Manifest expression injection

We already programmed manifest attributes in MANIFEST.MF. Now we will learn how to do manifest expression injection.

1. The easiest way to do manifest expression injection is to use gradle/groovy capabilities. Add new instruction to jar/manifest in "build.gradle":

instruction 'Project-Info', "${project.name} compiled on ${new Date()}"

2. Invoke on command line:

gradle build

3. Open file "tutorials/MyOsgiPlugin/build/libs/MyOsgiPlugin-1.0.0.0.jar", open "META-INF/MANIFEST.MF", it should contain:

Project-Info: MyOsgiPlugin compiled on Fri Apr 25 12:46:22 CEST 2014

4. We can also program expression injection in "META-INF/MANIFEST.MF". Edit the file "tutorials/MyOsgiPlugin/src/main/resources/META-INF/MANIFEST.MF",