GH-1148 Copy the context ObjectMapper before modifying it

Resolves #1162

spring-cloud-function-context/src/main/java/org/springframework/cloud/function/context/config/ContextFunctionCatalogAutoConfiguration.java

@@ -216,12 +216,12 @@ private JsonMapper gson(ApplicationContext context) {
  private JsonMapper jackson(ApplicationContext context) {
  ObjectMapper mapper;
  try {
- mapper = context.getBean(ObjectMapper.class);
+ mapper = context.getBean(ObjectMapper.class).copy();
  }
  catch (Exception e) {
  mapper = new ObjectMapper();
  }
- mapper.registerModule(new JavaTimeModule());
+ mapper.registerModule(new JavaTimeModule());
  mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
  mapper.configure(DeserializationFeature.FAIL_ON_TRAILING_TOKENS, true);
  mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);