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I am trying to insert a whole Java object into a MongoDB Collection using Java. I am getting following error: Error : Exception in thread "main" java.lang.IllegalArgumentException: can't serialize class net.yogesh.test.Employee at org.bson.BSONEncoder._putObjectField(BSONEncoder.java:185) at org.bson.BSONEncoder.putObject(BSONEncoder.java:119) at org.bson.BSONEncoder.putObject(BSONEncoder.java:65) at com.mongodb.DBApiLayer$MyCollection.insert(DBApiLayer.java:176) at com.mongodb.DBApiLayer$MyCollection.insert(DBApiLayer.java:134) at com.mongodb.DBApiLayer$MyCollection.insert(DBApiLayer.java:129) at com.mongodb.DBCollection.save(DBCollection.java:418) at net.yogesh.test.test.main(test.java:31) Emplyoee.java (POJO) package net.yogesh.test; import java.io.Serializable; public class Employee implements Serializable { private static final long serialVersionUID = 1L; private long no; private String name; public Employee() { } public long getNo() { return no; } public void setNo(long no) { this.no = no; } public String getName() { return name; } public void setName(String name) { this.name = name; } } Main Method Class (test.java) package net.yogesh.test; import java.net.UnknownHostException; import com.mongodb.BasicDBObject; import com.mongodb.DB; import com.mongodb.DBCollection; import com.mongodb.Mongo; import com.mongodb.MongoException; public class test { public static void main(String[] args) throws UnknownHostException, MongoException { Mongo mongo = new Mongo("localhost", 27017); DB db = mongo.getDB("test"); Employee employee = new Employee(); employee.setNo(1L); employee.setName("yogesh"); BasicDBObject basicDBObject = new Basic

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