CommandLineMain has been compiled by a more recent version of the Java Runtime

[jedenastka]

Environment info

• BlockMap version: 1.6.1
• Java version:

openjdk version "11.0.6" 2020-01-14
OpenJDK Runtime Environment (build 11.0.6+10-post-Debian-2)
OpenJDK 64-Bit Server VM (build 11.0.6+10-post-Debian-2, mixed mode, sharing)

• Operating system:

Linux pecet 5.4.0-4-amd64 #1 SMP Debian 5.4.19-1 (2020-02-13) x86_64 GNU/Linux

Description

I can't run this program on Debian Sid.

Steps to reproduce

1. Install Debian Sid
2. Install openjdk-11-jre
3. Download the CLI version
4. Run it via java -jar $THE_JAR

Actual result

~/Pobrane $ java -jar BlockMap-cli-1.6.1.jar
Error: LinkageError occurred while loading main class de.piegames.blockmap.standalone.CommandLineMain
        java.lang.UnsupportedClassVersionError: de/piegames/blockmap/standalone/CommandLineMain has been compiled by a more recent version of the Java Runtime (class file version 56.0), this version of the Java Runtime only recognizes class file versions up to 55.0
~/Pobrane $

Expected result:

I don't know, I never used the program. But it should show me a help message, I think.

Debug log

Seems to not change anything. I probably shouldn't except anything, cause it's Java error...

~/Pobrane $ java -jar BlockMap-cli-1.6.1.jar -v                                    
Error: LinkageError occurred while loading main class de.piegames.blockmap.standalone.CommandLineMain
        java.lang.UnsupportedClassVersionError: de/piegames/blockmap/standalone/CommandLineMain has been compiled by a more recent version of the Java Runtime (class file version 56.0), this version of the Java Runtime only recognizes class file versions up to 55.0
~/Pobrane $ 

EDIT: I also tried to compile it. gradlew gave me error saying that the project is incompatible with latest version.

~/BlockMap $ ./gradlew regenerate
Downloading https://services.gradle.org/distributions/gradle-6.0.1-bin.zip
.........10%.........20%.........30%.........40%.........50%.........60%.........70%.........80%.........90%.........100%

Welcome to Gradle 6.0.1!

Here are the highlights of this release:
 - Substantial improvements in dependency management, including
   - Publishing Gradle Module Metadata in addition to pom.xml
   - Advanced control of transitive versions
   - Support for optional features and dependencies
   - Rules to tweak published metadata
 - Support for Java 13
 - Faster incremental Java and Groovy compilation
 - New Zinc compiler for Scala
 - VS2019 support
 - Support for Gradle Enterprise plugin 3.0

For more details see https://docs.gradle.org/6.0.1/release-notes.html

Starting a Gradle Daemon (subsequent builds will be faster)
> Task :BlockMap:BlockMap-core:compileJava FAILED
> Task :regenerate FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':BlockMap:BlockMap-core:compileJava'.
> Could not target platform: 'Java SE 12' using tool chain: 'JDK 11 (11)'.

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/6.0.1/userguide/command_line_interface.html#sec:command_line_warnings

BUILD FAILED in 2m 0s
1 actionable task: 1 executed
~/BlockMap $

EDIT 2: The same happens on Debian 10.
EDIT 3: Sorry, just noticed that I need Java 12 :/ Closing for now.

[piegamesde]

Yeah, I've done that mistake confusing Java 11 and 12 more than once :)