2608940 - Enterprise Manager <host>:<port:> is offline in Basic Configuration - Error 404

The Enterprise Manager is reported as offline in the configuration due to a 404 error, and the solution described in KBA 2352112 is already applied:

In the Solution Manager defaultTrace, you see the following errors:

...and in the IntroscopeEnterpriseManager.log, the following error is raised:

Caused by: java.lang.UnsupportedClassVersionError: com/sap/introscope/SapQueryContextPath has been compiled by a more recent version of the Java Runtime (class file version 51.0), this version of the Java Runtime only recognizes class file versions up to 50.0
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClassCond(ClassLoader.java:739)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:720)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java:165)
    at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClass(ClasspathManager.java:554)
    at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findClassImpl(ClasspathManager.java:524)
    at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClassImpl(ClasspathManager.java:455)
    ...

• SAP Solution Manager 7.2

• Introscope Enterprise Manager 10.1 and 10.5

   
Severity: Error
Location: com.sap.smd.introscope.em.rest.EmRestGateway.test
Text: Error accessing to Enterprise Manager: <host>@6001
[EXCEPTION]
com.sap.smd.introscope.em.IntroscopeException: http status code 404
at com.sap.smd.introscope.em.rest.IntroscopeHttpConnection.executeQuery(IntroscopeHttpConnection.java:153)
at com.sap.smd.introscope.em.PooledConnection.executeQuery(PooledConnection.java:26)
at com.sap.smd.introscope.em.rest.EmRestGateway.performStatusQuery(EmRestGateway.java:80)
at com.sap.smd.introscope.em.rest.EmRestGateway.test(EmRestGateway.java:45)
at com.sap.sup.admin.wily.jdbc.EMInfo.test(EMInfo.java:398)
at com.sap.sup.admin.setup.methods.GetEMDescriptionWSMethod.getEMStatus(GetEMDescriptionWSMethod.java:240)
at com.sap.sup.admin.setup.methods.GetEMDescriptionWSMethod.calculateStatusForEMID(GetEMDescriptionWSMethod.java:176)
at com.sap.sup.admin.setup.util.EMStatusCacheRunner.run(EMStatusCacheRunner.java:116)
at com.sap.smd.server.exec.TaskRunner.run(TaskRunner.java:47)
at com.sap.smd.server.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java:785)
at java.lang.Thread.run(Thread.java:763)
Location: com.sap.sup.admin.wily.jdbc.EMOverview.getQueryEMgrs(false,false)
Text: All configured Enterprise Managers are offline - check configuration.


, KBA , SV-SMG-DIA-WLY-EMS , Enterprise Manager Setup , Problem