Tomcat ошибка 500

I am creating simple servlet and deploying it in tomcat server but I am getting the following error:

HTTP Status 500 — Error instantiating servlet class pkg.coreServlet

File Structure on the tomcat server:

webapps     
| 
- aarya
  |
  - WEB-INF
    |
     -web.xml
     -src(folder)
       |
       -pkg
         |
         -coreServlet.class

web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">


<servlet>
    <servlet-name>aaryaservlet</servlet-name>
    <servlet-class>pkg.coreServlet</servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>aaryaservlet</servlet-name>
        <url-pattern>/coreServlet</url-pattern>
    </servlet-mapping>
</web-app>

coreServlet.java:

package pkg;

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

public class coreServlet extends HttpServlet
{
    /**
     * 
     */
    private static final long serialVersionUID = 1L;

public void doGet(HttpServletRequest req,HttpServletResponse res)
 throws ServletException,IOException


   {
        PrintWriter out = res.getWriter();
        res.setContentType("text/html");
        out.println("this is First servlet Example ");
    }
}

url I am giving is http://localhost:8080/aarya/coreServlet
I try by restarting tomcat but I am getting same error. Where I am doing wrong?

I am creating simple servlet and deploying it in tomcat server but I am getting the following error:

HTTP Status 500 — Error instantiating servlet class pkg.coreServlet

File Structure on the tomcat server:

webapps     
| 
- aarya
  |
  - WEB-INF
    |
     -web.xml
     -src(folder)
       |
       -pkg
         |
         -coreServlet.class

web.xml:

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">


<servlet>
    <servlet-name>aaryaservlet</servlet-name>
    <servlet-class>pkg.coreServlet</servlet-class>
</servlet>

<servlet-mapping>
    <servlet-name>aaryaservlet</servlet-name>
        <url-pattern>/coreServlet</url-pattern>
    </servlet-mapping>
</web-app>

coreServlet.java:

package pkg;

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

public class coreServlet extends HttpServlet
{
    /**
     * 
     */
    private static final long serialVersionUID = 1L;

public void doGet(HttpServletRequest req,HttpServletResponse res)
 throws ServletException,IOException


   {
        PrintWriter out = res.getWriter();
        res.setContentType("text/html");
        out.println("this is First servlet Example ");
    }
}

url I am giving is http://localhost:8080/aarya/coreServlet
I try by restarting tomcat but I am getting same error. Where I am doing wrong?

I am getting the following error on Tomcat.
The code is given below

message Servlet execution threw an exception

description The server encountered an internal error that prevented it from fulfilling this request.

exception

javax.servlet.ServletException: Servlet execution threw an exception
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause

java.lang.NoClassDefFoundError: net/sf/ezmorph/Morpher
    DBChart.doGet(DBChart.java:68)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause

java.lang.ClassNotFoundException: net.sf.ezmorph.Morpher
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1702)
    org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1547)
    DBChart.doGet(DBChart.java:68)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)

Below is my Java file

//imported all the required packages here   
class DBChart extends HttpServlet
{

    Connection c = null;
    Statement st = null;
    ResultSet rs = null;
    String query = null;
    JSONObject obj = null;
    JSONObject resobj = null;
    PreparedStatement pst = null;
    DatabaseMetaData dbmd = null;
    String dbURL = "jdbc:sqlserver://localhost:1433; databaseName = EMPLOYEE";
    String user = "username";
    String password = "mypassword";

    public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        try
        {
            List<JSONObject> Details = new LinkedList<JSONObject>();
            PrintWriter out = response.getWriter();
            Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
            c = DriverManager.getConnection(dbURL, user, password);
            query = " select DeptName, NumberOfEmployess from Departments";
            pst = c.prepareStatement(query);
            rs = pst.executeQuery();
            while (rs.next())
            {
                String dept = rs.getString(1);
                int empnumber = rs.getInt(2);
                obj = new JSONObject();
                obj.put("DepartmentName", dept);
                obj.put("EmployeesinNumbers", empnumber);
                Details.add(obj);
            }
            resobj.put("RelativeDetails", Details);
            out.write(resobj.toString());

        }
        catch (Exception e)
        {
            System.out.println("Exception " + e);
        }
    }

    public void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
    {
        doGet(request, response);
    }
}

I made sure that I have mentioned the correct name in XMl file and using the url as follows:

http://localhost:8080/DBCHART/db 

Unable to hit webservice on tomcat getting 500 error Solution

In this session, we’ll try our hand at solving the Unable to hit webservice on tomcat getting 500 error Solution puzzle by using the computer language. The code that follows serves to illustrate this point.

<init-param>
  <param-name>com.sun.jersey.config.property.packages</param-name>
  <param-value>RESTFULWebService</param-value>
</init-param>

The identical issue Unable to hit webservice on tomcat getting 500 error Solution can be resolved using a different strategy, which is described in the section below with code samples.

<init-param>
  <param-name>com.sun.jersey.config.property.packages</param-name>
  <param-value>com.packages.restful</param-value>
</init-param>

We have shown how to address the Unable to hit webservice on tomcat getting 500 error Solution problem by looking at a number of different cases.

What is HTTP Status 500 error in Tomcat?

HTTP Status 500 – Internal Server Error Description The server encountered an unexpected condition that prevented it from fulfilling the request.16-Jun-2021

How do I fix request failed with status code 500?

How to Fix a 500 Error

• Reload the web page.
• Clear your browser’s cache.
• Delete your browser’s cookies.
• Troubleshoot as a 504 Gateway Timeout error instead.
• Contacting the website is another option.
• Come back later.

What causes HTTP 500 error?

The HTTP status code 500 is a generic error response. It means that the server encountered an unexpected condition that prevented it from fulfilling the request. This error is usually returned by the server when no other error code is suitable.

How do I fix Tomcat error?

Resolution:

• Check current Java version by opening command prompt and executing «Java -version»
• Open Tomcat Configuration via Tomcat7w.exe (Configure Tomcat)
• Click the Java tab with the Tomcat7 properties.
• Compare the Java Virtual Machine path (which references the version) to the output of the command prompt result:

What does error 500 indicate?

The HyperText Transfer Protocol (HTTP) 500 Internal Server Error server error response code indicates that the server encountered an unexpected condition that prevented it from fulfilling the request.26-Nov-2022

How do I fix error 500 in Java?

Reinstall Java on the System If the Java’s installation on your system itself is corrupt, then that can also be the cause of the issue as many of the Java libraries may not be available to the problematic game, application, or website. In this scenario, reinstalling Java on your system may clear the error 500.01-Apr-2022

Is error 500 my fault?

If you try to visit a website and see a “500 Internal Server Error” message, it means something has gone wrong with the website. This isn’t a problem with your browser, your computer, or your internet connection. It’s a problem with the site you’re trying to visit.26-Oct-2022

Why my Apache Tomcat is not working?

Locate the Apache Tomcat service, and then verify that Running is listed in the Status column. If it is not running, try to start the service manually by selecting it and clicking Start.10-Aug-2022

How do I run Tomcat on port 8080?

Answer

• Stop Apache Tomcat service.
• Go to your Apache Tomcat folder (for example C:\Program Files\Apache Software Foundation\Tomcat 7.0) and find file server.
• Modify the Connector port value from 8080″ to the one you want to assign to your web server.
• Save the file.
• Restart the Apache Tomcat service.

How do I allow Tomcat through firewall?

Navigate to C:\Program Files (x86)\ADInstruments\LabTutor Server\tomcat\bin and select tomcat6.exe (If 32-bit, navigate to C:\Program Files\ADInstruments\LabTutor Server\tomcat\bin) Click Open, Next and then Allow the connection. Click Next and select the checkboxes for Domain, Private and Public, then click Next.