Unified Reporter shows HTTP 500 error

Issue/Introduction:

The HTTP 500 error appears as follows:

HTTP 500 - Internal server error occurred. Please contact your system administrator.

org.apache.jasper.JasperException: An exception occurred processing JSP page /WEB-INF/jsp/modules/system/errorPage.jsp at line 84

81: } %>
82:
83: <div id="stepDisplay">
84: <c:if test="${not empty flowExecutionKey}">
85: <input type="hidden" name="_flowExecutionKey" value="${flowExecutionKey}"/>
86: </c:if>
87: <c:if test="${not empty param.parentFlow}">

In the jasperserver log (located on the UMP server at \Nimsoft\probes\service\wasp\webapps\jasperserver-pro\WEB-INF\logs\jasperserver-pro.log) you will also see the following exception:

Caused by: java.lang.ClassCastException: org.apache.jasper.el.ELContextImpl cannot be cast to org.apache.jasper.el.ELContextImpl
at org.apache.jasper.runtime.PageContextImpl.proprietaryEvaluate(PageContextImpl.java:941)
at org.apache.jsp.WEB_002dINF.jsp.modules.system.errorPage_jsp._jspx_meth_c_005fif_005f0(errorPage_jsp.java:1131)
at org.apache.jsp.WEB_002dINF.jsp.modules.system.errorPage_jsp._jspService(errorPage_jsp.java:281)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:432)

Cause:

This is caused by a conflicting .JAR file located in the wasp path which is related to the (now deprecated) webservices_soap package (SOAP API.)

Environment:

UIM 8.5x+

Resolution:

To resolve this problem and restore access to Unified Reporter, take the following steps:

1. deactivate the wasp probe
2. delete all the contents of the folder \Nimsoft\probes\service\wasp\work\
3. delete the file \wasp\webapps\webservices_soap.war if it exists
4. delete the folder \wasp\webapps\webservices_soap if it exists
5. edit the wasp.cfg and remove this whole section:

<webservices-soap>
reloadable = false
cross_context = true
<log>
<com.nimsoft.dao>
loglevel = 1
</com.nimsoft.dao>
<com.nimsoft.nms.services>
loglevel = 1
</com.nimsoft.nms.services>
<com.nimsoft.nms.servlet>
loglevel = 3
</com.nimsoft.nms.servlet>
</log>
load_on_startup = false
unpack_war = false
doc_base = webservices_soap
path = /ws
</webservices-soap>

6. Activate wasp.

Note: this will de-install the SOAP API.? However, the SOAP API is no longer maintained or supported - users should move to the REST API instead.