How do you invoke a method from a Java class from IzPack? Static methods are OK, and I need to be able to pass it parameters.
Thank you!
Background info:
I am trying to write an IzPack installer which is able to detect a previously installed versions of the application. After finding out that it doesn't really support this feature (except in Windows), I think the only way to do this is through writing a Java class and calling it from IzPack.
Tim Williscroft has previously suggested this method, that reads the value of a static field of a class:
<condition type="java" id="jbossEnv">
<java>
<class>au.com.codarra.ela.installer.JBossChecker</class
<field>hasJBossEnv</field>
</java>
<returnvalue type="boolean">true</returnvalue>
</condition>
However, is it possible to call <java> from somewhere other than a <condition> tag? I want to be able to call it from a <variable> tag.
Also, is it possible to call a method from a Java class instead of reading a value of a field? I want to be able to pass parameters to my class.