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Servlet.service() for servlet jsp threw exception java.lang.NullPointerException

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posted 12 years ago

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Hi Guys,

I am facing below error for my JSP page (v.jsp) kindly help, becoz it is goving me output but exception is there in logs

Why it is giving me exception NullPointerException in my JSP? Kindly provide me solution.

012-05-23 07:24:25 StandardWrapperValve[jsp]: Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
at java.io.File.<init>(File.java:180)
at org.apache.jsp.data.pc.ERCLC_005fdocs.new_005ftnb.Hyundai_0020i_002010_0020Europa.v_jsp._jspService(v_jsp.java:67)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:534)

<%@ page  language="java" import="java.util.*,java.io.*,java.lang.*" errorPage="" %>
<html>
<body>
<%@ page import="java.util.*,java.io.*,java.lang.*"%>
<%

String foldertyp = request.getParameter("foldertype");
	String fname = request.getParameter("path");
	String[] listOfFiles=null;
	String tempFileName = null;
    int len=0;
	int index;
	String fimgpth="";
	int jpgsort =0;

int bmp=0;
	int gif=0;
	int jpg=0;
	int png=0;
	int psd=0;
	int pspimage=0;
	int thm=0;
	int tif=0;
	int yuv=0;
	int JPG=0;
	  
	if(foldertyp.equals("direct1"))	
	{
	        System.out.println("direct fname===>"+fname);
			
			String[] str1=fname.split("/");
	
			String temp1=null;

int n1=str1.length;

int flag1=0;
			for(int j1=n1-3;j1<n1;j1++)
			{
				if(flag1==2) 
				{
					temp1=str1[j1];
				}							
				flag1++;						
			}	
           
			out.println("<br>");
			out.println("<center>");
			out.println("<img src=\""+temp1+"\">"+temp1);out.println("</img><br>");
			out.println("</center>");
			out.println("<br>");	
	
	}
	else 
	{
			//out.println("HIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIi");
            //System.out.println("HIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIi");

System.out.println("fname------>"+fname);
			File folder = new File(fname);

listOfFiles = folder.list();
			len=listOfFiles.length;
			int flag=0;
			String temp=null;		
			
			for(int i=0;i<len;i++)
			{
					flag=0;
					String imgpth=fname+"/"+listOfFiles[i];	
					String str1="";
					String[] str=imgpth.split("/");
					int n=str.length;
					fimgpth="";
					if(foldertyp.equals("subfolder"))	
					{
							for(int j=n-3;j<n;j++)
							{
								if(flag==2)tempFileName=str[j];
								if(flag==0) fimgpth+=str[j];
								else fimgpth+="/"+str[j];
								flag++;
								temp=str[j];
							}	
					}
					if(foldertyp.equals("currentfolder"))	
					{
							for(int j=n-3;j<n;j++)
							{
								if(flag==2) 
								{
									fimgpth+=str[j];
									temp=str[j];
									tempFileName=str[j];
									
								}							
								flag++;						
							}
					}

bmp      =          jpgsort = fimgpth.lastIndexOf(".bmp"); 
					gif      =          jpgsort = fimgpth.lastIndexOf(".gif"); 
					jpg      =          jpgsort = fimgpth.lastIndexOf(".jpg"); 
					png      =          jpgsort = fimgpth.lastIndexOf(".png"); 
					psd      =          jpgsort = fimgpth.lastIndexOf(".psd"); 
					pspimage =      jpgsort = fimgpth.lastIndexOf(".pspimage"); 
					thm      =          jpgsort = fimgpth.lastIndexOf(".thm"); 
					tif      =          jpgsort = fimgpth.lastIndexOf(".tif"); 
					yuv      =          jpgsort = fimgpth.lastIndexOf(".yuv"); 
					JPG      =          jpgsort = fimgpth.lastIndexOf(".JPG");

if(bmp>0 || gif>0  || jpg>0  || png>0  || psd>0  || pspimage>0  || thm>0  || tif>0  ||yuv>0 || JPG>0)
					{
							out.println("<br>");
							out.println("<center>");
							out.println("<table><tr><img  src=\""+fimgpth+"\">"+temp);out.println("</img></tr></table>");
							out.println("</center>");
							out.println("<br>");
					}//end if
			}//for
	}//else
	
	
%>
</body>
</html>

Bear Bibeault

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posted 12 years ago

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Priyanka Dande wrote:kindly help, becoz it is goving me output but

Please use real words when posting to the forums. Abbreviations such as "becoz" in place of "because" only serve to make your posts more difficult to read and less likely to generate useful responses.

Please click this link ⇒ UseRealWords for more information.

Why it is giving me exception NullPointerException in my JSP?

Because as pointed out in your other post on this same error you're putting Java code in a JSP and you should not be!

Somewhere in that code is a null reference that's causing the problem. Java code is a lot easier to debug when it's in a class rather than a JSP.

So again step 1 is to refactor the JSP so that it contains no Java code.

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Priyanka Dande

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Posts: 56

posted 12 years ago

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Kindly refer JAVA Code for the error

Please provide the solution

import java.io.*;
import java.util.*;
import java.sql.*;
import javax.servlet.*;
import javax.servlet.http.*;

public class ExcelDownload extends HttpServlet{

private ServletConfig config;
  
  public void init(ServletConfig config)
    throws ServletException{
     this.config=config;
     }
  public void doPost(HttpServletRequest request, HttpServletResponse response) 
              throws ServletException,IOException{
      
    PrintWriter out = response.getWriter();
   String filePath=request.getParameter("ff");
	String filetoshow=request.getParameter("f");
    response.setContentType("text/html");
    try {
       System.out.println("********************************F I L E P A T H "+filePath);
	System.out.println("********************************F I L E P A T H "+filetoshow);
	
	File f = new File (filePath);

String TypDOc = new String(filetoshow);
	
	System.out.println("TypDOc----------------------------------->"+TypDOc.lastIndexOf("."));
	String filetype=TypDOc.substring(TypDOc.lastIndexOf(".")+1,TypDOc.length());
	System.out.println("filetype----------------------------------->"+filetype);
		
	if (filetype.equals("xls")||filetype.equals("xlx") || filetype.equals("excel") ) 
		response.setContentType ("application/vnd.ms-excel");
	if (filetype.equals("ppt")||filetype.equals("pps")  )                            
		response.setContentType("application/ms-powerpoint");
	
	response.setHeader ("Content-Disposition", "attachment;filename="+filetoshow);

String name = f.getName().substring(f.getName().lastIndexOf("/") + 1,f.getName().length());

InputStream in = new FileInputStream(f);
		//ServletOutputStream outs = response.getOutputStream();
		//ServletOutputStream outs = out;

int bit = 256;
		int i = 0;
		try {
			while ((bit) >= 0) {
				bit = in.read();
				response.getWriter().write(bit);
				//outs.write(bit);
				response.getWriter().write(bit);
			}
		
		} catch (IOException ioe) {
			ioe.printStackTrace(System.out);
		}
		//outs.flush();
		//outs.close();
		in.close();	
}

Below is the Exception from the Logs

Why it is giving me exception NullPointerException in my JSP? Kindly provide me solution.

012-05-23 07:24:25 StandardWrapperValve[jsp]: Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
at java.io.File.<init>(File.java:180)
at org.apache.jsp.data.pc.ERCLC_005fdocs.new_005ftnb.Hyundai_0020i_002010_0020Europa.v_jsp._jspService(v_jsp.java:67)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:534)

Sumit Patil

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posted 12 years ago

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When you run this in the browser, you must be getting the jsp line number where it is giving NullPointerException.
What is that line number ? What code is written on that line?

Thanks & Regards, Sumeet
SCJP 1.4, SCWCD 5, LinkedIn Profile

Priyanka Dande

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Posts: 56

posted 12 years ago

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Thank you for your response ,

I am not getting any error on my browser, it is giving me output correctly rather i am getting exception on my Tomcat logs

Sumit Patil

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posted 12 years ago

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If it is giving you output correctly, what is the issue? Please explain in detail.

Thanks & Regards, Sumeet
SCJP 1.4, SCWCD 5, LinkedIn Profile

Priyanka Dande

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Posts: 56

posted 12 years ago

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This is the exception i am getting in the logs when i run the JSP/ JAVA program, i am opening Excel file in the client browser and it is getting opened in the browser but at the same time exception is coming on the logs of tomcat web server.

Below is the exception from the logs

012-05-23 07:24:25 StandardWrapperValve[jsp]: Servlet.service() for servlet jsp threw exception
java.lang.NullPointerException
at java.io.File.<init>(File.java:180)
at org.apache.jsp.data.pc.ERCLC_005fdocs.new_005ftnb.Hyundai_0020i_002010_0020Europa.v_jsp._jspService(v_jsp.java:67)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:462)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:534)

Below is the JSP Code

1. <%@ page  language="java" import="java.util.*,java.io.*,java.lang.*" errorPage="" %>  
   2. <html>  
   3. <body>  
   4. <%@ page import="java.util.*,java.io.*,java.lang.*"%>  
   5. <%  
   6.   
   7.     String foldertyp = request.getParameter("foldertype");  
   8.     String fname = request.getParameter("path");  
   9.     String[] listOfFiles=null;  
  10.     String tempFileName = null;  
  11.     int len=0;  
  12.     int index;  
  13.     String fimgpth="";  
  14.     int jpgsort =0;  
  15.   
  16.     int bmp=0;  
  17.     int gif=0;  
  18.     int jpg=0;  
  19.     int png=0;  
  20.     int psd=0;  
  21.     int pspimage=0;  
  22.     int thm=0;  
  23.     int tif=0;  
  24.     int yuv=0;  
  25.     int JPG=0;  
  26.         
  27.     if(foldertyp.equals("direct1"))   
  28.     {  
  29.             System.out.println("direct fname===>"+fname);  
  30.               
  31.             String[] str1=fname.split("/");  
  32.       
  33.             String temp1=null;  
  34.   
  35.             int n1=str1.length;  
  36.   
  37.             int flag1=0;  
  38.             for(int j1=n1-3;j1<n1;j1++)  
  39.             {  
  40.                 if(flag1==2)   
  41.                 {  
  42.                     temp1=str1[j1];  
  43.                 }                             
  44.                 flag1++;                          
  45.             }     
  46.              
  47.             out.println("<br>");  
  48.             out.println("<center>");  
  49.             out.println("<img src=\""+temp1+"\">"+temp1);out.println("</img><br>");  
  50.             out.println("</center>");  
  51.             out.println("<br>");    
  52.       
  53.     }  
  54.     else   
  55.     {  
  56.             //out.println("HIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIi");  
  57.             //System.out.println("HIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIIi");  
  58.   
  59.             System.out.println("fname------>"+fname);  
  60.             File folder = new File(fname);  
  61.   
  62.             listOfFiles = folder.list();  
  63.             len=listOfFiles.length;  
  64.             int flag=0;  
  65.             String temp=null;         
  66.               
  67.             for(int i=0;i<len;i++)  
  68.             {  
  69.                     flag=0;  
  70.                     String imgpth=fname+"/"+listOfFiles[i];   
  71.                     String str1="";  
  72.                     String[] str=imgpth.split("/");  
  73.                     int n=str.length;  
  74.                     fimgpth="";  
  75.                     if(foldertyp.equals("subfolder"))     
  76.                     {  
  77.                             for(int j=n-3;j<n;j++)  
  78.                             {  
  79.                                 if(flag==2)tempFileName=str[j];  
  80.                                 if(flag==0) fimgpth+=str[j];  
  81.                                 else fimgpth+="/"+str[j];  
  82.                                 flag++;  
  83.                                 temp=str[j];  
  84.                             }     
  85.                     }  
  86.                     if(foldertyp.equals("currentfolder"))     
  87.                     {  
  88.                             for(int j=n-3;j<n;j++)  
  89.                             {  
  90.                                 if(flag==2)   
  91.                                 {  
  92.                                     fimgpth+=str[j];  
  93.                                     temp=str[j];  
  94.                                     tempFileName=str[j];  
  95.                                       
  96.                                 }                             
  97.                                 flag++;                       
  98.                             }  
  99.                     }  
 100.   
 101.   
 102.                     bmp      =          jpgsort = fimgpth.lastIndexOf(".bmp");   
 103.                     gif      =          jpgsort = fimgpth.lastIndexOf(".gif");   
 104.                     jpg      =          jpgsort = fimgpth.lastIndexOf(".jpg");   
 105.                     png      =          jpgsort = fimgpth.lastIndexOf(".png");   
 106.                     psd      =          jpgsort = fimgpth.lastIndexOf(".psd");   
 107.                     pspimage =      jpgsort = fimgpth.lastIndexOf(".pspimage");   
 108.                     thm      =          jpgsort = fimgpth.lastIndexOf(".thm");   
 109.                     tif      =          jpgsort = fimgpth.lastIndexOf(".tif");   
 110.                     yuv      =          jpgsort = fimgpth.lastIndexOf(".yuv");   
 111.                     JPG      =          jpgsort = fimgpth.lastIndexOf(".JPG");   
 112.   
 113.                     if(bmp>0 || gif>0  || jpg>0  || png>0  || psd>0  || pspimage>0  || thm>0  || tif>0  ||yuv>0 || JPG>0)  
 114.                     {  
 115.                             out.println("<br>");  
 116.                             out.println("<center>");  
 117.                             out.println("<table><tr><img  src=\""+fimgpth+"\">"+temp);out.println("</img></tr></table>");  
 118.                             out.println("</center>");  
 119.                             out.println("<br>");  
 120.                     }//end if  
 121.             }//for  
 122.     }//else  
 123.       
 124.       
 125. %>  
 126. </body>  
 127. </html>

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