Heavy encoding Problems

As it seems Workspace Encoding interferes with WIKI-Encoding.

I guess there is no BOM. It does not work with any encoding. However on the Eclipse Resource (Properties), the Resource Page is missing.

eclipse.buildId=unknown
java.version=1.6.0_32
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=de_CH
Command-line arguments: -os win32 -ws win32 -arch x86

Error
Wed Sep 12 17:45:30 CEST 2012
An internal error occurred during: "Fetching children of XXX".

com.thoughtworks.xstream.io.StreamException: : Invalid byte 1 of 1-byte UTF-8 sequence.
at com.thoughtworks.xstream.io.xml.DomDriver.createReader(DomDriver.java:88)
at com.thoughtworks.xstream.io.xml.DomDriver.createReader(DomDriver.java:70)
at com.thoughtworks.xstream.XStream.fromXML(XStream.java:869)
at org.xwiki.eclipse.core.utils.CoreUtils.readDataFromXML(Unknown Source)
at org.xwiki.eclipse.core.storage.LocalXWikiDataStorage.getPages(Unknown Source)
at org.xwiki.eclipse.core.DataManager.getPages(Unknown Source)
at org.xwiki.eclipse.ui.adapters.XWikiEclipseSpaceSummaryAdapter.getChildren(Unknown Source)
at org.xwiki.eclipse.ui.adapters.XWikiEclipseSpaceSummaryAdapter.fetchDeferredChildren(Unknown Source)
at org.eclipse.ui.progress.DeferredTreeContentManager$1.run(DeferredTreeContentManager.java:234)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
Caused by: com.sun.org.apache.xerces.internal.impl.io.MalformedByteSequenceException: Invalid byte 1 of 1-byte UTF-8 sequence.
at com.sun.org.apache.xerces.internal.impl.io.UTF8Reader.invalidByte(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.io.UTF8Reader.read(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.load(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.skipChar(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(Unknown Source)
at com.thoughtworks.xstream.io.xml.DomDriver.createReader(DomDriver.java:79)
... 9 more