Call javascript function from Java (Groovy) class

Question

I have a javascript function (very big one!) that I need its functionality in a Java (Groovy) class. It is a simple calendar converter. I can rewrite it in groovy but just want to know if it is possible to call javascript function from a java (groovy) method? I guess functional testing libraries like selenium and Canoo should have something like this, am I right? PS: I don't want to wake up a real-world browser in order to use its JS runtime env. Thanks,

Accepted Answer

As mentioned in the other answers, it is possible to use the Scripting API provided as part of the `javax.script` package, available from Java 6.

The following is a Groovy example which executes a little bit of Javascript:

```
import javax.script.*

manager = new ScriptEngineManager()
engine = manager.getEngineByName("JavaScript")

javascriptString = """
obj = {"value" : 42}
print(obj["value"])
"""

engine.eval(javascriptString)  // prints 42
```

It is not necessary to call a browser to execute Javascript when using the Scripting API, but one should keep in mind that browser-specific features (probably the DOM-related functionalities) will not be available.

Call javascript function from Java (Groovy) class

Solution

Problem