Task #3546 - Complete CreateNode endpoint implementation. Added tests:

didn't use new Mock Filter for User injection, will include it later

src/main/java/it/inaf/oats/vospace/exception/ContainerNotFoundException.java

+package it.inaf.oats.vospace.exception;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+@ResponseStatus(value = HttpStatus.NOT_FOUND)
+public class ContainerNotFoundException extends VoSpaceException {
+
+    public ContainerNotFoundException(String path) {
+        super("Container Not Found at path: " + path);
+    }
+}

src/main/java/it/inaf/oats/vospace/exception/DuplicateNodeException.java

+package it.inaf.oats.vospace.exception;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+@ResponseStatus(value = HttpStatus.CONFLICT)
+public class DuplicateNodeException extends VoSpaceException {
+
+    public DuplicateNodeException(String path) {
+        super("Duplicate Node at path: " + path);
+    }
+}

src/main/java/it/inaf/oats/vospace/exception/InvalidURIException.java

+package it.inaf.oats.vospace.exception;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+@ResponseStatus(value = HttpStatus.BAD_REQUEST)
+public class InvalidURIException extends VoSpaceException {
+
+    public InvalidURIException(String URI, String path) {
+        super("InvalidURI. Payload node URI: " + URI + 
+                " is not consistent with request path: " + path);
+    }
+    
+    public InvalidURIException(String URI)
+    {
+        super("InvalidURI. URI: "+URI+ " is not in a valid format");
+    }
+}

src/main/java/it/inaf/oats/vospace/exception/LinkFoundException.java

+package it.inaf.oats.vospace.exception;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+@ResponseStatus(value = HttpStatus.BAD_REQUEST)
+public class LinkFoundException extends VoSpaceException {
+
+    public LinkFoundException(String path) {
+        super("Link Found at path: " + path);
+    }
+}

src/main/java/it/inaf/oats/vospace/exception/PermissionDeniedException.java

+package it.inaf.oats.vospace.exception;
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+@ResponseStatus(value = HttpStatus.FORBIDDEN)
+public class PermissionDeniedException extends VoSpaceException {
+
+    public PermissionDeniedException(String path) {
+        super("Permission Denied at path: " + path);
+    }
+}