Develop Reference

How can I solve java.lang.Class.forName(Unknown Source) error?

I am trying to make a project on Servlets using JDBC. But there are some persistent errors in the error log like java.lang.Class.forName(Unknown Source), java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source), java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source), java.lang.Thread.run(Unknown Source) etc. How can I solve such errors from happening?
I am using Apache Tomcat v7.0, mySQL Community Server v5.7 and Eclipse IDE.
This my error log:
java.lang.ClassNotFoundException: com.mysql.driver.JDBC
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1892)
at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1735)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Unknown Source)
at Register.register(Register.java:10)
at RegisterServlet.doPost(RegisterServlet.java:34)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:506)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:962)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:452)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1087)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
This is the JDBC file code(Register.java):
import java.sql.*;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class Register {
public static final Pattern VALID_EMAIL_ADDRESS_REGEX = Pattern.compile("^[A-Z0-9._%+-]+#[A-Z0-9.-]+\\.[A-Z]{2,6}$", Pattern.CASE_INSENSITIVE);
public static final Pattern VALID_PHONE_NUMBER_REGEX = Pattern.compile("[7-9][0-9]\\d{9}"); // ,Pattern.CASE_INSENSITIVE);
public static int register(String name,String user,String pass,String cpass,String email, String phone,String city,String state) throws ClassNotFoundException{
int status=0;
try{
Class.forName("com.mysql.driver.JDBC");
Connection con=DriverManager.getConnection("jdbc:sqlite:localhost:8080/Diary.db");
System.out.println("Database connected successfully!!");
PreparedStatement ps=con.prepareStatement("INSERT INTO Trial(name, user, pass, email, phone, city, state, authorized) values(?,?,?,?,?,?,?,?)");
if(pass!=null && cpass!=null && phone!=null && name!=null && user!=null && city!=null && state!=null){
Matcher matcher1 = VALID_EMAIL_ADDRESS_REGEX .matcher(email);
Matcher matcher2 = VALID_PHONE_NUMBER_REGEX .matcher(phone);
if((pass==cpass) && (matcher1.find()) && (matcher2.find())){
ps.setString(1,name);
ps.setString(2,user);
ps.setString(3,pass);
ps.setString(4,email);
ps.setString(5,phone);
ps.setString(6,city);
ps.setString(7,state);
ps.setString(8,"yes");
status=ps.executeUpdate();
}
else{
status = 0;
}
}
}catch(SQLException e){e.getMessage();}
return status;
}
}
This is my servlet (RegisterSevlet.java):
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
#WebServlet("/RegisterServlet")
public class RegisterServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest req, HttpServletResponse res)
throws ServletException, IOException {
int status;
res.setContentType("text/html");
PrintWriter out=res.getWriter();
String name=req.getParameter("name");
String user=req.getParameter("user");
String pass=req.getParameter("pass");
String cpass=req.getParameter("cpass");
String email=req.getParameter("email");
String phone=req.getParameter("phone");
String city=req.getParameter("city");
String state=req.getParameter("state");
try {
status = Register.register(name, user, pass, cpass, email, phone, city, state);
if(status > 0){
out.print("<p>You are successfully registered!</p>");
req.getRequestDispatcher("login.html").include(req, res);
}
else if(status == 0){
out.println("<p>Enter the information correctly!</p>");
res.sendRedirect("register.html");
}
req.getRequestDispatcher("#").include(req, res);
out.close();
} catch (ClassNotFoundException e) {
e.printStackTrace();
}
}
}

`Class.forName()`
throws ClassNotFoundException
You need to include multicatch statement for that (same catch for SQLException and ClassNotFoundException)
You can modify your catch statement to this:
catch (ClassNotFoundException | SQLException e)
{
e.printStackTrace();
}
Try this. You can use a multicatch statement wherever you need to catch multiple exceptions.

This exception is thrown whenever a class existed at compile time but not at run time.
Please check that at runtime ur classpath is correct and you are pointing to the library in question (in ur case the mysql connector jar).

Hibernate session is null when executing SQL query

When executing a SQL native query with SQLQuery q = session.createSQLQuery(query).addEntity("edu", StudentEduPojo.class); JVM throws a null pointer exception.
DBConnectionDao.class
package com.ms.avalon.master.dao.rdbms;
import javax.sql.DataSource;
import org.apache.commons.dbcp.BasicDataSource;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.jdbc.core.namedparam.NamedParameterJdbcTemplate;
import org.springframework.orm.hibernate3.HibernateTemplate;
import org.springframework.stereotype.Repository;
#Repository
public class DBConnectionDao {
protected Session session;
protected DataSource dataSource;
protected SessionFactory sessionFactory;
protected HibernateTemplate hibernateTemplate=null;
protected NamedParameterJdbcTemplate namedJdbcTemplate=null;
#Autowired
public void setDataSource(DataSource dataSource) {
this.dataSource = dataSource;
namedJdbcTemplate=new NamedParameterJdbcTemplate(dataSource);
}
#Autowired
public void setSessionFactory(SessionFactory sessionFactory) {
System.out.println("session created");
this.sessionFactory = sessionFactory;
session = sessionFactory.getCurrentSession();
hibernateTemplate=new HibernateTemplate(sessionFactory);
}
}
PlacementDaoRdbms.class
package com.ms.avalon.master.dao.rdbms;
import java.util.ArrayList;
import java.util.List;
import org.hibernate.SQLQuery;
import org.hibernate.criterion.DetachedCriteria;
import com.ms.avalon.master.beans.PlacementCaseBean;
import com.ms.avalon.master.dao.PlacementDao;
import com.ms.avalon.master.formbeans.PlacementFormBean;
import com.ms.avalon.master.pojos.studentpojos.StudentEduPojo;
import com.ms.avalon.master.pojos.studentpojos.StudentTestPojo;
public class PlacementDaoRdbms extends DBConnectionDao implements PlacementDao {
#Override
public List<StudentEduPojo> searchWithCases(PlacementCaseBean caseBean, PlacementFormBean placementBean) {
String query = "Some complicated SQL query";
SQLQuery q = session.createSQLQuery(query)
.addEntity("edu", StudentEduPojo.class);
List<StudentEduPojo> list = q.list();
return list;
}
}
When using the function createSqlQuery on session in PlacementDaoRdbms, I get a NPE.
Following is the stack trace:
May 11, 2016 8:52:17 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [dispatcher] in context with path [/Avalon-1.0] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
java.lang.NullPointerException
at com.ms.avalon.master.dao.rdbms.PlacementDaoRdbms.searchWithCases(PlacementDaoRdbms.java:108)
at com.ms.avalon.master.business.TalentCaseHandler.searchForCases(TalentCaseHandler.java:61)
at com.ms.avalon.master.service.impl.PlacementServiceImpl.searchForTalent(PlacementServiceImpl.java:26)
at com.ms.avalon.master.controllers.PlacementController.searchForTalent(PlacementController.java:29)
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 org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:176)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:427)
at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:415)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:788)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:717)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:644)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:560)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:646)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at com.opensymphony.module.sitemesh.filter.PageFilter.parsePage(PageFilter.java:119)
at com.opensymphony.module.sitemesh.filter.PageFilter.doFilter(PageFilter.java:55)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:504)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:421)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1074)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:611)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
Also, is this the correct way to use session from the parent class?
Thanks for the help :)

The method searchWithCases in PlacementDaoRdbms was being called from another class (let's call that A). I was creating A's object using new keyword, which was causing DI and #Autowired to not work. I know I should have posted the full code but still, thanks for the help and advice. Let me know if you've got a similar problem :)

java.sql.SQLSyntaxErrorException: at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:450) at oracle.jdbc.dr

I have just start learning the jdbc with servlet and I have a table in oracle database that contain the result of students. I want to fetch the detail while searching through the roll no. my code is here
index.html
<form action="ResultServlet">
Enter your Rollno:<input type="text" name="roll" /><br /> <input
type="submit" value="search" />
</form>
ResultServlet.java
package atulrai;
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class ResultServlet
*/
#WebServlet("/ResultServlet")
public class ResultServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
/**
* #see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse
* response)
*/
protected void doGet(HttpServletRequest request,
HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String rollno = request.getParameter("roll");
int roll = Integer.valueOf(rollno);
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection con = DriverManager.getConnection(
"jdbc:oracle:thin:#localhost:1521:oracle12c", "AtulRai",
"atulrai");
PreparedStatement ps = con
.prepareStatement("select * from result where rollno=?");
ps.setInt(1, roll);
out.print("<table width=50% border=1>");
out.print("<caption>Result:</caption>");
ResultSet rs = ps.executeQuery();
/* Printing column names */
ResultSetMetaData rsmd = rs.getMetaData();
int total = rsmd.getColumnCount();
out.print("<tr>");
for (int i = 1; i <= total; i++) {
out.print("<th>" + rsmd.getColumnName(i) + "</th>");
}
out.print("</tr>");
/* Printing result */
while (rs.next()) {
out.print("<tr><td>" + rs.getInt(1) + "</td><td>"
+ rs.getString(2) + "</td><td>" + rs.getString(3)
+ "</td><td>" + rs.getString(4) + "</td></tr>");
}
out.print("</table>");
} catch (Exception e2) {
e2.printStackTrace();
}
finally {
out.close();
}
}
}
when I have entered the roll no in html form it throw some exception which is not understandable for me. Any help please
error here
java.sql.SQLSyntaxErrorException: ORA-00942: table or view does not exist
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:450)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:399)
at oracle.jdbc.driver.T4C8Oall.processError(T4C8Oall.java:1059)
at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:522)
at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:257)
at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:587)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:225)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:53)
at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:774)
at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:925)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1111)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:4798)
at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:4845)
at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeQuery(OraclePreparedStatementWrapper.java:1501)
at atulrai.ResultServlet.doGet(ResultServlet.java:51)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:624)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)

From the image you shared, it seems that the table was created with double quotes ("), making the name case sensitive. If this is the case, you should refer to it in that way in the select statement too:
PreparedStatement ps =
con.prepareStatement("select * from \"result\" where rollno=?");

Getting "Error loading object from InputStream" exception during call JasperRunManager.runReportToPdfStream

I'm trying to generate pdf via button but my problem is this method
JasperRunManager.runReportToPdfStream(reportStream,servletOutputStream, new HashMap<Object, Object>(), resultSetDataSource);
it is not supporting Hashmap it gives following error
The method runReportToPdfStream(InputStream, OutputStream, Map<String,Object>, Connection) in the type JasperRunManager is
not applicable for the arguments (InputStream, ServletOutputStream, HashMap<Object,Object>, JRResultSetDataSource)
it Supports String parameter like Hashmap<String,Object> while generating pdf it gives following error
net.sf.jasperreports.engine.JRException: Error loading object from InputStream
at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:219)
at net.sf.jasperreports.engine.JasperFillManager.fill(JasperFillManager.java:632)
at net.sf.jasperreports.engine.JasperRunManager.runToPdfStream(JasperRunManager.java:428)
at net.sf.jasperreports.engine.JasperRunManager.runReportToPdfStream(JasperRunManager.java:849)
at com.p41.jasper.Jasper.doPost(Jasper.java:103)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:647)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:487)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:412)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:339)
at com.sun.faces.context.ExternalContextImpl.dispatch(ExternalContextImpl.java:546)
at com.sun.faces.application.view.JspViewHandlingStrategy.executePageToBuildView(JspViewHandlingStrategy.java:364)
at com.sun.faces.application.view.JspViewHandlingStrategy.buildView(JspViewHandlingStrategy.java:154)
at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:100)
at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
at javax.faces.webapp.FacesServlet.service(FacesServlet.java:410)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at com.p41.setting.FacesFilter.doFilter(FacesFilter.java:153)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:99)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:936)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1004)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:589)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.io.StreamCorruptedException: invalid stream header: 3C3F786D
at java.io.ObjectInputStream.readStreamHeader(Unknown Source)
at java.io.ObjectInputStream.<init>(Unknown Source)
at net.sf.jasperreports.engine.util.ContextClassLoaderObjectInputStream.<init>(ContextClassLoaderObjectInputStream.java:53)
at net.sf.jasperreports.engine.util.JRLoader.loadObject(JRLoader.java:214)
Servlet
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.Statement;
import java.util.HashMap;
import java.util.HashSet;
import javax.servlet.ServletException;
import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import net.sf.jasperreports.engine.JRResultSetDataSource;
import net.sf.jasperreports.engine.JasperRunManager;
public class Jasper extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
Connection connection;
Statement statement;
ResultSet resultSet;
response.setContentType("text/html");
String si = request.getParameter("input");
ServletOutputStream servletOutputStream = response.getOutputStream();
byte[] bytes = null;
InputStream reportStream = getServletConfig().getServletContext().getResourceAsStream("WEB-INF/HR/Jasp.jasper");
System.out.println("Print" + si);
try {
System.out.println("Second print" + si);
String query = "SELECT Where Empno = '" + si + "' ";
Class.forName("com.mysql.jdbc.Driver");
connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/schemedb?user=root&password=root");
statement = connection.createStatement();
resultSet = statement.executeQuery(query);
JRResultSetDataSource resultSetDataSource = new JRResultSetDataSource(resultSet);
response.setContentType("application/pdf");
servletOutputStream.flush();
servletOutputStream.close();
System.out.println("print" + reportStream);
System.out.println("print" + servletOutputStream);
System.out.println("print" + resultSetDataSource);
JasperRunManager.runReportToPdfStream(reportStream, servletOutputStream, new HashMap<Object, Object>(), resultSetDataSource);
resultSet.close();
statement.close();
connection.close();
response.setContentType("application/pdf");
servletOutputStream.flush();
servletOutputStream.close();
} catch (Exception e) {
StringWriter stringWriter = new StringWriter();
PrintWriter printWriter = new PrintWriter(stringWriter);
e.printStackTrace(printWriter);
response.setContentType("text/plain");
response.getOutputStream().print(stringWriter.toString());
}
}
}

Solution is I Removed Run Report pdf stream and used method as exportReport to pdf Stream
JasperRunManager.runReportToPdfStream(reportStream,servletOutputStream, new HashMap<Object, Object>(), resultSetDataSource);
Coding:-
InputStream reportStream = getServletConfig().getServletContext().getResourceAsStream("WEB-INF/HR/Jasp.jrxml");
ByteArrayOutputStream baos =new ByteArrayOutputStream();
response.setContentType("application/pdf");
JasperDesign design = JRXmlLoader.load(reportStream);
JasperReport report = JasperCompileManager.compileReport(design);
JRResultSetDataSource jasperReports = new JRResultSetDataSource(rs);
JasperPrint print = JasperFillManager.fillReport(report, new HashMap(), jasperReports);
net.sf.jasperreports.engine.JasperExportManager.exportReportToPdfStream(print,baos);
response.setContentLength(baos.size());
ServletOutputStream out1 = response.getOutputStream();
baos.writeTo(out1);
out1.flush();
rs.close();
st.close();
conn.close();

com.google.common.cache.Cache class not found error

I am using Guava 14.0 jar and following is my code
package org.user.module.test;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.concurrent.TimeUnit;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.Cache;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
/**
* Servlet implementation class test
*/
#WebServlet("/test")
public class test extends HttpServlet {
private static final long serialVersionUID = 1L;
Cache<String, Integer> map;
public test() {
super();
// TODO Auto-generated constructor stub
}
public void init() throws ServletException
{
map=CacheBuilder.newBuilder().
maximumSize(100).
expireAfterAccess(10, TimeUnit.MINUTES).
build();
}
/**
* #see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
PrintWriter out=response.getWriter();
String p=request.getParameter("v");
Integer a=map.getIfPresent(p);
if(a==null){
map.put(p, 1);
out.println("Putting The Integer:"+a);
}
else{
map.put(p,a++);
out.println("A is already present and the value is:"+a);
}
}
/**
* #see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
doGet(request,response);
}
}
Error:
SEVERE: Allocate exception for servlet org.user.module.test.test
java.lang.ClassNotFoundException: com.google.common.cache.Cache at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1701)
at
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1546)
at java.lang.Class.getDeclaredFields0(Native Method) at
java.lang.Class.privateGetDeclaredFields(Class.java:2317) at
java.lang.Class.getDeclaredFields(Class.java:1762) at
org.apache.catalina.core.DefaultInstanceManager.populateAnnotationsCache(DefaultInstanceManager.java:276)
at
org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:143)
at
org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:125)
at
org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1136)
at
org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:857)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:135)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:169)
at
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)
at
org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)
at
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:987)
at
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:579)
at
org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:307)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:722)
downloaded jar from here Downlaod Link
Link to my project folder(Project name:test2) LINK

Obvious answer is that;
The Google guava jar is not found from the classpath dictated by the application server. The jar should be present in either WEB-INF/classes or WEB-INF/lib. Apache Tomcat also loads common classes from $CATALINA_HOME/lib folder.