java - Cannot find generated file : FileOutPutStream -

i working on persistence of java project (media player). supposed save added files , load them if user re-opens program.

i using library purpose, store tracks/concerts/albums added user :

import java.io.serializable; import java.util.list;  public class musiclibrary implements displayable, serializable { private static musiclibrary reference; public static genericlist<singletrack> alltracks; public static genericlist<album> allalbums; public static genericlist<concert> allconcerts; public static genericlist<artist> allartists;  /**private constructor keep users instantiating class more once*/ private musiclibrary(){     alltracks = new genericlist<singletrack>();     allalbums = new genericlist<album>();     allconcerts = new genericlist<concert>();     allartists = new genericlist<artist>();  }  /**method makes sure class instantiated once*/ public static musiclibrary getlibrary(){     if(reference == null)         reference = new musiclibrary();      return reference;  } public void addtrack(singletrack musictrack){     alltracks.add(musictrack); } public void addalbum(album album){     allalbums.add(album); } public void addconcert(concert concert){     allconcerts.add(concert); } public void addartist(artist artist){     allartists.add(artist); }  public singletrack[] gettracks(){      return (singletrack[]) alltracks.toarray();  }  /*public string displaytracks(){     return alltracks.displaylist(); }*/   public string gettitle() {     return null; }   public string fordisplay() {         return null; }  public string getname(){     return null; }  public static class getlibrary {      public getlibrary() {     } } } 

then have class called persistentlibrary manage persistence of library (i.e: save library , load back) :

package dj2.persistence;  import java.io.dataoutputstream; import java.io.fileinputstream; import java.io.fileoutputstream; import java.io.ioexception; import java.io.objectinputstream; import java.io.objectoutputstream;  import dj2.core.*;  public class persistentmusiclibrary {      private static string librarystore = "library.ser";     private static musiclibrary library;     private static objectinputstream libraryin;     private static objectoutputstream libraryout;      private persistentmusiclibrary(){         //don't let instantiate me     }      public static musiclibrary getinstance(){         if(library == null){             try{                 system.out.print("1");                 libraryin = new objectinputstream(new fileinputstream(librarystore));                 library = (musiclibrary)libraryin.readobject();                 libraryin.close();             }catch(exception ex){                 library = musiclibrary.getlibrary();             }         }         return library;     }       public static void savelibrary()throws ioexception {         if(library == null)             return;             //system.out.println("you not null");         libraryout = new objectoutputstream(new               fileoutputstream(librarystore));         libraryout.writeobject(library);         libraryout.close();     }  } 

the problem save method doesn't seem work, since can't find generated file on computer, , doesn't throw exception either. call in actionlistener of menuitem "save" :

menufilesave.addactionlistener(new actionlistener(){          public void actionperformed(actionevent ae){      try{         persistentmusiclibrary.savelibrary();       }catch(ioexception ioe){           system.out.println("fail save");       }     }}); 

can me debugg please?