Scalac fails to parse Google Protobuf2.x generated Java file

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|| || java version "1.6.0_16" ||
|| || Java(TM) SE Runtime Environment (build 1.6.0_16-b01) ||
|| || Java HotSpot(TM) 64-Bit Server VM (build 14.2-b01, mixed mode) ||
|| || maven2.1 ||
|| Versions that fail || ||
|| || scala-compiler and scala-library 2.7.3 ||
|| || scala-compiler and scala-library 2.7.6 ||
|| || scala-compile and scala-library 2.8.0-SNAPSHOT from http://scala-tools.org/repo-snapshots ||

$$ mvn compile[[br]]
.[[br]]
:[[br]]
[INFO] use scala command with args in file[[br]]
.../QueueMessage.java:627: error: reference to Builder is ambiguous;
it is imported twice in the same scope by[[br]]
import WorkUnit.[[br]]
and import Stage.[[br]]
public Builder toBuilder() { return newBuilder(this); }[[br]]
{{^}}[[br]]
one error found[[br]]

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Imported From: https://issues.scala-lang.org/browse/SI-2377?orig=1
Reporter: Jhon Honce (jwhonce)
Attachments:

• example.tgz (created on Sep 23, 2009 3:00:20 AM UTC, 19663 bytes)
• QueueMessage.2.java (created on Sep 22, 2009 5:02:37 PM UTC, 37180 bytes)
• QueueMessage.java (created on Sep 22, 2009 4:37:08 PM UTC, 36932 bytes)

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Jhon Honce (jwhonce) said:
Sample file that doesn't compile

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Jhon Honce (jwhonce) said:
Protobuf 2.2 version of file that still doesn't parse

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Jhon Honce (jwhonce) said:
Upgraded to Protobuf2.2 with same results.

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@jorgeortiz85 said:
I've also run this problem with Protobuf generated code. A workaround for this issue is to modify the generated Java code with the full path to Builder

public QueueMessage.Stage.Builder toBuilder() { return newBuilder(this); }

However, it's a pain to have to tweak generated code. I'd like to see this bug fixed.

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@paulp said:
As seems always to be the case, as soon as someone mentions "maven" they're describing a bug that I cannot reproduce.

[paulp@jon 2377 (master)]$$ scalac273 QueueMessage.java 
[paulp@jon 2377 (master)]$$ scalac273 QueueMessage.2.java 
[paulp@jon 2377 (master)]$$ scalac276 QueueMessage.java 
[paulp@jon 2377 (master)]$$ scalac276 QueueMessage.2.java 
[paulp@jon 2377 (master)]$$ scalac28 QueueMessage.java 
[paulp@jon 2377 (master)]$$ scalac28 QueueMessage.2.java 
[paulp@jon 2377 (master)]$$ 

If you think this is not some sort of maven configuration bug, please tell me how to reproduce it without involving maven (else this ticket will be closed as invalid.)

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Jhon Honce (jwhonce) said:
Maven-free example of issue

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Jhon Honce (jwhonce) said:
Should have thought to try just one file before submitting the problem. The issue is an interaction between a list of Java and Scala files.

It's not pretty but I attached a tar file with the source files and a bash script showing how the compiler is being invoked. I couldn't include my scala jars because of the upload size limit so you will need to tweak the script to point to your jars before the script will run. I downloaded and built the latest nightly build and can reproduce the issue.

There will be a list compiler errors because I only included a subset of files that I found to show the issue. My friend "the ambiguous Builder" message is buried in there.

Please let me know if I can provide any other information. TIA for your efforts.

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@paulp said:
Your job as a bug reporter is to isolate the bug as much as possible. You are very derelict in this duty, and it cost me a lot of time. However since I am still very keen on seeing jorge ortiz at 3rd and howard wearing a sandwich board (and let's see: I got scalacheck working, I fixed the 5.days bug, and now this -- gentlemen, warm up your boards!) this is fixed in r18756.

Oh, and to see the kind of bug isolation I would have appreciated, examine the test case at http://lampsvn.epfl.ch/trac/scala/browser/scala/trunk/test/files/pos/t2377/ .