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Opentelemetry: How to add logs to a span

I am using OpenTelemetry java auto instrumentation in my spring boot app. Is there a way to make the application logs part of the spans that are created?
My autoconfig settings are as below:
-Dotel.traces.exporter=jaeger
-Dotel.metrics.exporter=none
-Dotel.exporter.jaeger.endpoint=http://localhost:14250
-Dotel.resource.attributes=service.name=myService
-javaagent:C:/path/to/opentelemetry-javaagent-1.0.1-all.jar

OpenTelemetry ships logs separately to the telemetry data obtained from auto instrumentation, and does not interleave log data I'm afraid. We ship our logs via the use of FluentBit (https://medium.com/opentelemetry/introducing-the-fluentbit-exporter-for-opentelemetry-574ec133b4b4).
You may wish to use manual instrumentation and add spans, span attributes and/or events to pertinent code blocks, to add log like context to the metadata utilised downstream.
As you are using Spring Boot, it would be advisable to use one of the starter dependencies, such as opentelemetry-otlp-exporter-starter (https://github.com/open-telemetry/opentelemetry-java-instrumentation/tree/main/instrumentation/spring/starters/otlp-exporter-starter), which should get you most of the way there. You want to use the #WithSpan annotation to decorate your methods, which will enable you to obtain the current span easily. See https://opentelemetry.lightstep.com/java/.
The official docs have a few examples, that may help, but be aware that the API and SDK are changing rapidly, so examples don't always work - https://opentelemetry.io/docs/java/manual_instrumentation/.
Detailed information regarding OpenTelemetry and logging: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/logs/overview.md

Adding logs to spans depends a bit on the backend you are using for collecting the traces/spans and visualizing them.
I used Jaegar, which interprets OTEL events as logs in the UI, and so I wrote a custom log appender which put app logs into an event, which was picked up subsequently in the UI.
More details here:
https://stackoverflow.com/a/68739794/2715083

How to update camel properties externally?

Im developping non OSGI app and i need to update the values ​​of some properties used in camel routes (loaded BridgePropertyPlaceHolder).
So I thought:
To use Hawtio, the cool mangement console, in order update camel using JMX
Create a JMX MBean that will update the properties ..
I successfully create the MBean operations and call them using JMX, but I can't figure out how to update the camel routes that depends on these properties.
Is there a way to update the camel context externally?
Update:
Exemple of use case:when a remote server doesn't return response, we keep sending messages until we reach the max of unsuccessful attempt(messages without ack).
in camel we create a router pattern based on property loaded from file system.
This property can change occasionally, and we want to do this without restarting server, but the problem is that camel parse routes when starting context and i can't find no mean to update routes accordingly.
I am grateful for any proposal that could help:)

If you use Camel error handling to retry (redeliver) then you can use the retryWhile to keep retrying until you return false. This allows you to use java code etc, and that allows you to read the updated configuration option.
See more details at
http://camel.apache.org/exception-clause.html
And if you have a copy of Camel in Action book, see page 152

For what properties you want them to be dynamic.you can move those prop to some db and fetch them whenever you are reading.I think a redesign is required for your camel route.

Changing from endpoint parameters such as URLs etc., following procedure has to be used according to dynamic change endpoint camel:
stop the route
remove the route
change the endpoint
add the route
start the route
If the to endpoint has to be configurable, you may use the recipient list component. Here you may read properties from a database and/or from the filesystem using the appropriate Camel component.

Is it possible to manually set JMS properties when using WMQ API?

I have traditional (com.ibm.mq.jar) MQ application in Java for testing purpose. Now I need to use that application to send some messages to JMS. When I try to set any JMS property on MQ message, for example:
message.setStringProperty("JMSDestination", "queue:///" + queueName);
I always get error: 2471 - MQRC_PROPERTY_NOT_AVAILABLE. It works if I just remove JMS from the property name.
Is it possible to set JMS properties directly on MQMessage? What is a correct way to do that on MQ level?
Btw. I have the same application in .NET where setting JMS properties this way is possible so I'm only trying to use the same code in Java.

It is not allowed to do this manually. Please use the JMS API to set JMS properties.
Restrictions to MQ properties are explained here.
One thing is interessting in that document page though,
The names of properties specified directly as MQRFH2 elements are not guaranteed to be validated by the MQPUT call.
You could perhaps work around this, on a short term basis. There seems to be no guarantee that setting the MQRFH2 elements directly will not be validated, though.

Websphere JMS: Unable to deserialize object

I am using Websphere MQ 6.x and I am getting the following exception thrown when an object is read from the queue.
Caused by: javax.jms.MessageFormatException: MQJMS1061: Unable to deserialize object
at com.ibm.jms.JMSMessage.newMessageFormatException(JMSMessage.java:4982)
at com.ibm.jms.JMSObjectMessage.getObject(JMSObjectMessage.java:289)
I am able to see the serialized version of the message (class) using WMQ Tool. But when the application reads it this exception happens.
Any ideas why?

I think a early version 6.x had a problem with primitive types. Maybe its this:http://www-01.ibm.com/support/docview.wss?uid=swg1IC50448

have you tried trying to read and write the messages from the queue using other tools besides your application?
You can try and see if you can read and write the messages to your queues using RFH Util for example or MQ Explorer to see if the problem is with your application or with the MQ infrastructure.
What is the application that is reading the message from the MQ Queue?
HTH
Manglu

Is it possible that the application reading the message does not have the class in it's classpath ? Or a more subtle issue, it may not be visible to the thread's context classloader.
Do you have a longer stack trace that might supply more information ?

Spring beans based on properties

I am wondering if the below is possible in Spring
Read a property file using spring - this file has a list of jms queue names
Make spring loop on the above list and define beans that define Apache camel routes from that queue to a file
I could just create the routes using java code on the apache camel context, but wondering if it is possible through spring.

Reading a property file in a Spring XML wiring file is easy; e.g. using a PropertiesFactoryBean. However, the second part of the problem cannot (I believe) be solved without writing a significant amount of Java code.
I suggest that you read Section 3.8.3 of the Spring Reference that describes how to write your own FactoryBean classes. Another possibility is to create a custom Java configuration bean as described in Section 3.11. There may be other possibilities too.
Warning: none of this stuff is particularly straight-forward if you are coming at it for the first time.