Expose prestartAllCoreThreads on ExecutorService

See gh-1246

spring-context/src/main/java/org/springframework/scheduling/concurrent/ThreadPoolExecutorFactoryBean.java

@@ -73,12 +73,14 @@ public class ThreadPoolExecutorFactoryBean extends ExecutorConfigurationSupport
 
 	private int keepAliveSeconds = 60;
 
-	private boolean allowCoreThreadTimeOut = false;
-
 	private int queueCapacity = Integer.MAX_VALUE;
 
+	private boolean allowCoreThreadTimeOut = false;
+
 	private boolean exposeUnconfigurableExecutor = false;
 
+	private boolean prestartAllCoreThreads = false;
+
 	@Nullable
 	private ExecutorService exposedExecutor;
 
@@ -130,6 +132,17 @@ public class ThreadPoolExecutorFactoryBean extends ExecutorConfigurationSupport
 		this.queueCapacity = queueCapacity;
 	}
 
+	/**
+	 * Specify whether this FactoryBean should prestart all threads
+	 * for the created executor.
+	 * <p>Default is "false".
+	 * Switch this flag to "true" to prestart the threads allocated for the current executor
+	 * @see java.util.concurrent.ThreadPoolExecutor#prestartAllCoreThreads
+	 */
+	public void setPrestartAllCoreThreads(boolean prestartAllCoreThreads) {
+		this.prestartAllCoreThreads = prestartAllCoreThreads;
+	}
+
 	/**
 	 * Specify whether this FactoryBean should expose an unconfigurable
 	 * decorator for the created executor.
@@ -154,6 +167,10 @@ public class ThreadPoolExecutorFactoryBean extends ExecutorConfigurationSupport
 			executor.allowCoreThreadTimeOut(true);
 		}
 
+		if (this.prestartAllCoreThreads) {
+			executor.prestartAllCoreThreads();
+		}
+
 		// Wrap executor with an unconfigurable decorator.
 		this.exposedExecutor = (this.exposeUnconfigurableExecutor ?
 				Executors.unconfigurableExecutorService(executor) : executor);