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- 04-09-2012, 08:06 PM #1
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XMLEncoder: discarding statement ArrayList.add
I am trying to serialize an object that contains an ArrayList as part of the object. However, I keep getting an error:
Java Code:Writing Race java.lang.InstantiationException: com.longswordllc.testEncoder.structs$Car Continuing ... java.lang.Exception: XMLEncoder: discarding statement ArrayList.add(structs$Car); Continuing ...
structs.java
Java Code:package com.longswordllc.testEncoder; public class structs { public structs() { } public class Car { private String color; public Car() { color = null; } public String getColor() { return color; } public void setColor(String c) { color = c; } } }
Java Code:package com.longswordllc.testEncoder; import java.util.ArrayList; import com.longswordllc.testEncoder.structs.Car; public class Race { private ArrayList<Car> texasRace; public Race() { } public ArrayList<Car> getRace() { return texasRace; } public void setRace(ArrayList<Car> a) { texasRace = a; } }
Java Code:package com.longswordllc.testEncoder; import java.beans.XMLEncoder; import java.io.BufferedOutputStream; import java.io.FileOutputStream; import java.io.IOException; import java.util.ArrayList; import com.longswordllc.testEncoder.structs.*; public class mainClass { public static void main(String[] args) { structs myStructs = new structs(); Race myRace = new Race(); Car myCar = myStructs.new Car(); myCar.setColor("Blue"); ArrayList<Car> someCars = new ArrayList<Car>(); someCars.add(myCar); myRace.setRace(someCars); System.out.println("Writing Race"); // XML Encode the race object try { XMLEncoder encoder = new XMLEncoder(new BufferedOutputStream( new FileOutputStream("race.xml"))); encoder.writeObject(myRace); encoder.close(); } catch (IOException e) { e.printStackTrace(); } } }
Java Code:<?xml version="1.0" encoding="UTF-8"?> -<java class="java.beans.XMLDecoder" version="1.6.0_31"> -<object class="com.longswordllc.testEncoder.Race"> -<void property="race"> <object class="java.util.ArrayList"/> </void> </object> </java>
I am still kind of new to serializing. Thanks in advance for any help. I have been stumped for days.
- 04-09-2012, 10:54 PM #2
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Re: XMLEncoder: discarding statement ArrayList.add
I fixed it! I had to get rid of the structs class and make it the race class. Then pull the Car class into it's own class file. a few changes to the mainClass and it work. Here is updated code that shows how to make it work. Not sure why it works, though. Im still a new guy to java.
Car Class
Java Code:package com.longswordllc.testEncoder; public class Car{ private String color; public String getColor() { return color; } public void setColor(String c) { color = c; } }
Java Code:package com.longswordllc.testEncoder; import java.util.List; public class Race { private List<Car> myCars; public List<Car> getCars() { return myCars; } public void setCars(List<Car> data) { myCars = data; } }
mainClass class
Java Code:package com.longswordllc.testEncoder; import java.beans.XMLEncoder; import java.io.BufferedOutputStream; import java.io.FileOutputStream; import java.io.IOException; import java.util.ArrayList; import java.util.List; public class mainClass { public static void main(String[] args) { Car myCar = new Car(); myCar.setColor("Blue"); Car aCar = new Car(); aCar.setColor("Red"); List<Car> texasRace = new ArrayList<Car>(); texasRace.add(myCar); texasRace.add(aCar); Race myRace = new Race(); myRace.setCars(texasRace); System.out.println("Writing Race"); // XML Encode the race object try { XMLEncoder encoder = new XMLEncoder(new BufferedOutputStream( new FileOutputStream("race.xml"))); encoder.writeObject(texasRace); encoder.close(); } catch (IOException e) { e.printStackTrace(); } } }
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