diff --git a/.changeset/pink-starfishes-turn.md b/.changeset/pink-starfishes-turn.md
new file mode 100644
index 00000000..345d10c9
--- /dev/null
+++ b/.changeset/pink-starfishes-turn.md
@@ -0,0 +1,7 @@
+---
+"@openapi-generator-plus/java-jaxrs-server-generator": minor
+---
+
+Make AbstractApiJaxbJsonProvider more customisable in code.
+
+Rather than relying on replacing a Handlebars frag.
diff --git a/packages/java-jaxrs-server/templates/AbstractApiJaxbJsonProvider.hbs b/packages/java-jaxrs-server/templates/AbstractApiJaxbJsonProvider.hbs
index 294bcbc5..c6a3440f 100644
--- a/packages/java-jaxrs-server/templates/AbstractApiJaxbJsonProvider.hbs
+++ b/packages/java-jaxrs-server/templates/AbstractApiJaxbJsonProvider.hbs
@@ -10,7 +10,37 @@ public abstract class AbstractApiJaxbJsonProvider extends com.fasterxml.jackson.
 	}
 
 	protected com.fasterxml.jackson.databind.ObjectMapper createMapper() {
-		{{>frag/jaxbJsonProviderBody}}
+		com.fasterxml.jackson.databind.ObjectMapper mapper = new com.fasterxml.jackson.databind.ObjectMapper();
+
+		/* We don't serialise null values so the client can treat them as null or undefined as they see fit */
+		mapper.setSerializationInclusion(com.fasterxml.jackson.annotation.JsonInclude.Include.NON_NULL);
+
+		/* Support PATCH requests using java.util.Optional */
+		if (isRegisterJdk8Module()) {
+			mapper.registerModule(createJdk8Module());
+		}
+
+		/* Support Java time object types */
+		mapper.registerModule(createJavaTimeModule());
+		mapper.configure(com.fasterxml.jackson.databind.SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, isWriteDatesAsTimestamps());
+
+		return mapper;
+	}
+
+	protected boolean isRegisterJdk8Module() {
+		return true;
+	}
+
+	protected com.fasterxml.jackson.datatype.jdk8.Jdk8Module createJdk8Module() {
+		return new com.fasterxml.jackson.datatype.jdk8.Jdk8Module();
+	}
+
+	protected com.fasterxml.jackson.datatype.jsr310.JavaTimeModule createJavaTimeModule() {
+		return new com.fasterxml.jackson.datatype.jsr310.JavaTimeModule();
+	} 
+
+	protected boolean isWriteDatesAsTimestamps() {
+		return false;
 	}
 
 }
diff --git a/packages/java-jaxrs-server/templates/frag/jaxbJsonProviderBody.hbs b/packages/java-jaxrs-server/templates/frag/jaxbJsonProviderBody.hbs
deleted file mode 100644
index 4bc5e637..00000000
--- a/packages/java-jaxrs-server/templates/frag/jaxbJsonProviderBody.hbs
+++ /dev/null
@@ -1,13 +0,0 @@
-com.fasterxml.jackson.databind.ObjectMapper mapper = new com.fasterxml.jackson.databind.ObjectMapper();
-
-/* We don't serialise null values so the client can treat them as null or undefined as they see fit */
-mapper.setSerializationInclusion(com.fasterxml.jackson.annotation.JsonInclude.Include.NON_NULL);
-
-/* Support PATCH requests using java.util.Optional */
-mapper.registerModule(new com.fasterxml.jackson.datatype.jdk8.Jdk8Module());
-
-/* Support Java time object types */
-mapper.registerModule(new com.fasterxml.jackson.datatype.jsr310.JavaTimeModule());
-mapper.configure(com.fasterxml.jackson.databind.SerializationFeature.WRITE_DATES_AS_TIMESTAMPS, false);
-
-return mapper;