Possible patch some leaks

dmp-backend/web/src/main/java/eu/eudat/logic/proxy/fetching/LocalFetcher.java

@@ -22,6 +22,7 @@ public class LocalFetcher {
 		JAXBContext context = JAXBContext.newInstance(Config.class);
 		Unmarshaller unmarshaller = context.createUnmarshaller();
 		Config config = (Config) unmarshaller.unmarshal(is);
+		is.close();
 		ConfigSingle currencyConfig = config.getConfigs().stream().filter(configSingle -> configSingle.getType().equals("currency")).findFirst().get();
 
 		return retrieveData(currencyConfig);
@@ -39,7 +40,7 @@ public class LocalFetcher {
 				Unmarshaller unmarshaller = context.createUnmarshaller();
 
 				Object object = unmarshaller.unmarshal(is);
-
+				is.close();
 				Method reader = null;
 				if (configSingle.getParseField() != null && !configSingle.getParseField().isEmpty()) {
 					reader = new PropertyDescriptor(configSingle.getParseField(), aClass).getReadMethod();

dmp-backend/web/src/main/java/eu/eudat/logic/services/utilities/MailServiceImpl.java

@@ -86,6 +86,7 @@ public class MailServiceImpl implements MailService {
             InputStream inputStream = resource.getInputStream();
             StringWriter writer = new StringWriter();
             IOUtils.copy(inputStream, writer, "UTF-8");
+            inputStream.close();
             return writer.toString();
         } catch (IOException e) {
             logger.error(e.getMessage(), e);

dmp-backend/web/src/main/java/eu/eudat/models/rda/mapper/LanguageRDAMapper.java

 package eu.eudat.models.rda.mapper;
 
+import com.fasterxml.jackson.databind.ObjectMapper;
 import eu.eudat.models.rda.Language;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
-import java.io.BufferedReader;
 import java.io.IOException;
 import java.io.InputStreamReader;
 import java.nio.charset.StandardCharsets;
 import java.util.HashMap;
 import java.util.Map;
 import java.util.Objects;
-import java.util.stream.Collectors;
 
 public class LanguageRDAMapper {
 	private final static Map<String, Object> langMap = new HashMap<>();
@@ -20,9 +19,12 @@ public class LanguageRDAMapper {
 	static {
 		String json = null;
 		try {
-			json = new BufferedReader(new InputStreamReader(LanguageRDAMapper.class.getClassLoader().getResource("internal/rda-lang-map.json").openStream(), StandardCharsets.UTF_8))
-					.lines().collect(Collectors.joining("\n"));
+			ObjectMapper mapper = new ObjectMapper();
+			InputStreamReader isr = new InputStreamReader(LanguageRDAMapper.class.getClassLoader().getResource("internal/rda-lang-map.json").openStream(), StandardCharsets.UTF_8);
+			json = mapper.readValue(isr, String.class);
+			isr.close();
 			langMap.putAll(new org.json.JSONObject(json).toMap());
+
 		} catch (IOException e) {
 			logger.error(e.getMessage(), e);
 		}