Question

Within my Java Dynamic Web Project I’m importing another Java project using Build Path so I can query the classes and use Java reflections. When writing my class I initially tested it by running it as a Java application and it worked. However I am now using the same class as part of a dynamic web project it can’t seem to access the imported Java project. I have tried importing it into my project references in Eclipse and it still does not work and outputs the following error:

HTTP Status 500 - javax.servlet.ServletException: java.lang.NoClassDefFoundError: com/q1labs/qa/selenium/widgets/WidgetHandler

--------------------------------------------------------------------------------

type Exception report

message javax.servlet.ServletException: java.lang.NoClassDefFoundError: com/q1labs/qa/selenium/widgets/WidgetHandler

description The server encountered an internal error (javax.servlet.ServletException: java.lang.NoClassDefFoundError: com/q1labs/qa/selenium/widgets/WidgetHandler) that prevented it from fulfilling this request.

exception 

org.apache.jasper.JasperException: javax.servlet.ServletException: java.lang.NoClassDefFoundError: com/q1labs/qa/selenium/widgets/WidgetHandler
org.apache.jasper.servlet.JspServletWrapper.handleJspException(JspServletWrapper.java:549)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:455)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)


root cause 

javax.servlet.ServletException: java.lang.NoClassDefFoundError: com/q1labs/qa/selenium/widgets/WidgetHandler
org.apache.jasper.runtime.PageContextImpl.doHandlePageException(PageContextImpl.java:911)
org.apache.jasper.runtime.PageContextImpl.handlePageException(PageContextImpl.java:840)
org.apache.jsp.UpdatingDb_jsp._jspService(UpdatingDb_jsp.java:98)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)


root cause 

java.lang.NoClassDefFoundError: com/q1labs/qa/selenium/widgets/WidgetHandler
com.q1labs.qa.xmlgenerator.controller.updatedb.DbUpdateScript.updateObjectTypes(DbUpdateScript.java:40)
com.q1labs.qa.xmlgenerator.controller.updatedb.DbUpdateScript.updateDb(DbUpdateScript.java:31)
org.apache.jsp.UpdatingDb_jsp._jspService(UpdatingDb_jsp.java:88)
org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:390)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
javax.servlet.http.HttpServlet.service(HttpServlet.java:722)

Answer 1

Check your Project Properties > Deployment Assembly configuration. Go to Add and select Project > Next and select your project. Now this will only include the classes of your project. If your Java project includes external or other JAR references, you have to also include them manually on your new Web Project by copying them to your WEB-INF/lib or by adding them as External Jars. If you do the second one, don’t forget to mark them in the Order & Export tab.