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Re: [m2e-users] [m2eclipse-user] eclipse hang/crash with latest m2eclipse, help?

Dealing with general "flakiness" is actually on top of
our todo list for the next m2e version. Our current plan is to make m2e
much more conservative about what maven plugins get executed during
eclipse build. m2e will simply refuse to run plugins it does not know
about and mark the project as unsupported. There is some info on the
wiki [1] about this work and we are welcome any feedback.

As for debugging, I'd probably start with setting up custom build
minimal lifecycle mapping, as described in [2], then add any mojo
execution required to compile and run the tests. If still see the
problem, then use a profiler like Yourkit to see if there are any leaked



PS: please use m2e-users@xxxxxxxxxxx mailing list

On 10-11-18 08:52 AM, Benson Margulies wrote:
Mr. van Zyl,

I would, believe it or not, really like to be helpful here. I'd like
CXF to be able to stop maintaining the complex m-e-p system that I
also use in my day job. I'd like to be able to move the developers who
work at my day job from m-e-p to m2e.

Generally, running out of PermGen space takes some doing, given what
goes in there. I would hope that, as a general Maven issue, it would
command some attention. CXF uses a rather boring collection of plugins
(checkstyle, pmd, plus a few very very simple ones of its own). The
project I hit this with first also runs the hibernate codegen in
exactly one project, and some very simple plugins that I wrote. If you
can give me any sort of a pointer in the direction of how to track
down a permgen leak in a plugin, I'll go debug at it and post results
and/or a patch.

--benson margulies

On Thu, Nov 18, 2010 at 8:05 AM, Jason van Zyl<jason@xxxxxxxxxxxx>  wrote:
At least that gives us something to start with. When we have time we'll take
On Nov 18, 2010, at 6:58 AM, Benson Margulies wrote:

OK, I have one for you.

And I cannot send you the auto-package, of course, since Eclipse hangs.

The URL might be a trifle familiar, at least in part.

Import all packages from:


On Wed, Nov 17, 2010 at 10:09 PM, Jason van Zyl<jason@xxxxxxxxxxxx>  wrote:

We don't need you to make test cases, you need to give us a set of projects

that reproduces the problem.

 From that point we can at least try to track down the problem.

Seriously, from what you've provided we can't do nothing. You can use Help>

Report Maven Issue ... and that will package up the projects, all the

configurations and log files so we'll have what you have. If it's a private

project then you have to get a little more creative or you can send it to us

privately. Or scrub out the sources and leave some fake sources and see if

the problem still happens and send that to us.

It's usually plugins that kill permgen and not Maven or M2Eclipse itself

which is why it's necessary the problem expressed in the project that's

causing the problems.

On Nov 17, 2010, at 9:32 PM, Benson Margulies wrote:

Really, hanging the Eclipse JVM hard should not be possible with a

plugin interaction.

However, I continued to investigate, and found the explanation. Maven

has soaked up a vast quantity of permgen space. When it runs Eclipse

out of permgen space, it's 'game over'.

I had to configure max perm gen to 512m.

While my projects are numerous, they're not vastly numerous, and none

of them do anything particularly abstruse.

I've now been a Maven user, and in fact evangelist in a small way, for

some time now, and I am somewhat frustrated with the view that us

users are 100% responsible for dealing with the difficulty of

converting abstruse maven problems into portable reproducable tests


Of course I do not expect you to hand me a solution to this sort of

thing on place, but I could help for some assistance in penetrating

the fog of war to learn what sort of problem I have.

If the problem lent itself to a small repro, I would have posted a

JIRA with a small repro. How about responding with some ideas about

how to get logging traffic out of M2ECLIPSE? I did not spot any place,

in a brief tour of the properties panes, where I could throw in a '-X'

in the hopes of learning something.

If eating all the permgen space disturbs you, as I might hope it

would, I'll happily invest some time in following whatever procedure

you might offer for investigating the problem. However, it's not

realistic for me to try to build a portable model of a collection of

30 projects in the hope that it would reproduce this effect.

On Wed, Nov 17, 2010 at 9:13 PM, Jason van Zyl<jason@xxxxxxxxxxxx>  wrote:

This honestly doesn't help much.

Could be anything configured in your plugins interacting poorly with Maven.

We need something we can reproduce to help.

On Nov 17, 2010, at 3:59 PM, Benson Margulies wrote:

Version: Helios Service Release 1

Build id: 20100917-0705


Maven 2.1.0.

I import my collection of projects, which is about 40 projects.

Building happens for a while until the Workspace percentage reaches 54%.

Eclipse hangs. jconsole loses its connection. Just before the hang,

memory usage was at 300Mb of heap.

I'm on MacOSX 10.6.4, current Java. I've got -Xmx1g in eclipse.ini.




Jason van Zyl

Founder,  Apache Maven


Our achievements speak for themselves. What we have to keep track

of are our failures, discouragements and doubts. We tend to forget

the past difficulties, the many false starts, and the painful

groping. We see our past achievements as the end result of a

clean forward thrust, and our present difficulties as

signs of decline and decay.

  -- Eric Hoffer, Reflections on the Human Condition




Jason van Zyl

Founder,  Apache Maven


A party which is not afraid of letting culture,

business, and welfare go to ruin completely can

be omnipotent for a while.

   -- Jakob Burckhardt




Jason van Zyl

Founder,  Apache Maven


What matters is not ideas, but the people who have them. Good people can fix bad ideas, but good ideas can't save bad people.

  -- Paul Graham




Jason van Zyl

Founder,  Apache Maven


We know what we are, but know not what we may be.

   -- Shakespeare



Jason van Zyl
Founder,  Apache Maven
the course of true love never did run smooth ...

  -- Shakespeare



Jason van Zyl
Founder,  Apache Maven
To do two things at once is to do neither.

  -—Publilius Syrus, Roman slave, first century B.C.

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