java.lang.NoClassDefFoundError: org/apache/poi/ss/usermodel/RichTextString at org.primefaces.component.export.ExporterFactory.getExporterForType

问题

I used the same sample code Primefaces has in its web page:

<h:commandLink value="Excel">                     
  <p:dataExporter type="xls" target="dataTable" fileName="boo" pageOnly="true"/>  
</h:commandLink>

But does not work. In Internet Explorer browser gives the following message:

Details of the errors of the web page Message: Unexpected call to method or property access.

Nothing ever happens in Mozilla Firefox.

What might be happening?

回答1:

javax.servlet.ServletException: org/apache/poi/ss/usermodel/RichTextString

Look further down in the stacktrace. I bet that the root cause is either a NoClassDefFoundError or ClassNotFoundException? In that case, this just means that you forgot to install Apache POI.

Download this Apache POI zip file, extract it, put poi-3.8-20120326.jar in /WEB-INF/lib folder and rebuild/redeploy/restart the webapp.

回答2:

Try to to put this jar file.I show the link,because i solved this problem.

http://apache.mirrors.pair.com/poi/release/bin/poi-bin-3.9-20121203.zip

来源：https://stackoverflow.com/questions/13293433/java-lang-noclassdeffounderror-org-apache-poi-ss-usermodel-richtextstring-at-or