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Get "Duplicate method name&signature" on recompile only #5938

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scabug opened this issue Jun 17, 2012 · 14 comments
Closed

Get "Duplicate method name&signature" on recompile only #5938

scabug opened this issue Jun 17, 2012 · 14 comments
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bytecode regression
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2.11.5

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@scabug
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scabug commented Jun 17, 2012

The attached program (bug.scala) compiles and runs correctly when initially built. However, if I trivially modify the source file via the editor or 'touch' and then recompile, the JVM fails with a "Duplicate method name&signature" exception.

Specifically:

$ fsc -shutdown; fsc -max-idle 0
[Compile server exited]
[...elided...]
Disabling idle timeout on compile server.
$ scala ca.blit.bug.W
$ touch bug.scala
$ fsc bug.scala
$ scala ca.blit.bug.W
Exception in thread "main" java.lang.ClassFormatError: Duplicate method name&signature in class file ca/blit/bug/W
at java.lang.ClassLoader.defineClass1(Native Method)
at java.lang.ClassLoader.defineClass(ClassLoader.java:634)
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:14
[...]

Restarting the compile server between builds seems to be sufficient to produce correct output; you don't need to delete the existing class files.

Downgrading to Scala 2.9.1-1 fixed the problem.
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scabug commented Jun 17, 2012

Imported From: https://issues.scala-lang.org/browse/SI-5938?orig=1
Reporter: Chris Reuter (suetanvil)
Affected Versions: 2.9.2
Attachments:

  • bug.scala (created on Jun 17, 2012 5:37:33 PM UTC, 278 bytes)

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scabug commented Jun 18, 2012

@jsuereth said:
This needs to go through triage.

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scabug commented Jul 3, 2012

@adriaanm said:
reproduced on 2.10.0-M4

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scabug commented Jul 3, 2012

@adriaanm said:
Greg, could you please have a look what might have happened between 2.9.1-1 and 2.9.2 that caused this regression?

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scabug commented Jul 3, 2012

@gkossakowski said:
I'm not an expert on fsc but I'll have a look tomorrow.

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scabug commented Sep 28, 2012

Dustin Carlino (dabreegster) said:
I'm still observing this in 2.10.0-20120924-042318-ffaa3cb89e, one of the nightly builds. Any news on this?

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scabug commented Nov 7, 2012

hkoehler said:
I experienced the same problem (different code but also a swing app) with fsc on scala 2.9.2. Downgrading to 2.9.1 or 2.9.0 didn't fix it, but it compiled fine under 2.8.2.

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scabug commented May 7, 2013

Ryan Hendrickson (ryan.hendrickson_bwater) said:
Appears to still be unfixed in nightly 2.11.0-20130503-022659-6eb33d4ad1. Any news?

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scabug commented May 20, 2013

@JamesIry said:
2.10.2 is about to be cut. Kicking down the road and un-assigning to foster work stealing.

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scabug commented Feb 10, 2014

@adriaanm said:
Since 2.11.0-RC1 is one week away, pushing all non-blockers without PR to 2.11.1-RC1. Please undo the change if I missed work in progress.

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scabug commented Aug 5, 2014

@gkossakowski said:
The 2.11.2 is out so I'm rescheduling the issue for 2.11.3.

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scabug commented Nov 4, 2014

@retronym said:
Updating fix-by version to 2.11.5.

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scabug commented Nov 6, 2014

@retronym said (edited on Nov 6, 2014 8:31:12 AM UTC):
This is fixed already in 2.11.5-SNAPSHOT, presumably by scala/scala#4040. I'll submit a test case before closing this ticket.

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scabug commented Nov 7, 2014

@retronym said:
scala/scala#4103

@scabug scabug closed this as completed Nov 21, 2014
@scabug scabug added this to the 2.11.5 milestone Apr 7, 2017
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