Add RFC 8040 compliant error handler

Add a new error handler that formats error responses consistent
with RFC 8040 (RESTCONF) standards.

Change-Id: I67a6ab626d943115570f2e74d0a8132933726bc8
Issue-ID: CCSDK-2482
Signed-off-by: Dan Timoney <dtimoney@att.com>

14 files changed, 784 insertions, 0 deletions

diff --git a/services/src/main/java/org/onap/ccsdk/apps/services/RestApplicationError.java b/services/src/main/java/org/onap/ccsdk/apps/services/RestApplicationError.java
new file mode 100644
index 00000000..e63e1d91
--- /dev/null
+++ b/services/src/main/java/org/onap/ccsdk/apps/services/RestApplicationError.java
@@ -0,0 +1,31 @@
+package org.onap.ccsdk.apps.services;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonRootName;
+import com.fasterxml.jackson.annotation.JsonValue;
+
+
+@JsonRootName(value="error")
+public class RestApplicationError extends RestError {
+
+
+    public RestApplicationError() {
+        this.errorType = "application";
+    }
+
+    public RestApplicationError(String errorTag, String errorMessage) {
+        this.errorType = "application";
+        this.errorTag = errorTag;
+        this.errorMessage = errorMessage;
+        this.errorInfo = errorMessage;
+    }
+
+    public RestApplicationError(String errorTag, String errorMessage, Throwable t) {
+        this.errorType = "application";
+        this.errorTag = errorTag;
+        this.errorMessage = errorMessage;
+        this.errorInfo = t.getLocalizedMessage();
+    }
+
+
+}
diff --git a/services/src/main/java/org/onap/ccsdk/apps/services/RestApplicationException.java b/services/src/main/java/org/onap/ccsdk/apps/services/RestApplicationException.java
new file mode 100644
index 00000000..73613399
--- /dev/null
+++ b/services/src/main/java/org/onap/ccsdk/apps/services/RestApplicationException.java
@@ -0,0 +1,14 @@
+package org.onap.ccsdk.apps.services;
+
+public class RestApplicationException extends RestException {
+
+    public RestApplicationException(String errorTag, String errorMessage, int status) {
+        this.restError = new RestApplicationError(errorTag, errorMessage);
+        this.status = status;
+    }
+
+    public RestApplicationException(String errorTag, String errorMessage, Throwable t, int status) {
+        this.restError = new RestApplicationError(errorTag, errorMessage, t);
+        this.status = status;
+    }
+}
diff --git a/services/src/main/java/org/onap/ccsdk/apps/services/RestError.java b/services/src/main/java/org/onap/ccsdk/apps/services/RestError.java
new file mode 100644
index 00000000..d2e4c7ab
--- /dev/null
+++ b/services/src/main/java/org/onap/ccsdk/apps/services/RestError.java
@@ -0,0 +1,57 @@
+package org.onap.ccsdk.apps.services;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonRootName;
+
+@JsonRootName(value="error")
+public abstract class RestError {
+
+    protected String errorType;
+    protected String errorTag;
+    protected String errorPath;
+    protected String errorMessage;
+    protected String errorInfo;
+
+
+    @JsonProperty("error-type")
+    public String getErrorType() {
+        return errorType;
+    }
+
+    @JsonProperty("error-tag")
+    public String getErrorTag() {
+        return errorTag;
+    }
+
+    public void setErrorTag(String errorTag) {
+        this.errorTag = errorTag;
+    }
+
+    @JsonProperty("error-path")
+    public String getErrorPath() {
+        return errorPath;
+    }
+
+    public void setErrorPath(String errorPath) {
+        this.errorPath = errorPath;
+    }
+
+    @JsonProperty("error-message")
+    public String getErrorMessage() {
+        return errorMessage;
+    }
+
+    public void setErrorMessage(String errorMessage) {
+        this.errorMessage = errorMessage;
+    }
+
+    @JsonProperty("error-info")
+    public String getErrorInfo() {
+        return errorInfo;
+    }
+
+    public void setErrorInfo(String errorInfo) {
+        this.errorInfo = errorInfo;
+    }
+
+}
diff --git a/services/src/main/java/org/onap/ccsdk/apps/services/RestErrors.java b/services/src/main/java/org/onap/ccsdk/apps/services/RestErrors.java
new file mode 100644
index 00000000..5fac3618
--- /dev/null
+++ b/services/src/main/java/org/onap/ccsdk/apps/services/RestErrors.java
@@ -0,0 +1,28 @@
+package org.onap.ccsdk.apps.services;
+
+import com.fasterxml.jackson.annotation.JsonRootName;
+
+import java.util.LinkedList;
+import java.util.List;
+
+@JsonRootName(value="errors")
+public class RestErrors {
+    List<RestError> errors;
+
+    public RestErrors()
+    {
+        this.errors = new LinkedList<RestError>();
+    }
+
+    public RestErrors(RestError error) {
+        this.errors = new LinkedList<RestError>();
+        errors.add(error);
+    }
+    public void addError(RestError error) {
+        errors.add(error);
+    }
+
+    public List<RestError> getErrors() {
+        return errors;
+    }
+}
diff --git a/services/src/main/java/org/onap/ccsdk/apps/services/RestException.java b/services/src/main/java/org/onap/ccsdk/apps/services/RestException.java
new file mode 100644
index 00000000..52eab71b
--- /dev/null
+++ b/services/src/main/java/org/onap/ccsdk/apps/services/RestException.java
@@ -0,0 +1,14 @@
+package org.onap.ccsdk.apps.services;
+
+abstract public class RestException extends Exception {
+    protected RestError restError;
+    protected int status;
+
+    public int getStatus() {
+        return status;
+    }
+
+    public RestError getRestError() {
+        return restError;
+    }
+}
diff --git a/services/src/main/java/org/onap/ccsdk/apps/services/RestExceptionHandler.java b/services/src/main/java/org/onap/ccsdk/apps/services/RestExceptionHandler.java
new file mode 100644
index 00000000..c517f402
--- /dev/null
+++ b/services/src/main/java/org/onap/ccsdk/apps/services/RestExceptionHandler.java
@@ -0,0 +1,131 @@
+package org.onap.ccsdk.apps.services;
+
+import org.jvnet.hk2.annotations.Service;
+import org.springframework.beans.ConversionNotSupportedException;
+import org.springframework.beans.TypeMismatchException;
+import org.springframework.core.Ordered;
+import org.springframework.core.annotation.Order;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.ResponseEntity;
+import org.springframework.http.converter.HttpMessageNotReadableException;
+import org.springframework.http.converter.HttpMessageNotWritableException;
+import org.springframework.validation.BindException;
+import org.springframework.web.HttpMediaTypeNotAcceptableException;
+import org.springframework.web.HttpMediaTypeNotSupportedException;
+import org.springframework.web.HttpRequestMethodNotSupportedException;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.MissingPathVariableException;
+import org.springframework.web.bind.MissingServletRequestParameterException;
+import org.springframework.web.bind.ServletRequestBindingException;
+import org.springframework.web.bind.annotation.ControllerAdvice;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestController;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+import org.springframework.web.context.request.WebRequest;
+import org.springframework.web.context.request.async.AsyncRequestTimeoutException;
+import org.springframework.web.multipart.support.MissingServletRequestPartException;
+import org.springframework.web.servlet.NoHandlerFoundException;
+import org.springframework.web.servlet.config.annotation.EnableWebMvc;
+import org.springframework.web.servlet.mvc.method.annotation.ResponseEntityExceptionHandler;
+
+import javax.servlet.http.HttpServletRequest;
+
+@Order(Ordered.HIGHEST_PRECEDENCE)
+@RestControllerAdvice
+public class RestExceptionHandler extends ResponseEntityExceptionHandler {
+
+    @Override
+    protected ResponseEntity<Object> handleHttpRequestMethodNotSupported(HttpRequestMethodNotSupportedException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+      return createResponseEntity(new RestProtocolError("bad-method", "Method not supported", ex), status);
+    }
+
+    @Override
+    protected ResponseEntity<Object> handleHttpMediaTypeNotSupported(HttpMediaTypeNotSupportedException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+        return createResponseEntity(new RestProtocolError("bad-media-type", "Media type not supported", ex), status);
+    }
+
+    @Override
+    protected ResponseEntity<Object> handleHttpMediaTypeNotAcceptable(HttpMediaTypeNotAcceptableException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+        return createResponseEntity(new RestProtocolError("bad-media-type", "Media type not acceptable", ex), status);
+    }
+
+    @Override
+    protected ResponseEntity<Object> handleMissingPathVariable(MissingPathVariableException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+        return createResponseEntity(new RestApplicationError("missing-path", "Missing path variable", ex), status);
+    }
+
+    @Override
+    protected ResponseEntity<Object> handleMissingServletRequestParameter(MissingServletRequestParameterException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+        return createResponseEntity(new RestProtocolError("missing-param", "Missing servlet request parameter", ex), status);
+    }
+
+    @Override
+    protected ResponseEntity<Object> handleServletRequestBindingException(ServletRequestBindingException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+        return createResponseEntity(new RestApplicationError("request-binding", "Servlet binding exception", ex), status);
+    }
+
+    @Override
+    protected ResponseEntity<Object> handleConversionNotSupported(ConversionNotSupportedException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+        return createResponseEntity(new RestApplicationError("conversion", "Conversion not supported", ex), status);
+    }
+
+    @Override
+    protected ResponseEntity<Object> handleTypeMismatch(TypeMismatchException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+        return createResponseEntity(new RestProtocolError("type-mismatch", "Type mismatch", ex), status);
+    }
+
+    @Override
+    protected ResponseEntity<Object> handleHttpMessageNotReadable(HttpMessageNotReadableException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+        return createResponseEntity(new RestProtocolError("bad-message", "HTTP message not readable", ex), status);
+    }
+
+    @Override
+    protected ResponseEntity<Object> handleHttpMessageNotWritable(HttpMessageNotWritableException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+        return createResponseEntity(new RestProtocolError("bad-message", "HTTP message not writable", ex), status);
+    }
+
+    @Override
+    protected ResponseEntity<Object> handleMethodArgumentNotValid(MethodArgumentNotValidException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+        return createResponseEntity(new RestProtocolError("bad-message", "Method argument not valid", ex), status);
+    }
+
+    @Override
+    protected ResponseEntity<Object> handleMissingServletRequestPart(MissingServletRequestPartException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+        return createResponseEntity(new RestProtocolError("bad-message", "Missing servlet request part", ex), status);
+    }
+
+    @Override
+    protected ResponseEntity<Object> handleBindException(BindException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+        return createResponseEntity(new RestApplicationError("binding-error", "Missing servlet request part", ex), status);
+    }
+
+    @Override
+    protected ResponseEntity<Object> handleNoHandlerFoundException(NoHandlerFoundException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+        return createResponseEntity(new RestApplicationError("binding-error", "No handler found", ex), status);
+    }
+
+    @Override
+    protected ResponseEntity<Object> handleAsyncRequestTimeoutException(AsyncRequestTimeoutException ex, HttpHeaders headers, HttpStatus status, WebRequest webRequest) {
+        return createResponseEntity(new RestApplicationError("timeout", "Async request timeout", ex), status);
+    }
+
+    @Override
+    protected ResponseEntity<Object> handleExceptionInternal(Exception ex, Object body, HttpHeaders headers, HttpStatus status, WebRequest request) {
+        return createResponseEntity(new RestApplicationError("internal-error", "Internal error", ex), status);
+    }
+
+    @ExceptionHandler({RestException.class})
+    protected ResponseEntity<Object> handleRestException(RestException ex, HttpServletRequest request) {
+        RestError error = ex.getRestError();
+        if (request != null) {
+            error.setErrorPath(request.getServletPath());
+        }
+        return createResponseEntity(error,HttpStatus.valueOf(ex.getStatus()));
+    }
+
+    private ResponseEntity<Object> createResponseEntity(RestError restError, HttpStatus status) {
+
+        return new ResponseEntity<>(new RestErrors(restError), status);
+    }
+}
diff --git a/services/src/main/java/org/onap/ccsdk/apps/services/RestProtocolError.java b/services/src/main/java/org/onap/ccsdk/apps/services/RestProtocolError.java
new file mode 100644
index 00000000..2e927b6a
--- /dev/null
+++ b/services/src/main/java/org/onap/ccsdk/apps/services/RestProtocolError.java
@@ -0,0 +1,30 @@
+package org.onap.ccsdk.apps.services;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonRootName;
+import com.fasterxml.jackson.annotation.JsonValue;
+
+
+@JsonRootName(value="error")
+public class RestProtocolError extends RestError {
+
+
+    public RestProtocolError() {
+        this.errorType = "protocol";
+    }
+
+    public RestProtocolError(String errorTag, String errorMessage) {
+        this.errorType = "protocol";
+        this.errorTag = errorTag;
+        this.errorMessage = errorMessage;
+        this.errorInfo = errorMessage;
+    }
+
+    public RestProtocolError(String errorTag, String errorMessage, Throwable t) {
+        this.errorType = "protocol";
+        this.errorTag = errorTag;
+        this.errorMessage = errorMessage;
+        this.errorInfo = t.getLocalizedMessage();
+    }
+
+}
diff --git a/services/src/main/java/org/onap/ccsdk/apps/services/RestProtocolException.java b/services/src/main/java/org/onap/ccsdk/apps/services/RestProtocolException.java
new file mode 100644
index 00000000..3de356bc
--- /dev/null
+++ b/services/src/main/java/org/onap/ccsdk/apps/services/RestProtocolException.java
@@ -0,0 +1,14 @@
+package org.onap.ccsdk.apps.services;
+
+public class RestProtocolException extends RestException {
+
+    public RestProtocolException(String errorTag, String errorMessage, int status) {
+        this.restError = new RestProtocolError(errorTag, errorMessage);
+        this.status = status;
+    }
+
+    public RestProtocolException(String errorTag, String errorMessage, Throwable t, int status) {
+        this.restError = new RestProtocolError(errorTag, errorMessage, t);
+        this.status = status;
+    }
+}
diff --git a/services/src/main/java/org/onap/ccsdk/apps/services/RestRpcError.java b/services/src/main/java/org/onap/ccsdk/apps/services/RestRpcError.java
new file mode 100644
index 00000000..63611d8d
--- /dev/null
+++ b/services/src/main/java/org/onap/ccsdk/apps/services/RestRpcError.java
@@ -0,0 +1,31 @@
+package org.onap.ccsdk.apps.services;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonRootName;
+import com.fasterxml.jackson.annotation.JsonValue;
+
+
+@JsonRootName(value="error")
+public class RestRpcError extends RestError {
+
+
+    public RestRpcError() {
+        this.errorType = "rpc";
+    }
+
+    public RestRpcError(String errorTag, String errorMessage) {
+        this.errorType = "rpc";
+        this.errorTag = errorTag;
+        this.errorMessage = errorMessage;
+        this.errorInfo = errorMessage;
+    }
+
+    public RestRpcError(String errorTag, String errorMessage, Throwable t) {
+        this.errorType = "rpc";
+        this.errorTag = errorTag;
+        this.errorMessage = errorMessage;
+        this.errorInfo = t.getLocalizedMessage();
+    }
+
+
+}
diff --git a/services/src/main/java/org/onap/ccsdk/apps/services/RestRpcException.java b/services/src/main/java/org/onap/ccsdk/apps/services/RestRpcException.java
new file mode 100644
index 00000000..d69f3eb4
--- /dev/null
+++ b/services/src/main/java/org/onap/ccsdk/apps/services/RestRpcException.java
@@ -0,0 +1,14 @@
+package org.onap.ccsdk.apps.services;
+
+public class RestRpcException extends RestException {
+
+    public RestRpcException(String errorTag, String errorMessage, int status) {
+        this.restError = new RestRpcError(errorTag, errorMessage);
+        this.status = status;
+    }
+
+    public RestRpcException(String errorTag, String errorMessage, Throwable t, int status) {
+        this.restError = new RestRpcError(errorTag, errorMessage, t);
+        this.status = status;
+    }
+}
diff --git a/services/src/main/java/org/onap/ccsdk/apps/services/RestTransportError.java b/services/src/main/java/org/onap/ccsdk/apps/services/RestTransportError.java
new file mode 100644
index 00000000..1fd539a6
--- /dev/null
+++ b/services/src/main/java/org/onap/ccsdk/apps/services/RestTransportError.java
@@ -0,0 +1,30 @@
+package org.onap.ccsdk.apps.services;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonRootName;
+import com.fasterxml.jackson.annotation.JsonValue;
+
+
+@JsonRootName(value = "error")
+public class RestTransportError extends RestError {
+
+
+    public RestTransportError() {
+        this.errorType = "transport";
+    }
+
+    public RestTransportError(String errorTag, String errorMessage) {
+        this.errorType = "transport";
+        this.errorTag = errorTag;
+        this.errorMessage = errorMessage;
+        this.errorInfo = errorMessage;
+    }
+
+    public RestTransportError(String errorTag, String errorMessage, Throwable t) {
+        this.errorType = "transport";
+        this.errorTag = errorTag;
+        this.errorMessage = errorMessage;
+        this.errorInfo = t.getLocalizedMessage();
+    }
+
+}
diff --git a/services/src/main/java/org/onap/ccsdk/apps/services/RestTransportException.java b/services/src/main/java/org/onap/ccsdk/apps/services/RestTransportException.java
new file mode 100644
index 00000000..971ee9b7
--- /dev/null
+++ b/services/src/main/java/org/onap/ccsdk/apps/services/RestTransportException.java
@@ -0,0 +1,14 @@
+package org.onap.ccsdk.apps.services;
+
+public class RestTransportException extends RestException {
+
+    public RestTransportException(String errorTag, String errorMessage, int status) {
+        this.restError = new RestTransportError(errorTag, errorMessage);
+        this.status = status;
+    }
+
+    public RestTransportException(String errorTag, String errorMessage, Throwable t, int status) {
+        this.restError = new RestTransportError(errorTag, errorMessage, t);
+        this.status = status;
+    }
+}
diff --git a/services/src/test/java/org/onap/ccsdk/apps/services/RestExceptionHandlerTest.java b/services/src/test/java/org/onap/ccsdk/apps/services/RestExceptionHandlerTest.java
new file mode 100644
index 00000000..242a6015
--- /dev/null
+++ b/services/src/test/java/org/onap/ccsdk/apps/services/RestExceptionHandlerTest.java
@@ -0,0 +1,362 @@
+package org.onap.ccsdk.apps.services;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import org.junit.Before;
+import org.junit.Test;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.ConversionNotSupportedException;
+import org.springframework.beans.TypeMismatchException;
+import org.springframework.core.MethodParameter;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpStatus;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.http.converter.HttpMessageNotReadableException;
+import org.springframework.http.converter.HttpMessageNotWritableException;
+import org.springframework.validation.BindException;
+import org.springframework.web.HttpMediaTypeNotAcceptableException;
+import org.springframework.web.HttpMediaTypeNotSupportedException;
+import org.springframework.web.HttpRequestMethodNotSupportedException;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.MissingPathVariableException;
+import org.springframework.web.bind.MissingServletRequestParameterException;
+import org.springframework.web.bind.ServletRequestBindingException;
+import org.springframework.web.context.request.WebRequest;
+import org.springframework.web.context.request.async.AsyncRequestTimeoutException;
+import org.springframework.web.multipart.support.MissingServletRequestPartException;
+import org.springframework.web.servlet.NoHandlerFoundException;
+
+import java.util.Arrays;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+
+
+public class RestExceptionHandlerTest {
+    private static final Logger log = LoggerFactory.getLogger("RestExceptionHandler");
+    private class RestExceptionHandlerWrapper extends RestExceptionHandler {
+        @Override
+        public  ResponseEntity<Object> handleHttpRequestMethodNotSupported(HttpRequestMethodNotSupportedException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+            return super.handleHttpRequestMethodNotSupported(ex, headers, status, request);
+        }
+
+        @Override
+        public ResponseEntity<Object> handleHttpMediaTypeNotSupported(HttpMediaTypeNotSupportedException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+            return super.handleHttpMediaTypeNotSupported(ex, headers, status, request);
+        }
+
+        @Override
+        public ResponseEntity<Object> handleHttpMediaTypeNotAcceptable(HttpMediaTypeNotAcceptableException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+            return super.handleHttpMediaTypeNotAcceptable(ex, headers, status, request);
+        }
+
+        @Override
+        protected ResponseEntity<Object> handleMissingPathVariable(MissingPathVariableException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+            return super.handleMissingPathVariable(ex, headers, status, request);
+        }
+
+        @Override
+        public ResponseEntity<Object> handleMissingServletRequestParameter(MissingServletRequestParameterException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+            return super.handleMissingServletRequestParameter(ex, headers, status, request);
+        }
+
+        @Override
+        public ResponseEntity<Object> handleServletRequestBindingException(ServletRequestBindingException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+            return super.handleServletRequestBindingException(ex, headers, status, request);
+        }
+
+        @Override
+        public ResponseEntity<Object> handleConversionNotSupported(ConversionNotSupportedException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+            return super.handleConversionNotSupported(ex, headers, status, request);
+        }
+
+        @Override
+        public ResponseEntity<Object> handleTypeMismatch(TypeMismatchException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+            return super.handleTypeMismatch(ex, headers, status, request);
+        }
+
+        @Override
+        public ResponseEntity<Object> handleHttpMessageNotReadable(HttpMessageNotReadableException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+            return super.handleHttpMessageNotReadable(ex, headers, status, request);
+        }
+
+        @Override
+        public ResponseEntity<Object> handleHttpMessageNotWritable(HttpMessageNotWritableException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+            return super.handleHttpMessageNotWritable(ex, headers, status, request);
+        }
+
+        @Override
+        public ResponseEntity<Object> handleMethodArgumentNotValid(MethodArgumentNotValidException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+            return super.handleMethodArgumentNotValid(ex, headers, status, request);
+        }
+
+        @Override
+        public ResponseEntity<Object> handleMissingServletRequestPart(MissingServletRequestPartException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+            return super.handleMissingServletRequestPart(ex, headers, status, request);
+        }
+
+        @Override
+        public ResponseEntity<Object> handleBindException(BindException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+            return super.handleBindException(ex, headers, status, request);
+        }
+
+        @Override
+        public ResponseEntity<Object> handleNoHandlerFoundException(NoHandlerFoundException ex, HttpHeaders headers, HttpStatus status, WebRequest request) {
+            return super.handleNoHandlerFoundException(ex, headers, status, request);
+        }
+
+        @Override
+        public ResponseEntity<Object> handleAsyncRequestTimeoutException(AsyncRequestTimeoutException ex, HttpHeaders headers, HttpStatus status, WebRequest webRequest) {
+            return super.handleAsyncRequestTimeoutException(ex, headers, status, webRequest);
+        }
+
+        @Override
+        public ResponseEntity<Object> handleExceptionInternal(Exception ex, Object body, HttpHeaders headers, HttpStatus status, WebRequest request) {
+            return super.handleExceptionInternal(ex, body, headers, status, request);
+        }
+    }
+
+    RestExceptionHandler handler;
+
+    @Before
+    public void setUp() {
+        handler = new RestExceptionHandlerWrapper();
+    }
+
+    @Test
+    public void handleHttpRequestMethodNotSupported() throws JsonProcessingException {
+        String[] supportedMethods = {"GET", "POST", "PUT", "DELETE"};
+
+
+        ResponseEntity<Object> respEntity = handler.handleHttpRequestMethodNotSupported(new HttpRequestMethodNotSupportedException("PATCH", supportedMethods),
+                null, HttpStatus.METHOD_NOT_ALLOWED, null);
+
+        assertTrue(respEntity.hasBody());
+        assertTrue(respEntity.getBody() instanceof RestErrors);
+
+        RestErrors restErrors = (RestErrors) respEntity.getBody();
+
+        ObjectMapper objectMapper = new ObjectMapper();
+        log.info("response : {}", objectMapper.writeValueAsString(restErrors));
+
+
+    }
+
+    @Test
+    public void handleHttpMediaTypeNotSupported() throws JsonProcessingException {
+        MediaType[] supportedMediaTypeArray = { MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML};
+
+        ResponseEntity<Object> respEntity = handler.handleHttpMediaTypeNotSupported(new HttpMediaTypeNotSupportedException(MediaType.MULTIPART_MIXED, Arrays.asList(supportedMediaTypeArray)),
+                null, HttpStatus.UNSUPPORTED_MEDIA_TYPE, null);
+
+        assertTrue(respEntity.hasBody());
+        assertTrue(respEntity.getBody() instanceof RestErrors);
+
+        RestErrors restErrors = (RestErrors) respEntity.getBody();
+        ObjectMapper objectMapper = new ObjectMapper();
+        log.info("response : {}", objectMapper.writeValueAsString(restErrors));
+    }
+
+    @Test
+    public void handleHttpMediaTypeNotAcceptable() throws JsonProcessingException {
+        MediaType[] supportedMediaTypeArray = { MediaType.APPLICATION_JSON, MediaType.APPLICATION_XML};
+
+        ResponseEntity<Object> respEntity = handler.handleHttpMediaTypeNotAcceptable(new HttpMediaTypeNotAcceptableException(Arrays.asList(supportedMediaTypeArray)),
+                null, HttpStatus.UNSUPPORTED_MEDIA_TYPE, null);
+
+        assertTrue(respEntity.hasBody());
+        assertTrue(respEntity.getBody() instanceof RestErrors);
+
+        RestErrors restErrors = (RestErrors) respEntity.getBody();
+
+        ObjectMapper objectMapper = new ObjectMapper();
+        log.info("response : {}", objectMapper.writeValueAsString(restErrors));
+
+    }
+
+    @Test
+    public void handleMissingPathVariable() throws JsonProcessingException {
+        ResponseEntity<Object> respEntity = handler.handleMissingPathVariable(new MissingPathVariableException("test", new MethodParameter(RestApplicationError.class.getDeclaredConstructors()[0],-1)),
+                null, HttpStatus.INTERNAL_SERVER_ERROR, null);
+
+        assertTrue(respEntity.hasBody());
+        assertTrue(respEntity.getBody() instanceof RestErrors);
+
+        RestErrors restErrors = (RestErrors) respEntity.getBody();
+        ObjectMapper objectMapper = new ObjectMapper();
+        log.info("response : {}", objectMapper.writeValueAsString(restErrors));
+    }
+
+    @Test
+    public void handleMissingServletRequestParameter() throws JsonProcessingException {
+        ResponseEntity<Object> respEntity = handler.handleMissingServletRequestParameter(new MissingServletRequestParameterException("test", "string"),
+                null, HttpStatus.INTERNAL_SERVER_ERROR, null);
+
+        assertTrue(respEntity.hasBody());
+        assertTrue(respEntity.getBody() instanceof RestErrors);
+
+        RestErrors restErrors = (RestErrors) respEntity.getBody();
+        ObjectMapper objectMapper = new ObjectMapper();
+        log.info("response : {}", objectMapper.writeValueAsString(restErrors));
+    }
+
+    @Test
+    public void handleServletRequestBindingException() throws JsonProcessingException {
+        ResponseEntity<Object> respEntity = handler.handleServletRequestBindingException(new ServletRequestBindingException("servlet request binding error"),
+                null, HttpStatus.INTERNAL_SERVER_ERROR, null);
+
+        assertTrue(respEntity.hasBody());
+        assertTrue(respEntity.getBody() instanceof RestErrors);
+
+        RestErrors restErrors = (RestErrors) respEntity.getBody();
+        ObjectMapper objectMapper = new ObjectMapper();
+        log.info("response : {}", objectMapper.writeValueAsString(restErrors));
+    }
+
+    @Test
+    public void handleConversionNotSupported() throws JsonProcessingException {
+        ResponseEntity<Object> respEntity = handler.handleConversionNotSupported(new ConversionNotSupportedException("hello", Integer.class, new NumberFormatException()),
+                null, HttpStatus.INTERNAL_SERVER_ERROR, null);
+
+        assertTrue(respEntity.hasBody());
+        assertTrue(respEntity.getBody() instanceof RestErrors);
+
+        RestErrors restErrors = (RestErrors) respEntity.getBody();
+        ObjectMapper objectMapper = new ObjectMapper();
+        log.info("response : {}", objectMapper.writeValueAsString(restErrors));
+    }
+
+    @Test
+    public void handleTypeMismatch() throws JsonProcessingException {
+        ResponseEntity<Object> respEntity = handler.handleTypeMismatch(new TypeMismatchException("hello", Integer.class, new NumberFormatException()),
+                null, HttpStatus.INTERNAL_SERVER_ERROR, null);
+
+        assertTrue(respEntity.hasBody());
+        assertTrue(respEntity.getBody() instanceof RestErrors);
+
+        RestErrors restErrors = (RestErrors) respEntity.getBody();
+        ObjectMapper objectMapper = new ObjectMapper();
+        log.info("response : {}", objectMapper.writeValueAsString(restErrors));
+    }
+
+    @Test
+    public void handleHttpMessageNotReadable() throws JsonProcessingException {
+        ResponseEntity<Object> respEntity = handler.handleHttpMessageNotReadable(new HttpMessageNotReadableException("Message not readable"),
+                null, HttpStatus.INTERNAL_SERVER_ERROR, null);
+
+        assertTrue(respEntity.hasBody());
+        assertTrue(respEntity.getBody() instanceof RestErrors);
+
+        RestErrors restErrors = (RestErrors) respEntity.getBody();
+        ObjectMapper objectMapper = new ObjectMapper();
+        log.info("response : {}", objectMapper.writeValueAsString(restErrors));
+    }
+
+    @Test
+    public void handleHttpMessageNotWritable() throws JsonProcessingException {
+        ResponseEntity<Object> respEntity = handler.handleHttpMessageNotWritable(new HttpMessageNotWritableException("Message not writable"),
+                null, HttpStatus.INTERNAL_SERVER_ERROR, null);
+
+        assertTrue(respEntity.hasBody());
+        assertTrue(respEntity.getBody() instanceof RestErrors);
+
+        RestErrors restErrors = (RestErrors) respEntity.getBody();
+        ObjectMapper objectMapper = new ObjectMapper();
+        log.info("response : {}", objectMapper.writeValueAsString(restErrors));
+    }
+
+    @Test
+    public void handleMethodArgumentNotValid() throws JsonProcessingException {
+        ResponseEntity<Object> respEntity = handler.handleMethodArgumentNotValid(new MethodArgumentNotValidException(new MethodParameter(RestApplicationError.class.getDeclaredConstructors()[0],-1),
+                        new BindException("target", "objectName")),
+                null, HttpStatus.INTERNAL_SERVER_ERROR, null);
+
+        assertTrue(respEntity.hasBody());
+        assertTrue(respEntity.getBody() instanceof RestErrors);
+
+        RestErrors restErrors = (RestErrors) respEntity.getBody();
+        ObjectMapper objectMapper = new ObjectMapper();
+        log.info("response : {}", objectMapper.writeValueAsString(restErrors));
+    }
+
+    @Test
+    public void handleMissingServletRequestPart() throws JsonProcessingException {
+        ResponseEntity<Object> respEntity = handler.handleMissingServletRequestPart(new MissingServletRequestPartException("test"),
+                null, HttpStatus.INTERNAL_SERVER_ERROR, null);
+
+        assertTrue(respEntity.hasBody());
+        assertTrue(respEntity.getBody() instanceof RestErrors);
+
+        RestErrors restErrors = (RestErrors) respEntity.getBody();
+        ObjectMapper objectMapper = new ObjectMapper();
+        log.info("response : {}", objectMapper.writeValueAsString(restErrors));
+    }
+
+    @Test
+    public void handleBindException() throws JsonProcessingException {
+        ResponseEntity<Object> respEntity = handler.handleBindException(new BindException("target", "objectName"),
+                null, HttpStatus.INTERNAL_SERVER_ERROR, null);
+
+        assertTrue(respEntity.hasBody());
+        assertTrue(respEntity.getBody() instanceof RestErrors);
+
+        RestErrors restErrors = (RestErrors) respEntity.getBody();
+        ObjectMapper objectMapper = new ObjectMapper();
+        log.info("response : {}", objectMapper.writeValueAsString(restErrors));
+    }
+
+    @Test
+    public void handleNoHandlerFoundException() throws JsonProcessingException {
+        ResponseEntity<Object> respEntity = handler.handleNoHandlerFoundException(new NoHandlerFoundException("GET", "restconf/bogus", null),
+                null, HttpStatus.INTERNAL_SERVER_ERROR, null);
+
+        assertTrue(respEntity.hasBody());
+        assertTrue(respEntity.getBody() instanceof RestErrors);
+
+        RestErrors restErrors = (RestErrors) respEntity.getBody();
+        ObjectMapper objectMapper = new ObjectMapper();
+        log.info("response : {}", objectMapper.writeValueAsString(restErrors));
+    }
+
+    @Test
+    public void handleAsyncRequestTimeoutException() throws JsonProcessingException {
+        ResponseEntity<Object> respEntity = handler.handleAsyncRequestTimeoutException(new AsyncRequestTimeoutException(),
+                null, HttpStatus.INTERNAL_SERVER_ERROR, null);
+
+        assertTrue(respEntity.hasBody());
+        assertTrue(respEntity.getBody() instanceof RestErrors);
+
+        RestErrors restErrors = (RestErrors) respEntity.getBody();
+        ObjectMapper objectMapper = new ObjectMapper();
+        log.info("response : {}", objectMapper.writeValueAsString(restErrors));
+    }
+
+    @Test
+    public void handleExceptionInternal() throws JsonProcessingException {
+        ResponseEntity<Object> respEntity = handler.handleExceptionInternal(new NullPointerException(), null,
+                null, HttpStatus.INTERNAL_SERVER_ERROR, null);
+
+        assertTrue(respEntity.hasBody());
+        assertTrue(respEntity.getBody() instanceof RestErrors);
+
+        RestErrors restErrors = (RestErrors) respEntity.getBody();
+        ObjectMapper objectMapper = new ObjectMapper();
+        log.info("response : {}", objectMapper.writeValueAsString(restErrors));
+    }
+
+    @Test
+    public void handleRestException() throws JsonProcessingException {
+
+        ResponseEntity<Object> respEntity = handler.handleRestException(new RestApplicationException("no-data-found", "No data found", HttpStatus.NOT_FOUND.value()), null);
+        assertTrue(respEntity.hasBody());
+        assertTrue(respEntity.getBody() instanceof RestErrors);
+
+        RestErrors restErrors = (RestErrors) respEntity.getBody();
+        ObjectMapper objectMapper = new ObjectMapper();
+        log.info("response : {}", objectMapper.writeValueAsString(restErrors));
+    }
+
+}
\ No newline at end of file
diff --git a/services/src/test/resources/log4j2-test.xml b/services/src/test/resources/log4j2-test.xml
new file mode 100644
index 00000000..1408cf2a
--- /dev/null
+++ b/services/src/test/resources/log4j2-test.xml
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Configuration status="INFO">
+    <Appenders>
+        <Console name="Console" target="SYSTEM_OUT">
+            <PatternLayout
+                    pattern="[%p] %d{yyyy-MM-dd HH:mm:ss} %c{1}:%L - %m%n"/>
+        </Console>
+    </Appenders>
+    <Loggers>
+        <Root level="info">
+            <AppenderRef ref="Console"/>
+        </Root>
+    </Loggers>
+</Configuration>
\ No newline at end of file