scripting / eval 1

[stormbind]

Hi,

Can Java evaluate or execute strings as though they were miniature applications?


--Glen

Memoria mihi benigna erit qui eam perscribam

 

[feherke]

Hi

Yes, for example if you embed a script interpreter. I wish to have once time to learn to do such things with Rhino...

Feherke.

http://rootshell.be/~feherke/

 

[stormbind]

Humn. Well thank you for the reply - though it doesn't sound like very good news

The strings cannot be sandboxed or in another language, as I kind of wanted them to call Java methods.

--Glen

Memoria mihi benigna erit qui eam perscribam

 

[feherke]

Hi

With the Rhino library you extend/implement classes/interfaces to make them accessible from the JavaScript code. So the JavaScript syntax is just a wrapped around the real Java world.

Feherke.

http://rootshell.be/~feherke/

 

[Diancecht]

stormbind: could you explain more about what you're trying to do?

Maybe we can find a sollution without pure scripting.

Cheers,
Dian

 

[feherke]

Hi

Or you could think to something like JasperReports' solution. They store the report ( including expressions with own syntax and Java code ) in a an XML file. Then just convert the XML file into Java source code, compile it, load it and execute it.

Feherke.

http://rootshell.be/~feherke/

 

[timw]

... or have a look at Groovy

http://groovy.codehaus.org/Embedding+Groovy

Tim

 

[feherke]

Hi

... or have a look at any other embeddable language library

http://squidoo.com/scripting-java/

Feherke.

http://rootshell.be/~feherke/

 

[Diancecht]

What about the example?

Cheers,
Dian

 

[stormbind]

No worries. It was not as complicated as I had imagined

My objective was to inject new arbitrary code after the application is compiled and while it is running.

If you have some wonderfully elegant thoughts on that, please share them, but I now see a very simple workaround ;-)

--Glen

Memoria mihi benigna erit qui eam perscribam

 

[Diancecht]

Maybe some hot-replace would do the trick

http://java.sys-con.com/read/37659.htm

Cheers,
Dian