Added code that sends report to minervanet

rest-api/src/main/java/lcsb/mapviewer/api/minervanet/MinervaNetController.java

 package lcsb.mapviewer.api.minervanet;
 
+import com.fasterxml.jackson.databind.ObjectMapper;
 import lcsb.mapviewer.model.user.ConfigurationElementType;
 import lcsb.mapviewer.services.interfaces.IConfigurationService;
-import org.apache.http.client.HttpClient;
 import org.apache.http.client.methods.HttpPost;
+import org.apache.http.entity.StringEntity;
+import org.apache.http.impl.client.CloseableHttpClient;
 import org.apache.http.impl.client.HttpClients;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.web.bind.annotation.*;
 
+import java.io.IOException;
+
 @RestController
 @RequestMapping("/minervanet")
 public class MinervaNetController {
 
   private IConfigurationService configurationService;
-  private static HttpClient httpClient = HttpClients.createDefault();
 
   @Autowired
   public MinervaNetController(IConfigurationService configurationService) {
@@ -21,9 +24,16 @@ public class MinervaNetController {
   }
 
   @PostMapping(value = "/submitError")
-  public void submitError(@RequestBody ErrorReport report) {
+  public void submitError(@RequestBody ErrorReport report) throws IOException {
+    ObjectMapper mapper = new ObjectMapper();
+    String jsonReport = mapper.writeValueAsString(report);
     String server = configurationService.getValue(ConfigurationElementType.MINERVANET_URL).getValue();
     HttpPost httpPost = new HttpPost(server);
+    httpPost.setHeader("Content-Type", "application/json");
+    httpPost.setEntity(new StringEntity(jsonReport));
+    try (CloseableHttpClient httpClient = HttpClients.createDefault()) {
+      httpClient.execute(httpPost);
+    }
   }
 
 }