Saving new Object java.lang.IllegalArgumentException: can't serialize

[MaRaVaN]

My code:

public class MongoTest {

public static void main(String[] args) {
saveObj();
}


public static void saveObj(){
Mongo mongo = null;
try {
mongo = new Mongo();
} catch (UnknownHostException | MongoException e) {
e.printStackTrace();
}
DB db = mongo.getDB("sampleDB");
DBCollection collection = db.getCollection("sampleColl");
MongoSample sample = new MongoSample();
sample.setId(new ObjectId());
sample.setField("SOmeFIELD");
sample.setData(new BasicDBObject("BASIC", "VAL"));
collection.save(new BasicDBObject("SampleENtity", sample));
System.out.println(sample);
}
}

public class MongoSample{

public ObjectId id;
public String field;
public BasicDBObject data;

public ObjectId getId() {
return id;
}

public void setId(ObjectId id) {
this.id = id;
}

public String getField() {
return field;
}

public void setField(String field) {
this.field = field;
}

public BasicDBObject getData() {
return data;
}

public void setData(BasicDBObject data) {
this.data = data;
}

}

The saveObj method throws,

Exception in thread "main" java.lang.IllegalArgumentException: can't
serialize class mongo.test.MongoSample
at org.bson.BSONEncoder._putObjectField(BSONEncoder.java:205)
at org.bson.BSONEncoder.putObject(BSONEncoder.java:121)
at org.bson.BSONEncoder.putObject(BSONEncoder.java:67)
at com.mongodb.DBApiLayer$MyCollection.insert(DBApiLayer.java:231)
at com.mongodb.DBApiLayer$MyCollection.insert(DBApiLayer.java:197)
at com.mongodb.DBCollection.insert(DBCollection.java:73)
at com.mongodb.DBCollection.save(DBCollection.java:524)
at com.mongodb.DBCollection.save(DBCollection.java:504)
at mongo.test.MongoTest.saveObj(MongoTest.java:37)
at mongo.test.MongoTest.main(MongoTest.java:18)


I even tried by implementing java.io.Serializable for MongoSample
class. Why its throwing that exception.
PS: I am in java 7. But i tried with Java 6 too. The same result.

Any suggesstions!!!


Thanks

[Nat]

It can only serialize primitive objects and object inherits from DBObject etc.

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[Tamil Vendhan]

Thanks for your reply.

But, I am not able to get it. Can you be more elaborate??!!

Did you meant that "MongoSample" should not contain objects which are
not primitive and not inherited from DBObject.

[Tamil Vendhan]

What should i do to save this Object?!

On Nov 15, 4:04 pm, "Nat" <nat.lu...@gmail.com> wrote:

[Nat]

I mean MongoSample should probably implement DBObject or you should simply use BasicDBObject.

[Tamil Vendhan]

Hi Nat,

Actually that was my first idea. I tried that earlier. But it throws,

Exception in thread "main" java.lang.NullPointerException
at com.mongodb.DBCollection._checkKeys(DBCollection.java:826)
at com.mongodb.DBCollection._checkObject(DBCollection.java:817)
at com.mongodb.DBCollection.save(DBCollection.java:516)
at com.mongodb.DBCollection.save(DBCollection.java:504)
at mongo.test.MongoTest.saveObj(MongoTest.java:41)
at mongo.test.MongoTest.main(MongoTest.java:18)

(I re generated it again, now).

The code now looks like,

public class MongoTest {

public static void main(String[] args) {
saveObj();
}

public static void saveObj() {
Mongo mongo = null;
try {
mongo = new Mongo();
} catch (UnknownHostException | MongoException e) {
e.printStackTrace();
}

DB db = mongo.getDB("sampleDB");
DBCollection collection = db.getCollection("sampleColl");

MongoSample sample = new MongoSample();

sample.put("KEY", "VAL");

collection.save(sample);
System.out.println(sample);
}
}

public class MongoSample implements DBObject {

@Override
public Object put(String key, Object v) {
// TODO Auto-generated method stub
return null;
}

@Override
public void putAll(BSONObject o) {
// TODO Auto-generated method stub

}

@Override
public void putAll(Map m) {
// TODO Auto-generated method stub

}

@Override
public Object get(String key) {
// TODO Auto-generated method stub
return null;
}

@Override
public Map toMap() {
// TODO Auto-generated method stub
return null;
}

@Override
public Object removeField(String key) {
// TODO Auto-generated method stub
return null;
}

@Override
public boolean containsKey(String s) {
// TODO Auto-generated method stub
return false;
}

@Override
public boolean containsField(String s) {
// TODO Auto-generated method stub
return false;
}

@Override
public Set<String> keySet() {
// TODO Auto-generated method stub
return null;
}

@Override
public void markAsPartialObject() {
// TODO Auto-generated method stub

}

@Override
public boolean isPartialObject() {
// TODO Auto-generated method stub
return false;

[Tamil Vendhan]

Hi Nat,
Do i need to create another post for my issue!!??

[Tamil Vendhan]

I'm extremely sorry. I totally got it. Errr.

[Scott Hernandez]

If you want to work with POJOs then you might want to take a look at
one of the mapping frameworks which support this:
http://www.mongodb.org/display/DOCS/Java+Language+Center#JavaLanguageCenter-ThirdPartyFrameworksandLibs

These will provide more natural java persistence for POJOs and beans.

[bruce yang]

you cant use http://code.google.com/p/morphia/wiki

2011/11/15 Scott Hernandez <scotthe...@gmail.com>