Remove deprecations from previous versions

* Remove Boon dependency and its usage
* Remove overloaded methods from the `IntegrationFlowDefinition`
- we can simply rely now on the super class
* Remove (or rework) deprecated entities in the docs
* Fix tests for removed deprecated APIs
* Rework affected tests to JUnit 5

build.gradle

@@ -50,7 +50,6 @@ ext {
 	assertjVersion = '3.14.0'
 	assertkVersion = '0.20'
 	awaitilityVersion = '4.0.1'
-	boonVersion = '0.34'
 	commonsDbcp2Version = '2.7.0'
 	commonsIoVersion = '2.6'
 	commonsNetVersion = '3.6'
@@ -411,7 +410,6 @@ project('spring-integration-core') {
 		api 'io.projectreactor:reactor-core'
 		optionalApi 'com.fasterxml.jackson.core:jackson-databind'
 		optionalApi "com.jayway.jsonpath:json-path:$jsonpathVersion"
-		optionalApi "io.fastjson:boon:$boonVersion"
 		optionalApi "com.esotericsoftware:kryo-shaded:$kryoShadedVersion"
 		optionalApi "io.micrometer:micrometer-core:$micrometerVersion"
 		optionalApi "io.github.resilience4j:resilience4j-ratelimiter:$resilience4jVersion"

spring-integration-amqp/src/main/java/org/springframework/integration/amqp/config/AmqpChannelFactoryBean.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -314,16 +314,6 @@ public void setTransactionManager(PlatformTransactionManager transactionManager)
 		this.transactionManager = transactionManager;
 	}
 
-	/**
-	 * Specify a batch size for consumer.
-	 * @param txSize the batch size to use
-	 * @deprecated since 5.2 in favor of {@link #setBatchSize(Integer)}
-	 */
-	@Deprecated
-	public void setTxSize(int txSize) {
-		setBatchSize(txSize);
-	}
-
 	public void setBatchSize(Integer batchSize) {
 		this.batchSize = batchSize;
 	}

spring-integration-amqp/src/main/java/org/springframework/integration/amqp/dsl/AmqpMessageChannelSpec.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2014-2019 the original author or authors.
+ * Copyright 2014-2020 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.
@@ -202,17 +202,6 @@ public S transactionManager(PlatformTransactionManager transactionManager) {
 		return _this();
 	}
 
-	/**
-	 * Configure the txSize.
-	 * @param txSize the txSize.
-	 * @return the spec.
-	 * @deprecated since 5.2 in favor of {@link #batchSize(int)}
-	 */
-	@Deprecated
-	public S txSize(int txSize) {
-		return batchSize(txSize);
-	}
-
 	/**
 	 * Configure the batch size.
 	 * @param batchSize the batchSize.

spring-integration-amqp/src/main/java/org/springframework/integration/amqp/dsl/SimpleMessageListenerContainerSpec.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2019 the original author or authors.
+ * Copyright 2017-2020 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.
@@ -107,17 +107,6 @@ public SimpleMessageListenerContainerSpec receiveTimeout(long receiveTimeout) {
 		return this;
 	}
 
-	/**
-	 * @param txSize the txSize.
-	 * @return the spec.
-	 * @see SimpleMessageListenerContainer#setBatchSize(int)
-	 * @deprecated since 5.2 in favor of {@link #batchSize(int)}
-	 */
-	@Deprecated
-	public SimpleMessageListenerContainerSpec txSize(int txSize) {
-		return batchSize(txSize);
-	}
-
 	/**
 	 * The batch size to use.
 	 * @param batchSize the batchSize.

spring-integration-core/src/main/java/org/springframework/integration/aop/MessagePublishingInterceptor.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -79,14 +79,6 @@ public MessagePublishingInterceptor(PublisherMetadataSource metadataSource) {
 		this.metadataSource = metadataSource;
 	}
 
-	/**
-	 * @param metadataSource the {@link PublisherMetadataSource} to use.
-	 * @deprecated since 5.2 in favor constructor argument.
-	 */
-	@Deprecated
-	public void setPublisherMetadataSource(PublisherMetadataSource metadataSource) {
-	}
-
 	/**
 	 * @param defaultChannelName the default channel name.
 	 * @since 4.0.3

spring-integration-core/src/main/java/org/springframework/integration/channel/AbstractMessageChannel.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2020 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.
@@ -51,6 +51,7 @@
 import org.springframework.messaging.MessageDeliveryException;
 import org.springframework.messaging.converter.MessageConverter;
 import org.springframework.messaging.support.ChannelInterceptor;
+import org.springframework.messaging.support.InterceptableChannel;
 import org.springframework.util.Assert;
 import org.springframework.util.StringUtils;
 
@@ -68,7 +69,7 @@
 @IntegrationManagedResource
 @SuppressWarnings("deprecation")
 public abstract class AbstractMessageChannel extends IntegrationObjectSupport
-		implements MessageChannel, TrackableComponent, ChannelInterceptorAware,
+		implements MessageChannel, TrackableComponent, InterceptableChannel,
 		org.springframework.integration.support.management.MessageChannelMetrics,
 		ConfigurableMetricsAware<AbstractMessageChannelMetrics>,
 		IntegrationPattern {

spring-integration-core/src/main/java/org/springframework/integration/channel/ExecutorChannelInterceptorAware.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2015-2019 the original author or authors.
+ * Copyright 2015-2020 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.
@@ -16,8 +16,10 @@
 
 package org.springframework.integration.channel;
 
+import org.springframework.messaging.support.InterceptableChannel;
+
 /**
- * The {@link ChannelInterceptorAware} extension for the cases when
+ * The {@link InterceptableChannel} extension for the cases when
  * the {@link org.springframework.messaging.support.ExecutorChannelInterceptor}s
  * may have reason (e.g. {@link ExecutorChannel} or {@link QueueChannel})
  * and the implementors require to know if they should make the
@@ -28,8 +30,7 @@
  *
  * @since 4.2
  */
-@SuppressWarnings("deprecation")
-public interface ExecutorChannelInterceptorAware extends ChannelInterceptorAware {
+public interface ExecutorChannelInterceptorAware extends InterceptableChannel {
 
 	boolean hasExecutorInterceptors();
 

spring-integration-core/src/main/java/org/springframework/integration/dsl/IntegrationFlowAdapter.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2016-2019 the original author or authors.
+ * Copyright 2016-2020 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.
@@ -179,32 +179,6 @@ protected IntegrationFlowDefinition<?> from(MessagingGatewaySpec<?, ?> inboundGa
 		return IntegrationFlows.from(inboundGatewaySpec);
 	}
 
-	/**
-	 * @param service service for polling method
-	 * @param methodName method to poll
-	 * @return the IntegrationFlowBuilder
-	 * @deprecated since 5.2 in favor of method reference via {@link #from(Supplier)}
-	 */
-	@Deprecated
-	protected IntegrationFlowBuilder from(Object service, String methodName) {
-		return IntegrationFlows.from(service, methodName);
-	}
-
-	/**
-	 *
-	 * @param service service for polling method
-	 * @param methodName method to poll
-	 * @param endpointConfigurer configurer for {@link SourcePollingChannelAdapterSpec}
-	 * @return the IntegrationFlowBuilder
-	 * @deprecated since 5.2 in favor of method reference via {@link #from(Supplier)}
-	 */
-	@Deprecated
-	protected IntegrationFlowBuilder from(Object service, String methodName,
-			Consumer<SourcePollingChannelAdapterSpec> endpointConfigurer) {
-
-		return IntegrationFlows.from(service, methodName, endpointConfigurer);
-	}
-
 	protected <T> IntegrationFlowBuilder from(Supplier<T> messageSource) {
 		return IntegrationFlows.from(messageSource);
 	}
@@ -219,18 +193,6 @@ protected IntegrationFlowBuilder from(Class<?> serviceInterface) {
 		return IntegrationFlows.from(serviceInterface);
 	}
 
-	/**
-	 * Start a flow from a proxy for the service interface.
-	 * @param serviceInterface  the service interface to proxy for the gateway.
-	 * @param beanName the bean name for the gateway proxy.
-	 * @return the {@link IntegrationFlowBuilder} instance
-	 * @deprecated since 5.2 in favor of {@link #from(Class, Consumer)}
-	 */
-	@Deprecated
-	protected IntegrationFlowBuilder from(Class<?> serviceInterface, @Nullable String beanName) {
-		return from(serviceInterface, (gateway) -> gateway.beanName(beanName));
-	}
-
 	/**
 	 * Start a flow from a proxy for the service interface.
 	 * @param serviceInterface the service interface class.