How to serialize JsonNode - serialization

Question

I am saving below instance to Aerospike Database.
My class which I want to serialize
public class School implements Serializable {
private static final long serialVersionUID = 1L;
private JsonNode studentInfo;
private JsonNode teacherInfo;
private void writeObject(ObjectOutputStream out) throws IOException {
ObjectMapper mapper = new ObjectMapper();
mapper.writeValue((OutputStream) out, studentInfo);
mapper.writeValue((OutputStream) out, teacherInfo);
}
private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
ObjectMapper mapper = new ObjectMapper();
this.studentInfo = mapper.readValue((InputStream) in, JsonNode.class);
this.teacherInfo = mapper.readValue((InputStream) in, JsonNode.class);
}
}
Using above code, saving to Database is working fine(Serialization).
but when I try to get data from Database(Deserialization), I am facing below exception.
Caused by: com.aerospike.client.AerospikeException$Serialize: Error -10,1,30000,0,5,BB95B2FFB6EA79A 10.66.29.66 3030: ***com.fasterxml.jackson.databind.JsonMappingException: No content to map due to end-of-input***
at [Source: java.io.ObjectInputStream#6ff29830; line: 1, column: 0]
at com.aerospike.client.command.Buffer.bytesToObject(Buffer.java:341)
at com.aerospike.client.command.Buffer.bytesToParticle(Buffer.java:69)
Please let me know if I am missing something.

Answer 1

I think we can't use ObjectOutputStream and ObjectInputStream more than one time.
I resolved it by writing writeObject and readObject function.
private void writeObject(ObjectOutputStream out) throws IOException {
ObjectMapper mapper = new ObjectMapper();
ArrayNode arrayNode = mapper.createArrayNode().add(this.studentInfo).add(this.teacherInfo);
mapper.writeValue((OutputStream) out, arrayNode);
}
private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException {
ObjectMapper mapper = new ObjectMapper();
ArrayNode arrayNode = null;
arrayNode = mapper.readValue((InputStream) in, ArrayNode.class);
this.studentInfo = arrayNode.studentInfo;
this.teacherInfo = arrayNode.teacherInfo;
}
Or you can create a POJO with 2 fields as JsonNode and serialize the POJO.