java.lang.ClassNotFoundException: org.apache.commons.fileupload.FileUploadExcept

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Why is NoClassDefFoundError being thrown?

    There are two common causes for this error.

    Firstly, it might simply mean that you do not have the Commons IO jar in your classpath. FileUpload depends on IO (see dependencies) - you can tell if this is the case if the missing class is within the org.apache.commons.io package.

    Secondly this happens when attempting to rely on a shared copy of the Commons FileUpload jar file provided by your web container. The solution is to include the FileUpload jar file as part of your own web application, instead of relying on the container. The same may hold for FileUpload's IO dependency.