diff --git a/bpmn/MSOCommonBPMN/src/main/groovy/org/onap/so/bpmn/common/scripts/ExternalAPIUtil.groovy b/bpmn/MSOCommonBPMN/src/main/groovy/org/onap/so/bpmn/common/scripts/ExternalAPIUtil.groovy
index 5c935e9..250cdda 100644
--- a/bpmn/MSOCommonBPMN/src/main/groovy/org/onap/so/bpmn/common/scripts/ExternalAPIUtil.groovy
+++ b/bpmn/MSOCommonBPMN/src/main/groovy/org/onap/so/bpmn/common/scripts/ExternalAPIUtil.groovy
@@ -19,29 +19,30 @@
  */
 
 package org.onap.so.bpmn.common.scripts
-import org.camunda.bpm.engine.delegate.BpmnError
+
+
 import org.camunda.bpm.engine.delegate.DelegateExecution
-import org.onap.so.bpmn.common.scripts.AbstractServiceTaskProcessor;
+import org.onap.logging.ref.slf4j.ONAPLogConstants
 import org.onap.so.client.HttpClient
+import org.onap.so.client.HttpClientFactory
 import org.onap.so.logger.MsoLogger
-import org.apache.commons.lang3.StringEscapeUtils
-import java.util.regex.Matcher
-import java.util.regex.Pattern
+import org.onap.so.utils.TargetEntity
 
 import javax.ws.rs.core.MediaType
 import javax.ws.rs.core.Response
-import org.onap.so.utils.TargetEntity
+import java.util.regex.Matcher
+import java.util.regex.Pattern
 
 class ExternalAPIUtil {
 
 	String Prefix="EXTAPI_"
 
-	public MsoUtils utils = new MsoUtils()
-
-	ExceptionUtil exceptionUtil = new ExceptionUtil()
-
 	private static final MsoLogger msoLogger = MsoLogger.getMsoLogger(MsoLogger.Catalog.BPEL, ExternalAPIUtil.class)
 
+	private final HttpClientFactory httpClientFactory;
+	private final MsoUtils utils;
+	private final ExceptionUtil exceptionUtil;
+
 	public static final String PostServiceOrderRequestsTemplate =
 	"{\n" +
 	"\t\"externalId\": <externalId>,\n" +
@@ -85,7 +86,10 @@
     "\t} \n" +
     "}"
 
-	public ExternalAPIUtil() {
+	ExternalAPIUtil(HttpClientFactory httpClientFactory, MsoUtils utils, ExceptionUtil exceptionUtil) {
+		this.httpClientFactory = httpClientFactory
+		this.utils = utils
+		this.exceptionUtil = exceptionUtil
 	}
 
 //	public String getUri(DelegateExecution execution, resourceName) {
@@ -137,8 +141,7 @@
 			msoLogger.debug( "Generated uuid is: " + uuid)
 			msoLogger.debug( "URL to be used is: " + url)
 
-			URL Url = new URL(url)
-			HttpClient client = new HttpClient(Url, MediaType.APPLICATION_JSON, TargetEntity.EXTERNAL)
+			HttpClient client = httpClientFactory.create(new URL(url), MediaType.APPLICATION_JSON, TargetEntity.EXTERNAL)
 			client.addBasicAuthHeader(execution.getVariable("URN_externalapi_auth"), execution.getVariable("URN_mso_msoKey"))
 			client.addAdditionalHeader("X-FromAppId", "MSO")
 			client.addAdditionalHeader(ONAPLogConstants.Headers.REQUEST_ID, uuid)
@@ -166,17 +169,15 @@
 	 * @return Response
 	 *
 	 */
-	public Response executeExternalAPIPostCall(DelegateExecution execution, String urlString, String payload){
+	public Response executeExternalAPIPostCall(DelegateExecution execution, String url, String payload){
 		msoLogger.debug( " ======== Started Execute ExternalAPI Post Process ======== ")
 		Response apiResponse = null
 		try{
 			String uuid = utils.getRequestID()
 			msoLogger.debug( "Generated uuid is: " + uuid)
-			msoLogger.debug( "URL to be used is: " + urlString)
+			msoLogger.debug( "URL to be used is: " + url)
 
-			URL url = new URL(urlString);
-
-			HttpClient httpClient = new HttpClient(url, "application/json", TargetEntity.AAI)
+			HttpClient httpClient = httpClientFactory.create(new URL(url), MediaType.APPLICATION_JSON, TargetEntity.AAI)
 			httpClient.addBasicAuthHeader(execution.getVariable("URN_externalapi_auth"), execution.getVariable("URN_mso_msoKey"))
 			httpClient.addAdditionalHeader("X-FromAppId", "MSO")
 			httpClient.addAdditionalHeader("X-TransactionId", uuid)
diff --git a/bpmn/MSOCommonBPMN/src/main/groovy/org/onap/so/bpmn/common/scripts/ExternalAPIUtilFactory.groovy b/bpmn/MSOCommonBPMN/src/main/groovy/org/onap/so/bpmn/common/scripts/ExternalAPIUtilFactory.groovy
new file mode 100644
index 0000000..e7f4646
--- /dev/null
+++ b/bpmn/MSOCommonBPMN/src/main/groovy/org/onap/so/bpmn/common/scripts/ExternalAPIUtilFactory.groovy
@@ -0,0 +1,29 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - SO
+ * ================================================================================
+ * Copyright (C) 2018 Nokia.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.so.bpmn.common.scripts
+
+import org.onap.so.client.HttpClientFactory
+
+class ExternalAPIUtilFactory {
+
+    ExternalAPIUtil create() {
+        return new ExternalAPIUtil(new HttpClientFactory(), new MsoUtils(), new ExceptionUtil())
+    }
+}
diff --git a/bpmn/MSOCommonBPMN/src/test/groovy/org/onap/so/bpmn/common/scripts/ExternalAPIUtilTest.groovy b/bpmn/MSOCommonBPMN/src/test/groovy/org/onap/so/bpmn/common/scripts/ExternalAPIUtilTest.groovy
new file mode 100644
index 0000000..5f428f1
--- /dev/null
+++ b/bpmn/MSOCommonBPMN/src/test/groovy/org/onap/so/bpmn/common/scripts/ExternalAPIUtilTest.groovy
@@ -0,0 +1,199 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - SO
+ * ================================================================================
+ * Copyright (C) 2018 Nokia.
+ * ================================================================================
+ * 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.
+ * ============LICENSE_END=========================================================
+ */
+package org.onap.so.bpmn.common.scripts
+
+import org.assertj.core.api.AbstractAssert
+import org.camunda.bpm.engine.delegate.BpmnError
+import org.camunda.bpm.engine.delegate.DelegateExecution
+import org.junit.Test
+import org.onap.logging.ref.slf4j.ONAPLogConstants
+import org.onap.so.client.HttpClient
+import org.onap.so.client.HttpClientFactory
+import org.onap.so.utils.TargetEntity
+import org.springframework.http.HttpStatus
+
+import javax.ws.rs.core.MediaType
+import javax.ws.rs.core.Response
+
+import static org.assertj.core.api.Assertions.assertThat
+import static org.assertj.core.api.Assertions.catchThrowableOfType
+import static org.mockito.BDDMockito.given
+import static org.mockito.BDDMockito.then
+import static org.mockito.BDDMockito.willThrow
+import static org.mockito.Mockito.mock
+import static org.mockito.Mockito.times
+
+class ExternalAPIUtilTest {
+
+    private static final String URL = "http://someUrl"
+    private static final String UUID_STR = UUID.nameUUIDFromBytes("deterministic_uuid".getBytes())
+    private static final String BODY_PAYLOAD = "payload"
+
+    @Test
+    void executeExternalAPIGetCall_shouldPerformRestGetCall_withAuthorizationHeaderSet() {
+        // GIVEN
+        Response expectedResponse = createExpectedResponse(HttpStatus.ACCEPTED, BODY_PAYLOAD)
+        HttpClient httpClient = mock(HttpClient.class)
+        given(httpClient.get()).willReturn(expectedResponse)
+        HttpClientFactory httpClientFactory = mock(HttpClientFactory.class)
+        given(httpClientFactory.create(new URL(URL), MediaType.APPLICATION_JSON, TargetEntity.EXTERNAL)).willReturn(httpClient)
+
+        // WHEN
+        ExternalAPIUtil externalAPIUtil = new ExternalAPIUtil(httpClientFactory, new DummyMsoUtils(UUID_STR), new ExceptionUtil())
+        Response apiResponse = externalAPIUtil.executeExternalAPIGetCall(createDelegateExecution(), URL)
+
+        // THEN
+        then(httpClient).should(times(1)).addBasicAuthHeader("value_externalapi_auth", "value_mso_msoKey")
+        then(httpClient).should(times(1)).addAdditionalHeader("X-FromAppId", "MSO")
+        then(httpClient).should(times(1)).addAdditionalHeader(ONAPLogConstants.Headers.REQUEST_ID, UUID_STR)
+        then(httpClient).should(times(1)).addAdditionalHeader("Accept", MediaType.APPLICATION_JSON)
+        ResponseAssert.assertThat(apiResponse)
+                .hasStatusCode(HttpStatus.ACCEPTED)
+                .hasBody(BODY_PAYLOAD)
+    }
+
+    @Test
+    void executeExternalAPIGetCall_shouldHandleExceptionsThrownByGetCall_andRethrowAsBpmnError() {
+        // GIVEN
+        HttpClient httpClient = mock(HttpClient.class)
+        willThrow(new RuntimeException("error occurred")).given(httpClient).get()
+        HttpClientFactory httpClientFactory = mock(HttpClientFactory.class)
+        given(httpClientFactory.create(new URL(URL), MediaType.APPLICATION_JSON, TargetEntity.EXTERNAL)).willReturn(httpClient)
+        DelegateExecution delegateExecution = createDelegateExecution()
+        DummyExceptionUtil exceptionUtil = new DummyExceptionUtil()
+
+        // WHEN
+        ExternalAPIUtil externalAPIUtil = new ExternalAPIUtil(httpClientFactory, new DummyMsoUtils(UUID_STR), exceptionUtil)
+        BpmnError bpmnError = catchThrowableOfType({ -> externalAPIUtil.executeExternalAPIGetCall(delegateExecution, URL)
+        }, BpmnError.class)
+
+        // THEN
+        assertThat(exceptionUtil.getDelegateExecution()).isSameAs(delegateExecution)
+        assertThat(bpmnError.getMessage()).isEqualTo("error occurred")
+        assertThat(bpmnError.getErrorCode()).isEqualTo("9999")
+    }
+
+    @Test
+    void executeExternalAPIPostCall_shouldHandleExceptionsThrownByPostCall_andRethrowAsBpmnError() {
+        // GIVEN
+        HttpClient httpClient = mock(HttpClient.class)
+        willThrow(new RuntimeException("error occurred")).given(httpClient).post(BODY_PAYLOAD)
+        HttpClientFactory httpClientFactory = mock(HttpClientFactory.class)
+        given(httpClientFactory.create(new URL(URL), MediaType.APPLICATION_JSON, TargetEntity.AAI)).willReturn(httpClient)
+        DelegateExecution delegateExecution = createDelegateExecution()
+        DummyExceptionUtil exceptionUtil = new DummyExceptionUtil()
+
+        // WHEN
+        ExternalAPIUtil externalAPIUtil = new ExternalAPIUtil(httpClientFactory, new DummyMsoUtils(UUID_STR), exceptionUtil)
+        BpmnError bpmnError = catchThrowableOfType({ ->
+            externalAPIUtil.executeExternalAPIPostCall(delegateExecution, URL, BODY_PAYLOAD)
+        }, BpmnError.class)
+
+        // THEN
+        assertThat(exceptionUtil.getDelegateExecution()).isSameAs(delegateExecution)
+        assertThat(bpmnError.getMessage()).isEqualTo("error occurred")
+        assertThat(bpmnError.getErrorCode()).isEqualTo("9999")
+    }
+
+    @Test
+    void executeExternalAPIPostCall_shouldPerformRestPostCall_withPayloadAndAuthorizationHeaderSet() {
+        // GIVEN
+        Response expectedResponse = createExpectedResponse(HttpStatus.ACCEPTED, BODY_PAYLOAD)
+        HttpClient httpClient = mock(HttpClient.class)
+        given(httpClient.post(BODY_PAYLOAD)).willReturn(expectedResponse)
+        HttpClientFactory httpClientFactory = mock(HttpClientFactory.class)
+        given(httpClientFactory.create(new URL(URL), MediaType.APPLICATION_JSON, TargetEntity.AAI)).willReturn(httpClient)
+
+        // WHEN
+        ExternalAPIUtil externalAPIUtil = new ExternalAPIUtil(httpClientFactory, new DummyMsoUtils(UUID_STR), new ExceptionUtil())
+        Response apiResponse = externalAPIUtil.executeExternalAPIPostCall(createDelegateExecution(), URL, BODY_PAYLOAD)
+
+        // THEN
+        then(httpClient).should(times(1)).addBasicAuthHeader("value_externalapi_auth", "value_mso_msoKey")
+        then(httpClient).should(times(1)).addAdditionalHeader("X-FromAppId", "MSO")
+        then(httpClient).should(times(1)).addAdditionalHeader("X-TransactionId", UUID_STR)
+        ResponseAssert.assertThat(apiResponse)
+                .hasStatusCode(HttpStatus.ACCEPTED)
+                .hasBody(BODY_PAYLOAD)
+    }
+
+    private Response createExpectedResponse(HttpStatus httpStatus, String body) {
+        Response expectedResponse = mock(Response.class)
+        given(expectedResponse.getStatus()).willReturn(httpStatus.value())
+        given(expectedResponse.getEntity()).willReturn(body)
+        return expectedResponse
+    }
+
+    private DelegateExecution createDelegateExecution() {
+        DelegateExecution delegateExecution = mock(DelegateExecution.class)
+        given(delegateExecution.getVariable("URN_externalapi_auth")).willReturn("value_externalapi_auth")
+        given(delegateExecution.getVariable("URN_mso_msoKey")).willReturn("value_mso_msoKey")
+        return delegateExecution
+    }
+
+    private static class ResponseAssert extends AbstractAssert<ResponseAssert, Response> {
+
+        ResponseAssert(Response response) {
+            super(response, ResponseAssert.class)
+        }
+
+        static ResponseAssert assertThat(Response response) {
+            return new ResponseAssert(response)
+        }
+
+        ResponseAssert hasStatusCode(HttpStatus httpStatus) {
+            assertThat(actual.getStatus()).isEqualTo(httpStatus.value())
+            return this
+        }
+
+        ResponseAssert hasBody(String responseBody) {
+            assertThat(actual.getEntity()).isEqualTo(responseBody)
+            return this
+        }
+    }
+
+    private static class DummyMsoUtils extends MsoUtils {
+
+        private final String uuid
+
+        DummyMsoUtils(String uuid) {
+            this.uuid = uuid
+        }
+
+        String getRequestID() {
+            return uuid
+        }
+    }
+
+    private static class DummyExceptionUtil extends ExceptionUtil {
+
+        private DelegateExecution delegateExecution
+
+        @Override
+        void buildAndThrowWorkflowException(DelegateExecution delegateExecution, int errorCode, String errorMessage) {
+            this.delegateExecution = delegateExecution
+            throw new BpmnError(String.valueOf(errorCode), errorMessage)
+        }
+
+        DelegateExecution getDelegateExecution() {
+            return delegateExecution
+        }
+    }
+}
\ No newline at end of file
diff --git a/bpmn/mso-infrastructure-bpmn/pom.xml b/bpmn/mso-infrastructure-bpmn/pom.xml
index e3d6112..f84d485 100644
--- a/bpmn/mso-infrastructure-bpmn/pom.xml
+++ b/bpmn/mso-infrastructure-bpmn/pom.xml
@@ -220,12 +220,12 @@
 			<artifactId>camunda-bpm-assert</artifactId>
 			<version>2.0-alpha2</version>
 			<scope>test</scope>
-		</dependency>	
+		</dependency>
 		<dependency>
-            <groupId>org.assertj</groupId>
-            <artifactId>assertj-core</artifactId>
-            <version>1.7.0</version>
-            <scope>test</scope>
-        </dependency>	
+			<groupId>org.assertj</groupId>
+			<artifactId>assertj-core</artifactId>
+			<version>1.7.0</version>
+			<scope>test</scope>
+		</dependency>
 	</dependencies>
 </project>
diff --git a/bpmn/pom.xml b/bpmn/pom.xml
index a7b49bc..c66178b 100644
--- a/bpmn/pom.xml
+++ b/bpmn/pom.xml
@@ -64,7 +64,7 @@
 			<dependency>
 				<groupId>org.assertj</groupId>
 				<artifactId>assertj-core</artifactId>
-				<version>1.7.0</version>
+				<version>3.11.1</version>
 				<scope>test</scope>
 			</dependency>
 		</dependencies>
diff --git a/bpmn/so-bpmn-building-blocks/pom.xml b/bpmn/so-bpmn-building-blocks/pom.xml
index 8f1f2bf..4fe02ee 100644
--- a/bpmn/so-bpmn-building-blocks/pom.xml
+++ b/bpmn/so-bpmn-building-blocks/pom.xml
@@ -107,6 +107,12 @@
 			<scope>test</scope>
 		</dependency>
 		<dependency>
+			<groupId>org.assertj</groupId>
+			<artifactId>assertj-core</artifactId>
+			<version>1.7.0</version>
+			<scope>test</scope>
+		</dependency>
+		<dependency>
 			<groupId>org.springframework.boot</groupId>
 			<artifactId>spring-boot-starter-test</artifactId>
 			<scope>test</scope>
diff --git a/bpmn/so-bpmn-infrastructure-common/src/main/groovy/org/onap/so/bpmn/infrastructure/scripts/Create3rdONAPE2EServiceInstance.groovy b/bpmn/so-bpmn-infrastructure-common/src/main/groovy/org/onap/so/bpmn/infrastructure/scripts/Create3rdONAPE2EServiceInstance.groovy
index 2ae7686..05fd517 100644
--- a/bpmn/so-bpmn-infrastructure-common/src/main/groovy/org/onap/so/bpmn/infrastructure/scripts/Create3rdONAPE2EServiceInstance.groovy
+++ b/bpmn/so-bpmn-infrastructure-common/src/main/groovy/org/onap/so/bpmn/infrastructure/scripts/Create3rdONAPE2EServiceInstance.groovy
@@ -23,6 +23,7 @@
 import org.json.JSONArray
 import org.json.JSONObject
 import org.json.XML
+import org.onap.so.bpmn.common.scripts.ExternalAPIUtilFactory
 
 import static org.apache.commons.lang3.StringUtils.*
 import groovy.xml.XmlUtil
@@ -381,7 +382,7 @@
 		valueMap.put("serviceName", '"' + serviceName + '"')
 		valueMap.put("serviceUuId", '"' + serviceUuId + '"')
 
-		ExternalAPIUtil externalAPIUtil = new ExternalAPIUtil()
+		ExternalAPIUtil externalAPIUtil = new ExternalAPIUtilFactory().create()
 
 		// insert CallSource='ExternalAPI' to uuiRequest
 		Map<String, String> requestInputsMap = new HashMap<>()
@@ -426,7 +427,7 @@
 		msoLogger.debug("doCreateE2ESIin3rdONAP externalAPIURL is: " + extAPIPath)
 		msoLogger.debug("doCreateE2ESIin3rdONAP payload is: " + payload)
 
-		ExternalAPIUtil externalAPIUtil = new ExternalAPIUtil()
+		ExternalAPIUtil externalAPIUtil = new ExternalAPIUtilFactory().create()
 		execution.setVariable("ServiceOrderId", "")
 
 		Response response = externalAPIUtil.executeExternalAPIPostCall(execution, extAPIPath, payload)
@@ -471,7 +472,7 @@
 		extAPIPath += "/" + execution.getVariable("ServiceOrderId")
 		msoLogger.debug("getE2ESIProgressin3rdONAP create externalAPIURL is: " + extAPIPath)
 
-		ExternalAPIUtil externalAPIUtil = new ExternalAPIUtil()
+		ExternalAPIUtil externalAPIUtil = new ExternalAPIUtilFactory().create()
 
 		Response response = externalAPIUtil.executeExternalAPIGetCall(execution, extAPIPath)
 
diff --git a/bpmn/so-bpmn-infrastructure-common/src/main/groovy/org/onap/so/bpmn/infrastructure/scripts/Delete3rdONAPE2EServiceInstance.groovy b/bpmn/so-bpmn-infrastructure-common/src/main/groovy/org/onap/so/bpmn/infrastructure/scripts/Delete3rdONAPE2EServiceInstance.groovy
index 078d68b..b718e4a 100644
--- a/bpmn/so-bpmn-infrastructure-common/src/main/groovy/org/onap/so/bpmn/infrastructure/scripts/Delete3rdONAPE2EServiceInstance.groovy
+++ b/bpmn/so-bpmn-infrastructure-common/src/main/groovy/org/onap/so/bpmn/infrastructure/scripts/Delete3rdONAPE2EServiceInstance.groovy
@@ -20,6 +20,8 @@
 
 package org.onap.so.bpmn.infrastructure.scripts
 
+import org.onap.so.bpmn.common.scripts.ExternalAPIUtilFactory
+
 import javax.ws.rs.NotFoundException
 import javax.ws.rs.core.Response
 
@@ -249,7 +251,7 @@
 		valueMap.put("serviceName", "null")
 		valueMap.put("serviceUuId", '"' + serviceSpecificationId + '"')
 
-		ExternalAPIUtil externalAPIUtil = new ExternalAPIUtil()
+		ExternalAPIUtil externalAPIUtil = new ExternalAPIUtilFactory().create()
 
 		valueMap.put("_requestInputs_",  "")
 
@@ -271,7 +273,7 @@
 		String extAPIPath = sppartnerUrl + "/service?relatedParty.id=" + globalSubscriberId
 		msoLogger.debug("queryServicefrom3rdONAP externalAPIURL is: " + extAPIPath)
 
-		ExternalAPIUtil externalAPIUtil = new ExternalAPIUtil()
+		ExternalAPIUtil externalAPIUtil = new ExternalAPIUtilFactory().create()
 
 		Response response = externalAPIUtil.executeExternalAPIGetCall(execution, extAPIPath)
 
@@ -317,7 +319,7 @@
 		msoLogger.debug("doDeleteE2ESIin3rdONAP externalAPIURL is: " + extAPIPath)
 		msoLogger.debug("doDeleteE2ESIin3rdONAP payload is: " + payload)
 
-		ExternalAPIUtil externalAPIUtil = new ExternalAPIUtil()
+		ExternalAPIUtil externalAPIUtil = new ExternalAPIUtilFactory().create()
 		execution.setVariable("ServiceOrderId", "")
 
 		Response response = externalAPIUtil.executeExternalAPIPostCall(execution, extAPIPath, payload)
@@ -361,7 +363,7 @@
 		extAPIPath += "/" + execution.getVariable("ServiceOrderId")
 		msoLogger.debug("getE2ESIProgressin3rdONAP delete externalAPIURL is: " + extAPIPath)
 
-		ExternalAPIUtil externalAPIUtil = new ExternalAPIUtil()
+		ExternalAPIUtil externalAPIUtil = new ExternalAPIUtilFactory().create()
 
 		Response response = externalAPIUtil.executeExternalAPIGetCall(execution, extAPIPath)