ImmutableMap may not be using proper equals () method

[GoogleCodeExporter]

I have a `Map <Transcription, File> m`. Transcription is user defined, with a 
user defined `equals ()` method. When I define a new Transcription t, and call 
m.get (t), it works properly, but when I use `ImmutableMap.copyOf (m).get (t)`, 
it returns `null`.

Original issue reported on code.google.com by capidepa...@gmail.com on 10 Aug 2011 at 5:45

[GoogleCodeExporter]

I also get false if I run:

`ImmutableMap.copyOf (m).keySet ().contains (t);`

Original comment by capidepa...@gmail.com on 10 Aug 2011 at 5:47

[GoogleCodeExporter]

My best guess is that you forgot to implement the hashCode() method. When you 
use a Map / Set, the equals contract *mandates* that you should override 
hashCode() when you override equals().

Original comment by nev...@gmail.com on 10 Aug 2011 at 9:38

[GoogleCodeExporter]

That seems most likely. Closing unless/until we hear from 'capidepa...' again

Original comment by kevin...@gmail.com on 11 Aug 2011 at 1:51

• Changed state: Invalid
• Added labels: Type-Defect

[GoogleCodeExporter]

my bad. I didn't know you had to set hashCode() too.

Original comment by capidepa...@gmail.com on 11 Aug 2011 at 2:50

[GoogleCodeExporter]

This issue has been migrated to GitHub.

It can be found at https://github.com/google/guava/issues/<id>

Original comment by cgdecker@google.com on 1 Nov 2014 at 4:15

• Added labels: MigratedToGitHub

[GoogleCodeExporter]

Original comment by cgdecker@google.com on 3 Nov 2014 at 9:09

• Added labels: Restrict-AddIssueComment-Commit