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Jasper Reports and the Lib Folder of a Web Project

 
Michele Smith
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Hello: I inherited a web application and am trying to build it. I recently installed JasperSoft Studio 5.5.0 final on my developer machine. I also have Eclipse Juno on my developer machine. I was advised by the previous developer to put some of his Jasper .jar files into my web app's lib folder. I did do this and now the localhost will not run, it is generating this error:

org.apache.jasper.JasperException: java.lang.NullPointerException
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:502)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:430)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:313)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:260)
javax.servlet.http.HttpServlet.service(HttpServlet.java:723)

I went out to the lib folder and saw these files:

jasperreports-5.1.2
jasperreports-applet-5.1.2
jasperreports-expressions-1.0.0
jasperreports-exprfunction-1.0.0
jasperreports-fonts-5.1.2
jasperreports-javaflow-5.1.2

The version on them would appear incorrect given my version of 5.5. I am new to Jasper Reports. I suppose I could google on the .jar files and get the ones that belong to the 5.5.0 final and put them into the directory to see if Apache Tomcat 6.0.39 likes that better. And then start the server. If it doesn't like them, I guess I could remove them and continue, but I would prefer to have the Jasper Reports up and running.

My second question about the Jasper Reports is how do you tell the IDE where the Reports are located?

Thanks,
Michele
 
Rob Spoor
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Although I would definitely match the Jasper versions, I don't think the NullPointerException is related to the version of Jasper Reports. Althought the stack trace mentions Jasper, that's the Tomcat JSP implementation. You have a NullPointerException occurring in your JSP, you just need to figure out where.
 
Bear Bibeault
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Yes, to emphasize, org.apache.jasper, is the Tomcat JSP engine, it is not part of Jasper Reports. Just an unfortunate naming collision.
 
It is sorta covered in the JavaRanch Style Guide.
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