I deleted ~/.eclipse and ~/workspace and executed the fix. After that i could enter this update site "http://directory.apache.org/studio/update/1.x" from here http://directory.apache.org/studio/downloads.html, but then the following error occurred:
An error occurred while collecting items to be installed session context was:(profile=PlatformProfile, phase=org.eclipse.equinox.internal.provisional.p2.engine.phases.Collect, operand=, action=). No repository found containing: osgi.bundle,com.ibm.icu.source,4.0.1.v20090822 No repository found containing: osgi.bundle,com.jcraft.jsch.source,0.1.41.v200903070017 No repository found containing: osgi.bundle,javax.servlet.jsp.source,2.0.0.v200806031607 No repository found containing: osgi.bundle,javax.servlet.source,2.5.0.v200806031605 No repository found containing: osgi.bundle,org.apache.ant.source,1.7.1.v20090120-1145 No repository found containing: osgi.bundle,org.apache.commons.codec,1.3.0.v20080530-1600 No repository found containing: osgi.bundle,org.apache.commons.codec.source,1.3.0.v20080530-1600 No repository found containing: osgi.bundle,org.apache.commons.el.source,1.0.0.v200806031608 No repository found containing: osgi.bundle,org.apache.commons.httpclient,3.1.0.v20080605-1935 No repository found containing: osgi.bundle,org.apache.commons.httpclient.source,3.1.0.v20080605-1935 No repository found containing: osgi.bundle,org.apache.commons.logging.source,1.0.4.v200904062259 No repository found containing: osgi.bundle,org.apache.jasper.source,5.5.17.v200903231320 No repository found containing: osgi.bundle,org.apache.lucene.analysis.source,1.9.1.v20080530-1600 No repository found containing: osgi.bundle,org.eclipse.ant.core.source,3.2.100.v20090817_r351 No repository found containing: osgi.bundle,org.eclipse.ant.ui.source,3.4.1.v20090901_r351 No repository found containing: osgi.bundle,org.eclipse.compare.core.source,3.5.0.I20090430-0408 No repository found containing: osgi.bundle,org.eclipse.compare.source,3.5.0.I20090514-0808 No repository found containing: osgi.bundle,org.eclipse.core.commands.source,3.5.0.I20090525-2000 No repository found containing: osgi.bundle,org.eclipse.core.contenttype.source,3.4.1.R35x_v20090826-0451 No repository found containing: osgi.bundle,org.eclipse.core.databinding.beans.source,1.2.0.I20090525-2000 No repository found containing: osgi.bundle,org.eclipse.core.databinding.observable.source,1.2.0.M20090902-0800 No repository found containing: osgi.bundle,org.eclipse.core.databinding.property.source,1.2.0.M20090819-0800 No repository found containing: osgi.bundle,org.eclipse.core.databinding.source,1.2.0.M20090819-0800 No repository found containing: osgi.bundle,org.eclipse.core.expressions.source,3.4.100.v20090429-1800 No repository found containing: osgi.bundle,org.eclipse.core.filebuffers.source,3.5.0.v20090526-2000 No repository found containing: osgi.bundle,org.eclipse.core.filesystem.source,1.2.0.v20090507 No repository found containing: osgi.bundle,org.eclipse.core.jobs.source,3.4.100.v20090429-1800 No repository found containing: osgi.bundle,org.eclipse.core.net.source,1.2.1.r35x_20090812-1200 No repository found containing: osgi.bundle,org.eclipse.core.resources.compatibility.source,3.4.0.v20090505 No repository found containing: osgi.bundle,org.eclipse.core.resources.source,3.5.1.R35x_v20090826-0451 No repository found containing: osgi.bundle,org.eclipse.core.runtime.compatibility.auth.source,3.2.100.v20090413 No repository found containing: osgi.bundle,org.eclipse.core.runtime.compatibility.registry.source,3.2.200.v20090429-1800 No repository found containing: osgi.bundle,org.eclipse.core.runtime.compatibility.source,3.2.0.v20090413 No repository found containing: osgi.bundle,org.eclipse.core.runtime.source,3.5.0.v20090525 No repository found containing: osgi.bundle,org.eclipse.core.variables.source,3.2.200.v20090521 No repository found containing: org.eclipse.update.feature,org.eclipse.cvs,1.1.101.R35x_v20090811-7E79FEd9KKF5H2UEPDBJ9L01A16 No repository found containing: osgi.bundle,org.eclipse.cvs.source,1.0.300.v20090520 No repository found containing: org.eclipse.update.feature,org.eclipse.cvs.source,1.1.101.R35x_v20090811-7E79FEd9KKF5H2UEPDBJ9L01A16 No repository found containing: osgi.bundle,org.eclipse.debug.core.source,3.5.0.v20090526-1600 No repository found containing: osgi.bundle,org.eclipse.debug.ui.source,3.5.1.v20090811_r351 No repository found containing: osgi.bundle,org.eclipse.ecf.filetransfer.source,3.0.0.v20090831-1906 No repository found containing: osgi.bundle,org.eclipse.ecf.identity.source,3.0.0.v20090831-1906 No repository found containing: osgi.bundle,org.eclipse.ecf.provider.filetransfer.httpclient.ssl.source,1.0.0.v20090831-1906 No repository found containing: osgi.bundle,org.eclipse.ecf.provider.filetransfer.ssl.source,1.0.0.v20090831-1906 No repository found containing: osgi.bundle,org.eclipse.ecf.source,3.0.0.v20090831-1906 No repository found containing: osgi.bundle,org.eclipse.ecf.ssl.source,1.0.0.v20090831-1906 No repository found containing: osgi.bundle,org.eclipse.equinox.app.source,1.2.0.v20090520-1800 No repository found containing: osgi.bundle,org.eclipse.equinox.common.source,3.5.1.R35x_v20090807-1100 No repository found containing: osgi.bundle,org.eclipse.equinox.ds.source,1.1.1.R35x_v20090806 No repository found containing: osgi.bundle,org.eclipse.equinox.frameworkadmin.equinox.source,1.0.100.v20090520-1905 No repository found containing: osgi.bundle,org.eclipse.equinox.frameworkadmin.source,1.0.100.v20090520-1905 No repository found containing: osgi.bundle,org.eclipse.equinox.http.jetty.source,2.0.0.v20090520-1800 No repository found containing: osgi.bundle,org.eclipse.equinox.http.registry.source,1.0.200.v20090520-1800 No repository found containing: osgi.bundle,org.eclipse.equinox.http.servlet.source,1.0.200.v20090520-1800 No repository found containing: osgi.bundle,org.eclipse.equinox.jsp.jasper.registry.source,1.0.100.v20090520-1800 No repository found containing: osgi.bundle,org.eclipse.equinox.jsp.jasper.source,1.0.200.v20090520-1800 No repository found containing: osgi.bundle,org.eclipse.equinox.launcher.source,1.0.201.R35x_v20090715 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.artifact.repository.source,1.0.101.R35x_v20090721 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.console.source,1.0.100.v20090520-1905 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.core.source,1.0.101.R35x_v20090819 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.director.app.source,1.0.100.v20090521-1912 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.director.source,1.0.100.v20090520-1905 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.directorywatcher.source,1.0.100.v20090525 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.engine.source,1.0.101.R35x_v20090825 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.exemplarysetup.source,1.0.100.v20090520-1905 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.extensionlocation.source,1.0.100.v20090520-1905 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.garbagecollector.source,1.0.100.v20090520-1905 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.jarprocessor.source,1.0.100.v20090520-1905 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.metadata.generator.source,1.0.100.v20090520-1905 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.metadata.repository.source,1.0.101.R35x_v20090812 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.metadata.source,1.0.100.v20090525 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.publisher.source,1.0.0.v20090527-1812 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.reconciler.dropins.source,1.0.100.v20090520-1905 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.repository.source,1.0.1.v20090901-1041 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.repository.tools.source,1.0.1.R35x_v20090806 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.touchpoint.eclipse.source,1.0.101.R35x_20090820-1821 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.touchpoint.natives.source,1.0.101.R35x_v20090806 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.ui.sdk.scheduler.source,1.0.0.v20090520-1905 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.ui.sdk.source,1.0.100.v20090520-1905 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.ui.source,1.0.101.R35x_v20090819 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.updatechecker.source,1.1.0.v20090520-1905 No repository found containing: osgi.bundle,org.eclipse.equinox.p2.updatesite.source,1.0.100.v20090525 No repository found containing: org.eclipse.update.feature,org.eclipse.equinox.p2.user.ui,1.1.1.R35x_v20090811-7u6FbEFYXk1qWdbS0gnpRg2932 No repository found containing: org.eclipse.update.feature,org.eclipse.equinox.p2.user.ui.source,1.1.1.R35x_v20090811-7u6FbEFYXk1qWdbS0gnpRg2932 No repository found containing: osgi.bundle,org.eclipse.equinox.preferences.source,3.2.300.v20090520-1800 No repository found containing: osgi.bundle,org.eclipse.equinox.registry.source,3.4.100.v20090520-1800 No repository found containing: osgi.bundle,org.eclipse.equinox.security.source,1.0.100.v20090520-1800 No repository found containing: osgi.bundle,org.eclipse.equinox.security.ui.source,1.0.100.v20090520-1800 No repository found containing: osgi.bundle,org.eclipse.equinox.simpleconfigurator.manipulator.source,1.0.100.v20090520-1905 No repository found containing: osgi.bundle,org.eclipse.equinox.simpleconfigurator.source,1.0.101.R35x_v20090807-1100 No repository found containing: osgi.bundle,org.eclipse.equinox.util.source,1.0.100.v20090520-1800 No repository found containing: osgi.bundle,org.eclipse.help.appserver.source,3.1.400.v20090429_1800 No repository found containing: osgi.bundle,org.eclipse.help.base.source,3.4.0.v20090526 No repository found containing: org.eclipse.update.feature,org.eclipse.help,1.1.1.R35x_v20090811-7e7eFAnFEx2XZoYwvOe8duD No repository found containing: osgi.bundle,org.eclipse.help.source,3.4.1.v20090805_35x No repository found containing: org.eclipse.update.feature,org.eclipse.help.source,1.1.1.R35x_v20090811-7e7eFAnFEx2XZoYwvOe8duD No repository found containing: osgi.bundle,org.eclipse.help.ui.source,3.4.1.v20090819_35x No repository found containing: osgi.bundle,org.eclipse.help.webapp.source,3.4.1.v20090819_35x No repository found containing: osgi.bundle,org.eclipse.jdt.apt.core.source,3.3.201.R35x_v20090818-0235 No repository found containing: osgi.bundle,org.eclipse.jdt.apt.pluggable.core.source,1.0.201.R35x_v20090818-0225 No repository found containing: osgi.bundle,org.eclipse.jdt.apt.ui.source,3.3.200.v20090528-1135 No repository found containing: osgi.bundle,org.eclipse.jdt.compiler.apt.source,1.0.201.R35x_v20090825-1530 No repository found containing: osgi.bundle,org.eclipse.jdt.compiler.tool.source,1.0.100.v_972_R35x No repository found containing: osgi.bundle,org.eclipse.jdt.core.manipulation.source,1.3.0.v20090603 No repository found containing: osgi.bundle,org.eclipse.jdt.core.source,3.5.1.v_972_R35x No repository found containing: osgi.bundle,org.eclipse.jdt.debug.source,3.5.0.v20090526 No repository found containing: osgi.bundle,org.eclipse.jdt.debug.ui.source,3.4.1.v20090811_r351 No repository found containing: osgi.bundle,org.eclipse.jdt.junit.runtime.source,3.4.100.v20090513-2000 No repository found containing: osgi.bundle,org.eclipse.jdt.junit.source,3.5.1.r351_v20090708-0800 No repository found containing: osgi.bundle,org.eclipse.jdt.junit4.runtime.source,1.1.0.v20090513-2000 No repository found containing: osgi.bundle,org.eclipse.jdt.launching.source,3.5.0.v20090527 No repository found containing: osgi.bundle,org.eclipse.jdt.source,3.5.1.r351_v20090810-0600 No repository found containing: org.eclipse.update.feature,org.eclipse.jdt.source,3.5.1.r351_v20090810-0600-7r88FEoFHxXYpY3s0jOJPn58EpLN No repository found containing: osgi.bundle,org.eclipse.jdt.ui.source,3.5.1.r351_v20090821-0800 No repository found containing: osgi.bundle,org.eclipse.jface.databinding.source,1.3.1.M20090826-0800 No repository found containing: osgi.bundle,org.eclipse.jface.source,3.5.1.M20090826-0800 No repository found containing: osgi.bundle,org.eclipse.jface.text.source,3.5.1.r351_v20090708-0800 No repository found containing: osgi.bundle,org.eclipse.jsch.core.source,1.1.100.I20090430-0408 No repository found containing: osgi.bundle,org.eclipse.jsch.ui.source,1.1.200.I20090430-0408 No repository found containing: osgi.bundle,org.eclipse.ltk.core.refactoring.source,3.5.0.v20090513-2000 No repository found containing: osgi.bundle,org.eclipse.ltk.ui.refactoring.source,3.4.100.v20090604 No repository found containing: osgi.bundle,org.eclipse.osgi.services.source,3.2.0.v20090520-1800 No repository found containing: osgi.bundle,org.eclipse.osgi.source,3.5.1.R35x_v20090827 No repository found containing: osgi.bundle,org.eclipse.osgi.util.source,3.2.0.v20090520-1800 No repository found containing: osgi.bundle,org.eclipse.pde.api.tools.source,1.0.101.v20090714 No repository found containing: osgi.bundle,org.eclipse.pde.api.tools.ui.source,1.0.101.v20090820 No repository found containing: osgi.bundle,org.eclipse.pde.build.source,3.5.1.R35x_20090820 No repository found containing: osgi.bundle,org.eclipse.pde.core.source,3.5.100.v20090821 No repository found containing: osgi.bundle,org.eclipse.pde.ds.core.source,1.0.0.v20090429-1800 No repository found containing: osgi.bundle,org.eclipse.pde.ds.ui.source,1.0.0.v20090527 No repository found containing: osgi.bundle,org.eclipse.pde.junit.runtime.source,3.4.0.v20090527 No repository found containing: osgi.bundle,org.eclipse.pde.runtime.source,3.4.100.v20090731 No repository found containing: osgi.bundle,org.eclipse.pde.source,3.4.100.v20090527 No repository found containing: org.eclipse.update.feature,org.eclipse.pde.source,3.5.1.R35x_v20090811-7Z7_F9zFDX-aT6Yswh6QQ73 No repository found containing: osgi.bundle,org.eclipse.pde.ua.core.source,1.0.0.v20090429-1800 No repository found containing: osgi.bundle,org.eclipse.pde.ua.ui.source,1.0.0.v20090511 No repository found containing: osgi.bundle,org.eclipse.pde.ui.source,3.5.0.v20090821 No repository found containing: osgi.bundle,org.eclipse.pde.ui.templates.source,3.4.100.v20090527 No repository found containing: osgi.bundle,org.eclipse.platform.source,3.3.201.R35x_v20090813 No repository found containing: org.eclipse.update.feature,org.eclipse.platform.source,3.5.1.R35x_v20090910-9gEeG1_FtDlT8tHxnXfWaifOo2mSXiz-QqDGB7 No repository found containing: osgi.bundle,org.eclipse.rcp.source,3.5.0.v20090528 No repository found containing: org.eclipse.update.feature,org.eclipse.rcp.source,3.5.1.R35x_v20090811-9SA0FxVFqE70OL16SNpWaM6e7BA6 No repository found containing: osgi.bundle,org.eclipse.search.source,3.5.1.r351_v20090708-0800 No repository found containing: osgi.bundle,org.eclipse.team.core.source,3.5.0.I20090527-0620 No repository found containing: osgi.bundle,org.eclipse.team.cvs.core.source,3.3.200.I20090430-0408 No repository found containing: osgi.bundle,org.eclipse.team.cvs.ssh.source,3.2.100.I20090508-2000 No repository found containing: osgi.bundle,org.eclipse.team.cvs.ssh2.source,3.2.200.I20090508-2000 No repository found containing: osgi.bundle,org.eclipse.team.cvs.ui.source,3.3.201.R35x_v20090826-0905 No repository found containing: osgi.bundle,org.eclipse.team.ui.source,3.5.0.I20090430-0408 No repository found containing: osgi.bundle,org.eclipse.text.source,3.5.0.v20090513-2000 No repository found containing: osgi.bundle,org.eclipse.ui.browser.source,3.2.300.v20090526 No repository found containing: osgi.bundle,org.eclipse.ui.cheatsheets.source,3.3.200.v20090526 No repository found containing: osgi.bundle,org.eclipse.ui.console.source,3.4.0.v20090513 No repository found containing: osgi.bundle,org.eclipse.ui.editors.source,3.5.0.v20090527-2000 No repository found containing: osgi.bundle,org.eclipse.ui.externaltools.source,3.2.0.v20090504 No repository found containing: osgi.bundle,org.eclipse.ui.forms.source,3.4.1.v20090714_35x No repository found containing: osgi.bundle,org.eclipse.ui.ide.application.source,1.0.101.M20090826-0800 No repository found containing: osgi.bundle,org.eclipse.ui.ide.source,3.5.1.M20090826-0800 No repository found containing: osgi.bundle,org.eclipse.ui.intro.source,3.3.1.v20090805_35x No repository found containing: osgi.bundle,org.eclipse.ui.intro.universal.source,3.2.300.v20090526 No repository found containing: osgi.bundle,org.eclipse.ui.navigator.resources.source,3.4.1.M20090826-0800 No repository found containing: osgi.bundle,org.eclipse.ui.navigator.source,3.4.1.M20090911-1550 No repository found containing: osgi.bundle,org.eclipse.ui.net.source,1.2.1.r35x_20090812-1200 No repository found containing: osgi.bundle,org.eclipse.ui.presentations.r21.source,3.2.100.I20081007-0800 No repository found containing: osgi.bundle,org.eclipse.ui.source,3.5.1.M20090902-1000 No repository found containing: osgi.bundle,org.eclipse.ui.views.log.source,1.0.100.v20090731 No repository found containing: osgi.bundle,org.eclipse.ui.views.properties.tabbed.source,3.5.0.I20090429-1800 No repository found containing: osgi.bundle,org.eclipse.ui.views.source,3.4.1.M20090826-0800 No repository found containing: osgi.bundle,org.eclipse.ui.workbench.compatibility.source,3.2.0.I20090429-1800 No repository found containing: osgi.bundle,org.eclipse.ui.workbench.source,3.5.1.M20090826-0800a No repository found containing: osgi.bundle,org.eclipse.ui.workbench.texteditor.source,3.5.0.v20090603 No repository found containing: osgi.bundle,org.eclipse.update.configurator.source,3.3.0.v20090312 No repository found containing: osgi.bundle,org.eclipse.update.core.source,3.2.300.v20090525 No repository found containing: osgi.bundle,org.eclipse.update.scheduler.source,3.2.200.v20081127 No repository found containing: osgi.bundle,org.eclipse.update.ui.source,3.2.201.R35x_v20090813 No repository found containing: osgi.bundle,org.hamcrest.core.source,1.1.0.v20090501071000 No repository found containing: osgi.bundle,org.junit.source,3.8.2.v20090203-1005 No repository found containing: osgi.bundle,org.junit4.source,4.5.0.v20090824 No repository found containing: osgi.bundle,org.mortbay.jetty.server.source,6.1.15.v200905151201 No repository found containing: osgi.bundle,org.mortbay.jetty.util.source,6.1.15.v200905182336 No repository found containing: osgi.bundle,org.objectweb.asm.source,3.1.0.v200803061910 -- This installation has not been configured properly for Software Updates. https://bugs.launchpad.net/bugs/438414 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