add JsonFileToObject logging

Author: duncancrawford

src/pactVerificationTest/java/uk/gov/hmcts/cp/pact/helper/JsonFileToObject.java

@@ -2,16 +2,26 @@
 
 import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import java.io.File;
+import java.util.Objects;
 
 public class JsonFileToObject {
 
+    private static final Logger LOG = LoggerFactory.getLogger(JsonFileToObject.class);
     private static final ObjectMapper mapper = new ObjectMapper()
             .registerModule(new JavaTimeModule());
 
     public static <T> T readJsonFromResources(String fileName, Class<T> clazz) throws Exception {
-        File file = new File(JsonFileToObject.class.getClassLoader().getResource(fileName).toURI());
+        File file;
+        try{
+            file = new File(Objects.requireNonNull(JsonFileToObject.class.getClassLoader().getResource(fileName)).toURI());
+        } catch (Exception e) {
+            LOG.atError().log("Error loading file: {}", fileName, e);
+            throw e;
+        }
         return mapper.readValue(file, clazz);
     }
 }