将Camel-Restlet端点部署到Tomcat中

Question

我需要将Camel Restlet端点部署到Tomcat中并从那里运行它。Apache Camel发行版(camel- example -restlet-jdbc)中提供的示例在部署到Tomcat中时不起作用。你知道我们该怎么纠正这个问题吗？我使用的是Camel 2.11.1和camel-restlet 2.7.1。这是我的POM：

<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/maven-v4_0_0.xsd">

  <groupId>com.walmart.asda</groupId>
  <artifactId>Camel_Servlet_Web</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>

    <modelVersion>4.0.0</modelVersion>

    <repositories>
        <repository>
        <id>maven-restlet</id>
        <name>Public online Restlet repository</name>
        <url>http://maven.restlet.org</url>
        </repository>
    </repositories>

    <dependencies>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-core</artifactId>
            <version>2.11.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-spring</artifactId>
            <version>2.11.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-jdbc</artifactId>
            <version>2.11.1</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>3.2.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>3.2.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>3.2.8.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-restlet</artifactId>
            <version>2.7.1</version>
        </dependency>
        <dependency>
            <groupId>org.restlet.jee</groupId>
            <artifactId>org.restlet.ext.spring</artifactId>
            <version>2.2.1</version>
            <exclusions>
                 <exclusion>
                 <groupId>org.springframework</groupId>
                 <artifactId>spring-asm</artifactId>
            </exclusion>
     </exclusions>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.5</version>
        </dependency>
    </dependencies>

    <build>
        <finalName>Restlet</finalName>
    </build>
</project>

下面是web.xml：

<web-app version="2.4" xmlns="http://java.sun.com/xml/ns/j2ee"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

    <display-name>An example showing how to create REST API with Camel Restlet and JDBC components</display-name>

    <context-param>
        <param-name>contextConfigLocation</param-name>
        <param-value>classpath:camel-context.xml</param-value>
    </context-param>

    <servlet>
        <servlet-name>RestletServlet</servlet-name>
        <servlet-class>org.restlet.ext.spring.SpringServerServlet</servlet-class>
        <init-param>
            <param-name>org.restlet.component</param-name>
            <param-value>RestletComponent</param-value>
        </init-param>
    </servlet>
    <servlet-mapping>
        <servlet-name>RestletServlet</servlet-name>
        <url-pattern>/rs/*</url-pattern>
    </servlet-mapping>

</web-app>

下面是camel-context.xml文件：

<beans xmlns="http://www.springframework.org/schema/beans"
       xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
       xmlns:camel="http://camel.apache.org/schema/spring"
       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="java-dsl.xml" /> -->

    <camel:camelContext xmlns="http://camel.apache.org/schema/spring">
        <route>
            <from uri="restlet:/users/{userId}?restletMethods=GET" />
            <transform>
                <simple>Hello ${header.userId} how are you?</simple>
            </transform>
        </route>
    </camel:camelContext>

    <bean id="RestletComponent" class="org.restlet.Component" />

    <bean id="RestletComponentService" class="org.apache.camel.component.restlet.RestletComponent">
        <constructor-arg index="0">
            <ref bean="RestletComponent" />
        </constructor-arg>
    </bean>   

</beans>

当我将这个应用程序打包并部署到Tomcat7.0.53中，并点击下面的URL http://localhost:8081/Restlet/rs/users/123时，我得到了一个异常：

org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040) org的servlet javax.servlet.ServletException: Servlet.init()抛出异常RestletServlet。apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607) org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2441) org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2430) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) java.lang.Thread.run(Thread.java:745)根本原因

java.lang.IllegalStateException:未找到WebApplicationContext :未注册ContextLoaderListener？org.springframework.web.context.support.WebApplicationContextUtils.getRequiredWebApplicationContext(WebApplicationContextUtils.java:84) org.restlet.ext.spring.SpringServerServlet.getWebApplicationContext(SpringServerServlet.java:140) org.restlet.ext.spring.SpringServerServlet.createComponent(SpringServerServlet.java:116) org.restlet.ext.servlet.ServerServlet.getComponent(ServerServlet.java:843) org.restlet.ext.servlet.ServerServlet.init(ServerServlet.java:961) javax.servlet.GenericServlet.init(GenericServlet.java:158) org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:501) org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98) org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950) org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408) org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1040) org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:607) org.apache。tomcat.util.net.AprEndpoint$SocketProcessor.doRun(AprEndpoint.java:2441) org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:2430) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) java.lang.Thread.run(Thread.java:745)

Answer 1

当您使用camel-restlet时，您应该选择相同版本的camel-core。请将camel-restlet版本更改为2.11.1。

Answer 2

得到了解决方案-这是dependency...tried a dependency:tree的问题，并发现camel-restlet2.11.1使用org.restlet.jse:org.restlet:jar:2.0.15。因此，org.restlet.jee:org.restlet.ext.spring:jar的版本也应该是2.0.15 -我使用的是版本2.2.1。一旦我更改了版本并部署到Tomcat中，它就可以正常工作了。以下是可以工作的更新后的POM：

<?xml version="1.0" encoding="UTF-8"?>
<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/maven-v4_0_0.xsd">

  <groupId>com.walmart.asda</groupId>
  <artifactId>Camel_Servlet_Web</artifactId>
  <packaging>war</packaging>
  <version>0.0.1-SNAPSHOT</version>

    <modelVersion>4.0.0</modelVersion>

    <repositories>
        <repository>
        <id>maven-restlet</id>
        <name>Public online Restlet repository</name>
        <url>http://maven.restlet.org</url>
        </repository>
    </repositories>

    <dependencies>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-core</artifactId>
            <version>2.11.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-spring</artifactId>
            <version>2.11.1</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-jdbc</artifactId>
            <version>2.11.1</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-web</artifactId>
            <version>3.1.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jdbc</artifactId>
            <version>3.1.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-expression</artifactId>
            <version>3.1.4.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-restlet</artifactId>
            <version>2.11.1</version>
        </dependency>
        <dependency>
            <groupId>org.restlet.jee</groupId>
            <artifactId>org.restlet.ext.spring</artifactId>
            <version>2.0.15</version>
            <exclusions>
                 <exclusion>
                 <groupId>org.springframework</groupId>
                 <artifactId>spring-asm</artifactId>
            </exclusion>
     </exclusions>
        </dependency>
        <dependency>
            <groupId>org.slf4j</groupId>
            <artifactId>slf4j-log4j12</artifactId>
            <version>1.7.5</version>
        </dependency>
    </dependencies>

    <build>
        <finalName>Restlet</finalName>
    </build>
</project>