Clojure

case gives NPE when used with nil

Details

  • Type: Defect Defect
  • Status: Closed Closed
  • Priority: Major Major
  • Resolution: Completed
  • Affects Version/s: Release 1.2
  • Fix Version/s: Release 1.3
  • Component/s: None
  • Labels:
    None
  • Patch:
    Code and Test
  • Approval:
    Ok

Description

This code gives a NullPointerException:

(case nil
nil "foo")

If fixing this is impossible for implementation reasons, at least the documentation and error messages should be improved.

Activity

Descending order - Click to sort in ascending order
Hide
Permalink
Stuart Sierra added a comment -

Patch 0702-fix-npe-in-nil-case-3.patch.gz replaces previous patches, but preserves correct commit messages and authors.

Show
Stuart Sierra added a comment - Patch 0702-fix-npe-in-nil-case-3.patch.gz replaces previous patches, but preserves correct commit messages and authors.
Hide
Permalink
Stuart Halloway added a comment -

waiting on Stuart's patch tweak

Show
Stuart Halloway added a comment - waiting on Stuart's patch tweak
Hide
Permalink
Stuart Sierra added a comment -

Oops. Sorry. Will fix.

Show
Stuart Sierra added a comment - Oops. Sorry. Will fix.
Hide
Permalink
Aaron Bedra added a comment -

Stuart, your patch replaces the original patch and the commit message doesn't reveal the intent of the fix. It also overwrites me as the original patch submitter.

Show
Aaron Bedra added a comment - Stuart, your patch replaces the original patch and the commit message doesn't reveal the intent of the fix. It also overwrites me as the original patch submitter.
Hide
Permalink
Stuart Sierra added a comment -

New patch 0702-fix-npe-in-nil-case-2.patch.gz adds a test.

Show
Stuart Sierra added a comment - New patch 0702-fix-npe-in-nil-case-2.patch.gz adds a test.
Hide
Permalink
Rich Hickey added a comment -

looks ok at first glance

Show
Rich Hickey added a comment - looks ok at first glance
Hide
Permalink
Aaron Bedra added a comment -

Rich, this seems to solve the issue demonstrated in this ticket. I don't have full context on all possible impact points here. Can you please take a look at this and let me know if I missed anything?

Show
Aaron Bedra added a comment - Rich, this seems to solve the issue demonstrated in this ticket. I don't have full context on all possible impact points here. Can you please take a look at this and let me know if I missed anything?
Hide
Permalink
Aaron Bedra added a comment -

Thanks Rich. I will take this one and get a patch in hopefully today.

Show
Aaron Bedra added a comment - Thanks Rich. I will take this one and get a patch in hopefully today.
Hide
Permalink
Rich Hickey added a comment -

First step in fixing a problem is to understand it. The exception is thrown during compilation and the stack trace points to c.l.Compiler$ObjExpression.constantType()

Show
Rich Hickey added a comment - First step in fixing a problem is to understand it. The exception is thrown during compilation and the stack trace points to c.l.Compiler$ObjExpression.constantType()
Hide
Permalink
a_strange_guy added a comment -

I think that the case macro should just generate a null check before calling hashcode on a value. The same way protocol functions automatically check for null before dispatching.

Show
a_strange_guy added a comment - I think that the case macro should just generate a null check before calling hashcode on a value. The same way protocol functions automatically check for null before dispatching.
Hide
Permalink
Aaron Bedra added a comment -

What would be the desired fix look like for this? Should this be a documentation update or should this be updated to not produce an NPE?

Show
Aaron Bedra added a comment - What would be the desired fix look like for this? Should this be a documentation update or should this be updated to not produce an NPE?

People

Vote (1)
Watch (1)

Dates

  • Created:
    Updated:
    Resolved:
Atlassian JIRA (v4.4#649-r158309) | Report a problem
Powered by a free Atlassian JIRA open source license for Clojure. Try JIRA - bug tracking software for your team.