title: RestTemplate PATCH request
body: <p>I have the following definition for PersonDTO:</p>
  
  <pre><code>public class PersonDTO
  {
      private String id
      private String firstName;
      private String lastName;
      private String maritalStatus;
  }
  </code></pre>
  
  <p>Here is a sample record :</p>
  
  <pre><code>{
      "id": 1,
      "firstName": "John",
      "lastName": "Doe",
      "maritalStatus": "married"
  }
  </code></pre>
  
  <p>Now, John Doe gets divorced. So I need to send a PATCH request to this URL:</p>
  
  <pre><code>http://localhost:8080/people/1
  </code></pre>
  
  <p>With the following request body:</p>
  
  <pre><code>{
      "maritalStatus": "divorced"
  }
  </code></pre>
  
  <p>I cannot figure out how to do it. Here is what I tried so far:</p>
  
  <pre><code>// Create Person
  PersonDTO person = new PersonDTO();
  person.setMaritalStatus("Divorced");
  
  // Create HttpEntity
  final HttpEntity&lt;ObjectNode&gt; requestEntity = new HttpEntity&lt;&gt;(person);
  
  // Create URL (for eg: localhost:8080/people/1)
  final URI url = buildUri(id);
  
  ResponseEntity&lt;Void&gt; responseEntity = restTemplate.exchange(url, HttpMethod.PATCH, requestEntity, Void.class);
  </code></pre>
  
  <p>Here are the problems with the above:</p>
  
  <p>1) As I am setting only MaritalStatus, the other fields would all be null. So if I print out the request, it will look like this:</p>
  
  <pre><code>{
      "id": null,
      "firstName": "null",
      "lastName": "null",
      "maritalStatus": "married" // I only need to update this field.
  }
  </code></pre>
  
  <p>Does that mean that I have to a GET before I do a PATCH?</p>
  
  <p>2) I am getting the following stack trace:</p>
  
  <pre><code>08:48:52.717 ERROR c.n.d.t.s.PersonServiceImpl - Unexpected Exception  : 
  org.springframework.web.client.ResourceAccessException: I/O error on PATCH request for "http://localhost:8080/people/1":Invalid HTTP method: PATCH; nested exception is java.net.ProtocolException: Invalid HTTP method: PATCH
      at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:580) ~[spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
      at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:545) ~[spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
      at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:466) ~[spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
      at com.sp.restclientexample..service.PersonServiceImpl.doPatch(PersonServiceImpl.java:75) ~[classes/:na]
      at com.sp.restclientexample..service.PatchTitle.itDoPatch(PatchTitle.java:53) [test-classes/:na]
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_20]
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_20]
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_20]
      at java.lang.reflect.Method.invoke(Method.java:483) ~[na:1.8.0_20]
      at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50) [junit-4.12.jar:4.12]
      at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) [junit-4.12.jar:4.12]
      at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47) [junit-4.12.jar:4.12]
      at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) [junit-4.12.jar:4.12]
      at org.springframework.test.context.junit4.statements.RunBeforeTestMethodCallbacks.evaluate(RunBeforeTestMethodCallbacks.java:73) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
      at org.springframework.test.context.junit4.statements.RunAfterTestMethodCallbacks.evaluate(RunAfterTestMethodCallbacks.java:82) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
      at org.springframework.test.context.junit4.statements.SpringRepeat.evaluate(SpringRepeat.java:73) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
      at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325) [junit-4.12.jar:4.12]
      at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:224) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
      at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:83) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
      at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) [junit-4.12.jar:4.12]
      at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) [junit-4.12.jar:4.12]
      at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) [junit-4.12.jar:4.12]
      at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) [junit-4.12.jar:4.12]
      at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) [junit-4.12.jar:4.12]
      at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
      at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:68) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
      at org.junit.runners.ParentRunner.run(ParentRunner.java:363) [junit-4.12.jar:4.12]
      at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:163) [spring-test-4.1.6.RELEASE.jar:4.1.6.RELEASE]
      at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) [.cp/:na]
      at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) [.cp/:na]
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459) [.cp/:na]
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675) [.cp/:na]
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) [.cp/:na]
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192) [.cp/:na]
  Caused by: java.net.ProtocolException: Invalid HTTP method: PATCH
      at java.net.HttpURLConnection.setRequestMethod(HttpURLConnection.java:440) ~[na:1.8.0_20]
      at sun.net.www.protocol.http.HttpURLConnection.setRequestMethod(HttpURLConnection.java:517) ~[na:1.8.0_20]
      at org.springframework.http.client.SimpleClientHttpRequestFactory.prepareConnection(SimpleClientHttpRequestFactory.java:209) ~[spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
      at org.springframework.http.client.SimpleClientHttpRequestFactory.createRequest(SimpleClientHttpRequestFactory.java:138) ~[spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
      at org.springframework.http.client.support.HttpAccessor.createRequest(HttpAccessor.java:76) ~[spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
      at org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:565) ~[spring-web-4.1.6.RELEASE.jar:4.1.6.RELEASE]
      ... 33 common frames omitted
  </code></pre>
  
  <p>Appreciate any pointers from folks who have written client applications to consume a Restful webservice using Spring's RestTemplate.</p>
  
  <p>For completeness, let me also state that we use SpringDataRest for our backend restful webservices.</p>
  
  <p>SGB</p>