diff --git a/build.gradle.kts b/build.gradle.kts
index e9e53b9..694affc 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -46,7 +46,6 @@ xomrk {
 				dependencies {
 					compileOnly("org.jetbrains:annotations:26.0.2")
 					compileOnly("com.intellij:annotations:9.0.4")
-					compileOnly("com.intellij:annotations:9.0.4")
 					implementation("it.unimi.dsi:fastutil:6.3")
 					implementation("ru.landgrafhomyak.utility:highlevel-try-finally:0.4")
 					implementation("ru.landgrafhomyak.utility:reference-counter:0.1")
diff --git a/sandbox/build.gradle.kts b/sandbox/build.gradle.kts
new file mode 100644
index 0000000..1d434c2
--- /dev/null
+++ b/sandbox/build.gradle.kts
@@ -0,0 +1,21 @@
+import ru.landgrafhomyak.kotlin.kmp_gradle_build_helper.plugin.xomrk
+
+repositories {
+	mavenCentral()
+	maven("https://maven.landgrafhomyak.ru/")
+}
+
+xomrk {
+	kotlin {
+		jvm {}
+
+		sourceSets {
+			jvmMain {
+				dependencies {
+					implementation(project(":"))
+					implementation("org.xerial:sqlite-jdbc:3.49.1.0")
+				}
+			}
+		}
+	}
+}
\ No newline at end of file
diff --git a/sandbox/src/commonMain/kotlin/main.kt b/sandbox/src/commonMain/kotlin/main.kt
new file mode 100644
index 0000000..6bacc5d
--- /dev/null
+++ b/sandbox/src/commonMain/kotlin/main.kt
@@ -0,0 +1,19 @@
+import java.sql.DriverManager
+import ru.langrafhomyak.db.jdbc_resources_manager.PreparedStatementsCompilationPhantomCache
+
+val someStmt = PreparedStatementsCompilationPhantomCache("SELECT * FROM sqlite_master")
+
+fun main() {
+	for (i in 0..10) {
+		DriverManager.getConnection("jdbc:sqlite::memory:").use { connection ->
+			someStmt.preparedStatementForConnection(connection).use { ps ->
+				ps.executeQuery().use { rs ->
+					while (rs.next()) {
+						println(rs.getString(0))
+					}
+				}
+			}
+		}
+		System.gc()
+	}
+}
\ No newline at end of file
diff --git a/settings.gradle.kts b/settings.gradle.kts
index f179ae0..732ef58 100644
--- a/settings.gradle.kts
+++ b/settings.gradle.kts
@@ -1,4 +1,3 @@
-plugins {
-	id("org.gradle.toolchains.foojay-resolver-convention") version "0.8.0"
-}
-rootProject.name = "jdbc-resources-manager"
\ No newline at end of file
+rootProject.name = "jdbc-resources-manager"
+
+include(":sandbox")
\ No newline at end of file
diff --git a/src/jvmMain/java/ru/langrafhomyak/db/jdbc_resources_manager/PreparedStatementsCompilationPhantomCache.java b/src/jvmMain/java/ru/langrafhomyak/db/jdbc_resources_manager/PreparedStatementsCompilationPhantomCache.java
index e36bd4f..dc4c832 100644
--- a/src/jvmMain/java/ru/langrafhomyak/db/jdbc_resources_manager/PreparedStatementsCompilationPhantomCache.java
+++ b/src/jvmMain/java/ru/langrafhomyak/db/jdbc_resources_manager/PreparedStatementsCompilationPhantomCache.java
@@ -23,7 +23,7 @@ public class PreparedStatementsCompilationPhantomCache /*implements ReadOnlyProp
 	}
 
 	@NotNull
-	PreparedStatement preparedStatementForConnection(@NotNull Connection connection) throws SQLException {
+	public PreparedStatement preparedStatementForConnection(@NotNull Connection connection) throws SQLException {
 		final int key = identityHashCode(connection);
 		ConnectionsMapNode node = this._map.get(key, connection);
 		if (node == null) {
diff --git a/src/jvmMain/kotlin/ru/langrafhomyak/db/jdbc_resources_manager/_PhantomCacheCleanup.kt b/src/jvmMain/kotlin/ru/langrafhomyak/db/jdbc_resources_manager/_PhantomCacheCleanup.kt
index dfe1942..e3fb003 100644
--- a/src/jvmMain/kotlin/ru/langrafhomyak/db/jdbc_resources_manager/_PhantomCacheCleanup.kt
+++ b/src/jvmMain/kotlin/ru/langrafhomyak/db/jdbc_resources_manager/_PhantomCacheCleanup.kt
@@ -10,6 +10,9 @@ internal object _PhantomCacheCleanup {
 	private val _virtualThreadProperty = "ru.langrafhomyak.db.jdbc_resources_manager._PhantomCacheCleanup.USE_VIRTUAL_THREAD"
 	private val _referenceQueue = ReferenceQueue<Any?>()
 
+	@Suppress("MAY_BE_CONST")
+	private val _threadName = "ru.langrafhomyak.db.jdbc_resources_manager._PhantomCacheCleanup"
+
 
 	init {
 		if (this._isVirtualThreadsSupported() && System.getProperty(this._virtualThreadProperty)?.lowercase() != "false")
@@ -27,9 +30,6 @@ internal object _PhantomCacheCleanup {
 		}
 	}
 
-	@Suppress("MAY_BE_CONST")
-	private val _threadName = "ru.langrafhomyak.db.jdbc_resources_manager._PhantomCacheCleanup"
-
 	private fun _startSystemThreadBeforeJ21(): Thread {
 		val t = Thread(
 			null,