Voilà les logs une fois qu'il m'avoir dit qu'il y a une erreur :
[2016-01-28 17:56:41] Executing bootstrap tasks
[2016-01-28 17:56:41] Product org.eclipse.products.epp.package.java.mars
[2016-01-28 17:56:41] Bundle org.eclipse.oomph.setup 1.2.0.v20150915-0926, build=1814, branch=eb0b1f7778043c7fd6d4905affdf226f3b346cb2, commit=eb0b1f7778043c7fd6d4905affdf226f3b346cb2
[2016-01-28 17:56:41] Bundle org.eclipse.oomph.setup.core 1.2.0.v20150915-0926, build=1814, branch=eb0b1f7778043c7fd6d4905affdf226f3b346cb2, commit=eb0b1f7778043c7fd6d4905affdf226f3b346cb2
[2016-01-28 17:56:41] Bundle org.eclipse.oomph.setup.p2 1.2.0.v20150915-0926, build=1814, branch=eb0b1f7778043c7fd6d4905affdf226f3b346cb2, commit=eb0b1f7778043c7fd6d4905affdf226f3b346cb2
[2016-01-28 17:56:41] Performing P2 Director (Eclipse IDE for Java Developers (Mars))
[2016-01-28 17:56:41] Offline = false
[2016-01-28 17:56:41] Mirrors = true
[2016-01-28 17:56:41] Resolving 5 requirements from 3 repositories to C:\Users\Tristan\eclipse\java-mars2\eclipse
[2016-01-28 17:56:41] Requirement epp.package.java [4.5.0,4.6.0)
[2016-01-28 17:56:41] Requirement org.eclipse.platform.feature.group [4.5.0,4.6.0)
[2016-01-28 17:56:41] Requirement org.eclipse.rcp.feature.group [4.5.0,4.6.0)
[2016-01-28 17:56:41] Requirement org.eclipse.jdt.feature.group [3.11.0,3.12.0)
[2016-01-28 17:56:41] Requirement org.eclipse.oomph.setup.feature.group
[2016-01-28 17:56:41] Repository
http://download.eclipse.org/technology/epp/packages/mars
[2016-01-28 17:56:41] Repository
http://download.eclipse.org/releases/mars/201510021000
[2016-01-28 17:56:41] Repository
http://download.eclipse.org/oomph/updates/milestone/latest
[2016-01-28 17:56:54] Calculating requirements and dependencies.
[2016-01-28 17:56:58] Computing prerequisite plan
[2016-01-28 17:57:06] Downloading epp.package.java.executable.win32.win32.x86_64
[2016-01-28 17:57:07] Downloading org.eclipse.platform.ide.executable.win32.win32.x86_64
[2016-01-28 17:57:07] Downloading org.eclipse.platform_root
[2016-01-28 17:57:07] Downloading org.eclipse.rcp_root
[2016-01-28 17:57:12] An error was detected while performing the engine operation and the changes are being rolled back. See the log for details.
[2016-01-28 17:57:12] ERROR: org.eclipse.equinox.p2.engine code=4 An error occurred during the org.eclipse.equinox.internal.p2.engine.phases.CheckTrust phase.
at org.eclipse.oomph.util.OomphPlugin.coreException(OomphPlugin.java:282)
at org.eclipse.oomph.p2.internal.core.ProfileTransactionImpl$3.commit(ProfileTransactionImpl.java:523)
at org.eclipse.oomph.p2.internal.core.ProfileTransactionImpl.commit(ProfileTransactionImpl.java:328)
at org.eclipse.oomph.setup.p2.impl.P2TaskImpl.perform(P2TaskImpl.java:709)
at org.eclipse.oomph.setup.internal.core.SetupTaskPerformer.doPerformNeededSetupTasks(SetupTaskPerformer.java:2971)
at org.eclipse.oomph.setup.internal.core.SetupTaskPerformer.performNeededSetupTasks(SetupTaskPerformer.java:2900)
at org.eclipse.oomph.setup.internal.core.SetupTaskPerformer.performTriggeredSetupTasks(SetupTaskPerformer.java:2881)
at org.eclipse.oomph.setup.internal.core.SetupTaskPerformer.perform(SetupTaskPerformer.java:2775)
at org.eclipse.oomph.setup.internal.installer.SimpleVariablePage.installPerform(SimpleVariablePage.java:1151)
at org.eclipse.oomph.setup.internal.installer.SimpleVariablePage.access$27(SimpleVariablePage.java:1030)
at org.eclipse.oomph.setup.internal.installer.SimpleVariablePage$18.run(SimpleVariablePage.java:976)
ERROR: org.eclipse.equinox.p2.engine code=0 session context was
profile=C__Users_Tristan_eclipse_java-mars2_eclipse, phase=org.eclipse.equinox.internal.p2.engine.phases.CheckTrust, operand=, action=).
ERROR: org.eclipse.equinox.p2.engine code=0 Error reading signed content.
java.io.FileNotFoundException: C:\Users\Tristan\.p2\pool\plugins\org.eclipse.aether.api_1.0.1.v20141111.jar (Le fichier spécifié est introuvable)
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:219)
at java.util.zip.ZipFile.<init>(ZipFile.java:149)
at java.util.zip.ZipFile.<init>(ZipFile.java:163)
at org.eclipse.osgi.internal.signedcontent.SignedBundleHook.getSignedContent(SignedBundleHook.java:209)
at org.eclipse.equinox.internal.p2.engine.phases.CertificateChecker.checkCertificates(CertificateChecker.java:73)
at org.eclipse.equinox.internal.p2.engine.phases.CertificateChecker.start(CertificateChecker.java:54)
at org.eclipse.equinox.internal.p2.engine.phases.CheckTrust.completePhase(CheckTrust.java:50)
at org.eclipse.equinox.internal.p2.engine.Phase.postPerform(Phase.java:251)
at org.eclipse.equinox.internal.p2.engine.Phase.perform(Phase.java:101)
at org.eclipse.equinox.internal.p2.engine.PhaseSet.perform(PhaseSet.java:47)
at org.eclipse.equinox.internal.p2.engine.Engine.perform(Engine.java:75)
at org.eclipse.equinox.internal.p2.engine.Engine.perform(Engine.java:44)
at org.eclipse.equinox.internal.provisional.p2.director.PlanExecutionHelper.executePlan(PlanExecutionHelper.java:42)
at org.eclipse.oomph.p2.internal.core.ProfileTransactionImpl$3.commit(ProfileTransactionImpl.java:519)
at org.eclipse.oomph.p2.internal.core.ProfileTransactionImpl.commit(ProfileTransactionImpl.java:328)
at org.eclipse.oomph.setup.p2.impl.P2TaskImpl.perform(P2TaskImpl.java:709)
at org.eclipse.oomph.setup.internal.core.SetupTaskPerformer.doPerformNeededSetupTasks(SetupTaskPerformer.java:2971)
at org.eclipse.oomph.setup.internal.core.SetupTaskPerformer.performNeededSetupTasks(SetupTaskPerformer.java:2900)
at org.eclipse.oomph.setup.internal.core.SetupTaskPerformer.performTriggeredSetupTasks(SetupTaskPerformer.java:2881)
at org.eclipse.oomph.setup.internal.core.SetupTaskPerformer.perform(SetupTaskPerformer.java:2775)
at org.eclipse.oomph.setup.internal.installer.SimpleVariablePage.installPerform(SimpleVariablePage.java:1151)
at org.eclipse.oomph.setup.internal.installer.SimpleVariablePage.access$27(SimpleVariablePage.java:1030)
at org.eclipse.oomph.setup.internal.installer.SimpleVariablePage$18.run(SimpleVariablePage.java:976)
[2016-01-28 17:57:12]