I have a Servlet that uploads an image, and saves the path in a MySQL db. I use the same code for another image upload on a different jsp page, and I get a null pointer exception on "getFileName();"
I do not see any difference in this code. Please help:
addlientimage.java
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException, ClassNotFoundException, SQLException {
response.setContentType("text/html;charset=UTF-8");
String name = request.getParameter("clientname");
String id = request.getParameter("clientid");
String password = request.getParameter("clientpassword");
String email = request.getParameter("clientemail");
final String path = getServletContext().getRealPath("/imgs");
final Part filePart = request.getPart("imageurl");
final String fileName = getFileName(filePart);
String url = "imgs/" + fileName;
OutputStream outStream;
outStream = null;
InputStream filecontent = null;
final PrintWriter writer = response.getWriter();
response.sendRedirect("clients.jsp");
try {
outStream = new FileOutputStream(new File(path + File.separator
+ fileName));
filecontent = filePart.getInputStream();
int read = 0;
final byte[] bytes = new byte[1024];
while ((read = filecontent.read(bytes)) != -1) {
outStream.write(bytes, 0, read);
}
Mysqlconnector dbconnect = new Mysqlconnector();
/* TODO output your page here. You may use following sample code. */
try (PreparedStatement clientinfo = dbconnect.getConnection().prepareStatement("INSERT INTO clients VALUES ( ?, ?, ?, ?, ? )")) {
clientinfo.setString(1, id);
//setting the first placeholder to the password recieved from the client
clientinfo.setString(2, password);
clientinfo.setString(3, name);
clientinfo.setString(4, url);
clientinfo.setString(5, email);
clientinfo.executeUpdate();
String clients = new PopulateClientsTable().getClientRows();
HttpSession session = request.getSession();
session.setAttribute("clients", clients);
}
} catch (FileNotFoundException fne) {
writer.println("You either did not specify a file to upload or are "
+ "trying to upload a file to a protected or nonexistent "
+ "location.");
writer.println("<br/> ERROR: " + fne.getMessage());
} finally {
if (outStream != null) {
outStream.close();
}
if (filecontent != null) {
filecontent.close();
}
if (writer != null) {
writer.close();
}
}
}
private String getFileName(final Part part) {
final String partHeader = part.getHeader("content-disposition");
for (String content : part.getHeader("content-disposition").split(";")) {
if (content.trim().startsWith("filename")) {
return content.substring(
content.indexOf('=') + 1).trim().replace("\"", "");
}
}
return null;
}
addmanager.java
response.setContentType("text/html;charset=UTF-8");
String personName = request.getParameter("mediapersonname");
String productName = request.getParameter("productname");
String mediainfoid = request.getParameter("mediainfoid");
String mediaAbout = request.getParameter("mediaabout");
String personAbout = request.getParameter("personabout");
String productAbout = request.getParameter("productabout");
final String path = getServletContext().getRealPath("/imgs");
final Part filePart = request.getPart("personurl");
final String fileName = getFileName(filePart);
String url = "imgs/" + fileName;
OutputStream outStream;
outStream = null;
InputStream filecontent = null;
final PrintWriter writer = response.getWriter();
response.sendRedirect("adminmediainfo.jsp");
try {
outStream = new FileOutputStream(new File(path + File.separator
+ fileName));
filecontent = filePart.getInputStream();
int read = 0;
final byte[] bytes = new byte[1024];
while ((read = filecontent.read(bytes)) != -1) {
outStream.write(bytes, 0, read);
}
Mysqlconnector dbconnect = new Mysqlconnector();
/* TODO output your page here. You may use following sample code. */
try (PreparedStatement clientinfo = dbconnect.getConnection().prepareStatement("INSERT INTO mediainfo VALUES ( ?, ?, ?, ?, ?, ?, ? )")) {
//setting the first placeholder to the password recieved from the client
clientinfo.setString(1, mediainfoid);
clientinfo.setString(2, mediaAbout);
clientinfo.setString(3, personName);
clientinfo.setString(4, productName);
clientinfo.setString(5, productAbout);
clientinfo.setString(6, personAbout);
clientinfo.setString(7, url);
clientinfo.executeUpdate();
String clients = new PopulateMediaInfoTable().getClientRows();
HttpSession session = request.getSession();
session.setAttribute("mediainfo", clients);
}
} catch (FileNotFoundException fne) {
writer.println("You either did not specify a file to upload or are "
+ "trying to upload a file to a protected or nonexistent "
+ "location.");
writer.println("<br/> ERROR: " + fne.getMessage());
} finally {
if (outStream != null) {
outStream.close();
}
if (filecontent != null) {
filecontent.close();
}
if (writer != null) {
writer.close();
}
}
}
private String getFileName(final Part part) {
final String partHeader = part.getHeader("content-disposition");
for (String content : part.getHeader("content-disposition").split(";")) {
if (content.trim().startsWith("filename")) {
return content.substring(
content.indexOf('=') + 1).trim().replace("\"", "");
}
}
return null;
}
The code for addclientimage.java works. The code for addmanager.java does not.
ERROR LOG
type Exception report
message
description The server encountered an internal error that prevented it from fulfilling this request.
exception
java.lang.NullPointerException
AddMediaInfo.getFileName(AddMediaInfo.java:115)
AddMediaInfo.processRequest(AddMediaInfo.java:53)
AddMediaInfo.doPost(AddMediaInfo.java:158)
javax.servlet.http.HttpServlet.service(HttpServlet.java:644)
javax.servlet.http.HttpServlet.service(HttpServlet.java:725)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:393)
note The full stack trace of the root cause is available in the Apache Tomcat/8.0.15 logs.
