Hi,
I have the following route in my application which sends an email
based on a template filled out with data from the SingleImageModel
class:
from(ACTIVEMQ_EMAIL_QUEUE)
.routeId(ROUTE_EMAIL_NOTIFICATIONS)
.convertBodyTo(SingleImageModel.class)
// set subject, from address & to address
.setHeader("subject", constant(EMAIL_SUBJECT))
.setHeader("to", simple("${body.email}"))
.setHeader("from", constant(EMAIL_FROM))
// format the message body
.to(VELOCITY_EMAIL)
.log("${body}")
// send email
.to(SMTP_URL)
.end();
When it tries to execute the SMTP step the message fails with the
following error:
2017-12-21 17:30:08,034 []
org.apache.camel.processor.DefaultErrorHandler ERROR - Failed delivery
for (MessageId: ID-iusa16025-local-1513877322283-0-13 on ExchangeId:
ID-iusa16025-local-1513877322283-0-11). Exhausted after delivery
attempt: 1 caught: org.apache.camel.TypeConversionException: Error
during type conversion from type: java.lang.String to the required
type: java.lang.String with value queue://emailQueue due
com.fasterxml.jackson.databind.JsonMappingException: No serializer
found for class java.util.Vector$1 and no properties discovered to
create BeanSerializer (to avoid exception, disable
SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain:
org.apache.activemq.command.ActiveMQQueue["reference"]->javax.naming.Reference["all"])
The stacktrace is:
org.apache.camel.TypeConversionException: Error during type conversion
from type: java.lang.String to the required type: java.lang.String
with value queue://emailQueue due
com.fasterxml.jackson.databind.JsonMappingException: No serializer
found for class java.util.Vector$1 and no properties discovered to
create BeanSerializer (to avoid exception, disable
SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain:
org.apache.activemq.command.ActiveMQQueue["reference"]->javax.naming.Reference["all"])
at
org.apache.camel.impl.converter.BaseTypeConverterRegistry.createTypeConversionException(BaseTypeConverterRegistry.java:667)
at
org.apache.camel.impl.converter.BaseTypeConverterRegistry.convertTo(BaseTypeConverterRegistry.java:158)
at org.apache.camel.component.mail.MailBinding.asString(MailBinding.java:717)
at
org.apache.camel.component.mail.MailBinding.appendHeadersFromCamelMessage(MailBinding.java:398)
at
org.apache.camel.component.mail.MailBinding.populateMailMessage(MailBinding.java:117)
at org.apache.camel.component.mail.MailProducer.process(MailProducer.java:58)
at
org.apache.camel.util.AsyncProcessorConverterHelper$ProcessorToAsyncProcessorBridge.process(AsyncProcessorConverterHelper.java:61)
at
org.apache.camel.processor.SendProcessor$2.doInAsyncProducer(SendProcessor.java:178)
at org.apache.camel.impl.ProducerCache.doInAsyncProducer(ProducerCache.java:445)
at org.apache.camel.processor.SendProcessor.process(SendProcessor.java:173)
at
org.apache.camel.processor.interceptor.TraceInterceptor.process(TraceInterceptor.java:181)
at
org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:548)
at
org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:201)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:138)
at org.apache.camel.processor.Pipeline.process(Pipeline.java:101)
at
org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:201)
at
org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:97)
at
org.apache.camel.component.jms.EndpointMessageListener.onMessage(EndpointMessageListener.java:112)
at
org.springframework.jms.listener.AbstractMessageListenerContainer.doInvokeListener(AbstractMessageListenerContainer.java:719)
at
org.springframework.jms.listener.AbstractMessageListenerContainer.invokeListener(AbstractMessageListenerContainer.java:679)
at
org.springframework.jms.listener.AbstractMessageListenerContainer.doExecuteListener(AbstractMessageListenerContainer.java:649)
at
org.springframework.jms.listener.AbstractPollingMessageListenerContainer.doReceiveAndExecute(AbstractPollingMessageListenerContainer.java:317)
at
org.springframework.jms.listener.AbstractPollingMessageListenerContainer.receiveAndExecute(AbstractPollingMessageListenerContainer.java:255)
at
org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.invokeListener(DefaultMessageListenerContainer.java:1166)
at
org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.executeOngoingLoop(DefaultMessageListenerContainer.java:1158)
at
org.springframework.jms.listener.DefaultMessageListenerContainer$AsyncMessageListenerInvoker.run(DefaultMessageListenerContainer.java:1055)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
The root cause appears to be this:
Caused by: com.fasterxml.jackson.databind.JsonMappingException: No
serializer found for class java.util.Vector$1 and no properties
discovered to create BeanSerializer (to avoid exception, disable
SerializationFeature.FAIL_ON_EMPTY_BEANS) (through reference chain:
org.apache.activemq.command.ActiveMQQueue["reference"]->javax.naming.Reference["all"])
at
com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:284)
at
com.fasterxml.jackson.databind.SerializerProvider.mappingException(SerializerProvider.java:1110)
at
com.fasterxml.jackson.databind.SerializerProvider.reportMappingProblem(SerializerProvider.java:1135)
at
com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.failForEmpty(UnknownSerializer.java:69)
at
com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.serialize(UnknownSerializer.java:32)
at
com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:704)
>From searching around I can see that it is possible to configure
Jackson's ability to see properties with no accessor methods (using
objectMapper.setVisibility(PropertyAccessor.FIELD, Visibility.ANY); as
explained here: http://www.baeldung.com/jackson-jsonmappingexception),
but how can I do that in my Camel configuration?
Is that the right approach, or is there another way to solve this problem?
Thanks,
Charles.
