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Serializing a custom object that contains JodaTime objects in JSON

After starting the second action, which creates the object and stores it in an ArrayList inside Singleton I get this error when returning to the first Activity from the creation of the Activity .

Logcat:

 10-09 15:00:48.125: E/AndroidRuntime(4266): FATAL EXCEPTION: main 10-09 15:00:48.125: E/AndroidRuntime(4266): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.nanospark.cnc/com.nanospark.cnc.ContactCreateActivity}: java.lang.RuntimeException: Failed to invoke public org.joda.time.Chronology() with no args 10-09 15:00:48.125: E/AndroidRuntime(4266): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211) 10-09 15:00:48.125: E/AndroidRuntime(4266): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2261) 10-09 15:00:48.125: E/AndroidRuntime(4266): at android.app.ActivityThread.access$600(ActivityThread.java:141) 10-09 15:00:48.125: E/AndroidRuntime(4266): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1256) 10-09 15:00:48.125: E/AndroidRuntime(4266): at android.os.Handler.dispatchMessage(Handler.java:99) 10-09 15:00:48.125: E/AndroidRuntime(4266): at android.os.Looper.loop(Looper.java:137) 10-09 15:00:48.125: E/AndroidRuntime(4266): at android.app.ActivityThread.main(ActivityThread.java:5103) 10-09 15:00:48.125: E/AndroidRuntime(4266): at java.lang.reflect.Method.invokeNative(Native Method) 10-09 15:00:48.125: E/AndroidRuntime(4266): at java.lang.reflect.Method.invoke(Method.java:525) 10-09 15:00:48.125: E/AndroidRuntime(4266): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737) 10-09 15:00:48.125: E/AndroidRuntime(4266): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) 10-09 15:00:48.125: E/AndroidRuntime(4266): at dalvik.system.NativeStart.main(Native Method) 10-09 15:00:48.125: E/AndroidRuntime(4266): Caused by: java.lang.RuntimeException: Failed to invoke public org.joda.time.Chronology() with no args 10-09 15:00:48.125: E/AndroidRuntime(4266): at com.google.gson.internal.ConstructorConstructor$3.construct(ConstructorConstructor.java:107) 10-09 15:00:48.125: E/AndroidRuntime(4266): at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:173) 10-09 15:00:48.125: E/AndroidRuntime(4266): at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:95) 10-09 15:00:48.125: E/AndroidRuntime(4266): at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:183) 10-09 15:00:48.125: E/AndroidRuntime(4266): at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.read(ReflectiveTypeAdapterFactory.java:95) 10-09 15:00:48.125: E/AndroidRuntime(4266): at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$Adapter.read(ReflectiveTypeAdapterFactory.java:183) 10-09 15:00:48.125: E/AndroidRuntime(4266): at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.read(TypeAdapterRuntimeTypeWrapper.java:40) 10-09 15:00:48.125: E/AndroidRuntime(4266): at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:81) 10-09 15:00:48.125: E/AndroidRuntime(4266): at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.read(CollectionTypeAdapterFactory.java:60) 10-09 15:00:48.125: E/AndroidRuntime(4266): at com.google.gson.Gson.fromJson(Gson.java:805) 10-09 15:00:48.125: E/AndroidRuntime(4266): at com.google.gson.Gson.fromJson(Gson.java:770) 10-09 15:00:48.125: E/AndroidRuntime(4266): at com.google.gson.Gson.fromJson(Gson.java:719) 10-09 15:00:48.125: E/AndroidRuntime(4266): at com.nanospark.cnc.GlobalData.retrieveGlobalDataFromStorage(GlobalData.java:92) 10-09 15:00:48.125: E/AndroidRuntime(4266): at com.nanospark.cnc.ContactCreateActivity.onCreate(ContactCreateActivity.java:38) 10-09 15:00:48.125: E/AndroidRuntime(4266): at android.app.Activity.performCreate(Activity.java:5133) 10-09 15:00:48.125: E/AndroidRuntime(4266): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 10-09 15:00:48.125: E/AndroidRuntime(4266): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2175) 10-09 15:00:48.125: E/AndroidRuntime(4266): ... 11 more 10-09 15:00:48.125: E/AndroidRuntime(4266): Caused by: java.lang.InstantiationException: can't instantiate class org.joda.time.Chronology 10-09 15:00:48.125: E/AndroidRuntime(4266): at java.lang.reflect.Constructor.constructNative(Native Method) 10-09 15:00:48.125: E/AndroidRuntime(4266): at java.lang.reflect.Constructor.newInstance(Constructor.java:417) 10-09 15:00:48.125: E/AndroidRuntime(4266): at com.google.gson.internal.ConstructorConstructor$3.construct(ConstructorConstructor.java:104) 10-09 15:00:48.125: E/AndroidRuntime(4266): ... 27 more

The singleton code records the JSON:

 public void storeGlobalData(Context context){ mPrefs = context.getSharedPreferences("com.nanospark.cnc", Context.MODE_PRIVATE); preferenceEditor = mPrefs.edit(); Gson gson = new Gson(); //Transform the ArrayLists into JSON Data. String machineProfileListJSON = gson.toJson(getMachineProfileList()); String contactInfoListJSON = gson.toJson(getContactInfoList()); String eventInfoListJSON = gson.toJson(getEventInfoList()); preferenceEditor.putString("machineProfileListJSONData", machineProfileListJSON); preferenceEditor.putString("contactInfoListJSONData", contactInfoListJSON); preferenceEditor.putString("eventInfoListJSONData", eventInfoListJSON); //Commit the changes. preferenceEditor.commit(); } public void retrieveGlobalDataFromStorage(Context context){ mPrefs = context.getSharedPreferences("com.nanospark.cnc", Context.MODE_PRIVATE); if(mPrefs.contains("machineProfileListJSONData")){ Gson gson = new Gson(); String machineProfileListJSON = mPrefs.getString("machineProfileListJSONData", ""); String contactInfoListJSON = mPrefs.getString("contactInfoListJSONData", ""); String eventInfoListJSON = mPrefs.getString("eventInfoListJSONData", ""); Type machineProfileListType = new TypeToken<ArrayList<MachineProfile>>() {}.getType(); machineProfileList = (gson.fromJson(machineProfileListJSON, machineProfileListType)); Type contactInfoListType = new TypeToken<ArrayList<ContactInfo>>() {}.getType(); contactInfoList = gson.fromJson(contactInfoListJSON, contactInfoListType ); Type eventListType = new TypeToken<ArrayList<Event>>() {}.getType(); eventInfoList = gson.fromJson(eventInfoListJSON, eventListType); } }

Report event class trying to write:

  package com.nanospark.cnc; import java.util.ArrayList; import org.joda.time.LocalDate; import org.joda.time.LocalTime; public class ReportEvent extends Event { public ReportEvent(String eventTitle,String eventDescription,int assignedPin, String trackingType, LocalDate startDate, LocalDate endDate, boolean watchAllDay, LocalTime startTime, LocalTime endTime, ArrayList<String> selectedDays, ArrayList<ContactInfo> selectedContact, String formatChoice, ReportTimeSpec reportTimingConfig) { super(eventTitle,eventDescription, assignedPin, trackingType, startDate, endDate, watchAllDay, startTime, endTime, selectedDays, selectedContact, formatChoice, reportTimingConfig); // TODO Auto-generated constructor stub } }

The general event class in which the report event is displayed:

  package com.nanospark.cnc; import java.util.ArrayList; import java.util.Calendar; import org.joda.time.LocalDate; import org.joda.time.LocalTime; public class Event { String eventTitle; String eventDescription; int assignedPin; String trackingType; LocalDate startDate; LocalDate endDate; boolean watchAllDay; LocalTime startTime; LocalTime endTime; ArrayList<String> selectedDays = new ArrayList<String>(); ArrayList<ContactInfo> selectedContact = new ArrayList<ContactInfo>(); String formatChoice; ReportTimeSpec reportTimingConfigs; public Event(){ } public Event(String eventTitle, String eventDescription, int assignedPin, String trackingType, LocalDate startDate, LocalDate endDate, boolean watchAllDay, LocalTime startTime, LocalTime endTime, ArrayList<String> selectedDays, ArrayList<ContactInfo> selectedContact, String formatChoice, ReportTimeSpec reportTimingConfigs) { this.eventTitle = eventTitle; this.eventDescription = eventDescription; this.assignedPin = assignedPin; this.trackingType = trackingType; this.startDate = startDate; this.endDate = endDate; this.watchAllDay = watchAllDay; this.startTime = startTime; this.endTime = endTime; this.selectedDays = selectedDays; this.selectedContact = selectedContact; this.formatChoice = formatChoice; this.reportTimingConfigs = reportTimingConfigs; } public String getEventTitle() { return eventTitle; } public void setEventTitle(String eventTitle) { this.eventTitle = eventTitle; } public String getEventDescription() { return eventDescription; } public void setEventDescription(String eventDescription) { this.eventDescription = eventDescription; } public ReportTimeSpec getReportTimingConfigs() { return reportTimingConfigs; } public void setReportTimingConfigs(ReportTimeSpec reportTimingConfigs) { this.reportTimingConfigs = reportTimingConfigs; } public int getAssignedPin() { return assignedPin; } public void setAssignedPin(int assignedPin) { this.assignedPin = assignedPin; } public String getTrackingType() { return trackingType; } public void setTrackingType(String trackingType) { this.trackingType = trackingType; } public LocalDate getStartDate() { return startDate; } public void setStartDate(LocalDate startDate) { this.startDate = startDate; } public LocalDate getEndDate() { return endDate; } public void setEndDate(LocalDate endDate) { this.endDate = endDate; } public boolean isWatchAllDay() { return watchAllDay; } public void setWatchAllDay(boolean watchAllDay) { this.watchAllDay = watchAllDay; } public LocalTime getStartTime() { return startTime; } public void setStartTime(LocalTime startTime) { this.startTime = startTime; } public LocalTime getEndTime() { return endTime; } public void setEndTime(LocalTime endTime) { this.endTime = endTime; } public ArrayList<String> getSelectedDays() { return selectedDays; } public void setSelectedDays(ArrayList<String> selectedDays) { this.selectedDays = selectedDays; } public ArrayList<ContactInfo> getSelectedContact() { return selectedContact; } public void setSelectedContact(ArrayList<ContactInfo> selectedContact) { this.selectedContact = selectedContact; } public String getFormatChoice() { return formatChoice; } public void setFormatChoice(String formatChoice) { this.formatChoice = formatChoice; } public ReportTimeSpec getReportTimeSpec() { return reportTimingConfigs; } public void setReportTimeSpec(ReportTimeSpec reportTimingConfigs) { this.reportTimingConfigs = reportTimingConfigs; } @Override public String toString(){ return this.eventTitle; } }
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1 answer

The converters https://github.com/gkopff/gson-javatime-serialisers are for java.time classes from Java8, for example. java.time .LocalDate .

But you need converters for the org.joda.time classes from the 3rd part library. You can create custom converters for it, for example:

Converter for org.joda.time.LocalDate

 public class LocalDateSerializer implements JsonDeserializer<LocalDate>, JsonSerializer<LocalDate> { private static final DateTimeFormatter DATE_FORMAT = ISODateTimeFormat.date(); @Override public LocalDate deserialize(final JsonElement je, final Type type, final JsonDeserializationContext jdc) throws JsonParseException { final String dateAsString = je.getAsString(); if (dateAsString.length() == 0) { return null; } else { return DATE_FORMAT.parseLocalDate(dateAsString); } } @Override public JsonElement serialize(final LocalDate src, final Type typeOfSrc, final JsonSerializationContext context) { String retVal; if (src == null) { retVal = ""; } else { retVal = DATE_FORMAT.print(src); } return new JsonPrimitive(retVal); } }

Converter for org.joda.time.LocalTime

 public class LocalTimeSerializer implements JsonDeserializer<LocalTime>, JsonSerializer<LocalTime> { private static final DateTimeFormatter TIME_FORMAT = ISODateTimeFormat.timeNoMillis(); @Override public LocalTime deserialize(final JsonElement je, final Type type, final JsonDeserializationContext jdc) throws JsonParseException { final String dateAsString = je.getAsString(); if (dateAsString.length() == 0) { return null; } else { return TIME_FORMAT.parseLocalTime(dateAsString); } } @Override public JsonElement serialize(final LocalTime src, final Type typeOfSrc, final JsonSerializationContext context) { String retVal; if (src == null) { retVal = ""; } else { retVal = TIME_FORMAT.print(src); } return new JsonPrimitive(retVal); } }

Using

 public void retrieveGlobalDataFromStorage(Context context) { // ... final GsonBuilder builder = new GsonBuilder() .registerTypeAdapter(LocalDate.class, new LocalDateSerializer()) .registerTypeAdapter(LocalTime.class, new LocalTimeSerializer()); final Gson gson = builder.create(); // ...
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Source: https://habr.com/ru/post/1204361/

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