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java.lang.IllegalArgumentException: URI must not be null at org.springframework.util.Assert.notNull(Assert.java:134)[spring-core-4.3.10.RELEASE.jar:4.3.10.RELEASE] at org.springframework.web.util.UriComponentsBuilder.fromUriString(UriComponentsBuilder.java:189)[spring-web-4.3.10.RELEASE.jar:4.3.10.RELEASE] at org.springframework.web.util.DefaultUriTemplateHandler.initUriComponentsBuilder(DefaultUriTemplateHandler.java:114)[spring-web-4.3.10.RELEASE.jar:4.3.10.RELEASE] at org.springframework.web.util.DefaultUriTemplateHandler.expandInternal(DefaultUriTemplateHandler.java:103)[spring-web-4.3.10.RELEASE.jar:4.3.10.RELEASE] at org.springframework.web.util.AbstractUriTemplateHandler.expand(AbstractUriTemplateHandler.java:106)[spring-web-4.3.10.RELEASE.jar:4.3.10.RELEASE] at org.springframework.web.client.RestTemplate.execute(RestTemplate.java:612)[spring-web-4.3.10.RELEASE.jar:4.3.10.RELEASE] at org.springframework.web.client.RestTemplate.postForEntity(RestTemplate.java:407)[spring-web-4.3.10.RELEASE.jar:4.3.10.RELEASE]