Javax.servlet.jsp.JspTagException: IterationTag exception when performance test

Question

          hi all:
          i am working with weblogic510 , service pack10. i deploy my
          application as war file and all seems ok but in my performance
          test , there's error as following:
          26 20:30:34 GMT+08:00 2001:<E> <WebAppServletContext-AGENT> Root cause of ServletException
          javax.servlet.jsp.JspTagException: IterationTag: ???????
          at java.lang.Throwable.fillInStackTrace(Native Method)
          at java.lang.Throwable.fillInStackTrace(Compiled Code)
          at java.lang.Throwable.<init>(Compiled Code)
          at java.lang.Exception.<init>(Compiled Code)
          at javax.servlet.jsp.JspException.<init>(Compiled Code)
          at javax.servlet.jsp.JspTagException.<init>(Compiled Code)
          at com.cnc.model.account.tag.IterationTag.doAfterBody(Compiled Code)
          at jsp_servlet._client.__agentListSearch._jspService(Compiled Code)
          at weblogic.servlet.jsp.JspBase.service(Compiled Code)
          at weblogic.servlet.internal.ServletStubImpl.invokeServlet(Compiled Code)
          at weblogic.servlet.internal.ServletContextImpl.invokeServlet(Compiled
          Code)
          at weblogic.servlet.internal.ServletContextImpl.invokeServlet(Compiled
          Code)
          at weblogic.servlet.internal.ServletContextManager.invokeServlet(Compiled
          Code)
          at weblogic.socket.MuxableSocketHTTP.invokeServlet(Compiled Code)
          at weblogic.socket.MuxableSocketHTTP.execute(Compiled Code)
          at weblogic.kernel.ExecuteThread.run(Compiled Code)
          when i test with several current users , it's ok . but when i
          increase users to forty or fifty, the above exception occurs ,
          so some of the users fails , but others can go on successfully.
          i am rather confused.
          any help is appreciated!
          thanks in advance
          daniel
          

Answer 1

so i have specified no_of_books somewhere instead of getNo_Of_Books();
the program the error points to is:
public class ShoppingCartItem
RetailPriceItem item;
BigDecimal no_of_books;
BigDecimal price;
public ShoppingCartItem()
public ShoppingCartItem(RetailPriceItem item, BigDecimal no_of_books, BigDecimal price)
this.item = item;
this.no_of_books = no_of_books;
this.price = price;
public void setItem(RetailPriceItem item)
this.item = item;
public void setNo_Of_Books(BigDecimal no_of_books)
this.no_of_books=no_of_books;
public void setPrice(BigDecimal price)
this.price=price;
public RetailPriceItem getItem()
return item;
public BigDecimal getNo_Of_Books()
return no_of_books;
public BigDecimal getPrice()
return price;
}