JAXB-runtime lib in IntelliJ Plugin



I'm struggling with the use of JAXB in my IntelliJ plugin. The short version: I think my problem is how to properly include a runtime-only library in my plugin.

In more detail:

In the instantiation of my plugin, I want to parse one or more XML files. So I generated classes from an xsd using the IntelliJ tool, which uses xjc.

I added the neccessary gradle dependencies 

I know that the second dep is neccessary, as a runtime is needed. But it is not found at runtime. I get the error

jakarta.xml.bind.JAXBException: Implementation of Jakarta XML Binding-API has not been found on module path or classpath.
- with linked exception:
[java.lang.ClassNotFoundException: org.glassfish.jaxb.runtime.v2.ContextFactory]

By debugging, I see that the class loader does not find an implementation. 
The jaxb-runtime.lib is present in my idea-sandbox/plugins/my-plugin/lib directory, among the other libs.

When I extract all parts into a tiny java program, everything works. The runtime lib is found. So this seems to be a difference in the class loader handling in IntelliJ plugins.

Can someone explain me why in case of a plugin the runtime-lib is not found?

Thank you very much!


I found the reason: JAXB loads the implementation at runtime - “For this to work in a plugin, the context class loader must be set to the plugin's classloader and restored afterwards with the original one around initialization code”.



Now it works.


Rejoiced too soon. This solution only works in local configuration, but not after installing the plugin.


Any thoughts would be appreciated.


For those who struggle with this problem, here's my solution:

I still generate JAXB classes using Intellij, which uses xjc. Afterwards, in the generated sources I replace all “import jakarta.xml” with “import javax.xml”.

In gradle, I use “Old JAXB Runtime” (implementation("com.sun.xml.bind:jaxb-impl:4.0.5")). It is still under support and works like a charm.



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