file - java.io.StreamCorruptedException: Wrong format: ac error android -

i writing serialized objects file , reading after in android. getting " java.io.streamcorruptedexception: wrong format: ac " error while reading second object file. below code writing object file.

public void writetobinary (string filename, object obj, boolean append){     file = new file ("myschedule");      try{         if (!append) { out = new objectoutputstream (getcontext().openfileoutput(filename,context.mode_private)); }         else { out = new appendableobjectoutputstream (getcontext().openfileoutput(filename, context.mode_append)); }      //   toast.maketext(getactivity().getapplicationcontext(), "starting add file", toast.length_short).show();         out.writeobject(obj);         out.flush();         toast.maketext(getactivity().getapplicationcontext(), "added file", toast.length_short).show();     }catch (exception e){         e.printstacktrace ();        // toast.maketext(getactivity().getapplicationcontext(), "exception file", toast.length_short).show();     }finally{         try{             if (out != null) out.close ();           //  toast.maketext(getactivity().getapplicationcontext(), "close file", toast.length_short).show();         }catch (exception e){             e.printstacktrace ();         }     } }  private static class appendableobjectoutputstream extends objectoutputstream {     public appendableobjectoutputstream(outputstream out) throws ioexception {         super(out);     }     @override     protected void writestreamheader() throws ioexception {} } 

i calling method using below line of code,every time user clicks on button , writing object file.method called , object saved many times user clicks on button.

       if(mainactivity.firsttime) {             writetobinary("myschedule", schedulebeans, false);             mainactivity.firsttime=false;         } else {                 writetobinary("myschedule", schedulebeans, true);         } 

here,schedulebeans object of class implements serializable. mainactivity.firsttime public static boolean variable defined in activity , used flag.

now reading file using below code.

    objectinputstream ois = null;         try {             ois = new objectinputstream(getcontext().openfileinput("myschedule"));            toast.maketext(getactivity().getapplicationcontext(), "file opened", toast.length_short).show();             while (true) {                 arraylist.add((schedulebeans) ois.readobject());                 toast.maketext(getactivity().getapplicationcontext(), "read file", toast.length_short).show();             }          } catch (eofexception e) {             toast.maketext(getactivity().getapplicationcontext(), "exception end of file", toast.length_short).show();          } catch (exception e) {             e.printstacktrace();             toast.maketext(getactivity().getapplicationcontext(), "exception opening file", toast.length_short).show();         } {             try {                 if (ois != null) {                     ois.close();                  //   toast.maketext(getactivity().getapplicationcontext(), "closing file", toast.length_short).show();                 }             } catch (ioexception e) {                 e.printstacktrace();                // toast.maketext(getactivity().getapplicationcontext(), "exception in closing file", toast.length_short).show();             }         } 

i getting error "java.io.streamcorruptedexception: wrong format: ac" while reading second object file in case file has more 1 objects in it.

can please tell should change in code read objects in file successfully?

update-- issue resolved. above code in question edited solved working code.

you're using mode_append in both cases, including case when you're not supposed appending file.

you should use in other case.