Updated libraries to able compile to java 8

build.gradle.kts

@@ -31,14 +31,15 @@ xomrk {
 		jvm {
 			withJava()
 
-			/*compilations.configureEach {
+			compilations.configureEach {
 				compileJavaTaskProvider?.configure {
+					sourceCompatibility  = "1.8"
 					targetCompatibility  = "1.8"
 				}
 				compileTaskProvider.configure {
 					compilerOptions { jvmTarget = JvmTarget.JVM_1_8 }
 				}
-			}*/
+			}
 		}
 
 		sourceSets {
@@ -47,8 +48,8 @@ xomrk {
 					compileOnly("org.jetbrains:annotations:26.0.2")
 					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")
+					implementation("ru.landgrafhomyak.utility:highlevel-try-finally:0.5")
+					implementation("ru.landgrafhomyak.utility:reference-counter:0.2")
 				}
 			}
 		}

src/jvmMain/kotlin/ru/langrafhomyak/db/jdbc_resources_manager/PreparedStatementWrapper.kt

@@ -31,18 +31,16 @@ internal abstract class PreparedStatementWrapper(@JvmField protected val _orig:
 	private val _refcnt = CloseableReferenceCounter("This prepared statement was returned to pool to be used in future")
 	private var _currentQuery: ResultSetWrapper? = null
 	private var _closeOnCompletion: Boolean = false
-	private var _isClosed = false
 
 	@Throws(SQLException::class)
 	protected abstract fun _onClose()
 
 	override fun close() {
 		this._refcnt.close("Can't close prepared statement while it's in use")
-		this._isClosed = true
 		this._onClose()
 	}
 
-	override fun isClosed(): Boolean = this._isClosed
+	override fun isClosed(): Boolean = this._refcnt.isClosed
 
 	override fun closeOnCompletion() =
 		this._refcnt.withRef { this._closeOnCompletion = true }