Java DSL

Simple expressions in Java DSL

In the Java DSL, there are two styles for using the simple() command in a route. You can either pass the simple() command as an argument to a processor, as follows:


Or you can call the simple() command as a sub-clause on the processor, for example:


Embedding in a string

If you are embedding a simple expression inside a plain text string, you must use the placeholder syntax, ${Expression}. For example, to embed the expression in a string:

simple("Hello ${}, how are you?")

Customizing the start and end tokens

From Java, you can customize the start and end tokens ({ and }, by default) by calling the changeFunctionStartToken static method and the changeFunctionEndToken static method on the SimpleLanguage object.

For example, you can change the start and end tokens to [ and ] in Java, as follows:

// Java
import org.apache.camel.language.simple.SimpleLanguage;

Customizing the start and end tokens affects all Apache Camel applications that share the same camel-core library on their classpath. For example, in an OSGi server this might affect many applications; whereas in a Web application (WAR file) it would affect only the Web application itself.