how to solve this type of stackoverflowerror...

[sanat meher]

Hi all,

I have a java program which runs repeatedly by calling to main functions in a loop based on a condition ..But after running for some time(say 30 minutes),it shows the follwing error and it terminate the program execution.But as per my requirement i want to run this program for several hours or time without showing any error and terminating the program.

Exception in thread "main" java.lang.StackOverflowError
at sun.nio.cs.StreamEncoder$CharsetSE.implWrite(Unknown Source)
at sun.nio.cs.StreamEncoder.write(Unknown Source)
at java.io.OutputStreamWriter.write(Unknown Source)
at java.io.BufferedWriter.flushBuffer(Unknown Source)
at java.io.PrintStream.write(Unknown Source)
at java.io.PrintStream.print(Unknown Source)
at java.io.PrintStream.println(Unknown Source)
at pitstop.automation1.main(automation1.java:18)
at pitstop.automation1.main(automation1.java:298)
at pitstop.automation1.main(automation1.java:298)
at pitstop.automation1.main(automation1.java:298)
at pitstop.automation1.main(automation1.java:298)
at pitstop.automation1.main(automation1.java:298)
at pitstop.automation1.main(automation1.java:298)
at pitstop.automation1.main(automation1.java:298)
at pitstop.automation1.main(automation1.java:298)
at pitstop.automation1.main(automation1.java:298)
at pitstop.automation1.main(automation1.java:298)
at pitstop.automation1.main(automation1.java:298)


Could anyone please tell me what is the exact reason for this and how to fix this error.

The code for the same program is below:

 package pitstop;

import java.io.*;  
import java.util.*;  
import java.io.Closeable;
import java.io.DataInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FilenameFilter;
import java.io.IOException;


public class automation1 {
		
	public static void main(String[] args) throws InterruptedException {  
		
		System.out.println("--");
		 String str3=null;
		String fNameOne = "D:\\textfile\\";
		File myDir=new File(fNameOne);
		//System.out.println("myDir:" +myDir);
    	FilenameFilter select=new FileListFilter("","txt");
    	File[] content=myDir.listFiles(select);
    	String  filepath=null;
    	String fName=null;
    	String fileName = null;
    	String fileName1=null;
        File dir = new File(fNameOne);
        String[] chld = dir.list();
       // System.out.println("dir length:" +chld.length );
        for(int i = 0; i < chld.length; i++){
             fileName = chld[i];
            System.out.println("Filename:"+fileName);
        }
              
        Thread t=new Thread();
    	
		t.sleep(1000);
	
		
    	//if(content!=null){
		for(int i = 0; i < chld.length; i++){
			
			 fileName1 = chld[i];
			 System.out.println("Fname:"+fNameOne);
			 System.out.println("Filename1:"+fileName1);
          //  switch(1){
           // case 1:{
            	
            	          	
            	
            	fName = fNameOne+fileName1;
            	System.out.println("Fname1:" +fName);
            	String thisLine; //string variable which take each line at a time  
            	FileInputStream fis = null;  
            	
            	 try { 
            	    	
            	        fis = new FileInputStream(fName);  
            	        
            	    } catch (FileNotFoundException e) {  
            	        // TODO Auto-generated catch block  
            	      //  e.printStackTrace();  
            	    }
            	

            	DataInputStream in = new DataInputStream(fis);
                BufferedReader br = new BufferedReader(new InputStreamReader(in));
                String strLine = null;
                String replacewith="\\";
                String strLine1=null;
               
                //Read File Line By Line
               // while (strLine  != null)   {
                try {
                	while ((strLine = br.readLine()) != null)   {

					//while ((thisLine = in.readLine()) != null)  
					  // Print the content on the console
					  System.out.println (strLine);
					  String str=strLine.substring(0,1);
					  String str1=strLine.replaceFirst(str,"" );
					  String str2=str1.replaceFirst("/", ":\\\\");
					   str3=str2.replaceAll("/","\\\\");
					  System.out.println ("str11:" +str3);
					/*  strLine=strLine.replaceAll("/d","D:");
					  System.out.println ("str:" +strLine);
					 strLine1=strLine.replaceAll("/","\\\\" );
					 System.out.println ("str11:" +strLine1);
					 */ 
				    }
                //	System.out.println("str111" +strLine1);
                	File f=new File(str3);
                	String filename=f.getName();
                	filepath=f.getParent();
                	System.out.println("filepath:" +filepath);
                	InputStream oInStream = new FileInputStream(str3);
                    OutputStream oOutStream = new FileOutputStream("D:\\pitstop\\in\\" +filename);

                    // Transfer bytes from in to out
                    byte[] oBytes = new byte[1024];
                    int nLength;
                    BufferedInputStream oBuffInputStream = new BufferedInputStream( oInStream );
                    while ((nLength = oBuffInputStream.read(oBytes)) > 0) 
                    {
                            oOutStream.write(oBytes, 0, nLength);
                    }
                    oInStream.close();
                    oOutStream.close();
                	
                    in.close();
                	} catch (IOException e) {
					// TODO Auto-generated catch block
					e.printStackTrace();
				}
              //  }
                //Close the input stream
                	Thread t1=new Thread();
                	
            		t1.sleep(1000);
                	
                	System.out.println("FileName1111:" +fName);
                  	File ff=new File(fName);
                  	System.out.println("ff" +ff);
                     boolean s=ff.delete();
                     System.out.println("s" +s);
                     if (!s) {
                    		System.out.println("File not deleted");
                    	    // File was not successfully moved
                    	}        	
                	
                	
            String fName1 = "D:\\pitstop\\out";
    		File myDir1=new File(fName1);
    		//System.out.println("myDir:" +myDir);
        	FilenameFilter select1=new FileListFilter("","pdf");
        	File[] content1=myDir1.listFiles(select1);
        	
        	File dir4 = new File(fName1);
            String[] chld4 = dir4.list();
        	System.out.println("chld4:" +chld4.length);
        	
        	
        	
        	if(chld4.length==0){
        		        		
        		String fName2 = "D:\\checkpdf\\pass\\";
        		File myDir2=new File(fName2);
        		//System.out.println("myDir:" +myDir);
            	FilenameFilter select2=new FileListFilter("","pdf");
            	File[] content2=myDir2.listFiles(select2);
            	

            	String fileName3 = null;
                File dir3 = new File(fName2);
                String[] chld1 = dir3.list();
               // System.out.println("dir length:" +chld.length );
                for(int j = 0; j < chld1.length; j++){
                     fileName3 = chld1[j];
                   // System.out.println("Filename3:" +fileName3);
                }
               // System.out.println("content2:" +content2);
                
                String fName31 = "D:\\checkpdf\\fail\\";
        		File myDir31=new File(fName31);
        		//System.out.println("myDir:" +myDir);
            	FilenameFilter select31=new FileListFilter("","pdf");
            	File[] content4=myDir31.listFiles(select31);
            	System.out.println("content4:" +content4);

            	String fileName4 = null;
                File dir51 = new File(fName31);
                String[] chld2 = dir51.list();
               // System.out.println("dir length:" +chld.length );
                for(int k = 0; k < chld2.length; k++){
                     fileName4 = chld2[k];
                  // System.out.println("Filename in fail:" +fileName4);
                }
                
                String fName5 = "D:\\checkpdf\\corrupt\\";
        		File myDir61=new File(fName5);
        		//System.out.println("myDir:" +myDir);
            	FilenameFilter select41=new FileListFilter("","pdf");
            	File[] content5=myDir61.listFiles(select41);
            	

            	String fileName5 = null;
                File dir61 = new File(fName5);
                String[] chld5 = dir61.list();
               // System.out.println("dir length:" +chld.length );
                for(int l = 0; l < chld5.length; l++){
                     fileName5 = chld5[l];
                   // System.out.println("Filename:"+fileName);
                }
                
                
        		
        		if(content2!=null){
        			
        			System.out.println("in pass");
        			
        			for(int a=0;a<chld1.length;a++){
        			
        				fileName3 = chld1[a];
        			 File file1 = new File("D:\\checkpdf\\pass\\" +fileName3 );
        			 
        			 System.out.println("File name in pass:" +fileName3);
        			 
        			    
        			    // Destination directory
        			    File dir1 = new File(filepath);
        			    
        			    // Move file to new directory
        			    boolean success = file1.renameTo(new File(dir1, file1.getName()));
        			    if (!success) {
        			    	System.out.println("File not moved from pass");
        			        // File was not successfully moved
        			    }
        			    else
          			    	System.out.println("File moved from pass");
        			}
        		
        		
        		}
        		
        		
        		 if(content4!=null){
        			 
        			System.out.println("in fail");
        			 File file2 = new File("D:\\checkpdf\\fail\\" +fileName4 );
        			 
        			 
        			 System.out.println("File name in fail:" +fileName3);
     			    
     			    // Destination directory
     			    File dir7 = new File(filepath);
     			    
     			    // Move file to new directory
     			    boolean success11 = file2.renameTo(new File(dir7, file2.getName()));
     			    if (!success11) {
     			    	
     			        // File was not successfully moved
     			    	System.out.println("File not moved from fail");
     			    }
     			   else
     			    	System.out.println("File moved from fail");
     			    
     			    
     			   

     			    
     			    
     			    
     			    
        		}
        		
        		if(content5!=null){
        			
        			 System.out.println("in corrupt");
        			 File file3 = new File("D:\\checkpdf\\corrupt\\" +fileName5 );
        			 
        			 String readme="readme.txt";
        			 
      			    
      			    // Destination directory
      			    File dir8 = new File(filepath);
      			    
      			    // Move file to new directory
      			    boolean success111 = file3.renameTo(new File(dir8, file3.getName()));
      			    if (!success111) {
      			    	System.out.println("File not moved from corrupt");
      			        // File was not successfully moved
      			    }else{
      			    	System.out.println("File moved from corrupt");
      			    
      			    
      			  try {
   			        BufferedWriter out = new BufferedWriter(new FileWriter(filepath +"\\" +readme));
   			        out.write("Invalid input file");
   			        out.close();
   			    } catch (IOException e) {
   			    }
      			    
      			    
        		}}
        		
        	}
              
                    
        //    }
           
        	
        	    

            
            
          }
		automation1.main(args);
		 
            
    	if(chld.length==0)
    	{
    		automation1.main(args);
    		
    	}
            }
	}
	
	
	


   

Here i am calling the main function again and again using automation1.main(args) at line no 299 and 304.

Please help me in this issue.


Thanks,
Sanat
>

[Ernest Friedman-Hill]

The calls to main() don't appear to be in any "loop based on a condition" -- every time main() gets to the end, it calls main() again, so eventually, you're going to get a stack overflow.

Instead of calling main() from main(), why don't you move the whole body of main() to another routine (called, say, doWhateverTheHeckThisProgramDoes()) and then in main(), just have a loop like

while (true)
    doWhateverTheHeckThisProgramDoes();

The recursion goes away, and you don't get any stack overflows.

P.S. "sleep()" is a static method of Thread; you can just call Thread.sleep(), without creating a THread object.

[sanat meher]

i got your idea.but dont understand how to implement it.Here calling to the main() is part of the body of the main() function itself.So how can we call the routine from main().
Please specify the code for the same.

Regards,
Sanat

[Campbell Ritchie]

sanat meher wrote: . . . Here calling to the main() is part of the body of the main() function itself.So how can we call the routine from main(). . . .

You don't. You will have to implement it differently.

[Ernest Friedman-Hill]

sanat meher wrote:i got your idea.but dont understand how to implement it.Here calling to the main() is part of the body of the main() function itself.So how can we call the routine from main().

As I said in my post, move almost all of main() into another routine, and then just have the loop in main(). What more do you need?