Ejemplo

public static void main(String[] args){
Object lock = new Object();

for ( int i = 0; i < args.length; i++ ) {
synchronized ( lock ) {
System.out.println( args[ i ] );
}
}
}

Solución
Saque los bloques sincronizados del bucle.

public static void main(String[] args){
Object lock = new Object();

synchronized ( lock ) {
for ( int i = 0; i < args.length; i++ ) {
System.out.println( args[ i ] );
}
}
}