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Test project demonstrating problems in executing long-running tasks with Gradle.

The rootprj contains two sub-projects - subprj1 and subprj2. subprj2 depends on subprj1. Both sub-projects have a task - runMain - to execute a long-running java program.

My environment is:

$ gradle --version

------------------------------------------------------------
Gradle 1.11
------------------------------------------------------------

Build time:   2014-02-11 11:34:39 UTC
Build number: none
Revision:     a831fa866d46cbee94e61a09af15f9dd95987421

Groovy:       1.8.6
Ant:          Apache Ant(TM) version 1.9.2 compiled on July 8 2013
Ivy:          2.2.0
JVM:          1.7.0_51 (Oracle Corporation 24.51-b03)
OS:           Mac OS X 10.9.2 x86_64

$

To reproduce the problem:

  1. Open a console window and run:
$ cd rootprj/subprj1
$ gradle clean runMain
:subprj1:clean UP-TO-DATE
:subprj1:compileJava
:subprj1:processResources UP-TO-DATE
:subprj1:classes
:subprj1:runMain
Tue Jul 08 15:06:51 PDT 2014: time now is 1404857211634
Tue Jul 08 15:06:53 PDT 2014: time now is 1404857213650
Tue Jul 08 15:06:55 PDT 2014: time now is 1404857215651
...
  1. In another console window, run:
$ cd rootprj/subprj2
$ gradle clean runMain
:subprj2:clean
:subprj1:compileJava UP-TO-DATE
:subprj1:processResources UP-TO-DATE
:subprj1:classes UP-TO-DATE
:subprj1:jar UP-TO-DATE
:subprj2:compileJava
:subprj2:processResources UP-TO-DATE
:subprj2:classes
:subprj2:runMain
Tue Jul 08 15:08:03 PDT 2014: time now is 1404857283642
Tue Jul 08 15:08:05 PDT 2014: time now is 1404857285659
...

  1. Kill the subprj2 build with Ctrl+C.

  2. Edit rootprj/subprj1/build.gradle file by adding an empty new line.

  3. Run subprj2 task again.

$ gradle clean runMain

FAILURE: Build failed with an exception.

* What went wrong:
A problem occurred configuring project ':subprj1'.
> Could not open buildscript class cache for build file '/Users/bthomas/play/gradle-bug/rootprj/subprj1/build.gradle' (/Users/bthomas/.gradle/caches/1.11/scripts/build_1f6069qdrrgscp5mnl8g0op12c/ProjectScript/buildscript).
  > Timeout waiting to lock buildscript class cache for build file '/Users/bthomas/play/gradle-bug/rootprj/subprj1/build.gradle' (/Users/bthomas/.gradle/caches/1.11/scripts/build_1f6069qdrrgscp5mnl8g0op12c/ProjectScript/buildscript). It is currently in use by another Gradle instance.
    Owner PID: unknown
    Our PID: 76798
    Owner Operation: unknown
    Our operation: Initialize cache
    Lock file: /Users/bthomas/.gradle/caches/1.11/scripts/build_1f6069qdrrgscp5mnl8g0op12c/ProjectScript/buildscript/cache.properties.lock

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 1 mins 3.108 secs
$

-- Binil Thomas [email protected]