Merge pull request #459 from renaissance-benchmarks/issue/458

Set 'java.class.path' temporarily during Chronicle intialization

README.md

@@ -115,7 +115,7 @@ The following is the complete list of benchmarks, separated into groups.
 
 - `db-shootout` - Executes a shootout test using several in-memory databases.
   \
-  Default repetitions: 16; APACHE2 license, MIT distribution; Supported JVM: 11 - 22
+  Default repetitions: 16; APACHE2 license, MIT distribution; Supported JVM: 11 and later
 
 - `neo4j-analytics` - Executes Neo4j graph queries against a movie database.
   \

benchmarks/database/src/main/scala/org/renaissance/database/DbShootout.scala

@@ -10,11 +10,17 @@ import org.renaissance.BenchmarkResult
 import org.renaissance.BenchmarkResult.Validators
 import org.renaissance.License
 
+import java.io.File
+import java.net.URLClassLoader
+import java.nio.file.Files
+import java.nio.file.Path
+import java.nio.file.Paths
+import scala.collection.Seq
+
 @Name("db-shootout")
 @Group("database")
 @Summary("Executes a shootout test using several in-memory databases.")
 @Licenses(Array(License.APACHE2))
-@SupportsJvm("22") // Works on Java 24 in standalone mode.
 @Repetitions(16)
 @Parameter(name = "rw_entry_count", defaultValue = "500000")
 @Configuration(name = "test", settings = Array("rw_entry_count = 10000"))
@@ -49,6 +55,21 @@ final class DbShootout extends Benchmark {
 
   var mvStoreWriter: MvStore.Writer = _
 
+  private def buildChronicleClassPath(classPath: String): Seq[Path] = {
+    val elements = classPath.split(File.pathSeparatorChar).map(Paths.get(_)).toSeq
+    Thread.currentThread.getContextClassLoader match {
+      case ucl: URLClassLoader =>
+        ucl.getURLs.map(url => Paths.get(url.toURI)).filter { path =>
+          val fn = path.getFileName.toString
+          fn.startsWith("chronicle-core") || fn.startsWith("chronicle-bytes")
+        }
+      case _ =>
+        // Fall back to current class path.
+        // This should be the case in standalone mode.
+        elements
+    }
+  }
+
   override def setUpBeforeAll(c: BenchmarkContext): Unit = {
     val tempDirPath = c.scratchDirectory()
     val readWriteEntryCountParam = c.parameter("rw_entry_count").toPositiveInteger
@@ -59,12 +80,24 @@ final class DbShootout extends Benchmark {
     mapDbReader.setup(tempDirPath.toFile, readWriteEntryCountParam)
     mapDbWriter.setup(tempDirPath.toFile, readWriteEntryCountParam)
 
+    //
+    // Chronicle needs the 'java.class.path' property to contain certain jars because
+    // it is using the Java compiler to compile generated source code and expects the
+    // compiler to find libraries through the normal class path. It is enough to set
+    // the property during initialization.
+    //
+    val oldClassPath = System.getProperty("java.class.path")
+    val newClassPath = buildChronicleClassPath(oldClassPath).mkString(File.pathSeparator)
+    System.setProperty("java.class.path", newClassPath)
+
     chronicle = new Chronicle
     chronicleReader = new Chronicle.Reader
     chronicleWriter = new Chronicle.Writer
     chronicleReader.setup(tempDirPath.toFile, readWriteEntryCountParam)
     chronicleWriter.setup(tempDirPath.toFile, readWriteEntryCountParam)
 
+    System.setProperty("java.class.path", oldClassPath)
+
     mvStore = new MvStore
     mvStoreReader = new MvStore.Reader
     mvStoreWriter = new MvStore.Writer