Error "Comparison method violates its general contract!" when installing any Eclipse plugin -


(i've read this question, answer doesn't solve problem, don't mark 1 duplicate)

i have fresh installation of eclipse (eclipse php developers / helios release / build id: 20100617-1415 on windows 7 x86) can't install plugin or addition. neither official plugins repository, nor user-provided urls.

installation, of tiny plugins takes "years" (starting @ 10-20 minutes, ending on over hour) though i'm on quite fast internet connection (around 2 mb/s), strange itself. , ends same error message:

an error occurred while collecting items installed session context was:(profile=epp.package.php, phase=org.eclipse.equinox.internal.p2.engine.phases.collect, operand=, action=). comparison method violates general contract! comparison method violates general contract!

error message same, mentioning epp.package.php, no matter, plugin i'm trying install. assume, eclipse-related, not plugin-related problem.

i did reasearch on stackexchange (many similar topics programming question, related errors in java or javascript code) , in internet in genereal. thing directly related eclipse, found this forum topic saying know bug in eclipse. though bug marked resolved fixed, tried adapt 1 of proposed quick solutions of starting eclipse with:

eclipse.exe -djava.util.arrays.uselegacymergesort=true

(other, similar sources unclear, whether there should space between -d , java.* or not)

but has brought no effect. again, installing small plugin official repository takes very, wrong , upon progress bar reaching around 20% (after 20-30 minutes) entire installation process ends above error.

i have newest available stable versions of eclipse php , jre.

i've read this question, brought me no closer solution. saw no difference, when starting eclipse java.util.arrays.uselegacymergesort=true switch , wasn't able update core eclipse newest version, because process failed same error.

and not explains, why installing takes incredibly long on fast connection?

is downgrading jre 6 option have?

the -djava.util.arrays.uselegacymergesort=true must come after -vmargs switch, changes command line specifying eclipse launch arguments arguments jvm, -d be.

use solution or upgrade @ least indigo sr2.


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