com.google.gson.JsonSyntaxException when parsing simple JSON Inputstream - aem

Question

I am getting com.google.gson.JsonSyntaxException when parsing simple JSON Inputstream
My json is this.
{
"logdata": [{
"millis": "1000",
"light": "333"
},
{
"millis": "2000",
"light": "333"
}
]
}
Java class -
import java.util.List;
public class Datalist {
private List<NavData> logdata;
/**
* #return the logdata
*/
public List<NavData> getLogdata() {
return logdata;
}
/**
* #param logdata the logdata to set
*/
public void setLogdata(List<NavData> logdata) {
this.logdata = logdata;
}
public class NavData {
private String millis;
private String light;
/**
* #return the millis
*/
public String getMillis() {
return millis;
}
/**
* #param millis the millis to set
*/
public void setMillis(String millis) {
this.millis = millis;
}
/**
* #return the light
*/
public String getLight() {
return light;
}
/**
* #param light the light to set
*/
public void setLight(String light) {
this.light = light;
}
}
Json Input Stream Reader Class - Whereas assetData is the inputStream of above json.
JsonReader reader = new JsonReader(new InputStreamReader(assetData, "UTF-8"));
Gson gson = new GsonBuilder().create();
Datalist out = gson.fromJson(reader, Datalist.class);
System.out.println(".."+out.getLogdata());

Answer 1

The problem is because you can't cast a list of string to a list with these items:
{
"millis": "1000",
"light": "333",
"temp": "78.32",
"vcc": "3.54"
}
If you want to cast to a list of these items, you need to create a class with these items and the property will be:
#Expose
private List<NavData> logdata;
Where NavData is a class with these parameters
import com.google.gson.annotations.Expose;
public class NavData {
#Expose
private String millis;
#Expose
private String light;
public String getMillis() {
return millis;
}
public void setMillis(String millis) {
this.millis = millis;
}
public String getLight() {
return light;
}
public void setLight(String light) {
this.light = light;
}
}
To read the inputStream :
StringBuilder stringBuilder = new StringBuilder();
CharBuffer charBuffer = CharBuffer.allocate(1024);
while (yourInputStream.read(charBuffer) > 0) {
charBuffer.flip();
stringBuilder.append(charBuffer.toString());
charBuffer.clear();
}
finally :
Gson gson = new GsonBuilder().enableComplexMapKeySerialization()
.excludeFieldsWithoutExposeAnnotation().serializeNulls().create();
Datalist result = gson.fromJson(stringBuilder.toString(), Datalist.class);