Added eample error message

Added exception handling 

doc/json_samples/ec2_maximum_VPC_reached.json

+{"creationDate":1488794695660,"parameters":[{"name":"com.amazonaws.AmazonServiceException","encoding":"UTF-8","value":"The maximum number of VPCs has been reached. (Service: AmazonEC2; Status Code: 400; Error Code: VpcLimitExceeded; Request ID: e854939e-5386-46f3-baa8-4e3c425b98ee)"}]}
\ No newline at end of file

doc/json_samples/provisioner_provisoned.json

+{"creationDate":1488368936945,"parameters":[{"name":"f293ff03-4b82-49e2-871a-899aadf821ce","encoding":"UTF-8","value":"publicKeyPath: /tmp/Input-4007028381500/user.pem\nuserName: zh9314\nsubnets:\n- {name: s1, subnet: 192.168.10.0, netmask: 255.255.255.0}\ncomponents:\n- name: faab6756-61b6-4800-bffa-ae9d859a9d6c\n  type: Switch.nodes.Compute\n  nodetype: t2.medium\n  OStype: Ubuntu 16.04\n  domain: ec2.us-east-1.amazonaws.com\n  script: /tmp/Input-4007028381500/guiscipt.sh\n  installation: null\n  role: master\n  dockers: mogswitch/InputDistributor\n  public_address: 54.144.0.91\n  instanceId: i-0e78cbf853328b820\n  ethernet_port:\n  - {name: p1, subnet_name: s1, address: 192.168.10.10}\n- name: 1c75eedf-8497-46fe-aeb8-dab6a62154cb\n  type: Switch.nodes.Compute\n  nodetype: t2.medium\n  OStype: Ubuntu 16.04\n  domain: ec2.us-east-1.amazonaws.com\n  script: /tmp/Input-4007028381500/guiscipt.sh\n  installation: null\n  role: slave\n  dockers: mogswitch/ProxyTranscoder\n  public_address: 34.207.254.160\n  instanceId: i-0a99ea18fcc77ed7a\n  ethernet_port:\n  - {name: p1, subnet_name: s1, address: 192.168.10.11}\n"},{"name":"kubernetes","encoding":"UTF-8","value":"54.144.0.91 ubuntu /tmp/Input-4007028381500/Virginia.pem master\n34.207.254.160 ubuntu /tmp/Input-4007028381500/Virginia.pem slave\n"}]}
\ No newline at end of file

drip-api/src/main/java/nl/uva/sne/drip/api/exception/ExceptionHandler.java

+/*
+ * Copyright 2017 S. Koulouzis, Wang Junchao, Huan Zhou, Yang Hu 
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package nl.uva.sne.drip.api.exception;
+
+/**
+ *
+ * @author S. Koulouzis
+ */
+public class ExceptionHandler {
+
+    public static RuntimeException generateException(String name, String value) {
+        if (value.contains("The maximum number of VPCs has been reached")) {
+            return new VMLimitException(name + "." + value);
+        }
+        else{
+            return new InternalServerErrorExeption();
+        }
+    }
+
+}

drip-api/src/main/java/nl/uva/sne/drip/api/exception/InternalServerErrorExeption.java

+/*
+ * Copyright 2017 S. Koulouzis, Wang Junchao, Huan Zhou, Yang Hu 
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package nl.uva.sne.drip.api.exception;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+/**
+ *
+ * @author S. Koulouzis
+ */
+@ResponseStatus(value = HttpStatus.INTERNAL_SERVER_ERROR)
+public class InternalServerErrorExeption extends RuntimeException {
+
+    public InternalServerErrorExeption(String massage) {
+        super(massage);
+    }
+
+    public InternalServerErrorExeption() {
+        super();
+    }
+
+}

drip-api/src/main/java/nl/uva/sne/drip/api/exception/VMLimitException.java

+/*
+ * Copyright 2017 S. Koulouzis, Wang Junchao, Huan Zhou, Yang Hu 
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package nl.uva.sne.drip.api.exception;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+/**
+ *
+ * @author S. Koulouzis
+ */
+@ResponseStatus(value = HttpStatus.INTERNAL_SERVER_ERROR, reason = "The maximum number of VMs has been reached")
+public class VMLimitException extends RuntimeException {
+
+    public VMLimitException(String string) {
+        super(string);
+    }
+
+    public VMLimitException() {
+        super();
+    }
+
+}

drip-api/src/main/java/nl/uva/sne/drip/api/rest/ProvisionController.java

@@ -45,6 +45,7 @@ import org.springframework.web.bind.annotation.ResponseBody;
 import org.springframework.web.bind.annotation.RestController;
 import nl.uva.sne.drip.api.exception.BadRequestException;
 import nl.uva.sne.drip.api.exception.CloudCredentialsNotFoundException;
+import nl.uva.sne.drip.api.exception.ExceptionHandler;
 import nl.uva.sne.drip.api.exception.InternalServerErrorException;
 import nl.uva.sne.drip.api.exception.NotFoundException;
 import nl.uva.sne.drip.api.exception.PlanNotFoundException;
@@ -129,14 +130,15 @@ public class ProvisionController {
         try (DRIPCaller provisioner = new ProvisionerCaller(messageBrokerHost);) {
             Message provisionerInvokationMessage = buildProvisionerMessage(req);
 
-            Message response = (provisioner.call(provisionerInvokationMessage));
+            Message response = (provisioner.call(provisionerInvokationMessage));           
+
 //            Message response = generateFakeResponse();
             List<MessageParameter> params = response.getParameters();
 
             for (MessageParameter p : params) {
                 String name = p.getName();
                 if (name.toLowerCase().contains("exception")) {
-                    throw new InternalServerErrorException(name + ". " + p.getValue());
+                    throw ExceptionHandler.generateException(name, p.getValue());
                 }
                 if (!name.equals("kubernetes")) {
                     String value = p.getValue();

drip-provisioner/src/main/java/nl/uva/sne/drip/drip/provisioner/Consumer.java

@@ -129,6 +129,7 @@ public class Consumer extends DefaultConsumer {
                         + ex.getClass().getName() + "\",\"attributes\": null}]}";
             }
         } finally {
+            Logger.getLogger(Consumer.class.getName()).log(Level.INFO, "Sending Response: {0}", response);
             //We send the response back. No need to change anything here 
             channel.basicPublish("", properties.getReplyTo(), replyProps, response.getBytes("UTF-8"));
             channel.basicAck(envelope.getDeliveryTag(), false);