feat(engine): switch to JAR-bundled native library loading

Replace manual native library path management with JAR-bundled native
library from slatedb/slatedb#1329. NativeLibraryLoader automatically
extracts and loads the platform-specific library from classpath resources.

- Remove SlateDb.loadLibrary(path) calls (API removed in upstream PR)
- Use SlateDb.initLogging(SlateDbConfig.LogLevel.INFO) for initialization
- Remove libraryPath from SlateDbOptions, SlateDbConnections, tests, and config
- Remove working directory hack in server bootRun task

Tested: all 4 SlateDB test suites pass (SlateDbTableTest, SlateDbStorageTest,
SlateDbHashLabelTest, SlateDbIndexedLabelTest)

Author: em3s

engine/src/main/kotlin/com/kakao/actionbase/v2/engine/storage/slatedb/SlateDbConnections.kt

@@ -6,34 +6,33 @@ import java.util.concurrent.ConcurrentHashMap
 import java.util.concurrent.atomic.AtomicBoolean
 
 import io.slatedb.SlateDb
+import io.slatedb.SlateDbConfig
 import reactor.core.publisher.Mono
 import reactor.core.scheduler.Schedulers
 
 object SlateDbConnections {
     private val logger = getLogger()
 
-    private val libraryLoaded = AtomicBoolean(false)
+    private val initialized = AtomicBoolean(false)
     private val connections: ConcurrentHashMap<String, Mono<SlateDbTable>> = ConcurrentHashMap()
 
-    fun loadLibrary(libraryPath: String) {
-        if (libraryLoaded.compareAndSet(false, true)) {
-            logger.info("Loading SlateDB native library from: {}", libraryPath)
-            SlateDb.loadLibrary(libraryPath)
-            SlateDb.initLogging("info")
+    fun ensureInitialized() {
+        if (initialized.compareAndSet(false, true)) {
+            logger.info("Initializing SlateDB (native library loaded from JAR classpath)")
+            SlateDb.initLogging(SlateDbConfig.LogLevel.INFO)
         }
     }
 
     fun getConnection(
         dbPath: String,
         url: String,
-        libraryPath: String,
     ): Mono<SlateDbTable> {
         val cacheKey = getCacheKey(dbPath, url)
 
         return connections.computeIfAbsent(cacheKey) { key ->
             Mono
                 .fromCallable {
-                    loadLibrary(libraryPath)
+                    ensureInitialized()
                     val db = SlateDb.open(dbPath, url, null)
                     SlateDbTable.create(db)
                 }.subscribeOn(Schedulers.boundedElastic())

engine/src/main/kotlin/com/kakao/actionbase/v2/engine/storage/slatedb/SlateDbOptions.kt

@@ -8,10 +8,9 @@ import reactor.core.publisher.Mono
 data class SlateDbOptions(
     val path: String = "data",
     val url: String = "",
-    val libraryPath: String = "",
 ) {
     fun checkConnection(): Mono<Boolean> =
-        if (url.isBlank() || libraryPath.isBlank()) {
+        if (url.isBlank()) {
             Mono.just(false)
         } else {
             Mono.just(true)
@@ -21,6 +20,5 @@ data class SlateDbOptions(
         SlateDbConnections.getConnection(
             dbPath = path,
             url = url,
-            libraryPath = libraryPath,
         )
 }

engine/src/test/kotlin/com/kakao/actionbase/engine/datastore/SlateDBDatastoreCompatibilityTest.kt

@@ -14,12 +14,12 @@ import org.junit.jupiter.api.TestInstance
 import org.junit.jupiter.api.io.TempDir
 
 import io.slatedb.SlateDb
+import io.slatedb.SlateDbConfig
 
 /**
  * SlateDB compatibility test.
  *
  * Disabled by default. Set SLATEDB_TEST=true to run.
- * Requires native library: native/lib/libslatedb_c.dylib (macOS) or libslatedb_c.so (Linux)
  *
  * To run:
  *   SLATEDB_TEST=true ./gradlew :engine:test --tests "*SlateDBDatastoreCompatibilityTest*"
@@ -37,7 +37,7 @@ class SlateDBDatastoreCompatibilityTest : DatastoreCompatibilityTest() {
     ) {
         assumeTrue(enabled, "SLATEDB_TEST=true not set")
         tempDir = dir
-        SlateDb.loadLibrary(findLibraryPath())
+        SlateDb.initLogging(SlateDbConfig.LogLevel.INFO)
         val db = SlateDb.open("data", "file://${tempDir.toAbsolutePath()}", null)
         table = SlateDbTable.create(db)
     }
@@ -59,20 +59,6 @@ class SlateDBDatastoreCompatibilityTest : DatastoreCompatibilityTest() {
         }
     }
 
-    private fun findLibraryPath(): String {
-        var dir = Path.of(System.getProperty("user.dir"))
-        while (!dir.resolve("settings.gradle.kts").toFile().exists() && dir.parent != null) {
-            dir = dir.parent
-        }
-        val libName =
-            if (System.getProperty("os.name").lowercase().contains("linux")) {
-                "libslatedb_c.so"
-            } else {
-                "libslatedb_c.dylib"
-            }
-        return dir.resolve("native/lib/$libName").toAbsolutePath().toString()
-    }
-
     private class SlateDBOperations(
         private val table: SlateDbTable,
     ) : StorageOperations {

engine/src/test/kotlin/com/kakao/actionbase/v2/engine/label/slatedb/SlateDbHashLabelTest.kt

@@ -26,7 +26,6 @@ import java.nio.file.Path
 import java.util.UUID
 
 import org.junit.jupiter.api.AfterEach
-import org.junit.jupiter.api.Assumptions.assumeTrue
 import org.junit.jupiter.api.BeforeEach
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.io.TempDir
@@ -45,14 +44,6 @@ class SlateDbHashLabelTest {
     private val storageName = "slatedb_storage"
     private val labelName = "slatedb_label"
 
-    private fun findLibraryPath(): Path {
-        var dir = Path.of(System.getProperty("user.dir"))
-        while (!dir.resolve("settings.gradle.kts").toFile().exists() && dir.parent != null) {
-            dir = dir.parent
-        }
-        return dir.resolve("native/lib/libslatedb_c.dylib")
-    }
-
     private fun createGraph(): Graph {
         val config =
             GraphConfig
@@ -64,9 +55,6 @@ class SlateDbHashLabelTest {
 
     @BeforeEach
     fun setUp() {
-        // Skip test if native library not found
-        assumeTrue(findLibraryPath().toFile().exists(), "SlateDB native library not found")
-
         graph = createGraph()
         graph.updateAllMetadata().block()
 
@@ -82,7 +70,6 @@ class SlateDbHashLabelTest {
             jacksonObjectMapper().createObjectNode().apply {
                 put("path", "test-data")
                 put("url", "file://${tempDir.toAbsolutePath()}")
-                put("libraryPath", findLibraryPath().toString())
             }
 
         graph.storageDdl

engine/src/test/kotlin/com/kakao/actionbase/v2/engine/label/slatedb/SlateDbIndexedLabelTest.kt

@@ -28,7 +28,6 @@ import java.nio.file.Path
 import java.util.UUID
 
 import org.junit.jupiter.api.AfterEach
-import org.junit.jupiter.api.Assumptions.assumeTrue
 import org.junit.jupiter.api.BeforeEach
 import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.io.TempDir
@@ -47,14 +46,6 @@ class SlateDbIndexedLabelTest {
     private val storageName = "slatedb_indexed_storage"
     private val labelName = "slatedb_indexed_label"
 
-    private fun findLibraryPath(): Path {
-        var dir = Path.of(System.getProperty("user.dir"))
-        while (!dir.resolve("settings.gradle.kts").toFile().exists() && dir.parent != null) {
-            dir = dir.parent
-        }
-        return dir.resolve("native/lib/libslatedb_c.dylib")
-    }
-
     private fun createGraph(): Graph {
         val config =
             GraphConfig
@@ -66,9 +57,6 @@ class SlateDbIndexedLabelTest {
 
     @BeforeEach
     fun setUp() {
-        // Skip test if native library not found
-        assumeTrue(findLibraryPath().toFile().exists(), "SlateDB native library not found")
-
         graph = createGraph()
         graph.updateAllMetadata().block()
 
@@ -84,7 +72,6 @@ class SlateDbIndexedLabelTest {
             jacksonObjectMapper().createObjectNode().apply {
                 put("path", "test-data")
                 put("url", "file://${tempDir.toAbsolutePath()}")
-                put("libraryPath", findLibraryPath().toString())
             }
 
         graph.storageDdl

engine/src/test/kotlin/com/kakao/actionbase/v2/engine/storage/slatedb/SlateDbStorageTest.kt

@@ -49,7 +49,6 @@ class SlateDbStorageTest {
             jacksonObjectMapper().createObjectNode().apply {
                 put("path", "test-data")
                 put("url", "file:///tmp/slatedb-test")
-                put("libraryPath", "native/lib/libslatedb_c.dylib")
             }
 
         GraphFixtures.createStorage(graph, "slatedb_test", StorageType.SLATEDB, conf)

engine/src/test/kotlin/com/kakao/actionbase/v2/engine/storage/slatedb/SlateDbTableTest.kt

@@ -10,6 +10,7 @@ import org.junit.jupiter.api.Test
 import org.junit.jupiter.api.io.TempDir
 
 import io.slatedb.SlateDb
+import io.slatedb.SlateDbConfig
 import reactor.test.StepVerifier
 
 class SlateDbTableTest {
@@ -18,24 +19,9 @@ class SlateDbTableTest {
 
     private lateinit var table: SlateDbTable
 
-    private fun findLibraryPath(): String {
-        var dir = Path.of(System.getProperty("user.dir"))
-        while (!dir.resolve("settings.gradle.kts").toFile().exists() && dir.parent != null) {
-            dir = dir.parent
-        }
-        val libName =
-            if (System.getProperty("os.name").lowercase().contains("linux")) {
-                "libslatedb_c.so"
-            } else {
-                "libslatedb_c.dylib"
-            }
-        return dir.resolve("native/lib/$libName").toAbsolutePath().toString()
-    }
-
     @BeforeEach
     fun setUp() {
-        val libraryPath = findLibraryPath()
-        SlateDb.loadLibrary(libraryPath)
+        SlateDb.initLogging(SlateDbConfig.LogLevel.INFO)
 
         val fileUrl = "file://${tempDir.toAbsolutePath()}"
         val dbPath = "data"

server/build.gradle.kts

@@ -89,8 +89,6 @@ tasks.named<org.springframework.boot.gradle.tasks.run.BootRun>("bootRun") {
             languageVersion.set(JavaLanguageVersion.of(25))
         }
     )
-    // Set working directory to project root for SlateDB native library path resolution
-    workingDir = rootProject.projectDir
 }
 
 jib {

server/src/main/resources/application-slatedb.yaml

@@ -1,9 +1,7 @@
 # SlateDB storage profile
 # Usage: --spring.profiles.active=slatedb
 #
-# Prerequisites:
-# 1. Build slatedb-c: ./native/build-slatedb.sh
-# 2. Set library path via environment variable or update libraryPath below
+# Native library is bundled in the slatedb JAR (loaded automatically from classpath).
 
 actionbase:
   tenant: ab-slatedb
@@ -15,4 +13,3 @@ kc:
       conf:
         path: data
         url: file://${SLATEDB_STORAGE_PATH:/tmp/actionbase-slatedb}
-        libraryPath: ${SLATEDB_LIBRARY_PATH:native/lib/libslatedb_c.dylib}