bndmanifest and java-library intermodule dependencies

[nedtwigg]

In diffplug/durian-swt@496386e I used java-library in a multi-module project, and I declared an api dependency on another module within the project. I then saw intermittent errors like this:

> Task :durian-swt:jar FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':durian-swt:jar'.
> A Jar can only accept a file or directory that exists: /home/travis/build/diffplug/durian-swt/durian-swt.os/build/libs/durian-swt.os-3.3.0.jar

The workaround is diffplug/durian-swt@b3df331

[loetifuss]

I'm experiencing the same error after switching from biz.aQute.bnd.builder to the bndmanifest plugin.
The problem is that the java-library plugin has a dependency on the class-folder of dependent modules instead of the jar (as it used to be in Gradle before).
Thus, the jar-task of a module may be executed before any of the dependent JARs have been built.

Workaround: You can force Gradle to use the "old" behaviour of depending on JARs by adding the following switch
-Dorg.gradle.java.compile-classpath-packaging=true

It would be great though if the plugin can be adjusted to the new behaviour.