri for builder. In below method (updateState1) sometimes I got the "URI is not absolute" error. For example when I called this method concurrently for 2 times I often got 1 error.</p>
  
  <p><strong>EDIT and Solution</strong>:
  I use this <code>RestTemplate</code> in service task of camunda process. I launch this project in kubernetes container that has different timezone with the oracle database. When I add timezone variable every things work fine.</p>
  
  <p>Spring boot version: 2.1.1.RELEASE</p>
  
  <p>Here is my code:</p>
  
  <pre><code>@Component
  @Slf4j
  public class CoreServiceClient {
  
      private RestTemplate restTemplate;
  
      private static final String root = "http://localhost:8080/test/api/";
  
      public CoreServiceClient(RestTemplateBuilder restTemplateBuilder) {
          restTemplate = restTemplateBuilder.rootUri(root).build();
      }
  
  
      public void updateState1(UpdateParam updateParam) {
          HttpHeaders headers = generateHeader();
          UpdateRequest updateRequest = new UpdateRequest(updateParam.getState());
  
          HttpEntity&lt;UpdateRequest&gt; httpEntity = new HttpEntity&lt;&gt;(updateRequest, headers);
  
          ResponseEntity&lt;String&gt; response = restTemplate.exchange(
                  "/food/{id}/state",
                  HttpMethod.PUT, httpEntity, String.class, updateParam.getId());
  
      }
      public void updateState2(String id) {
          HttpHeaders headers = generateHeader();
          UpdateRequest updateRequest = new UpdateRequest("done");
  
          HttpEntity&lt;UpdateRequest&gt; httpEntity = new HttpEntity&lt;&gt;(updateRequest, headers);
  
          ResponseEntity&lt;String&gt; response = restTemplate.exchange(
                  "/food/{id}/state",
                  HttpMethod.PUT, httpEntity, String.class, id);
  
      }
  }
  </code></pre>
  
  <p>cuase (stacktrace):</p>
  
  <pre><code>Caused by: java.lang.IllegalArgumentException: URI is not absolute
      at java.net.URI.toURL(URI.java:1088)
      at org.springframework.http.client.SimpleClientHttpRequestFactory.createRequest(SimpleClientHttpRequestFactory.java:145)
      at org.springframework.http.client.support.HttpAccessor.createRequest(HttpAccessor.java:87)
      at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:730)
      at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:669)
      at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:578)
      at com.test.client.CoreServiceClient.updateState(CoreServiceClient.java:39)
      at sun.reflect.GeneratedMethodAccessor263.invoke(Unknown Source)
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
      at java.lang.reflect.Method.invoke(Method.java:498)
      at org.camunda.bpm.engine.impl.javax.el.BeanELResolver.invoke(BeanELResolver.java:479)
      ... 85 more
  </code></pre>