Application-Info: A Java repository from ksereda

Application Info

Get application version from Manifest file

Start

First you need to write Groovy script for autoincrement your application version into build.gradle file:

 tasks.register("incrementVersion") {
     doFirst {
         def ver = version
         println ver
         String lastNumber = ver.substring(ver.lastIndexOf('.') + 1)
         int increment = lastNumber.toInteger() + 1
         println increment
 
         String firstNumber = ver.substring(0, ver.lastIndexOf("."))
         println firstNumber
         String result = buildFile.getText().replaceFirst("version='$version'","version='" + firstNumber + "." + increment + "'")
         buildFile.setText(result)
     }
 }

You must specify the dependence of your task incrementVersion in relation to the build gradle task. Those, when performing the build gradle task, your incrementVersion task will be executed first and thus the new value will be stored in your build.gradle file.

jar.dependsOn incrementVersion
bootJar.dependsOn incrementVersion

or simply

build.dependsOn incrementVersion

Then you need to write what you need to display into your jar file in MANIFEST.MF file:

bootJar {
    doFirst {
        manifest {
            attributes(
                    'Main-Class': 'com.example.appinfo.AppinfoApplication',
                    'Implementation-Title': 'Application Info project',
                    'Implementation-Version': "${version}"
            )
        }
    }
}

Indicate your original version:

version='0.0.5'

Then you need to write backend logic to get this application version, when your jar file will be ready:

 public String getManifestInfo() {
     return getClass().getPackage().getImplementationVersion();
 }

For example I created simple controller for check version.

How to check

in terminal:
```
  gradle build
```

You can see your version will be increment.

Your MANIFEST file will be on:

/build/tmp/bootJar/MANIFEST.MF

Your jar file will be on:

/build/libs/

You can see my MANIFEST.MF file after creation new build:

Manifest-Version: 1.0
Implementation-Title: Application Info project
Implementation-Version: 0.0.4
Start-Class: com.example.ApplicationInfo.ApplicationInfoApplication
Spring-Boot-Classes: BOOT-INF/classes/
Spring-Boot-Lib: BOOT-INF/lib/
Spring-Boot-Version: 2.1.6.RELEASE
Main-Class: com.example.appinfo.AppinfoApplication

Exactly the same file will be in your jar file.

then start your jar file from command line
go to localhost:8080/info

You will see application version from MANIFEST.MF file from jar.

NOTES:

If you will repeat this operations you will see autoincrement application version (+1)

ksereda/Application-Info