#17 Bug Mismatchexception fixed

src/main/java/ch/zhaw/gartenverwaltung/io/JsonTaskDatabase.java

@@ -9,6 +9,7 @@ import com.fasterxml.jackson.datatype.jsr310.ser.LocalDateSerializer;
 
 import java.io.File;
 import java.io.IOException;
+import java.net.URISyntaxException;
 import java.net.URL;
 import java.time.LocalDate;
 import java.time.format.DateTimeFormatter;
@@ -25,6 +26,7 @@ import java.util.Map;
 public class JsonTaskDatabase implements TaskDatabase{
     IdProvider idProvider;
     private final URL dataSource = getClass().getResource("taskdb.json");
+    private final static String INVALID_DATASOURCE_MSG = "Invalid datasource specified!";
 
     private Map<Long, Task> taskMap = Collections.emptyMap();
 
@@ -99,12 +101,16 @@ public class JsonTaskDatabase implements TaskDatabase{
      * @throws IOException If the database cannot be accessed
      */
     private void writeTaskListToFile() throws IOException {
-        ObjectMapper mapper = new ObjectMapper();
-        mapper.registerModule(timeModule)
-                .registerModule(new Jdk8Module());
-
         if(dataSource != null) {
-            mapper.writeValue(new File(dataSource.getFile()), taskMap);
+            try {
+                new ObjectMapper()
+                        .registerModule(timeModule)
+                        .registerModule(new Jdk8Module())
+                        .writeValue(new File(dataSource.toURI()), taskMap.values());
+
+            } catch (URISyntaxException e) {
+                throw new IOException(INVALID_DATASOURCE_MSG, e);
+            }
         }
     }
 
@@ -116,7 +122,8 @@ public class JsonTaskDatabase implements TaskDatabase{
     private void loadTaskListFromFile() throws IOException {
         if (dataSource != null) {
             ObjectMapper mapper = new ObjectMapper();
-            mapper.registerModule(timeModule);
+            mapper.registerModule(timeModule)
+                    .registerModule(new Jdk8Module());
 
             List<Task> result;
             result = mapper.readerForListOf(Task.class).readValue(dataSource);