Hi Reece,

If you install your Java code as JAR file in the repository [1], the
code will be loaded and unloaded every time when your query is
executed. If you get an error message…

  java.lang.reflect.InaccessibleObjectException: Unable to make field
private final jdk.internal.loader.URLClassPath
java.net.URLClassLoader.ucp accessible: module java.base does not
"opens java.net" to unnamed module @79e2c065

…unloading fails [2], as you’re probably using a more recent version
of the JDK, which restricts reflective access to internal variables.
You can get around this by adding Java flags at startup time:

 --add-opens java.base/java.net=ALL-UNNAMED
 --add-opens java.base/jdk.internal.loader=ALL-UNNAMED

Maybe there are better solutions to unload JAR files today.
Suggestions are welcome!

Hope this helps,
Christian

[1] https://docs.basex.org/wiki/Repository#Java
[2] https://github.com/BaseXdb/basex/blob/master/basex-core/src/main/java/org/basex/util/JarLoader.java#L34



On Tue, Apr 20, 2021 at 6:44 PM Reece Dunn <msclrhd@googlemail.com> wrote:
>
> Hi all,
>
> I'm working on a Java class that I'm importing into an XQuery, so I can do additional processing on the data that isn't easily expressible in XQuery (or XSLT). In order to get BaseX to pick up a modified version of the jar file I'm building, I'm restarting the BaseX http server.
>
> This makes it slower to turn around testing the changes. Is there a better way of doing this?
>
> Kind regards,
> Reece