Exception in thread main: java.lang.NullPointerException
Hello all,
I wrote a java program and I get a null pointer exception for this line:
for(int tmp=0;tmp<4;tmp++)
allservers[tmp].setindex(tmp);// Null pointer exception.
The line in main is this: (It calls a constructor which will be shown)
ServerMonitor shopservers = new ServerMonitor();
The allservers is synchronised within the following class:
This was within the constructor of the following class:
class ServerMonitor
{
boolean[] serverstates;
public Server[] allservers;
public ServerMonitor() // CONSTRUCTOR Here is the exception
{
serverstates = new boolean[4];
allservers = new Server[4];
for(int tmp=0;tmp<4;tmp++)
serverstates[tmp]=false;
for(int tmp=0;tmp<4;tmp++)
allservers[tmp].setindex(tmp);//NULL POINTER EXCEPTION
}
Also this is the class Server: (part of it)
class Server extends Thread
{
public int myindex;
public ServerMonitor monitor;
public StatusMonitor statmon;
public Server()
{
myindex=0;
}
public void setindex(int index)
{
myindex=index;
}
I would appreciate any help.
Thank you,
Nikos
