[fix] prioritize most frequently used JDKs when selecting the project JDK

CHANGELOG.md

@@ -4,6 +4,9 @@
 
 
 ## [Unreleased]
+### Fixes 🛠️
+-  Prioritize most frequently used JDKs when selecting the project JDK. 
+   | [#420](https://github.com/JetBrains/bazel-bsp/pull/420)
 
 ## [2.7.0]
 

server/src/main/java/org/jetbrains/bsp/bazel/server/sync/languages/java/JdkResolver.kt

@@ -11,7 +11,7 @@ class JdkResolver(
 ) {
 
   fun resolve(targets: Sequence<TargetInfo>): Jdk? {
-    val allCandidates = targets.mapNotNull { resolveJdkData(it) }.distinct().map { JdkCandidate(it) }
+    val allCandidates = targets.mapNotNull { resolveJdkData(it) }.sortByFrequency().map { JdkCandidate(it) }
     if (allCandidates.none()) return null
     val latestVersion = candidatesWithLatestVersion(allCandidates)
     val complete = allCandidates.filter { it.isComplete }
@@ -33,7 +33,6 @@ class JdkResolver(
       findLatestVersion(candidates)
         ?.let { version -> candidates.filter { it.version == version } }
         .orEmpty()
-        .sortedBy { it.javaHome.toString() } // for predictable results
 
   private fun findLatestVersion(candidates: Sequence<JdkCandidate>): String? =
       candidates.mapNotNull { it.version }.maxByOrNull { Integer.parseInt(it) }
@@ -76,4 +75,10 @@ class JdkResolver(
       val javaHome: URI?,
   )
 
+private fun <A> Sequence<A>.sortByFrequency(): Sequence<A> =
+      groupBy { it }.values
+        .sortedByDescending { it.size }
+        .map { it.first() }
+        .asSequence()
+
 }