Java 零指针异常Spring集成消息传递

我开始学习Spring集成…下面的代码产生了一个空指针异常

xml（Spring配置）

错误堆栈

Exception in thread "main" org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [resources/spring-context.xml]; nested exception is java.lang.NullPointerException
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:420)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:342)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:310)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:143)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:178)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:149)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:212)
    at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:113)
    at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:80)
    at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:123)
    at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:422)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:352)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
    at co.in.app.main(app.java:11)
Caused by: java.lang.NullPointerException
    at org.springframework.beans.factory.support.BeanDefinitionReaderUtils.generateBeanName(BeanDefinitionReaderUtils.java:115)
    at org.springframework.beans.factory.support.BeanDefinitionReaderUtils.generateBeanName(BeanDefinitionReaderUtils.java:159)
    at org.springframework.beans.factory.support.DefaultBeanNameGenerator.generateBeanName(DefaultBeanNameGenerator.java:31)
    at org.springframework.beans.factory.xml.XmlReaderContext.generateBeanName(XmlReaderContext.java:77)
    at org.springframework.beans.factory.xml.AbstractBeanDefinitionParser.resolveId(AbstractBeanDefinitionParser.java:102)
    at org.springframework.beans.factory.xml.AbstractBeanDefinitionParser.parse(AbstractBeanDefinitionParser.java:59)
    at org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(NamespaceHandlerSupport.java:69)
    at org.springframework.integration.config.xml.AbstractIntegrationNamespaceHandler.parse(AbstractIntegrationNamespaceHandler.java:57)
    at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1297)
    at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1287)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:135)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:92)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:507)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:398)
    ... 14 more

线程“main”org.springframework.beans.factory.BeanDefinitionStoreException中的异常：从类路径资源[resources/spring context.XML]解析XML文档时发生意外异常；嵌套异常为java.lang.NullPointerException
位于org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions（XmlBeanDefinitionReader.java:420）
位于org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions（XmlBeanDefinitionReader.java:342）
位于org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions（XmlBeanDefinitionReader.java:310）
位于org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions（AbstractBeanDefinitionReader.java:143）
位于org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions（AbstractBeanDefinitionReader.java:178）
位于org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions（AbstractBeanDefinitionReader.java:149）
位于org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions（AbstractBeanDefinitionReader.java:212）
位于org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions（AbstractXmlApplicationContext.java:113）
位于org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions（AbstractXmlApplicationContext.java:80）
位于org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory（AbstractRefreshableApplicationContext.java:123）
位于org.springframework.context.support.AbstractApplicationContext.GettainFreshBeanFactory（AbstractApplicationContext.java:422）
位于org.springframework.context.support.AbstractApplicationContext.refresh（AbstractApplicationContext.java:352）
位于org.springframework.context.support.ClassPathXmlApplicationContext。（ClassPathXmlApplicationContext.java:139）
位于org.springframework.context.support.ClassPathXmlApplicationContext。（ClassPathXmlApplicationContext.java:83）
位于co.in.app.main（app.java:11）
原因：java.lang.NullPointerException
位于org.springframework.beans.factory.support.BeanDefinitionReaderUtils.generatebeaname（BeanDefinitionReaderUtils.java:115）
位于org.springframework.beans.factory.support.BeanDefinitionReaderUtils.generatebeaname（BeanDefinitionReaderUtils.java:159）
位于org.springframework.beans.factory.support.DefaultBeanNameGenerator.GenerateBanName（DefaultBeanNameGenerator.java:31）
位于org.springframework.beans.factory.xml.XmlReaderContext.generateBeanName（XmlReaderContext.java:77）
位于org.springframework.beans.factory.xml.AbstractBeanDefinitionParser.resolveId（AbstractBeanDefinitionParser.java:102）
位于org.springframework.beans.factory.xml.AbstractBeanDefinitionParser.parse（AbstractBeanDefinitionParser.java:59）
位于org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse（NamespaceHandlerSupport.java:69）
位于org.springframework.integration.config.xml.AbstractIntegrationNamespaceHandler.parse（AbstractIntegrationNamespaceHandler.java:57）
位于org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement（BeanDefinitionParserDelegate.java:1297）
位于org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement（BeanDefinitionParserDelegate.java:1287）
位于org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions（DefaultBeanDefinitionDocumentReader.java:135）
位于org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions（DefaultBeanDefinitionDocumentReader.java:92）
位于org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions（XmlBeanDefinitionReader.java:507）
位于org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions（XmlBeanDefinitionReader.java:398）
…还有14个

根据堆栈跟踪，您似乎正在使用Spring Integration 2.0.x

您使用的是什么版本的Spring

---

我建议您使用当前版本（2.1.3.release）。

根据堆栈跟踪，您似乎正在使用Spring Integration 2.0.x

您使用的是什么版本的Spring

---

我建议您使用当前版本（2.1.3.release）。

我使用的是spring integration core 2.1.0.release我使用的是spring integration core 2.1.0.release

package co.in;

import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.integration.Message;
import org.springframework.integration.MessageChannel;
import org.springframework.integration.core.PollableChannel;
import org.springframework.integration.support.MessageBuilder;

public class app {
    public static void main(String[] args) {
        ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext(
                "classpath:resources/spring-context.xml");
        context.start();

        MessageChannel input = (MessageChannel) context.getBean("input",
                MessageChannel.class);
        PollableChannel output = (PollableChannel) context.getBean("output",
                PollableChannel.class);
        input.send(MessageBuilder.withPayload("Pro Spring Integration Example")
                .build());

        Message<?> reply = output.receive();
        System.out.println("received: " + reply);

    }
}

package co.in;

import org.springframework.integration.annotation.ServiceActivator;

@Component
public class MessageHandler {

    @ServiceActivator
    public String handleMessage(String message) {
        System.out.println("Received message: " + message);
        return "MESSAGE:" + message;
    }
} 

Exception in thread "main" org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [resources/spring-context.xml]; nested exception is java.lang.NullPointerException
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:420)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:342)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:310)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:143)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:178)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:149)
    at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:212)
    at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:113)
    at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:80)
    at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:123)
    at org.springframework.context.support.AbstractApplicationContext.obtainFreshBeanFactory(AbstractApplicationContext.java:422)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:352)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
    at co.in.app.main(app.java:11)
Caused by: java.lang.NullPointerException
    at org.springframework.beans.factory.support.BeanDefinitionReaderUtils.generateBeanName(BeanDefinitionReaderUtils.java:115)
    at org.springframework.beans.factory.support.BeanDefinitionReaderUtils.generateBeanName(BeanDefinitionReaderUtils.java:159)
    at org.springframework.beans.factory.support.DefaultBeanNameGenerator.generateBeanName(DefaultBeanNameGenerator.java:31)
    at org.springframework.beans.factory.xml.XmlReaderContext.generateBeanName(XmlReaderContext.java:77)
    at org.springframework.beans.factory.xml.AbstractBeanDefinitionParser.resolveId(AbstractBeanDefinitionParser.java:102)
    at org.springframework.beans.factory.xml.AbstractBeanDefinitionParser.parse(AbstractBeanDefinitionParser.java:59)
    at org.springframework.beans.factory.xml.NamespaceHandlerSupport.parse(NamespaceHandlerSupport.java:69)
    at org.springframework.integration.config.xml.AbstractIntegrationNamespaceHandler.parse(AbstractIntegrationNamespaceHandler.java:57)
    at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1297)
    at org.springframework.beans.factory.xml.BeanDefinitionParserDelegate.parseCustomElement(BeanDefinitionParserDelegate.java:1287)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.parseBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:135)
    at org.springframework.beans.factory.xml.DefaultBeanDefinitionDocumentReader.registerBeanDefinitions(DefaultBeanDefinitionDocumentReader.java:92)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.registerBeanDefinitions(XmlBeanDefinitionReader.java:507)
    at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.doLoadBeanDefinitions(XmlBeanDefinitionReader.java:398)
    ... 14 more