org.kie.server.controller.client.exception.KieServerControllerHTTPClientException: Unexpected HTTP response code when requesting URI 'http://localhost:8080/standalone-controller/rest/controller/management/servers/KieServerBaseIntegrationTest@2018-05-137-223020_486'! Response code: 500 Response message: Unknown error null
	at org.kie.server.controller.client.rest.RestKieServerControllerClient.createExceptionForUnexpectedResponseCode(RestKieServerControllerClient.java:322)
	at org.kie.server.controller.client.rest.RestKieServerControllerClient.makeGetRequestAndCreateCustomResponse(RestKieServerControllerClient.java:228)
	at org.kie.server.controller.client.rest.RestKieServerControllerClient.getServerTemplate(RestKieServerControllerClient.java:88)
	at org.kie.server.integrationtests.shared.KieServerSynchronization.lambda$waitForServerInstanceSynchronization$15(KieServerSynchronization.java:251)
	at org.kie.server.integrationtests.shared.KieServerSynchronization.waitForCondition(KieServerSynchronization.java:358)
	at org.kie.server.integrationtests.shared.KieServerSynchronization.waitForCondition(KieServerSynchronization.java:347)
	at org.kie.server.integrationtests.shared.KieServerSynchronization.waitForServerInstanceSynchronization(KieServerSynchronization.java:250)
	at org.kie.server.integrationtests.controller.WebSocketKieControllerStartupIntegrationTest.testContainerDisposedAfterStartup(WebSocketKieControllerStartupIntegrationTest.java:251)