gateway-0.0.1-SNAPSHOT.jar can't run

[xiongqisong]

I clone spring-cloud-gateway-bench repository, and package gateway runnable jar, but when i run it, i got this:
java.lang.IllegalStateException: Failed to introspect Class [org.springframework.cloud.gateway.config.GatewayAutoConfiguration$NettyConfiguration] from ClassLoader [org.springframework.boot.loader.LaunchedURLClassLoader@20ad9418]
at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:686) ~[spring-core-5.1.4.RELEASE.jar!/:5.1.4.RELEASE]
at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:583) ~[spring-core-5.1.4.RELEASE.jar!/:5.1.4.RELEASE]
at org.springframework.util.ReflectionUtils.doWithMethods(ReflectionUtils.java:568) ~[spring-core-5.1.4.RELEASE.jar!/:5.1.4.RELEASE]
at org.springframework.util.ReflectionUtils.getUniqueDeclaredMethods(ReflectionUtils.java:626) ~[spring-core-5.1.4.RELEASE.jar!/:5.1.4.RELEASE]
at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1688) ~[na:1.8.0_192]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.getTypeForFactoryMethod(AbstractAutowireCapableBeanFactory.java:721) ~[spring-beans-5.1.4.RELEASE.jar!/:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.determineTargetType(AbstractAutowireCapableBeanFactory.java:662) ~[spring-beans-5.1.4.RELEASE.jar!/:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:630) ~[spring-beans-5.1.4.RELEASE.jar!/:5.1.4.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1518) ~[spring-beans-5.1.4.RELEASE.jar!/:5.1.4.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doGetBeanNamesForType(DefaultListableBeanFactory.java:507) ~[spring-beans-5.1.4.RELEASE.jar!/:5.1.4.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanNamesForType(DefaultListableBeanFactory.java:477) ~[spring-beans-5.1.4.RELEASE.jar!/:5.1.4.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:598) ~[spring-beans-5.1.4.RELEASE.jar!/:5.1.4.RELEASE]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeansOfType(DefaultListableBeanFactory.java:590) ~[spring-beans-5.1.4.RELEASE.jar!/:5.1.4.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.getBeansOfType(AbstractApplicationContext.java:1204) ~[spring-context-5.1.4.RELEASE.jar!/:5.1.4.RELEASE]
at org.springframework.boot.SpringApplication.getExitCodeFromMappedException(SpringApplication.java:905) [spring-boot-2.1.2.RELEASE.jar!/:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.getExitCodeFromException(SpringApplication.java:891) [spring-boot-2.1.2.RELEASE.jar!/:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.handleExitCode(SpringApplication.java:877) [spring-boot-2.1.2.RELEASE.jar!/:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.handleRunFailure(SpringApplication.java:826) [spring-boot-2.1.2.RELEASE.jar!/:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:327) [spring-boot-2.1.2.RELEASE.jar!/:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1260) [spring-boot-2.1.2.RELEASE.jar!/:2.1.2.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1248) [spring-boot-2.1.2.RELEASE.jar!/:2.1.2.RELEASE]
at com.example.gateway.GatewayApplication.main(GatewayApplication.java:21) [classes!/:0.0.1-SNAPSHOT]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_192]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_192]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_192]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_192]
at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48) [gateway-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
at org.springframework.boot.loader.Launcher.launch(Launcher.java:87) [gateway-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
at org.springframework.boot.loader.Launcher.launch(Launcher.java:50) [gateway-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:51) [gateway-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
Caused by: java.lang.NoClassDefFoundError: reactor/netty/http/client/HttpResponseDecoderSpec
at java.lang.Class.getDeclaredMethods0(Native Method) ~[na:1.8.0_192]
at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) ~[na:1.8.0_192]
at java.lang.Class.getDeclaredMethods(Class.java:1975) ~[na:1.8.0_192]
at org.springframework.util.ReflectionUtils.getDeclaredMethods(ReflectionUtils.java:668) ~[spring-core-5.1.4.RELEASE.jar!/:5.1.4.RELEASE]
... 29 common frames omitted
Caused by: java.lang.ClassNotFoundException: reactor.netty.http.client.HttpResponseDecoderSpec
at java.net.URLClassLoader.findClass(URLClassLoader.java:382) ~[na:1.8.0_192]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_192]
at org.springframework.boot.loader.LaunchedURLClassLoader.loadClass(LaunchedURLClassLoader.java:93) ~[gateway-0.0.1-SNAPSHOT.jar:0.0.1-SNAPSHOT]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_192]
... 33 common frames omitted

[tom-kwok]

It is a compatibility issue.
Spring 2.1.18 RELEASE + Spring cloud Greenwich.SR6 works for me, like this:

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.18.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
		<spring-cloud.version>Greenwich.SR6</spring-cloud.version>
	</properties>