fix: replace deprecated returnResource() and add JedisPool shutdown hook

platform-core/platform-cache/src/main/scala/org/sunbird/cache/util/RedisConnector.scala

@@ -1,6 +1,7 @@
 package org.sunbird.cache.util
 
 import org.sunbird.common.Platform
+import org.sunbird.telemetry.logger.TelemetryManager
 import redis.clients.jedis.{Jedis, JedisPool, JedisPoolConfig}
 
 /**
@@ -14,6 +15,8 @@ trait RedisConnector {
 	private val INDEX = Platform.getInteger("redis.dbIndex", 0)
 	private val jedisPool: JedisPool = new JedisPool(getConfig(), HOST, PORT)
 
+	registerShutdownHook()
+
 	/**
 	 * This Method Returns a connection object from connection pool.
 	 *
@@ -28,21 +31,45 @@ trait RedisConnector {
 	}
 
 	/**
-	 * This Method takes a connection object and put it back to pool.
+	 * This Method takes a connection object and returns it to pool.
+	 * Uses jedis.close() which is the modern, non-deprecated approach
+	 * and correctly returns the connection to the pool (or closes it if broken).
 	 *
 	 * @param jedis
 	 */
 	protected def returnConnection(jedis: Jedis): Unit = {
-		try if (null != jedis) jedisPool.returnResource(jedis)
-		catch {
-			case e: Exception => throw e
+		if (null != jedis) {
+			try jedis.close()
+			catch {
+				case e: Exception => TelemetryManager.error("Error returning Redis connection to pool: " + e.getMessage, e)
+			}
+		}
+	}
+
+	/**
+	 * Closes the JedisPool, releasing all connections.
+	 * Called automatically via the JVM shutdown hook.
+	 */
+	def closePool(): Unit = {
+		if (jedisPool != null && !jedisPool.isClosed) {
+			try jedisPool.close()
+			catch {
+				case e: Exception => TelemetryManager.error("Error closing JedisPool: " + e.getMessage, e)
+			}
 		}
 	}
 
+	private def registerShutdownHook(): Unit = {
+		Runtime.getRuntime.addShutdownHook(new Thread(() => {
+			TelemetryManager.log("Shutting down RedisConnector — closing connection pool")
+			closePool()
+		}))
+	}
+
 	private def getConfig(): JedisPoolConfig = {
 		val config: JedisPoolConfig = new JedisPoolConfig()
 		config.setMaxTotal(MAX_CONNECTIONS)
-		config.setBlockWhenExhausted(true);
+		config.setBlockWhenExhausted(true)
 		config
 	}
 }