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Handle NoClassDefFoundError when determining class type #186

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plexus
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@plexus plexus commented Jan 22, 2017

When resolve-missing gets a number of candidate classes, it will load them to
determine the type (Clojure type/record vs regular Java class). However a class
on the classpath may be compiled with dependencies that are not currently
present, causing the loading to fail.

This would cause the whole operation to fail, instead this change handles the
exception, takes it as a sign that it's a regular Java class, and continues.

For example, I do a resolve-missing on the symbol URL, this yields two
candidates: java.net.URL, and
com.gargoylesoftware.htmlunit.javascript.host.URL. The latter depends on
org.w3c.dom.ElementTraversal, which is not currently present, causing a
NoClassDefFoundError.

Before submitting a PR make sure the following things have been done (and denote this
by checking the relevant checkboxes):

  • All tests are passing (run lein do clean, test)
  • Code inlining with mranderson works and tests pass with inlined code (run ./build.sh install -- takes a long time)
  • You've updated the changelog (if adding/changing user-visible functionality)

Thanks!

plexus and others added 2 commits January 22, 2017 13:47
When `resolve-missing` gets a number of candidate classes, it will load them to
determine the type (Clojure type/record vs regular Java class). However a class
on the classpath may be compiled with dependencies that are not currently
present, causing the loading to fail.

This would cause the whole operation to fail, instead this change handles the
exception, takes it as a sign that it's a regular Java class, and continues.

For example, I do a `resolve-missing` on the symbol URL, this yields two
candidates: `java.net.URL`, and
`com.gargoylesoftware.htmlunit.javascript.host.URL`. The latter depends on
`org.w3c.dom.ElementTraversal`, which is not currently present, causing a
`NoClassDefFoundError`.
@expez
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expez commented Jan 22, 2017

Merged this one manually after trying the 'resolve conflicts' button on github and getting an unexpected result.

Thanks for the patch! 👍

@expez expez closed this Jan 22, 2017
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2 participants