`java.util.Optional<java.lang.String>` not supported by default

[serdelal]

Hello!

First of all, thanks for the hard work!

Im Sergio, im currently working on a client where this json logger is been used. The issue is that this client is using Mule runtime 4.4.0 and jdk 8 nowadays, so Im trying to move forward to Mule runtime 4.9 and jdk 17. But Im facing an issue in multiple APIs. There are some scripts defined in the "content" field of the connector where an error is triggered:

Caused by: com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Java 8 optional type java.util.Optional<java.lang.String> not supported by default: add Module "com.fasterxml.jackson.datatype:jackson-datatype-jdk8" to enable handling (through reference chain: org.mule.extension.jsonlogger.api.pojos.LoggerProcessor["content"]->org.mule.runtime.module.extension.internal.runtime.resolver.ParameterResolverValueResolverWrapper$1["expression"])

For example, this error is shown when in the "content" field there is something like "payload.name?". I have resolved this kind of issue, but it seems that this error occurs for some dataweave functions like "mask".

Has anyone else experienced this problem?

Thanks!

[mtransier]

The error is triggered when there is an error in the DataWeave script for the content, it is a follow-up error.
In a quick test payload.name? is properly logged without any issues as long as payload is an object (and not a string, e.g.). If it is an invalid expression trying to access a property on a string, this will raise the Java 8 error.
It is not a functional issue with the JSON logger, however, there are more and more people stumbling over it, so I am thinking about including that additional dependency. The downside is, other people also complain about the size of the logger dependency (which is not that big, btw) and adding another dependency will further increase the size of the jar.