Examples of such issue:
javax.servlet.ServletException:
com.caucho.jsp.JspParseException: _jsp/_logon__jsp.java:10: cannot
access org.agnitas.beans.EmmLayout
bad class file:
/home/mvohra/openemm/webapps/core/WEB-INF/classes/org/agnitas/beans/EmmLayout.class
class
file has wrong version 50.0, should be 49.0
Please remove or make sure it appears in the correct subdirectory of the
classpath.
import org.agnitas.beans.EmmLayout;
^
1 error
This normally happens due to mismatch between your Runtime Java version and a certain library that was probably compiled with an older version of java.