Warning message "Failed to apply SNI to SSLSocket" in RH-SSO

Issue

• The following exception is always reported in the RH-SSO adapter log:

  WARNING [org.keycloak.adapters.SniSSLSocketFactory] (http-0.0.0.0:8082-1) Failed to apply SNI to SSLSocket: java.security.PrivilegedActionException: java.lang.NoSuchMethodException: com.ibm.jsse2.au.setHost(java.lang.String)
      at java.security.AccessController.doPrivileged(AccessController.java:698) [vm.jar:1.8.0]
      at org.keycloak.adapters.SniSSLSocketFactory.applySNI(SniSSLSocketFactory.java:120) [keycloak-adapter-core-3.4.3.Final-redhat-2.jar:3.4.3.Final-redhat-2]
      at org.keycloak.adapters.SniSSLSocketFactory.connectSocket(SniSSLSocketFactory.java:109) [keycloak-adapter-core-3.4.3.Final-redhat-2.jar:3.4.3.Final-redhat-2]
      at org.apache.http.conn.ssl.SSLSocketFactory.connectSocket(SSLSocketFactory.java:403)
      at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:177)
      at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:144)
      at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:131)
      at org.apache.http.impl.client.DefaultRequestDirector.tryConnect(DefaultRequestDirector.java:611)
      at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:446)
      at org.apache.http.impl.client.AbstractHttpClient.doExecute(AbstractHttpClient.java:863)
      at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:82)
      at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:106)
      at org.apache.http.impl.client.CloseableHttpClient.execute(CloseableHttpClient.java:57)
      at org.keycloak.adapters.ServerRequest.invokeAccessCodeToToken(ServerRequest.java:111) [keycloak-adapter-core-3.4.3.Final-redhat-2.jar:3.4.3.Final-redhat-2]
      at org.keycloak.adapters.OAuthRequestAuthenticator.resolveCode(OAuthRequestAuthenticator.java:336) [keycloak-adapter-core-3.4.3.Final-redhat-2.jar:3.4.3.Final-redhat-2]
      ...