When attempting to deploy a Java (WAR) app to Pivotal Cloud Foundry, the operation seems to be successful but the build fails with a 503 error when starting the application. I've managed to push the same application (the spring-music app that Pivotal use for their training) using the CLI without issue. Output is as follows:

Cloud Foundry Plugin:
Pushing spring-music app to https://api.run.pivotal.io
Creating new app.
Pushing app bits.
Starting application.
org.cloudfoundry.client.lib.org.springframework.web.client.HttpServerErrorException: 503 Service Unavailable
at org.cloudfoundry.client.lib.rest.CloudControllerResponseErrorHandler.handleError(CloudControllerResponseErrorHandler.java:26)
at org.cloudfoundry.client.lib.org.springframework.web.client.RestTemplate.handleResponseError(RestTemplate.java:589)
at org.cloudfoundry.client.lib.org.springframework.web.client.RestTemplate.doExecute(RestTemplate.java:547)
at org.cloudfoundry.client.lib.rest.LoggingRestTemplate.doExecute(LoggingRestTemplate.java:54)
at org.cloudfoundry.client.lib.org.springframework.web.client.RestTemplate.execute(RestTemplate.java:511)
at org.cloudfoundry.client.lib.org.springframework.web.client.RestTemplate.getForObject(RestTemplate.java:248)
at org.cloudfoundry.client.lib.rest.CloudControllerClientImpl.getInstanceInfoForApp(CloudControllerClientImpl.java:1154)
at org.cloudfoundry.client.lib.rest.CloudControllerClientImpl.doGetApplicationStats(CloudControllerClientImpl.java:1140)
at org.cloudfoundry.client.lib.rest.CloudControllerClientImpl.getRunningInstances(CloudControllerClientImpl.java:1119)
at org.cloudfoundry.client.lib.rest.CloudControllerClientImpl.mapCloudApplication(CloudControllerClientImpl.java:1107)
at org.cloudfoundry.client.lib.rest.CloudControllerClientImpl.getApplication(CloudControllerClientImpl.java:1075)
at org.cloudfoundry.client.lib.CloudFoundryClient.getApplication(CloudFoundryClient.java:226)
at com.hpe.cloudfoundryjenkins.CloudFoundryPushPublisher.processOneApp(CloudFoundryPushPublisher.java:287)
at com.hpe.cloudfoundryjenkins.CloudFoundryPushPublisher.perform(CloudFoundryPushPublisher.java:188)
at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20)
at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:779)
at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:726)
at hudson.model.Build$BuildExecution.post2(Build.java:185)
at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:671)
at hudson.model.Run.execute(Run.java:1766)
at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
at hudson.model.ResourceController.execute(ResourceController.java:98)
at hudson.model.Executor.run(Executor.java:408)
Build step 'Push to Cloud Foundry' marked build as failure
Finished: FAILURE