'JAXB unmarshalling - reader cannot be null
I want to retrieve some data from JMS, filter them and send them to REST server. When I unmarshal those data I get an error:
java.lang.IllegalArgumentException: reader can not be null
at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal0(UnmarshallerImpl.java:370) at com.sun.xml.bind.v2.runtime.unmarshaller.UnmarshallerImpl.unmarshal(UnmarshallerImpl.java:356) at org.apache.camel.converter.jaxb.JaxbDataFormat.unmarshal(JaxbDataFormat.java:300) at org.apache.camel.support.processor.UnmarshalProcessor.process(UnmarshalProcessor.java:76) at org.apache.camel.processor.errorhandler.RedeliveryErrorHandler$SimpleTask.run(RedeliveryErrorHandler.java:471) at org.apache.camel.impl.engine.DefaultReactiveExecutor$Worker.schedule(DefaultReactiveExecutor.java:193) at org.apache.camel.impl.engine.DefaultReactiveExecutor.scheduleMain(DefaultReactiveExecutor.java:64) at org.apache.camel.processor.Pipeline.process(Pipeline.java:184) at org.apache.camel.impl.engine.CamelInternalProcessor.process(CamelInternalProcessor.java:399) at org.apache.camel.impl.engine.DefaultAsyncProcessorAwaitManager.process(DefaultAsyncProcessorAwaitManager.java:83) at org.apache.camel.support.AsyncProcessorSupport.process(AsyncProcessorSupport.java:41) at org.apache.camel.component.jms.EndpointMessageListener.onMessage(EndpointMessageListener.java:132) at org.springframework.jms.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:736) at org.springframework.jms.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:696) at org.springframework.jms.listener.AbstractMessageListenerContainer.doExecuteListener(AbstractMessageListenerContainer.java:674) at org.springframework.jms.listener.AbstractPollingMessageListenerContainer.doReceiveAndExecute(AbstractPollingMessageListenerContainer.java:318) at org.springframework.jms.listener.AbstractPollingMessageListenerContainer.receiveAndExecute(AbstractPollingMessageListenerContainer.java:257) at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.invokeListener(DefaultMessageListenerContainer.java:1237) at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.executeOngoingLoop(DefaultMessageListenerContainer.java:1227) at org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.run(DefaultMessageListenerContainer.java:1120) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.lang.Thread.run(Thread.java:829) 14:46:44.399 [Camel (camel-1) thread #1 - JmsConsumer[MATERIALS_ENRICHED]] DEBUG org.apache.camel.processor.Pipeline - Message exchange has failed: so breaking out of pipeline for exchange: Exchange[3917DB1BA45A384-0000000000000013] Exception: java.lang.IllegalArgumentException: reader can not be null
14:46:44.399 [Camel (camel-1) thread #1 - JmsConsumer[MATERIALS_ENRICHED]] WARN org.apache.camel.component.jms.EndpointMessageListener - Execution of JMS message listener failed. Caused by: [org.apache.camel.RuntimeCamelException - java.lang.IllegalArgumentException: reader can not be null ]
I found out the reader which is null is created in unmarshal method in JaxbDataFormat class:
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);
}
...
}
}
I suspect I miss something in my pom.xml file:
<?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>${project.basedir}/src/main/resources</directory>
</resource>
</resources>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-assembly-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
<configuration>
<archive>
<manifest>
<mainClass>
com.release11.OutputAdapter
</mainClass>
</manifest>
</archive>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
And here's my code of the integration:
public static void main(String[] args) throws Exception {
PropertiesReader properties = new PropertiesReader("properties.properties");
ActiveMQConnectionFactory connectionFactory = new ActiveMQConnectionFactory("tcp://" + properties.getProperty("activemq-host"));
Connection connection = connectionFactory.createConnection();
connection.start();
CamelContext context = new DefaultCamelContext();
context.addComponent("activemq", JmsComponent.jmsComponentAutoAcknowledge(connectionFactory));
context.addRoutes(new RouteBuilder() {
@Override
public void configure() throws Exception {
JAXBContext jaxbContext = JAXBContext.newInstance(ObjectFactory.class);
JaxbDataFormat xmlDataFormat = new JaxbDataFormat(jaxbContext);
restConfiguration()
.component("undertow")
.host(properties.getProperty("rest-host"))
.port(properties.getProperty("rest-port"))
.bindingMode(RestBindingMode.auto);
from("activemq:topic:MATERIALS_ENRICHED?clientId=420&durableSubscriptionName=foo2")
.unmarshal(xmlDataFormat)
.filter(simple("${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();
}
Can you please give me a hint what is wrong? I'm running out of ideas what to try. Please help me.
EDIT: In intellij this works just fine, the problem appears when I pack the integration in JAR.
Solution 1:[1]
Okay, I've got it. I was running fat jar, when I had created a thin jar and then ran it it worked.
Sources
This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.
Source: Stack Overflow
| Solution | Source |
|---|---|
| Solution 1 | Hellmick |