Retry connection in case of 401 and Bring some more details to the ex…

…ception.

README.md

@@ -140,7 +140,7 @@ You can import it to your maven or gradle project as a dependency
 <dependency>
 	<groupId>io.camunda</groupId>
 	<artifactId>camunda-operate-client-java</artifactId>
-	<version>8.1.7.0</version>
+	<version>8.1.7.1</version>
 </dependency>
 ```
 

build.gradle

@@ -6,7 +6,7 @@ plugins {
 }
 
 group = 'io.camunda'
-version = '8.1.7.0'
+version = '8.1.7.1'
 sourceCompatibility = '8'
 
 repositories {

src/main/java/io/camunda/operate/CamundaOperateClient.java

@@ -84,14 +84,28 @@ public BpmnModelInstance getProcessDefinitionModel(Long key) throws OperateExcep
       throw new OperateException(e);
     }
   }
-
-  public static CloseableHttpResponse execute(CloseableHttpClient httpClient, ClassicHttpRequest request) throws IOException, OperateException {
+  public CloseableHttpResponse execute(CloseableHttpClient httpClient, ClassicHttpRequest request) throws IOException, OperateException {
+	return execute(httpClient, request, 0);
+  }
+  private CloseableHttpResponse execute(CloseableHttpClient httpClient, ClassicHttpRequest request, int count) throws IOException, OperateException {
     CloseableHttpResponse response = httpClient.execute(request);
+    if (response.getCode()==401 && count<=2) {
+    	authentication.authenticate(this);
+    	return execute(httpClient, request, ++count);
+    }
     if (response.getCode()>399) {
-      throw new OperateException("Authentication error : "+response.getCode()+" "+response.getReasonPhrase());
+    	throw createDetailedException(response, request);
     }
     return response;
   }
+
+  private OperateException createDetailedException(CloseableHttpResponse response, ClassicHttpRequest request) throws IOException {
+	  String details = "";
+  	if (request instanceof HttpPost) {
+  		details+= "; Body : " + new String(((HttpPost) request).getEntity().getContent().readAllBytes(), StandardCharsets.UTF_8);
+  	}
+     return new OperateException(request.getPath()+" : "+response.getCode()+" "+response.getReasonPhrase()+details);
+  }
 
   public ProcessInstance getProcessInstance(Long key) throws OperateException {
     return get(key, ProcessInstance.class);

src/main/java/io/camunda/operate/auth/SaasAuthentication.java

@@ -48,7 +48,7 @@ public void authenticate(CamundaOperateClient client) throws OperateException {
         httpPost.setEntity(new StringEntity(data));
 
         try (CloseableHttpClient httpClient = HttpClients.createDefault()) {
-            try (CloseableHttpResponse response = CamundaOperateClient.execute(httpClient, httpPost)) {
+            try (CloseableHttpResponse response = client.execute(httpClient, httpPost)) {
                 JsonNode responseBody = JsonUtils.toJsonNode(response.getEntity().getContent());
                 String token = responseBody.get("access_token").asText();