【发布时间】:2020-07-13 09:41:52
【问题描述】:
我对使用 Apache Camel 还是很陌生,我正在尝试修改某人 (https://www.javainuse.com/camel/camel-consume-rest) 提供的示例,以基本上做与原始应用程序相同的事情,除了将 Spring Boot 和 Camel 与 XML 结合使用路由配置。
我下载了原始应用程序代码(Camel 消费者和 HTTP 服务器)并让它们非常容易地正常运行和执行。
现在,我想稍微修改一下应用程序,以便使用 Spring Boot 进行所有幕后配置,并使用 XML DSL 配置 Camel 路由。原始的 Camel 消费者应用程序根本不使用 Spring。
我做出了看似有意义的更改,但无法让应用程序运行。我得到以下异常:
Exception in thread "main" java.lang.IllegalAccessError: tried to access method org.springframework.core.io.support.SpringFactoriesLoader.loadFactoryNames(Ljava/lang/Class;Ljava/lang/ClassLoader;)Ljava/util/List; from class org.springframework.boot.SpringApplication
at org.springframework.boot.SpringApplication.getSpringFactoriesInstances(SpringApplication.java:418)
at org.springframework.boot.SpringApplication.getSpringFactoriesInstances(SpringApplication.java:412)
at org.springframework.boot.SpringApplication.<init>(SpringApplication.java:268)
at org.springframework.boot.SpringApplication.<init>(SpringApplication.java:249)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1213)
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1202)
at org.test.ApplicationMain.main(ApplicationMain.java:12)
我不明白它在抱怨什么。我在下面包含资源,以便人们可以查看我在做什么。对于代码量,我提前道歉。
ApplicationMain.java:
@SpringBootApplication
@ImportResource("classpath:camel-context.xml")
public class ApplicationMain {
public static void main(String[] args) {
SpringApplication.run(ApplicationMain.class, args);
}
}
Configurer.java:
@Configuration
@ComponentScan("org.test")
public class Configurer {
@Bean
public MyProcessor myProcessor() {
return new MyProcessor();
}
}
application.yml:
---
camel:
springboot:
name: CamelConsumer
main-run-controller: true
骆驼上下文.xml:
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd">
<import resource="classpath:routes/routes.xml" />
<camelContext id="camel-context" xmlns="http://camel.apache.org/schema/spring">
<routeContextRef ref="routes" />
</camelContext>
</beans>
路由/路由.xml:
注意:我不知道我是否对以下路由定义中的元素使用了正确的语法。我正在尝试将其改编自原始版本,该原始版本是在 Java DSL 中完成的。我也不确定是否需要处理器 bean 定义,因为我在上面的配置器中也定义了 bean。
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="
http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
http://camel.apache.org/schema/spring http://camel.apache.org/schema/spring/camel-spring.xsd">
<bean id="myProcessor" class="org.test.processor.MyProcessor" />
<routeContext id="routes" xmlns="http://camel.apache.org/schema/spring">
<route id="httpTest">
<from uri="file:C:/inboxREST?noop=true" />
<setHeader headerName="HTTP_METHOD">
<simple>GET</simple>
</setHeader>
<to uri="http://localhost:8080/employee?id=5" />
<process ref="myProcessor" />
</route>
</routeContext>
</beans>
MyProcessor.java:
public class MyProcessor implements Processor {
public MyProcessor() {
}
public void process(Exchange exchange) throws Exception {
System.out.println(exchange.getIn().getBody(String.class));
}
}
pom.xml:
注意:您可能会注意到 Spring Boot Camel 启动器以及 Camel 组件的 Camel 依赖项(如 HTTP)的混合。我不清楚我真正需要哪些。 Spring Boot 启动器是否不再需要包含 Camel 组件依赖项?
<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>
<groupId>com.javainuse</groupId>
<artifactId>apache-camel-consume</artifactId>
<version>0.0.1-SNAPSHOT</version>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.6.RELEASE</version>
<relativePath />
</parent>
<properties>
<java.version>1.8</java.version>
<apache-camel-springboot.version>3.1.0</apache-camel-springboot.version>
<apache-camel.version>3.1.0</apache-camel.version>
</properties>
<dependencies>
<!-- Camel BOM -->
<dependency>
<groupId>org.apache.camel.springboot</groupId>
<artifactId>camel-spring-boot-dependencies</artifactId>
<version>${apache-camel-springboot.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
<!-- Camel Starter -->
<dependency>
<groupId>org.apache.camel.springboot</groupId>
<artifactId>camel-spring-boot-starter</artifactId>
<version>${apache-camel-springboot.version}</version>
</dependency>
<dependency>
<groupId>org.apache.camel.springboot</groupId>
<artifactId>camel-spring-boot</artifactId>
<version>${apache-camel-springboot.version}</version>
</dependency>
<!-- Camel HTTP -->
<dependency>
<groupId>org.apache.camel</groupId>
<artifactId>camel-http</artifactId>
<version>${apache-camel.version}</version>
</dependency>
<dependency>
<groupId>org.apache.camel.springboot</groupId>
<artifactId>camel-http-starter</artifactId>
<version>${apache-camel-springboot.version}</version>
</dependency>
<!-- Camel Jackson -->
<dependency>
<groupId>org.apache.camel.springboot</groupId>
<artifactId>camel-jackson-starter</artifactId>
<version>${apache-camel-springboot.version}</version>
</dependency>
<!-- Spring Boot -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
<exclusions>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
</exclusion>
<exclusion>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-logging</artifactId>
</exclusion>
</exclusions>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.1</version>
</plugin>
<plugin>
<groupId>org.apache.felix</groupId>
<artifactId>maven-bundle-plugin</artifactId>
<extensions>true</extensions>
<version>2.4.0</version>
</plugin>
</plugins>
</build>
</project>
【问题讨论】:
-
也许从一个使用您想要使用的确切框架的示例开始会更有成效?见github.com/apache/camel-spring-boot/tree/master/examples
-
这就是我在开头包含链接的原因。此外,SO 可能没有足够的空间来包含所有这些信息。
标签: java spring-boot apache-camel