Spring integration Kotlin Java DSL：从字节[]转换为字符串

我正在将Spring集成的

tcp客户机服务器
示例转换为使用JavaDSL和Kotlin

在我的入站TCP服务器中，我需要将来自通道的
字节[]
转换为我的echo服务的
字符串

这是我当前的流定义：

@EnableIntegration
@IntegrationComponentScan
@Configuration
class ClientServerDemoConfig {

@MessagingGateway(defaultRequestChannel = "input", name = "gw")
interface SimpleGateway {
    fun send(text: String): String
}

@Bean
fun outboundTCP() =
    IntegrationFlows.from("input")
        .handle(Tcp.outboundGateway(TcpNetClientConnectionFactory("127.0.0.1", 7777)))
        .get()

@Bean
fun inboundTCP() =
    IntegrationFlows.from(Tcp.inboundGateway(TcpNetServerConnectionFactory(7777)))
        .transform<Array<Byte>, String> { p -> String(p.toByteArray()) }
        .handle(EchoService(), "test")
        .get()

奇怪的是，在调试时，我可以看到正在执行的转换器，但随后我陷入了试图找出它为什么不工作的细节中

有人能告诉我我没有做什么或做错了什么吗

谢谢

dependencies {
    compile('org.springframework.boot:spring-boot-starter-integration')
    compile('org.springframework.integration:spring-integration-ip')
    compile("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
    compile("org.jetbrains.kotlin:kotlin-reflect")
    runtime('org.springframework.boot:spring-boot-devtools')
    testCompile('org.springframework.boot:spring-boot-starter-test')
}

堆栈跟踪：

2018-07-10 16:53:59.726 ERROR 20187 --- [  restartedMain] o.s.boot.SpringApplication               : Application run failed

java.lang.IllegalStateException: Failed to execute CommandLineRunner
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:800) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
    at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:781) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:335) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1255) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1243) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
    at alwyn.tcpclientserver.ClientServerDemoApplicationKt.main(ClientServerDemoApplication.kt:29) [main/:na]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_161]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_161]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_161]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_161]
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-2.0.3.RELEASE.jar:2.0.3.RELEASE]
Caused by: org.springframework.beans.ConversionNotSupportedException: Failed to convert value of type 'byte[]' to required type 'java.lang.String'; nested exception is java.lang.IllegalStateException: Cannot convert value of type 'byte[]' to required type 'java.lang.String': no matching editors or conversion strategy found
    at org.springframework.beans.TypeConverterSupport.doConvert(TypeConverterSupport.java:77) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.beans.TypeConverterSupport.convertIfNecessary(TypeConverterSupport.java:44) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.integration.gateway.GatewayProxyFactoryBean.convert(GatewayProxyFactoryBean.java:763) ~[spring-integration-core-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at org.springframework.integration.gateway.GatewayProxyFactoryBean.invokeGatewayMethod(GatewayProxyFactoryBean.java:532) ~[spring-integration-core-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at org.springframework.integration.gateway.GatewayProxyFactoryBean.doInvoke(GatewayProxyFactoryBean.java:469) ~[spring-integration-core-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at org.springframework.integration.gateway.GatewayProxyFactoryBean.invoke(GatewayProxyFactoryBean.java:460) ~[spring-integration-core-5.0.6.RELEASE.jar:5.0.6.RELEASE]
    at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:185) ~[spring-aop-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) ~[spring-aop-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at com.sun.proxy.$Proxy60.send(Unknown Source) ~[na:na]
    at alwyn.tcpclientserver.ClientServerDemoApplication.run(ClientServerDemoApplication.kt:19) ~[main/:na]
    at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:797) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
    ... 10 common frames omitted
Caused by: java.lang.IllegalStateException: Cannot convert value of type 'byte[]' to required type 'java.lang.String': no matching editors or conversion strategy found
    at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:299) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.beans.TypeConverterDelegate.convertIfNecessary(TypeConverterDelegate.java:99) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.beans.TypeConverterSupport.doConvert(TypeConverterSupport.java:73) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    ... 20 common frames omitted

TCP/IP实际上是一个
byte[]
协议，因此很自然地，这种类型将被发送到出站端，并从入站端接收

对于您的
fun发送（text:String）：String
gateway合同，在通过
Tcp.outboundGateway（）
收到回复后，您确实需要添加
byte[]->String
转换/转换。因此，要为您的客户解决此问题，您需要在客户端具有类似的功能：

@Bean
fun outboundTCP() =
    IntegrationFlows.from("input")
        .handle(Tcp.outboundGateway(TcpNetClientConnectionFactory("127.0.0.1", 7777)))
        .transform(Transformers.objectToString())
        .get()

我认为，
IllegalStateException
来自其他地方，而不是您的
.transform（）
。请与我们共享一个完整的堆栈跟踪，以便更好地了解整个情况。当我在启用spring boot调试的情况下运行时，它会检查条件，并出于某种原因抱怨FailureAnalyzer org.springframework.boot.autoconfigure.jdbc。HikariDriverConfigurationFailureAnalyzer@3b8f5ed失败，但是我在build.gradle.Well中没有提到spring数据、jdbc或任何与sql相关的内容。这绝对与
.transform（）
无关。请不要在一个问题中混入顾虑。让我们专注于报告的问题！好的，我将为转换和依赖项添加完整的堆栈跟踪。？？？不，我说的是一个异常堆栈跟踪。我不需要你的依赖。您只需要从日志中显示更多关于
IllegalStateException
@Bean
fun outboundTCP() =
    IntegrationFlows.from("input")
        .handle(Tcp.outboundGateway(TcpNetClientConnectionFactory("127.0.0.1", 7777)))
        .transform(Transformers.objectToString())
        .get()