Incompatibility with JDK 16

[Toffikk]

Please check the User Guide before submitting "how do I do 'x'?" questions!

Shadow Version

6.1.0

Gradle Version

7.0-rc-2

Expected Behavior

The task shadowjar working when using JDK 16 , works when using JDK 15

Actual Behavior

It failes

The stacktrace: https://gist.github.com/tofikarz/0b3ae6e45316bbc825acb3d175677ed1

[m8nmueller]

Hi, this is fixed in #655 which will come with Shadow version 6.2.0

[Toffikk]

When it will be released? and is it possible to use the snapshot builds? if yes then how?

[m8nmueller]

I don't know the release date but you can clone the repository and build it yourself.
Just add something like

repositories {
    maven {
       name = 'buildRepo'
       url = "file://${buildDir}/repo"
   }
}

to the publishing block in gradle/publish.gradle and build with gradle publishPluginPublicationToBuildRepoRepository.

One more thing: I don't know why but it seems that Oracle has changed their API URL (javadoc task failing with javadoc: error - Error fetching URL: http://docs.oracle.com/javase/1.7.0/docs/api/). I could at least silence that error by changing the javaApiUrl in gradle/docs.gradle from http://docs.oracle.com/javase/1.7.0/docs/api to http://docs.oracle.com/javase/7/docs/api.

You can apply the locally built plugin with:

buildscript {
  repositories {
    maven {
      url "file:///path/to/shadow/build/repo/"
    }
  }
  dependencies {
    classpath "com.github.jengelman.gradle.plugins:shadow:6.2.0-SNAPSHOT"
  }
}
apply plugin: "com.github.johnrengelman.shadow"

[m8nmueller]

And if you want to build the plugin with Gradle 7, you'll have to wait for #657 to be merged, apply that patch manually or clone from my master branch.

[t3rmian]

Alternatively, you can use Gradle 6.8.3 with JDK 16 by configuring Java Toolchain.

[pacher]

+1
Gradle 7 is released. Would be really great to get some info on when Shadow 6.2.0 is planning to be released or how to get snapshot builds.

[pacher]

@MaxM123 As an alternative to building locally, is it possible to use jitpack.io to install shadow snapshot from your master until 6.2.0 is released?

[m8nmueller]

Good idea. Worked for me by adding the following to settings.gradle:

buildscript {
  repositories {
    gradlePluginPortal()
    maven {
      url 'https://jitpack.io'
    }
  }

  dependencies {
    classpath 'com.github.maxm123:shadow:master-SNAPSHOT'
  }
}

and apply plugin: 'com.github.johnrengelman.shadow' to build.gradle.

[fcurts]

You could do us a big favor by releasing the fix for this issue, which blocks us from testing our project against JDK 16 on CI. jitpack.io is not an option for us (blocked).