Spring IntegrationFlow Http.inboundGateway ambiguous parameter type - spring

Question

I'm trying to convert the following spring integration sample to a Java Config version. https://github.com/dsyer/http-amqp-tunnel
We need a slightly modified version of this project to work in a production environment. My problem is that I keep getting the following exception when starting the application.
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'httpInboundGateway' defined in org.springframework.platform.proxy.TunnelApplication: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.integration.dsl.IntegrationFlow]: Factory method 'httpInboundGateway' threw exception; nested exception is java.lang.IllegalArgumentException: Found ambiguous parameter type [class [Ljava.lang.String;] for method match: [public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.multipartResolver(org.springframework.web.multipart.MultipartResolver), public org.springframework.integration.dsl.core.MessagingGatewaySpec org.springframework.integration.dsl.core.MessagingGatewaySpec.replyMapper(org.springframework.integration.mapping.OutboundMessageMapper), public org.springframework.integration.dsl.core.MessagingGatewaySpec org.springframework.integration.dsl.core.MessagingGatewaySpec.autoStartup(boolean), public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.mappedResponseHeaders(java.lang.String[]), public org.springframework.integration.dsl.core.MessagingGatewaySpec org.springframework.integration.dsl.core.MessagingGatewaySpec.phase(int), public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.crossOrigin(org.springframework.integration.dsl.support.Consumer), public org.springframework.integration.dsl.core.MessagingGatewaySpec org.springframework.integration.dsl.core.MessagingGatewaySpec.errorChannel(java.lang.String), public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.headerMapper(org.springframework.integration.mapping.HeaderMapper), public org.springframework.integration.dsl.core.MessagingGatewaySpec org.springframework.integration.dsl.core.MessagingGatewaySpec.requestMapper(org.springframework.integration.mapping.InboundMessageMapper), public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.messageConverters(org.springframework.http.converter.HttpMessageConverter[]), public org.springframework.integration.dsl.core.MessagingGatewaySpec org.springframework.integration.dsl.core.MessagingGatewaySpec.requestTimeout(long), public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.payloadExpression(org.springframework.expression.Expression), public java.lang.Class org.springframework.integration.dsl.core.IntegrationComponentSpec.getObjectType(), public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.requestPayloadType(java.lang.Class), public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.payloadFunction(org.springframework.integration.dsl.support.Function), public org.springframework.integration.dsl.core.MessagingGatewaySpec org.springframework.integration.dsl.core.MessagingGatewaySpec.errorChannel(org.springframework.messaging.MessageChannel)]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:599) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1173) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1067) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:513) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:761) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:866) ~[spring-context-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542) ~[spring-context-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.1.RELEASE.jar:1.5.1.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:737) [spring-boot-1.5.1.RELEASE.jar:1.5.1.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370) [spring-boot-1.5.1.RELEASE.jar:1.5.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:314) [spring-boot-1.5.1.RELEASE.jar:1.5.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162) [spring-boot-1.5.1.RELEASE.jar:1.5.1.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151) [spring-boot-1.5.1.RELEASE.jar:1.5.1.RELEASE]
at org.springframework.platform.proxy.TestServerApplication.main(TestServerApplication.java:11) [classes/:na]
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.integration.dsl.IntegrationFlow]: Factory method 'httpInboundGateway' threw exception; nested exception is java.lang.IllegalArgumentException: Found ambiguous parameter type [class [Ljava.lang.String;] for method match: [public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.multipartResolver(org.springframework.web.multipart.MultipartResolver), public org.springframework.integration.dsl.core.MessagingGatewaySpec org.springframework.integration.dsl.core.MessagingGatewaySpec.replyMapper(org.springframework.integration.mapping.OutboundMessageMapper), public org.springframework.integration.dsl.core.MessagingGatewaySpec org.springframework.integration.dsl.core.MessagingGatewaySpec.autoStartup(boolean), public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.mappedResponseHeaders(java.lang.String[]), public org.springframework.integration.dsl.core.MessagingGatewaySpec org.springframework.integration.dsl.core.MessagingGatewaySpec.phase(int), public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.crossOrigin(org.springframework.integration.dsl.support.Consumer), public org.springframework.integration.dsl.core.MessagingGatewaySpec org.springframework.integration.dsl.core.MessagingGatewaySpec.errorChannel(java.lang.String), public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.headerMapper(org.springframework.integration.mapping.HeaderMapper), public org.springframework.integration.dsl.core.MessagingGatewaySpec org.springframework.integration.dsl.core.MessagingGatewaySpec.requestMapper(org.springframework.integration.mapping.InboundMessageMapper), public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.messageConverters(org.springframework.http.converter.HttpMessageConverter[]), public org.springframework.integration.dsl.core.MessagingGatewaySpec org.springframework.integration.dsl.core.MessagingGatewaySpec.requestTimeout(long), public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.payloadExpression(org.springframework.expression.Expression), public java.lang.Class org.springframework.integration.dsl.core.IntegrationComponentSpec.getObjectType(), public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.requestPayloadType(java.lang.Class), public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.payloadFunction(org.springframework.integration.dsl.support.Function), public org.springframework.integration.dsl.core.MessagingGatewaySpec org.springframework.integration.dsl.core.MessagingGatewaySpec.errorChannel(org.springframework.messaging.MessageChannel)]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:189) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:588) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
... 18 common frames omitted
Caused by: java.lang.IllegalArgumentException: Found ambiguous parameter type [class [Ljava.lang.String;] for method match: [public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.multipartResolver(org.springframework.web.multipart.MultipartResolver), public org.springframework.integration.dsl.core.MessagingGatewaySpec org.springframework.integration.dsl.core.MessagingGatewaySpec.replyMapper(org.springframework.integration.mapping.OutboundMessageMapper), public org.springframework.integration.dsl.core.MessagingGatewaySpec org.springframework.integration.dsl.core.MessagingGatewaySpec.autoStartup(boolean), public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.mappedResponseHeaders(java.lang.String[]), public org.springframework.integration.dsl.core.MessagingGatewaySpec org.springframework.integration.dsl.core.MessagingGatewaySpec.phase(int), public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.crossOrigin(org.springframework.integration.dsl.support.Consumer), public org.springframework.integration.dsl.core.MessagingGatewaySpec org.springframework.integration.dsl.core.MessagingGatewaySpec.errorChannel(java.lang.String), public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.headerMapper(org.springframework.integration.mapping.HeaderMapper), public org.springframework.integration.dsl.core.MessagingGatewaySpec org.springframework.integration.dsl.core.MessagingGatewaySpec.requestMapper(org.springframework.integration.mapping.InboundMessageMapper), public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.messageConverters(org.springframework.http.converter.HttpMessageConverter[]), public org.springframework.integration.dsl.core.MessagingGatewaySpec org.springframework.integration.dsl.core.MessagingGatewaySpec.requestTimeout(long), public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.payloadExpression(org.springframework.expression.Expression), public java.lang.Class org.springframework.integration.dsl.core.IntegrationComponentSpec.getObjectType(), public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.requestPayloadType(java.lang.Class), public org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec org.springframework.integration.dsl.http.BaseHttpInboundEndpointSpec.payloadFunction(org.springframework.integration.dsl.support.Function), public org.springframework.integration.dsl.core.MessagingGatewaySpec org.springframework.integration.dsl.core.MessagingGatewaySpec.errorChannel(org.springframework.messaging.MessageChannel)]
at org.springframework.util.Assert.isNull(Assert.java:92) ~[spring-core-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.integration.util.MessagingMethodInvokerHelper.findHandlerMethodsForTarget(MessagingMethodInvokerHelper.java:497) ~[spring-integration-core-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.integration.util.MessagingMethodInvokerHelper.<init>(MessagingMethodInvokerHelper.java:226) ~[spring-integration-core-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.integration.util.MessagingMethodInvokerHelper.<init>(MessagingMethodInvokerHelper.java:149) ~[spring-integration-core-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.integration.util.MessagingMethodInvokerHelper.<init>(MessagingMethodInvokerHelper.java:144) ~[spring-integration-core-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.integration.handler.MethodInvokingMessageProcessor.<init>(MethodInvokingMessageProcessor.java:60) ~[spring-integration-core-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.integration.handler.ServiceActivatingHandler.<init>(ServiceActivatingHandler.java:37) ~[spring-integration-core-4.3.7.RELEASE.jar:4.3.7.RELEASE]
at org.springframework.integration.dsl.IntegrationFlowDefinition.handle(IntegrationFlowDefinition.java:985) ~[spring-integration-java-dsl-1.2.1.RELEASE.jar:na]
at org.springframework.integration.dsl.IntegrationFlowDefinition.handle(IntegrationFlowDefinition.java:964) ~[spring-integration-java-dsl-1.2.1.RELEASE.jar:na]
at org.springframework.integration.dsl.IntegrationFlowDefinition.handle(IntegrationFlowDefinition.java:950) ~[spring-integration-java-dsl-1.2.1.RELEASE.jar:na]
at org.springframework.platform.proxy.TunnelApplication.httpInboundGateway(TunnelApplication.java:93) ~[classes/:na]
at org.springframework.platform.proxy.TunnelApplication$$EnhancerBySpringCGLIB$$4e2cc6e6.CGLIB$httpInboundGateway$3(<generated>) ~[classes/:na]
at org.springframework.platform.proxy.TunnelApplication$$EnhancerBySpringCGLIB$$4e2cc6e6$$FastClassBySpringCGLIB$$e8c73d4b.invoke(<generated>) ~[classes/:na]
at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) ~[spring-core-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:356) ~[spring-context-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.platform.proxy.TunnelApplication$$EnhancerBySpringCGLIB$$4e2cc6e6.httpInboundGateway(<generated>) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_66]
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_66]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:1.8.0_66]
at java.lang.reflect.Method.invoke(Unknown Source) ~[na:1.8.0_66]
at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:162) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
... 19 common frames omitted
Here's my modified version of TunnelApplication. The original can be found in the project link above.
package org.springframework.platform.proxy;
import org.springframework.amqp.core.*;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.support.converter.Jackson2JsonMessageConverter;
import org.springframework.beans.factory.annotation.*;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.*;
import org.springframework.integration.config.EnableIntegration;
import org.springframework.integration.dsl.*;
import org.springframework.integration.dsl.amqp.Amqp;
import org.springframework.integration.dsl.http.Http;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.context.support.HttpRequestHandlerServlet;
#Configuration
#ComponentScan
#EnableAutoConfiguration
#EnableIntegration
public class TunnelApplication
{
public static void main(String[] args)
{
SpringApplication.run(TunnelApplication.class, args);
}
#Value("${urlExpression}")
private String urlExpression;
#Value("${outboundQueue}")
private String outboundQueue;
#Value("${inboundQueue}")
private String inboundQueue;
#Autowired
private ConnectionFactory rabbitConnectionFactory;
#Bean
public Queue requestQueue()
{
return new Queue(outboundQueue, true, false, true);
}
#Bean
public Queue targetQueue()
{
return new Queue(inboundQueue, true, false, true);
}
#Bean
public ServletRegistrationBean httpInboundGatewayServletRegistration()
{
ServletRegistrationBean bean = new ServletRegistrationBean(httpInboundGatewayServlet(), "/tunnel/*");
bean.setName("httpInboundGateway");
return bean;
}
#Bean
public HttpRequestHandlerServlet httpInboundGatewayServlet()
{
return new HttpRequestHandlerServlet();
}
#Bean
public RestTemplate safeRestTemplate()
{
return new RestTemplate();
}
#Bean
public Jackson2JsonMessageConverter jsonMessageConverter()
{
return new Jackson2JsonMessageConverter();
}
#Bean
public AmqpTemplate amqpTemplate()
{
RabbitTemplate result = new RabbitTemplate(rabbitConnectionFactory);
result.setMessageConverter(jsonMessageConverter());
return result;
}
#Bean
public IntegrationFlow httpInboundGateway()
{
return IntegrationFlows.from("outbound")
.handle(Http.inboundGateway("/tunnel"))
.get();
}
#Bean
public IntegrationFlow amqpOutbound(AmqpTemplate amqpTemplate)
{
return IntegrationFlows.from("outbound")
.handle(
Amqp.outboundAdapter(amqpTemplate)
.mappedRequestHeaders("http_*")
.routingKeyExpression("headers['routingKey']")
)
.get();
}
#Bean
public IntegrationFlow amqpInboundGateway(ConnectionFactory connectionFactory)
{
return IntegrationFlows.from("inbound").handle
(
Amqp.inboundGateway(connectionFactory, inboundQueue)
.mappedRequestHeaders("http_*")
.messageConverter(jsonMessageConverter())
)
.get();
}
#Bean
public IntegrationFlow httpOutboundGateway()
{
return IntegrationFlows.from("inbound").handle(Http.outboundGateway(urlExpression)).get();
}
}
When I run TunnelApplication I get the above error. My maven pom file has been modified as follows. The main difference being that I'm using spring boot 1.5.1 and the original project uses 1.1.4.BUILD-SNAPSHOT.
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>com.redi</groupId>
<artifactId>redi-parent</artifactId>
<version>5.0.0</version>
</parent>
<artifactId>http-amqp-tunnel</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>HTTP AMQP Tunnel</name>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.5.1.RELEASE</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-integration</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.integration</groupId>
<artifactId>spring-integration-amqp</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.integration</groupId>
<artifactId>spring-integration-http</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.integration</groupId>
<artifactId>spring-integration-jmx</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<start-class>org.springframework.platform.proxy.TunnelApplication</start-class>
<java.version>1.8</java.version>
</properties>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
I'd really appreciate some guidance. This is my first spring integration project and I feel like I'm close.
Thanks in advance for your help.
Revised Configuration
package org.springframework.platform.proxy;
import org.springframework.amqp.core.*;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.amqp.support.converter.Jackson2JsonMessageConverter;
import org.springframework.beans.factory.annotation.*;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.web.servlet.ServletRegistrationBean;
import org.springframework.context.annotation.*;
import org.springframework.integration.config.EnableIntegration;
import org.springframework.integration.dsl.*;
import org.springframework.integration.dsl.amqp.Amqp;
import org.springframework.integration.dsl.http.Http;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.context.support.HttpRequestHandlerServlet;
#Configuration
#ComponentScan
#EnableAutoConfiguration
#EnableIntegration
public class TunnelApplication
{
public static void main(String[] args)
{
SpringApplication.run(TunnelApplication.class, args);
}
#Value("${urlExpression}")
private String urlExpression;
#Value("${outboundQueue}")
private String outboundQueue;
#Value("${inboundQueue}")
private String inboundQueue;
#Autowired
private ConnectionFactory rabbitConnectionFactory;
#Bean
public Queue requestQueue()
{
return new Queue(outboundQueue, true, false, true);
}
#Bean
public Queue targetQueue()
{
return new Queue(inboundQueue, true, false, true);
}
#Bean
public ServletRegistrationBean httpInboundGatewayServletRegistration()
{
ServletRegistrationBean bean = new ServletRegistrationBean(httpInboundGatewayServlet(), "/tunnel/*");
bean.setName("httpInboundGateway");
return bean;
}
#Bean
public HttpRequestHandlerServlet httpInboundGatewayServlet()
{
return new HttpRequestHandlerServlet();
}
#Bean
public RestTemplate safeRestTemplate()
{
return new RestTemplate();
}
#Bean
public Jackson2JsonMessageConverter jsonMessageConverter()
{
return new Jackson2JsonMessageConverter();
}
#Bean
public AmqpTemplate amqpTemplate()
{
RabbitTemplate result = new RabbitTemplate(rabbitConnectionFactory);
result.setMessageConverter(jsonMessageConverter());
return result;
}
#Bean
public IntegrationFlow httpInboundGateway()
{
return IntegrationFlows.from(Http.inboundGateway("/tunnel")).channel("outbound")
.get();
}
#Bean
public IntegrationFlow amqpOutbound(AmqpTemplate amqpTemplate)
{
return IntegrationFlows.from("outbound")
.handle(
Amqp.outboundAdapter(amqpTemplate)
.mappedRequestHeaders("http_*")
.routingKeyExpression("headers['routingKey']")
)
.get();
}
#Bean
public IntegrationFlow amqpInboundGateway(ConnectionFactory connectionFactory)
{
return IntegrationFlows.from
(
Amqp.inboundGateway(connectionFactory, inboundQueue)
.mappedRequestHeaders("http_*")
.messageConverter(jsonMessageConverter())
)
.channel("inbound")
.get();
}
#Bean
public IntegrationFlow httpOutboundGateway()
{
return IntegrationFlows.from("inbound").handle(Http.outboundGateway(urlExpression)).get();
}
The error I am now getting when I navigate to http://localhost:9000/tunnel is the following:
org.springframework.beans.factory.BeanNotOfRequiredTypeException: Bean named 'httpInboundGateway' is expected to be of type 'org.springframework.web.HttpRequestHandler' but was actually of type 'org.springframework.integration.dsl.StandardIntegrationFlow'
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:378) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202) ~[spring-beans-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1087) ~[spring-context-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at org.springframework.web.context.support.HttpRequestHandlerServlet.init(HttpRequestHandlerServlet.java:57) ~[spring-web-4.3.6.RELEASE.jar:4.3.6.RELEASE]
at javax.servlet.GenericServlet.init(GenericServlet.java:158) ~[tomcat-embed-core-8.5.11.jar:8.5.11]
at org.apache.catalina.core.StandardWrapper.initServlet(StandardWrapper.java:1183) ~[tomcat-embed-core-8.5.11.jar:8.5.11]
at
}

Answer 1

.handle(Http.inboundGateway("/tunnel"))
You can't invoke an inbound gateway from a .handle() method.
Inbound endpoints are not consumers.
It looks like it should be .from(Http.in...).
You have the same issue with the amqp inbound endpoint.