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PONotSerializableException when sending an serializable object over socket?
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copied!<p>Im trying to send a custom-made object over a socket connection. The class implements serializable but the constructor still throws a <code>NotSerializableException</code> when im trying to write the object to the socket. I'll post relevent code below:</p> <pre><code>public class serilizableArrayHolder implements Serializable { private ArrayList<Client> array= null; public serilizableArrayHolder(ArrayList<Client> array) { this.array=array; } public ArrayList<Client> getArray() { return array; } } </code></pre> <p>This is my custom-made class. For now im trying to send an arraylist from the server to the client but i'll add additional info in a later stage. The send method is posted below in my server class is posted below:</p> <pre><code>public void sendData(Socket clientSocket){ ObjectOutputStream out; try { serilizableArrayHolder temp = new serilizableArrayHolder(clientCollection); out = new ObjectOutputStream(clientSocket.getOutputStream()); out.writeObject(temp); <---This line generates the error. out.flush(); } catch (IOException e) { e.printStackTrace(); } } </code></pre> <p>This is my send-method from the server. <code>clientCollection</code> is the arrayList that im trying to send.</p> <p>The whole Client class:</p> <pre><code>public class Client implements Runnable, Serializable{ public Thread thread = new Thread(this); private Socket s; private DataInputStream in; private DataOutputStream out; private ObjectOutputStream objOut; private ServerMain server=null; private String host=null; private Client c; private String userName; public Client(Socket s, String host, ServerMain server) throws IOException{ c=this; this.host=host; this.s=s; this.server=server; this.userName=userName; in= new DataInputStream(s.getInputStream()); out=new DataOutputStream(s.getOutputStream()); objOut=new ObjectOutputStream(s.getOutputStream()); thread.start(); } public String getClientInfo(){ return host; } public String getUserName(){ return userName; } public void send(String s){ try { out.writeUTF(s); } catch (IOException e){ } } public void run() { while(true){ try { String temp = in.readUTF(); if(temp.equals("sendOnline")){ sendOnline(); } String tempHost=s.getInetAddress().getHostAddress(); server.appendString(tempHost+" Skickade: "+temp+"\n"); } catch (IOException e) { String str = s.getInetAddress().getHostName(); server.clientDisconnect(str); break; } } try { s.close(); } catch (IOException e) { } } public void sendOnline(){ serilizableArrayHolder temp = new serilizableArrayHolder(server.getClients()); try { objOut.writeObject(temp); objOut.flush(); } catch (IOException e) { e.printStackTrace(); } System.out.println("Metoden anropas"); } </code></pre> <p>}</p> <p>The new stacktrace:</p> <pre><code>java.io.NotSerializableException: java.io.DataInputStream Metoden anropas at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1180) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346) at java.util.ArrayList.writeObject(ArrayList.java:710) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:601) at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:962) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1480) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174) at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1528) at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1493) at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1416) at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1174) at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:346) at Gesäll.Client.sendOnline(Client.java:83) at Gesäll.Client.run(Client.java:58) at java.lang.Thread.run(Thread.java:722) </code></pre>

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