{"id":2095,"date":"2026-02-02T23:44:40","date_gmt":"2026-02-02T10:44:40","guid":{"rendered":"https:\/\/www.ronella.xyz\/?p=2095"},"modified":"2026-02-02T23:44:40","modified_gmt":"2026-02-02T10:44:40","slug":"apache-camel-route-templates-with-java-dsl","status":"publish","type":"post","link":"https:\/\/www.ronella.xyz\/?p=2095","title":{"rendered":"Apache Camel Route Templates with Java DSL"},"content":{"rendered":"

Apache Camel route templates in Java DSL let you define a reusable route \u201cshape\u201d and then create many concrete routes from it by supplying parameters. This avoids copy\u2011pasting similar routes and centralizes changes.<\/p>\n

\n

Core idea in Java DSL<\/h2>\n

In Java DSL, a route template is declared inside a RouteBuilder<\/code> using routeTemplate("id")<\/code> and a set of templateParameter(...)<\/code> entries. Placeholders like {{name}}<\/code> and {{period}}<\/code> inside the route definition are filled in when you create concrete routes from the template.<\/p>\n

Conceptually:
\n$$
\n\\text{routeTemplate("id")} + \\text{parameters} \\Rightarrow \\text{concrete route}
\n$$
\nThis separates what changes<\/em> (parameters) from what stays the same<\/em> (the processing steps), so you can add or modify routes by changing parameters instead of duplicating code.<\/p>\n

\n

Defining a route template<\/h2>\n

You define the template in a RouteBuilder<\/code> just like a normal route, but with routeTemplate<\/code> and templateParameter<\/code>.<\/p>\n

import org.apache.camel.builder.RouteBuilder;\n\n\/\/ Defines the route template using Java DSL\nstatic class MyRouteTemplates extends RouteBuilder {\n    @Override\n    public void configure() throws Exception {\n        routeTemplate("greetingTemplate")\n                .templateParameter("name")\n                .templateParameter("greeting")\n                .templateParameter("period", "3s")\n\n                .from("timer:{{name}}?period={{period}}")\n                .setBody(simple("{{greeting}} from route {{name}} at ${date:now:HH:mm:ss}"))\n                .log("${body}");\n    }\n}<\/code><\/pre>\n
Why it\u2019s structured like this:<\/p>\n