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java.lang.StackOverflowError: 	at java.lang.ClassLoader.findBootstrapClass(Native Method)	at java.lang.ClassLoader.findBootstrapClass0(ClassLoader.java:891)	at java.lang.ClassLoader.loadClass(ClassLoader.java:301)	at java.lang.ClassLoader.loadClass(ClassLoader.java:299)	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:276)	at java.lang.ClassLoader.loadClass(ClassLoader.java:251)	at java.net.URL.getURLStreamHandler(URL.java:1143)	at java.net.URL.(URL.java:572)	at java.net.URL.(URL.java:464)	at java.net.URL.(URL.java:413)	at com.xpn.xwiki.web.XWikiServletURLFactory.getServerURL(XWikiServletURLFactory.java:150)	at com.xpn.xwiki.web.XWikiServletURLFactory.getServerURL(XWikiServletURLFactory.java:137)	at com.xpn.xwiki.web.XWikiServletURLFactory.createSkinURL(XWikiServletURLFactory.java:284)	at com.xpn.xwiki.XWiki.getSkinFile(XWiki.java:1690)	at com.xpn.xwiki.XWiki.getSkinFile(XWiki.java:1652)	at com.xpn.xwiki.render.XWikiVelocityRenderer.getVelocityEngineCacheKey(XWikiVelocityRenderer.java:115)	at com.xpn.xwiki.render.XWikiVelocityRenderer.getVelocityEngineCacheKey(XWikiVelocityRenderer.java:130)	at com.xpn.xwiki.render.XWikiVelocityRenderer.getVelocityEngineCacheKey(XWikiVelocityRenderer.java:130)	at com.xpn.xwiki.render.XWikiVelocityRenderer.getVelocityEngineCacheKey(XWikiVelocityRenderer.java:130)	at com.xpn.xwiki.render.XWikiVelocityRenderer.getVelocityEngineCacheKey(XWikiVelocityRenderer.java:130)	at com.xpn.xwiki.render.XWikiVelocityRenderer.getVelocityEngineCacheKey(XWikiVelocityRenderer.java:130)	at com.xpn.xwiki.render.XWikiVelocityRenderer.getVelocityEngineCacheKey(XWikiVelocityRenderer.java:130)	at com.xpn.xwiki.render.XWikiVelocityRenderer.getVelocityEngineCacheKey(XWikiVelocityRenderer.java:130)	at com.xpn.xwiki.render.XWikiVelocityRenderer.getVelocityEngineCacheKey(XWikiVelocityRenderer.java:130)