Modified the example slightly in order to work correctly and look better.

Kieker.WebGUI/bin/data/Bookstore-Example/Bookstore-Example.kax

 <?xml version="1.0" encoding="UTF-8"?>
 <Project xmi:version="2.0" xmlns:xmi="http://www.omg.org/XMI" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="platform:/resource/Kieker/model/AnalysisMetaModel.ecore">
   <plugins xsi:type="Reader" name="FSReader" classname="kieker.analysis.plugin.reader.filesystem.FSReader">
-    <properties name="inputDirs" value="testdata" description="The name of the input dirs used to read data (multiple dirs are separated by |)."/>
-    <properties name="ignoreUnknownRecordTypes" value="false" description="Ignore unknown records? Aborts if encountered and value is false."/>
-    <outputPorts name="monitoringRecords" subscribers="//@plugins.1/@inputPorts.0 //@plugins.5/@inputPorts.0"/>
+    <properties name="inputDirs" value="data/Bookstore-Example/testdata"/>
+    <properties name="ignoreUnknownRecordTypes" value="false"/>
+    <outputPorts name="monitoringRecords" subscribers="//@plugins.5/@inputPorts.0"/>
   </plugins>
   <plugins xsi:type="Filter" name="MyResponseTimeFilter" classname="kieker.examples.userguide.ch3and4bookstore.MyResponseTimeFilter">
-    <properties name="thresholdNanos" value="1900000" description=""/>
-    <outputPorts name="validResponseTimes" subscribers="//@plugins.4/@inputPorts.0 //@plugins.6/@inputPorts.0"/>
-    <outputPorts name="invalidResponseTimes" subscribers="//@plugins.2/@inputPorts.0 //@plugins.3/@inputPorts.0"/>
+    <properties name="thresholdNanos" value="1900000"/>
+    <outputPorts name="validResponseTimes" subscribers="//@plugins.4/@inputPorts.0"/>
+    <outputPorts name="invalidResponseTimes" subscribers="//@plugins.3/@inputPorts.0"/>
     <inputPorts name="newResponseTime"/>
   </plugins>
   <plugins xsi:type="Filter" name="Invalid Printer" classname="kieker.examples.userguide.ch3and4bookstore.MyResponseTimeOutputPrinter">
-    <properties name="validOutput" value="false" description=""/>
+    <properties name="validOutput" value="false"/>
     <inputPorts name="newEvent"/>
   </plugins>
   <plugins xsi:type="Filter" name="Invalid Counter" classname="kieker.analysis.plugin.filter.forward.CountingFilter">
-    <outputPorts name="relayedEvents"/>
+    <outputPorts name="relayedEvents" subscribers="//@plugins.2/@inputPorts.0"/>
     <outputPorts name="currentEventCount"/>
     <displays name="Counter Display"/>
     <inputPorts name="inputEvents"/>
   </plugins>
   <plugins xsi:type="Filter" name="Valid Counter" classname="kieker.analysis.plugin.filter.forward.CountingFilter">
-    <outputPorts name="relayedEvents"/>
+    <outputPorts name="relayedEvents" subscribers="//@plugins.6/@inputPorts.0"/>
     <outputPorts name="currentEventCount"/>
     <displays name="Counter Display"/>
     <inputPorts name="inputEvents"/>
   </plugins>
   <plugins xsi:type="Filter" name="Global Counter" classname="kieker.analysis.plugin.filter.forward.CountingFilter">
-    <outputPorts name="relayedEvents"/>
+    <outputPorts name="relayedEvents" subscribers="//@plugins.1/@inputPorts.0"/>
     <outputPorts name="currentEventCount"/>
     <displays name="Counter Display"/>
     <inputPorts name="inputEvents"/>
   </plugins>
   <plugins xsi:type="Filter" name="Valid Printer" classname="kieker.examples.userguide.ch3and4bookstore.MyResponseTimeOutputPrinter">
-    <properties name="validOutput" value="true" description=""/>
+    <properties name="validOutput" value="true"/>
     <inputPorts name="newEvent"/>
   </plugins>
   <dependencies filePath="BookstoreApplication.jar"/>