Add EmptyLineSeparator Checkstyle rule

* Support "blank lines around" via `spring-framework.xml` IDEA config
* Fix all the Checkstyle violations

spring-integration-scripting/src/main/java/org/springframework/integration/scripting/AbstractScriptExecutingMessageProcessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -57,7 +57,6 @@ public abstract class AbstractScriptExecutingMessageProcessor<T>
 		this.scriptVariableGenerator = scriptVariableGenerator;
 	}
 
-
 	@Override
 	public void setBeanClassLoader(ClassLoader classLoader) {
 		this.beanClassLoader = classLoader;

spring-integration-scripting/src/main/java/org/springframework/integration/scripting/DefaultScriptVariableGenerator.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -36,7 +36,6 @@ public class DefaultScriptVariableGenerator implements ScriptVariableGenerator {
 
 	private final Map<String, Object> variableMap;
 
-
 	public DefaultScriptVariableGenerator() {
 		this.variableMap = Collections.<String, Object>emptyMap();
 	}
@@ -45,7 +44,6 @@ public class DefaultScriptVariableGenerator implements ScriptVariableGenerator {
 		this.variableMap = variableMap;
 	}
 
-
 	public Map<String, Object> generateScriptVariables(Message<?> message) {
 		Map<String, Object> scriptVariables = new HashMap<String, Object>();
 		// Add Message content

spring-integration-scripting/src/main/java/org/springframework/integration/scripting/RefreshableResourceScriptSource.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -43,7 +43,6 @@ public class RefreshableResourceScriptSource implements ScriptSource {
 
 	private volatile String script;
 
-
 	public RefreshableResourceScriptSource(Resource resource, long refreshDelay) {
 		this.refreshDelay = refreshDelay;
 		this.source = new ResourceScriptSource(resource);

spring-integration-scripting/src/main/java/org/springframework/integration/scripting/ScriptExecutingMessageSource.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2013-2019 the original author or authors.
+ * Copyright 2013-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -44,4 +44,5 @@ public class ScriptExecutingMessageSource extends AbstractMessageSource<Object>
 	protected Object doReceive() {
 		return this.scriptMessageProcessor.processMessage(null);
 	}
+
 }

spring-integration-scripting/src/main/java/org/springframework/integration/scripting/ScriptingException.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -30,8 +30,8 @@ public class ScriptingException extends MessagingException {
 		super(description);
 	}
 
-
 	public ScriptingException(String description, Throwable cause) {
 		super(description, cause);
 	}
+
 }

spring-integration-scripting/src/main/java/org/springframework/integration/scripting/dsl/DslScriptExecutingMessageProcessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2023 the original author or authors.
+ * Copyright 2016-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -99,7 +99,6 @@ class DslScriptExecutingMessageProcessor
 			this.script = this.applicationContext.getResource(this.location);
 		}
 
-
 		if (!StringUtils.hasText(this.lang)) {
 			String scriptFilename = this.script.getFilename();
 			Assert.hasText(scriptFilename,

spring-integration-scripting/src/main/java/org/springframework/integration/scripting/dsl/ScriptSpec.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2023 the original author or authors.
+ * Copyright 2016-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -125,7 +125,6 @@ public class ScriptSpec extends MessageProcessorSpec<ScriptSpec> {
 		return this;
 	}
 
-
 	@Override
 	protected MessageProcessor<?> doGet() {
 		if (this.variableGenerator == null) {

spring-integration-scripting/src/main/java/org/springframework/integration/scripting/jsr223/PythonScriptExecutor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -57,11 +57,14 @@ public class PythonScriptExecutor extends AbstractScriptExecutor {
 	}
 
 	public static class PythonVariableParser {
+
 		public static String parseReturnVariable(String script) {
 			String[] lines = script.trim().split("\n");
 			String lastLine = lines[lines.length - 1];
 			String[] tokens = lastLine.split("=");
 			return tokens[0].trim();
 		}
+
 	}
+
 }

spring-integration-scripting/src/main/java/org/springframework/integration/scripting/jsr223/ScriptExecutingMessageProcessor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2024 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -42,7 +42,6 @@ public class ScriptExecutingMessageProcessor extends AbstractScriptExecutingMess
 
 	private final ScriptSource scriptSource;
 
-
 	/**
 	 * Create a processor for the {@link ScriptSource} using the provided
 	 * {@link ScriptExecutor} using the DefaultScriptVariableGenerator
@@ -83,7 +82,6 @@ public class ScriptExecutingMessageProcessor extends AbstractScriptExecutingMess
 		this(scriptSource, new DefaultScriptVariableGenerator(variables), scriptExecutor);
 	}
 
-
 	@Override
 	protected ScriptSource getScriptSource(Message<?> message) {
 		return this.scriptSource;