Cannot open the admin-console web application on JBoss EAP 5

Issue

• Cannot open the admin-console web application with the following error:

  javax.servlet.ServletException: Error reading 'currentPath' on type org.jboss.on.embedded.ui.NavigationAction_$$_javassist_8  
      at javax.faces.webapp.FacesServlet.service(FacesServlet.java:277)  
      at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)  
      at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)  
      at org.jboss.seam.servlet.SeamFilter$FilterChainImpl.doFilter(SeamFilter.java:83)  
      ...  
  Caused by:javax.el.ELException: Error reading 'currentPath' on type org.jboss.on.embedded.ui.NavigationAction_$$_javassist_8  
      at javax.el.BeanELResolver.getValue(BeanELResolver.java:66)  
      at javax.el.CompositeELResolver.getValue(CompositeELResolver.java:54)  
      at com.sun.faces.el.FacesCompositeELResolver.getValue(FacesCompositeELResolver.java:72)  
      at org.jboss.el.parser.AstPropertySuffix.getValue(AstPropertySuffix.java:53)  
      at org.jboss.el.parser.AstValue.getValue(AstValue.java:67)  
      at org.jboss.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:186)  
      at org.jboss.seam.core.Expressions$1.getValue(Expressions.java:112)  
      ...  
  Caused by:java.lang.IllegalArgumentException: ResourceTreeNode requires a Resource - null was passed into the constructor.  
      at org.jboss.on.embedded.ui.nav.ResourceTreeNode.<init>(ResourceTreeNode.java:47)  
      at org.jboss.on.embedded.ui.nav.PlatformResourceTreeNode.<init>(PlatformResourceTreeNode.java:38)  
      at org.jboss.on.embedded.ui.NavigationContent.createJONTreeNode(NavigationContent.java:64)  
      at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)  
      at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)  
      at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)  
      at java.lang.reflect.Method.invoke(Method.java:597)  
      ...
  

• Resource is null because no platform plugin could be loaded:

  ERROR [org.rhq.core.pc.inventory.InventoryManager] (http-nydetemdr10d%2F191.9.1.202-8080-1) Error in platform discovery  
      org.rhq.core.clientapi.agent.PluginContainerException: Could not find plugin class [org.rhq.plugins.platform.LinuxPlatformDiscoveryComponent] from classloader [PluginClassLoader@8a3bf2[parent=org.rhq.core.pc.plugin.RootPluginClassLoader@165c590,embedded-dir=[<>],urls=[jndi:/localhost/admin-console/plugins/rhq-platform-plugin-1.3.0.EmbJopr.1.3.0-4.jar]]]  
      at org.rhq.core.pc.plugin.PluginComponentFactory.instantiateClass(PluginComponentFactory.java:240)  
      at org.rhq.core.pc.plugin.PluginComponentFactory.getDiscoveryComponent(PluginComponentFactory.java:110)  
      at org.rhq.core.pc.inventory.InventoryManager.discoverPlatform(InventoryManager.java:1538)  
      at org.rhq.core.pc.inventory.InventoryManager.executePlatformScan(InventoryManager.java:375)  
      at org.rhq.core.pc.inventory.InventoryManager.initialize(InventoryManager.java:209)  
      at org.rhq.core.pc.PluginContainer.startContainerService(PluginContainer.java:359)  
      ....  
  Caused by: java.lang.ClassNotFoundException: org.rhq.plugins.platform.LinuxPlatformDiscoveryComponent  
      at java.net.URLClassLoader$1.run(URLClassLoader.java:200)  
      at java.security.AccessController.doPrivileged(Native Method)  
      at java.net.URLClassLoader.findClass(URLClassLoader.java:188)  
      at java.lang.ClassLoader.loadClass(ClassLoader.java:307)  
      at org.rhq.core.pc.plugin.PluginClassLoader.loadClass(PluginClassLoader.java:63)  
      at java.lang.ClassLoader.loadClass(ClassLoader.java:252)  
      at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)  
      at java.lang.Class.forName0(Native Method)  
      at java.lang.Class.forName(Class.java:247)  
      at org.rhq.core.pc.plugin.PluginComponentFactory.instantiateClass(PluginComponentFactory.java:228)  
      ... 97 more