JDime does not build under Java 8 or Java 11

[mernst]

I tried to use the following commands to install JDime:

mkdir -p ~/tmp
cd ~/tmp
rm -rf jdime JNativeMerge
git clone https://github.com/se-sic/jdime.git
cd jdime
./gradlew installDist

Under Java 8, I get the error:

FAILURE: Build failed with an exception.

* What went wrong:
org/eclipse/jgit/storage/file/FileRepositoryBuilder has been compiled by a more recent version of the Java Runtime (class file version 55.0), this version of the Java Runtime only recognizes class file versions up to 52.0

Running ./gradlew --debug installDist gives (among voluminous other output):

[DEBUG] [org.gradle.api.internal.artifacts.ivyservice.ivyresolve.DynamicVersionResolver] Attempting to resolve version for org.eclipse.jgit:org.eclipse.jgit:[4.8.0.201706111038-r,) using repositories [Gradle Central Plugin Repository]
[DEBUG] [org.gradle.cache.internal.DefaultCacheAccess] Creating new cache for metadata-2.53/module-versions, path /home/mernst/.gradle/caches/modules-2/metadata-2.53/module-versions.bin, access org.gradle.cache.internal.DefaultCacheAccess@3bfeacf
[DEBUG] [org.gradle.cache.internal.btree.BTreePersistentIndexedCache] Opening cache module-versions.bin (/home/mernst/.gradle/caches/modules-2/metadata-2.53/module-versions.bin)
[DEBUG] [org.gradle.api.internal.artifacts.ivyservice.ivyresolve.CachingModuleComponentRepository] Using cached module metadata for module 'org.eclipse.jgit:org.eclipse.jgit:6.7.0.202309050840-r' in 'Gradle Central Plugin Repository'
[DEBUG] [org.gradle.api.internal.artifacts.ivyservice.ivyresolve.DynamicVersionResolver] Using org.eclipse.jgit:org.eclipse.jgit:6.7.0.202309050840-r from Maven repository 'Gradle Central Plugin Repository'
[DEBUG] [org.gradle.api.internal.artifacts.ivyservice.ivyresolve.DynamicVersionResolver] Attempting to resolve version for org.eclipse.jgit:org.eclipse.jgit.ui:[4.8.0.201706111038-r,) using repositories [Gradle Central Plugin Repository]
[DEBUG] [org.gradle.api.internal.artifacts.ivyservice.ivyresolve.CachingModuleComponentRepository] Using cached module metadata for module 'org.eclipse.jgit:org.eclipse.jgit.ui:6.7.0.202309050840-r' in 'Gradle Central Plugin Repository'
...
[DEBUG] [org.gradle.internal.component.model.ComponentAttributeMatcher] Selected match org.eclipse.jgit:org.eclipse.jgit.ui:6.7.0.202309050840-r configuration runtime from candidates [org.eclipse.jgit:org.eclipse.jgit.ui:6.7.0.202309050840-r configuration runtime] for {}
[DEBUG] [org.gradle.internal.component.model.ComponentAttributeMatcher] Selected match org.eclipse.jgit:org.eclipse.jgit:6.7.0.202309050840-r configuration runtime from candidates [org.eclipse.jgit:org.eclipse.jgit:6.7.0.202309050840-r configuration runtime] for {}

Class file version 55.0 corresponds to Java 11, so I tried building under Java 11, but that gave a different error:

* What went wrong:
Could not determine java version from '11.0.20.1'.

[GSeibt]

Hi,

not sure about Could not determine java version from '11.0.20.1'. but I updated the develop branch to use Gradle 8.4 and the latest plugins + dependencies. I am using Java 11 for running Gradle and Gradle downloads Java 8 (Temurin) for building now.

Works for me. Can you give it a try?

Also, please use the develop branch. I set that as the default now.

Best,
Georg

[mernst]

Georg, thanks for your reply.

Unfortunately, I am still suffering this error when running ./gradlew installDist:

* What went wrong:
Could not determine the dependencies of task ':installDist'.
> Could not resolve all dependencies for configuration ':runtimeClasspath'.
   > Failed to calculate the value of task ':compileJava' property 'javaCompiler'.
      > No matching toolchains found for requested specification: {languageVersion=8, vendor=ADOPTIUM, implementation=vendor-specific} for LINUX on x86_64.
         > No locally installed toolchains match and toolchain download repositories have not been configured.

Here is how you can reproduce the prolem:

docker run -it adoptopenjdk/openjdk11 /bin/bash
apt-get update
apt install -yq git
git clone -q https://github.com/se-sic/jdime /tmp/jdime
cd /tmp/jdime
which java && java -version
./gradlew -q installDist

[GSeibt]

Hm, seems one has to configure how to download toolchains now. I added the appropriate plugin on the development branch.

[mernst]

That worked, thanks.