No runtime on my Worklight 6.2 Console - ibm-mobilefirst

Question

After deploying an war file in a Worklight 6.2 environment, the console doesn't show the associated runtime environment : No runtime can be found. It's a basic usage of Worklight 6.2, but I don't know how to fix it !
What I've done :
Installation of Worklight Entreprise 6.2 on WebSphere Liberty 8.5.5.2 + DB2 V10.5
customisation of the configuration-liberty-db2.xml with my settings
ant -f myxmlfile admdatabases
ant -f myxmlfile adminstall
ant -f myxmlfile databases
ant -f myxmlfile install
I have the worklight console in the path ~/worklightconsole but no runtime !
and in the liberty log :
[6/24/14 15:28:00:978 CEST] 00000021 com.worklight.common.util.jmx.LibertyRuntimeMBeanHandler I Bean '*' does not exist.
[6/24/14 15:28:00:979 CEST] 00000021 com.ibm.worklight.admin.services.RuntimeService I No mxbeans found
And here is an extract of my server.xml liberty file :
ant task for context root '/myapp'. -->
<!-- Declare the IBM Worklight project runtime application. -->
<application id="myapp" name="myapp" location="MyProject.war" context-root="/myapp" type="war">
<classloader delegation="parentLast">
<privateLibrary>
<fileset dir="${shared.resource.dir}/myapp/lib" includes="worklight-jee-library.jar"/>
</privateLibrary>
</classloader>
</application>
<!-- Declare the JNDI properties for the IBM Worklight project runtime. -->
<jndiEntry jndiName="myapp/publicWorkLightProtocol" value='"http"'/>
<jndiEntry jndiName="myapp/publicWorkLightPort" value='"9080"'/>
<!-- Declare the jar files for DB2 access through JDBC. -->
<library id="myapp/DB2Lib">
<fileset dir="${shared.resource.dir}/myapp/db2" includes="db2jcc4.jar,db2jcc_license_cu.jar"/>
</library>
<!-- Declare the IBM Worklight Server database. -->
<dataSource jndiName="myapp/jdbc/WorklightDS" transactional="false">
<jdbcDriver libraryRef="myapp/DB2Lib"/>
<properties.db2.jcc databaseName="WRKLGHT" serverName="localhost" portNumber="50001" user="db2inst1" password="db2inst1" currentSchema="WRKLGHT"/>
</dataSource>
<!-- Declare the IBM Worklight Server reports database. -->
<dataSource jndiName="myapp/jdbc/WorklightReportsDS" transactional="false">
<jdbcDriver libraryRef="myapp/DB2Lib"/>
<properties.db2.jcc databaseName="WRKLGHT" serverName="localhost" portNumber="50001" user="db2inst1" password="db2inst1" currentSchema="WLREPORT"/>
</dataSource>
<!-- End of configuration added by IBM Worklight <configureApplicationServer> ant task for context root '/myapp'. -->

Answer 1

There is a defect in the Liberty 8.5.5.2 classloader that can affect Worklight (not only the 6.2 version but all versions) and even existing non Worklight applications that define classloading policy rule in the server.xml file.
The workaround is to delete the content of the Liberty server workarea directory and start the server with the --clean option (each time you restart also).