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JAXB 解组 - 读取器不能为空

竺勇
2023-03-14

我想从JMS中检索一些数据,过滤它们并发送到REST服务器。当我解组这些数据时,我得到一个错误:

java.lang.IllegalArgumentException:读取器不能为空
位于com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshalleImpl.unmarshall0(UnmarshallerImpl.java:370)位于com.sun.xml.bind.v2.runtime.ummarshaller.unmarsharlerImpl.unmashall(Unmarhallerimpl.java:356)位于org.apache.acamel.convertor.jaxb.JaxbDataFormat.unmarsshall(JaxbDataFormat.java:300)org.apache.camel.processer.errorhandler.RedeliveryErrorHandler$SimpleTask.run(RedeliveryError Handler.java:471)位于org.apache.camal.impl.engineer.DefaultReactiveExecutor$Worker.schedule(DefaultReactiveExecutior.java:193(DefaultReactiveExecutor.java:64)位于org.apache.acamel.processer.Pipeline.process(Pipeline.java:184),位于org.apache.cacamel.impl.engineer.CamelInternalProcessor.processe(CamelInternalProcesser.java:399),位于org.apache.cacamel.inmpl.engine.DefaultAsyncProcessorAwaitManager.process(DefaultAsyncProcesserAwaitManager.java:83)(AsyncProcessorSupport.java:41),位于org.apache.acamel.component.jms.EndpointMessageListener.onMessage(EndpointMessageListener.java:132),位于org.springframework.jms.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:736),位于org.springframework.jms.listener.AbstractMessageListenerContainer.doExecuteListener(AbstractMessage ListenerContiner.java:674),位于org.springfframework.jms.listener.AbtractPollingMessageListenerCContainer.doReceiveAndExecute(Abstract PollingMessageListerContainr.java:318)(AbstractPollingMessageListenerContainer.java:257)位于org.springframework.jms.listener.DefaultMessageListenerCContainer$AsyncMessageListenerInvoker.invokeListener(DefaultMessageListenerCainer.java:1237)位于org.spring framework.jms.listener.DDefaultMessageListenerContainer$Async MessageListenerinvoker.executeOngoingLoop(DefaultMessageLister.java:1227)org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.run(DefaultMessageListenerContainer.java:1120)位于java.base/java.util.concurrent.ThreadPoolExecutior.runWorker(ThreadPoolExecutior.java:1128)位于java.basi/java.util/concurrent.TthreadPoolExecutitor$Worker.run(ThreadPoolExecutor.java:628)位于java.base/java.lang.Thread.run(Thread.java:829)14:46:44.399[骆驼(camel-1)线程#1-JmsConsumer[MATERIALS_ENRICHED]]调试org.apache.camel.processor。管道-消息交换失败:因此断开管道进行交换:exchange[3917DB1BA45A384-00000000013]异常:java.lang.IllegalArgumentException:reader不能为null
14:46:44.399[Camel(Camel-1)thread#1-JmsConsumer[MATERIALS_ENRICHED]]WARN org.apache.Camel.component.jms。EndpointMessageListener-执行JMS消息侦听器失败。原因:[org.apache.camel.RuntimeCamelException-java.lang.IllegalArgumentException:reader不能为空]

我发现在JaxbDataFormat类的unmarshalhtml" target="_blank">方法中创建了空的读取器:

public Object unmarshal(Exchange exchange, InputStream stream) throws IOException {
        try {
            XMLStreamReader xmlReader;
            if (this.needFiltering(exchange)) {
                xmlReader = (XMLStreamReader)this.typeConverter.convertTo(XMLStreamReader.class, exchange, this.createNonXmlFilterReader(exchange, stream));
            } else {
                xmlReader = (XMLStreamReader)this.typeConverter.convertTo(XMLStreamReader.class, exchange, stream);
            }
            ...
        }
}

我怀疑我错过了pom.xml文件中的一些东西:

<?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/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.release11</groupId>
    <artifactId>toRest</artifactId>
    <version>1.0-SNAPSHOT</version>
    <packaging>jar</packaging>

    <properties>
        <maven.compiler.source>11</maven.compiler.source>
        <maven.compiler.target>11</maven.compiler.target>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-core</artifactId>
            <version>3.16.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-jackson</artifactId>
            <version>3.16.0</version>
        </dependency>

        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-jdbc</artifactId>
            <version>3.16.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-jsonpath</artifactId>
            <version>3.16.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.commons</groupId>
            <artifactId>commons-dbcp2</artifactId>
            <version>2.8.0</version>
        </dependency>
        <dependency>
            <groupId>mysql</groupId>
            <artifactId>mysql-connector-java</artifactId>
            <version>8.0.28</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-api</artifactId>
            <version>2.17.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.logging.log4j</groupId>
            <artifactId>log4j-core</artifactId >
            <version>2.17.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.activemq</groupId>
            <artifactId>activemq-client</artifactId>
            <version>5.16.2</version>
        </dependency>
        <dependency>
            <groupId>org.apache.activemq</groupId>
            <artifactId>activemq-camel</artifactId>
            <version>5.16.4</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-jaxb</artifactId>
            <version>3.16.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-jaxb-starter</artifactId>
            <version>2.25.4</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-jms</artifactId>
            <version>3.15.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.activemq</groupId>
            <artifactId>activemq-broker</artifactId>
            <version>5.16.4</version>
        </dependency>
        <dependency>
            <groupId>javax.xml.bind</groupId>
            <artifactId>jaxb-api</artifactId>
            <version>2.3.1</version>
        </dependency>
        <dependency>
            <groupId>com.sun.xml.bind</groupId>
            <artifactId>jaxb-impl</artifactId>
            <version>2.3.1</version>
        </dependency>
        <dependency>
            <groupId>com.sun.xml.messaging.saaj</groupId>
            <artifactId>saaj-impl</artifactId>
            <version>1.5.1</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.jaxrs</groupId>
            <artifactId>jackson-jaxrs-xml-provider</artifactId>
            <version>2.13.2</version>
        </dependency>
        <dependency>
            <groupId>commons-validator</groupId>
            <artifactId>commons-validator</artifactId>
            <version>1.7</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-undertow</artifactId>
            <version>3.16.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-servlet</artifactId>
            <version>3.16.0</version>
        </dependency>
        <dependency>
            <groupId>javax.servlet</groupId>
            <artifactId>javax.servlet-api</artifactId>
            <version>3.1.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-servlet-starter</artifactId>
            <version>3.0.0-RC3</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-jackson-starter</artifactId>
            <version>3.0.0-RC3</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-openapi-java</artifactId>
            <version>3.16.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-undertow</artifactId>
            <version>3.16.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-support</artifactId>
            <version>3.16.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-log</artifactId>
            <version>3.16.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-netty-http</artifactId>
            <version>3.16.0</version>
        </dependency>
        <dependency>
            <groupId>org.apache.camel</groupId>
            <artifactId>camel-http</artifactId>
            <version>3.16.0</version>
            <scope>test</scope>
        </dependency>
    </dependencies>
    <build>
        <resources>
            <resource>
                <directory>${project.basedir}/src/main/resources</directory>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-assembly-plugin</artifactId>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>single</goal>
                        </goals>
                        <configuration>
                            <archive>
                                <manifest>
                                    <mainClass>
                                        com.release11.OutputAdapter
                                    </mainClass>
                                </manifest>
                            </archive>
                            <descriptorRefs>
                                <descriptorRef>jar-with-dependencies</descriptorRef>
                            </descriptorRefs>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
        </plugins>
    </build>
</project>

这是我的集成代码:

public static void main(String[] args) throws Exception {
        PropertiesReader properties = new PropertiesReader("properties.properties");

        ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://" + properties.getProperty("activemq-host"));
        Connection connection = connectionFactory.createConnection();
        connection.start();
        CamelContext context = new DefaultCamelContext();
        context.addComponent("activemq", JmsComponent.jmsComponentAutoAcknowledge(connectionFactory));

        context.addRoutes(new RouteBuilder() {
            @Override
            public void configure() throws Exception {
                JAXBContext jaxbContext = JAXBContext.newInstance(ObjectFactory.class);
                JaxbDataFormat xmlDataFormat = new JaxbDataFormat(jaxbContext);

                restConfiguration()
                        .component("undertow")
                        .host(properties.getProperty("rest-host"))
                        .port(properties.getProperty("rest-port"))
                        .bindingMode(RestBindingMode.auto);

                from("activemq:topic:MATERIALS_ENRICHED?clientId=420&durableSubscriptionName=foo2")
                        .unmarshal(xmlDataFormat)
                        .filter(simple("${body.type} in 'A1,A2,A3'"))
                        .bean(JsonMapper.class, "process")
                        .delay(20000)
                        .process(exchange -> exchange.getIn().setHeader(Exchange.CONTENT_TYPE, constant("application/json")))
                        .to("rest:post:materials");
            }
        });
        context.start();
    }

你能给我一个提示吗?我不知道该尝试什么。请帮帮我。

编辑:在intellij中,这很好,当我在JAR中打包集成时,问题出现了。

共有1个答案

巫懿轩
2023-03-14

好的,我知道了。我正在运行胖罐子,当我创建一个薄罐子然后运行它时,它起作用了。

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