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मैं जैक्सन का उपयोग कुछ वस्तुओं में जेसन सरणी को deserialize करने के लिए कर रहा हूँ।जैक्सन त्रुटि: कोई उपयुक्त कन्स्ट्रक्टर
public class OfferContainer extends ActiveRecordBase{
public Offer offer;
public OfferContainer(){}
public OfferContainer(Database db) {
super(db);
}
@Override
public String toString()
{
return this.getID() + offer.toString();
}
public String getDescription() {
return offer.description;
}
public String getBusinessName() {
return offer.business.name;
}
public class Offer
{
public Category category;
public String description;
public String discount;
public Date expiration;
public Date published;
public String rescinded_at;
public String title;
public String hook;
public Date valid_from;
public Date valid_to;
public String id;
public Business business;
public Location location;
public String image_270x155;
public Offer() {
}
@Override
public String toString()
{
return String.format(
"[Offer: category=%1$s, description=%2$s, discount=%3$s, expiration=%4$s, published=%5$s, rescinded_at=%6$s, title=%7$s, valid_from=%8$s, valid_to=%9$s, id=%10$s, business=%11$s, location=%12$s]",
category, description, discount, expiration, published, rescinded_at, title, valid_from, valid_to, id,
business, location);
}
}
public enum Category
{
Salon, Spa, Restaurant, Other
}
// public class Category {
// public String category;
//
// public String toString() {
// return String.format("[Category: category=%1$s]", category);
// }
// }
public class Business
{
public String name;
public String phone;
public Address address;
public Business(){}
@Override
public String toString()
{
return String.format(
"[Business: name=%1$s, phone=%2$s, address=%3$s]",
name, phone, address);
}
}
public class Address
{
public String address_1;
public String address_2;
public String city;
public String cross_streets;
public String state;
public String zip;
public Address() {
}
@Override
public String toString()
{
return String.format(
"[Address: address_1=%1$s, address_2=%2$s, city=%3$s, cross_streets=%4$s, state=%5$s, zip=%6$s]",
address_1, address_2, city, cross_streets, state, zip);
}
}
public class Location {
public double latitude;
public double longitude;
public Location() {
}
public String toString() {
return String.format("[Location: longitude=%1$s, latitude=%2$s]", longitude, latitude);
}
}
}
और त्रुटि:: यहाँ मेरी कक्षा है
W/System.err(26911): org.codehaus.jackson.map.JsonMappingException: No suitable constructor found for type [simple type, class org.me.pojos.OfferContainer$Business]: can not instantiate from JSON object (need to add/enable type information?)
W/System.err(26911): at [Source: [email protected]; line: 1, column: 382] (through reference chain: org.me.pojos.OfferContainer["offer"]->org.me.pojos.Offer["business"])
W/System.err(26911): at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeFromObjectUsingNonDefault(BeanDeserializer.java:740)
W/System.err(26911): at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:683)
W/System.err(26911): at org.codehaus.jackson.map.deser.BeanDeserializer.deserialize(BeanDeserializer.java:580)
W/System.err(26911): at org.codehaus.jackson.map.deser.SettableBeanProperty.deserialize(SettableBeanProperty.java:299)
W/System.err(26911): at org.codehaus.jackson.map.deser.SettableBeanProperty$FieldProperty.deserializeAndSet(SettableBeanProperty.java:579)
W/System.err(26911): at org.codehaus.jackson.map.deser.BeanDeserializer.deserialize(BeanDeserializer.java:635)
W/System.err(26911): at org.codehaus.jackson.map.deser.SettableBeanProperty$InnerClassProperty.deserializeAndSet(SettableBeanProperty.java:780)
W/System.err(26911): at org.codehaus.jackson.map.deser.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:697)
W/System.err(26911): at org.codehaus.jackson.map.deser.BeanDeserializer.deserialize(BeanDeserializer.java:580)
W/System.err(26911): at org.codehaus.jackson.map.deser.std.ObjectArrayDeserializer.deserialize(ObjectArrayDeserializer.java:104)
W/System.err(26911): at org.codehaus.jackson.map.deser.std.ObjectArrayDeserializer.deserialize(ObjectArrayDeserializer.java:18)
W/System.err(26911): at org.codehaus.jackson.map.ObjectMapper._readMapAndClose(ObjectMapper.java:2723)
W/System.err(26911): at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1854)
W/System.err(26911): at org.me.OffersUpdater.updateOffersIfNeeded(OffersUpdater.java:107)
W/System.err(26911): at com.activities.Main$UpdateOffersTask.doInBackground(Main.java:265)
W/System.err(26911): at com.activities.Main$UpdateOffersTask.doInBackground(Main.java:239)
W/System.err(26911): at android.os.AsyncTask$2.call(AsyncTask.java:185)
W/System.err(26911): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
W/System.err(26911): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
W/System.err(26911): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
W/System.err(26911): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
W/System.err(26911): at java.lang.Thread.run(Thread.java:1019)
मैं GSON का उपयोग किया गया था, लेकिन प्रदर्शन के मुद्दों के कारण यह परित्याग करने के लिए की जरूरत है। जब मैं जैक्सन का प्रयोग किया, मैं सिर्फ सभी वर्गों, जो संभवत: अनावश्यक था करने के लिए डिफ़ॉल्ट कंस्ट्रक्टर्स जोड़ा क्योंकि वहाँ कोई अन्य कंस्ट्रक्टर परिभाषित ...
संपादित करें: ओह, और JSON इस तरह दिखता है:
[ { "offer" : { "business" : { "address" : { "address_1" : "340 9th Avenue",
"address_2" : null,
"city" : "New York",
"cross_streets" : null,
"state" : "NY",
"zip" : "10001"
},
"name" : "Blarney Stone",
"phone" : "2125024656"
},
"category" : "Restaurant",
"claim_link" : "http://m.thinknear.com/offers/BLARNEY__1323954754?app_id=kz4hjo&latitude=40.75042&longitude=-73.99633",
"description" : "$1 off all drinks This discount was authorized by Toni Rossi. ",
"discount" : null,
"distance" : 161.40291744228713,
"draws" : [ "American" ],
"expiration" : "2011-12-15T21:59:59Z",
"hook" : "$1 Off Drinks",
"id" : "BLARNEY__1323954754",
"image_270x155" : "https://s3.amazonaws.com/default_images/restaurant_stock_255x170.jpg",
"location" : { "latitude" : "40.750444",
"longitude" : "-73.99824579999999"
},
"mobile_claim_link" : "http://m.thinknear.com/offers/BLARNEY__1323954754?app_id=kz4hjo&latitude=40.75042&longitude=-73.99633",
"published" : "2011-12-15T13:12:37Z",
"rescinded_at" : null,
"title" : "$1 Off All Drinks",
"valid_from" : "2011-12-15T13:12:34Z",
"valid_to" : "2011-12-15T21:29:59Z"
} },
{ "offer" : { "business" : { "address" : { "address_1" : "252 W 31st St",
"address_2" : null,
"city" : "New York",
"cross_streets" : null,
"state" : "NY",
"zip" : "10019"
},
"name" : "Hush Spa for Men",
"phone" : "2127570508"
},
"category" : "Spa",
"claim_link" : "http://m.thinknear.com/offers/HUSH_SPA_1323962075?app_id=kz4hjo&latitude=40.75042&longitude=-73.99633",
"description" : "Use this offer now to enjoy this great Spa at a 30% discount. Applies to all services except massages. This discount was authorized by Andy Paningua. ",
"discount" : "30",
"distance" : 185.37847063528784,
"draws" : [ "Body Work",
"Facial",
"Hair Removal"
],
"expiration" : "2011-12-16T02:59:59Z",
"hook" : "30% OFF",
"id" : "HUSH_SPA_1323962075",
"image_270x155" : "https://s3.amazonaws.com/ThinkNearMobileImages/hush_255x170.jpg",
"location" : { "latitude" : "40.7499612",
"longitude" : "-73.9942143"
},
"mobile_claim_link" : "http://m.thinknear.com/offers/HUSH_SPA_1323962075?app_id=kz4hjo&latitude=40.75042&longitude=-73.99633",
"published" : "2011-12-15T15:14:36Z",
"rescinded_at" : null,
"title" : "30% off at Hush Spa for Men",
"valid_from" : "2011-12-15T15:14:35Z",
"valid_to" : "2011-12-16T02:29:59Z"
} },
{ "offer" : { "business" : { "address" : { "address_1" : "481 8th Ave",
"address_2" : "Ste 740 ",
"city" : "New York",
"cross_streets" : "34th & 35th (New Yorker Hotel)",
"state" : "NY",
"zip" : "10001"
},
"name" : "Fusion Spa",
"phone" : "+18325329272"
},
"category" : "Spa",
"claim_link" : "http://m.thinknear.com/offers/FUSION_S_1323979416?app_id=kz4hjo&latitude=40.75042&longitude=-73.99633",
"description" : "Use this offer now to enjoy this great Spa at a 20% discount. New customers only. Not valid with other offers. By appointment only. Call ahead for appointment. This discount was authorized by Tiffany Albert. ",
"discount" : "20",
"distance" : 350.0873566571568,
"draws" : [ "Facial" ],
"expiration" : "2011-12-16T01:59:59Z",
"hook" : "20% OFF",
"id" : "FUSION_S_1323979416",
"image_270x155" : "https://s3.amazonaws.com/ThinkNearMobileImages/Fusion%2BSpa+1.jpg",
"location" : { "latitude" : "40.7526135",
"longitude" : "-73.99334859999999"
},
"mobile_claim_link" : "http://m.thinknear.com/offers/FUSION_S_1323979416?app_id=kz4hjo&latitude=40.75042&longitude=-73.99633",
"published" : "2011-12-15T20:03:38Z",
"rescinded_at" : null,
"title" : "20% off at Fusion Spa",
"valid_from" : "2011-12-15T20:03:36Z",
"valid_to" : "2011-12-16T01:29:59Z"
} }
]
दूसरों ने सही ढंग से बताया है कि गैर स्थैतिक आंतरिक कक्षाएं समस्याग्रस्त हैं। हालांकि, जैक्सन 1.9.0 में वास्तव में ऐसे वर्गों के लिए कुछ समर्थन है - इसलिए यदि आप पहले के संस्करण का उपयोग कर रहे थे, तो अपग्रेड में निश्चित चीजें भी हो सकती हैं। हालांकि, यदि संभव हो तो स्थिर आंतरिक कक्षाओं का उपयोग करना अच्छा होता है ( – StaxMan