Question

I am using apache poi to open an existing excel file.

public static int generateReport(Calendar csdate,Calendar cedate) throws Exception
{
     FileInputStream fileIn =null;
     FileOutputStream fileOut = null;
     int sum=0;//For calculating the total number of tickets
    final Workbook wb;
    fileIn =new FileInputStream("d:\\excelfiles\\TicketsReport.xlsm");
    wb = org.apache.poi.ss.usermodel.WorkbookFactory.create(fileIn);<-- Exception
    final Sheet sheet = wb.getSheet("Report");
    //rest of stuff
}

I have a servlet which takes the dates from an html page and call generateReport(). The problem is this program was running previously with same tomcat 6 version and servlet2.4 version.In eclipse there is no compile time error at the WorkbookFactory.create() line. Here’s the stack trace.

java.lang.NoClassDefFoundError: org/apache/poi/ss/usermodel/WorkbookFactory
at ReportFromJira.generateReport(ReportFromJira.java:59)
at JiraReportServlet.doPost(JiraReportServlet.java:52)
at JiraReportServlet.doGet(JiraReportServlet.java:36)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Unknown Source)

When I manually explored the jar files I found out that.

poi-3.8-20120326.jar contains
org.apache.poi.ss.usermodel->Workbook.class file

and poi-ooxml-3.8-20120326.jar contains
org.apache.poi.ss.usermodel->WorkbookFactory.class file

I have both the jar files included in my class path.

any idea why the exception?

Answer 1

Just put one of the jars in the WEB-INF\lib of your WAR\EAR because that is where Tomcat Picks the jars from by default.

Just including in eclipse project is not enough when tomcat is not being run though eclipse configuration.