Unknown Source

[Suraj Savaratkar]

When im going to save the file given target path its getting fails to load a file name and server thrown an NullPointerException as well
as java.io.FileInputStream.<init>(Unknown Source) it Exceptions. It unable to catch a File Name

My code is was written like this,

static public void saveFile(File uploadedFile, String fileName, String systemPath) throws IOException
{		
        FileInputStream in = null;
        FileOutputStream out = null;       
        File anotherPath = uploadedFile;               
        String directoryName = systemPath;
        File dir = new File ( directoryName);
        if (!dir.exists()){dir.mkdirs();}
        String targetPath =  dir.getPath() + File.separator + fileName;
        System.out.println("Stored file to " + targetPath);
        
        File picDestination = new File (targetPath);
        
        try 
        {
           [b] in = new FileInputStream(anotherPath);[/b]			
            out = new FileOutputStream(picDestination);
            int c;
            while ((c = in.read()) != -1)
            {
	out.write(c);
             }
         }	
}

Server thrown an Excetopn to above bold line what is the reason to thrown such exception i really was not getting. If have any
proper solution on that.

Exception is;

Stored file to D:\Monitors\null
Jul 14, 2010 1:46:58 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet default threw exception
java.lang.NullPointerException
at java.io.FileInputStream.<init>(Unknown Source)
at com.save.SaveFile.saveFile(SaveFile.java:29)
at com.kogent.action.FileActionUpload.uploadFile(FileActionUpload.java:18)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeAction(DefaultActionInvocation.java:399)
at com.opensymphony.xwork2.DefaultActionInvocation.invokeActionOnly(DefaultActionInvocation.java:262)
at com.opensymphony.xwork2.DefaultActionInvocation.invoke(DefaultActionInvocation.java:224)
at com.opensymphony.xwork2.interceptor.DefaultWorkflowInterceptor.doIntercept(DefaultWorkflowInterceptor.java:213)
at com.opensymphony.xwork2.interceptor.MethodFilterInterceptor.intercept(MethodFilterInterceptor.java:86)
at com.opensymphony.xwork2.DefaultActionInvocation$2.doProfiling(DefaultActionInvocation.java:219)

[Hardik N Shah]

Hi i have tried out your method with this program and working fine for me.

   
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class TestFileUpload {

	public static void main(String[] args) {

		try {
			saveFile(new File("E:\\111.txt"),"TestFile" , "E:\\");
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		
	}

	static public void saveFile(File uploadedFile, String fileName,
			String systemPath) throws IOException {
		FileInputStream in = null;
		FileOutputStream out = null;
		File anotherPath = uploadedFile;
		String directoryName = systemPath;
		File dir = new File(directoryName);
		if (!dir.exists()) {
			dir.mkdirs();
		}
		String targetPath = dir.getPath() + File.separator + fileName;
		System.out.println("Stored file to " + targetPath);

		File picDestination = new File(targetPath);

		try {
			in = new FileInputStream(anotherPath);
			out = new FileOutputStream(picDestination);
			int c;
			while ((c = in.read()) != -1) {
				out.write(c);
			}

		} catch (Exception e) {
			e.printStackTrace();
		}
	}
}

 

[David Newton]

The error is a logic error, somewhere around


at com.save.SaveFile.saveFile(SaveFile.java:29)
at com.kogent.action.FileActionUpload.uploadFile(FileActionUpload.java:18)

but without knowing what's actually happening on and around those lines, it's impossible to help. Most likely something is null (like the exception says) that you believe isn't null.