Compilation currently broken about blangsdk

[alexandrebouchard]

eclipse-jdt/eclipse.jdt.core#2252

[alexandrebouchard]

Example:

./gradlew build

gives:

java.lang.UnsupportedClassVersionError: org/eclipse/core/runtime/OperationCanceledException 
has been compiled by a more recent version of the Java Runtime (class file version 61.0), this version of the Java Runtime only recognizes class file versions up to 55.0

[alexandrebouchard]

While trying to upgrade to 17 seems a large undertaking, tried many times before. E.g. just starting with gradle scripts, they do not support 17, and upgrading gradle creates many errors.

[alexandrebouchard]

Got more info with -d for debug mode

./gradlew -d build | grep core | grep eclipse

just before the crash:

2024-03-29T21:27:07.233-0700 [DEBUG] [org.gradle.api.internal.artifacts.ivyservice.ivyresolve.RepositoryChainComponentMetaDataResolver] Using org.eclipse.emf:org.eclipse.emf.ecore:2.20.0 from Maven repository 'MavenRepo'

So current suspect is culpit is org.eclipse.emf:org.eclipse.emf.ecore:2.20.0

[alexandrebouchard]

Idea: force downgrading it:

https://docs.gradle.org/6.8.3/userguide/dependency_downgrade_and_exclude.html

Example:

dependencies {
    implementation 'org.apache.httpcomponents:httpclient:4.5.4'
    implementation('commons-codec:commons-codec') {
        version {
            strictly '1.9'
        }
    }
}

[alexandrebouchard]

Datapoint: also fails with ./setup-eclipse.sh

Perhaps problem is with the plugin?

[alexandrebouchard]

Digging into the gradle cache to find culpits...

version-of-jar.sh:

#!/bin/bash

rm -r ~/tmp/decompress
mkdir ~/tmp/decompress
cp $1 ~/tmp/decompress 
cd ~/tmp/decompress 
unzip -qq *.jar
grep Bundle-RequiredExecutionEnvironment META-INF/MANIFEST.MF 
cd - > /dev/null

version-of-jars.sh:

#!/bin/bash

for i in `find . -type f -name "*.jar"`
do
	echo $i --- `version-of-jar.sh $i`
done

Deleted .gradle, then running once, then
From ~.gradle/caches/modules-2/files-2.1,

version-of-jars.sh  | grep JavaSE-17

got:

./org.eclipse.platform/org.eclipse.equinox.registry/3.12.0/d873328963eee04833540334b9868a4b5894f1fa/org.eclipse.equinox.registry-3.12.0.jar --- Bundle-RequiredExecutionEnvironment: JavaSE-17
./org.eclipse.platform/org.eclipse.core.runtime/3.31.0/b815a6f4da0be97526bfe7d915054e80f2bc8197/org.eclipse.core.runtime-3.31.0.jar --- Bundle-RequiredExecutionEnvironment: JavaSE-17
./org.eclipse.platform/org.eclipse.equinox.app/1.7.0/27ad31338c942b3b8ff693780b99514f25257940/org.eclipse.equinox.app-1.7.0.jar --- Bundle-RequiredExecutionEnvironment: JavaSE-17
./org.eclipse.platform/org.eclipse.core.resources/3.20.100/6dd19c7161f9d5965394f70d7d32ff8238bdff6f/org.eclipse.core.resources-3.20.100.jar --- Bundle-RequiredExecutionEnvironment: JavaSE-17
./org.eclipse.platform/org.eclipse.equinox.preferences/3.11.0/94a74fb01448da1df6a0f7e896bdd2b337683745/org.eclipse.equinox.preferences-3.11.0.jar --- Bundle-RequiredExecutionEnvironment: JavaSE-17
./org.eclipse.platform/org.eclipse.equinox.common/3.19.0/5b6633ba85fc1c59a6024e1068a2a0a39458445d/org.eclipse.equinox.common-3.19.0.jar --- Bundle-RequiredExecutionEnvironment: JavaSE-17
./org.eclipse.platform/org.eclipse.core.commands/3.12.0/d1604534d74b8119e905f58b929f3b10940c43be/org.eclipse.core.commands-3.12.0.jar --- Bundle-RequiredExecutionEnvironment: JavaSE-17
./org.eclipse.platform/org.eclipse.core.jobs/3.15.200/6d32405156e9732768b3374bfb2bdcc4f49f0c54/org.eclipse.core.jobs-3.15.200.jar --- Bundle-RequiredExecutionEnvironment: JavaSE-17
./org.eclipse.platform/org.eclipse.text/3.14.0/8e3578da612c813d7bb062a0a6d548b948b20a8d/org.eclipse.text-3.14.0.jar --- Bundle-RequiredExecutionEnvironment: JavaSE-17
./org.eclipse.platform/org.eclipse.core.contenttype/3.9.300/a4670d530c7b4c2ba6d2374947d7e8bdb027d2ac/org.eclipse.core.contenttype-3.9.300.jar --- Bundle-RequiredExecutionEnvironment: JavaSE-17
./org.eclipse.platform/org.eclipse.core.expressions/3.9.300/62eeac77a1db70866cab80d3948052cd472bca82/org.eclipse.core.expressions-3.9.300.jar --- Bundle-RequiredExecutionEnvironment: JavaSE-17
./org.eclipse.platform/org.eclipse.core.filesystem/1.10.300/9bc848bd15920f3f01336496fee25c4fb2095a5f/org.eclipse.core.filesystem-1.10.300.jar --- Bundle-RequiredExecutionEnvironment: JavaSE-17

So we have narrowed down the exact culpits. Now who import those?

[alexandrebouchard]

From ./gradlew dependencies, it is clear that e.g. org.eclipse.core.runtime gets resolved to 3.7.0, not 3.31.0.

HOWEVER, on Maven Central, the earliest version available is 3.12.0, so maybe old versions got purged.

https://repo1.maven.org/maven2/org/eclipse/platform/org.eclipse.core.runtime/

https://mvnrepository.com/artifact/org.eclipse.platform/org.eclipse.core.runtime

[alexandrebouchard]

For future occurrence of something like this, we now have an internal back up of a full gradle cache (working-gradle-cache-for-blang-sdk.zip)