Svatopluk Dedic created NETBEANS-6305:
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Summary: ProjectManager.find() return null for project dir - race
between Git and Projects
Key: NETBEANS-6305
URL: https://issues.apache.org/jira/browse/NETBEANS-6305
Project: NetBeans
Issue Type: Bug
Components: projects - Generic Infrastructure, versioncontrol - Git
Reporter: Svatopluk Dedic
Assignee: Jaroslav Tulach
Attachments: git-project-race1.png
I was trying to write some gradle projects tests using NbModuleSuite – the plan
was to create a simpel gradle project (just buildscript), then open it as a
project and inspect.
To my surprise, calls like FileObject.createAndOpen or
FileObject.getOuputStream() write (inside FS Atomic Action) resulted in the
project directory not being recognized at all ! When I tried to debug the
situation, a stop in the debugger (just a single thread) caused the project to
be found magically.
It turned to be a race between Git module (the workdir is created inside the
source tree managed by git) and the Project system: Git module runs as
extension to filesystems even inside FS Atomic Action (shown on a pictured
stacktrace from debugger) and executes {*}FileOwnerQuery{*}{*}.findOwner{*} on
the to-be-project directory before the buildscript is even created. The result
of *not being a project* is then cached - and the cache is reset asynchronously
when/after the project file is created.
But the test manages to call ProjectManager.findProject sooner, while the cache
still holds the negative result.
One of the screenshots shows a debugger that stopped in a situation when the
script file has been already created (a message in the output window), but
project manager call invoked *after* the creation does not find a project.
Uncommenting the m.invoke() line in HACK section will fix the situation -
caches must be reset.
The other screenshot is a debugger stopping when the to-be-project directory is
first inspected, showing that the directory's is yet empty.
// cc: [~entlicher]
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