java.lang.StringIndexOutOfBoundsException: String index out of range: -29

  java.lang.String.substring(String.java:1967)
  eu.ibacz.esf.web.portlet.extenddocumentlibrary.ExtendDocumentLibraryViewController.getFolder(ExtendDocumentLibraryViewController.java:312)
  eu.ibacz.esf.web.portlet.extenddocumentlibrary.ExtendDocumentLibraryViewController.loadFileEntryPtos(ExtendDocumentLibraryViewController.java:274)
  eu.ibacz.esf.web.portlet.extenddocumentlibrary.ExtendDocumentLibraryViewController.doView(ExtendDocumentLibraryViewController.java:119)
  sun.reflect.GeneratedMethodAccessor3385.invoke(Unknown Source)
  sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  java.lang.reflect.Method.invoke(Method.java:498)
  org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:181)
  org.springframework.web.portlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:367)
  org.springframework.web.portlet.mvc.annotation.AnnotationMethodHandlerAdapter.doHandle(AnnotationMethodHandlerAdapter.java:354)
  org.springframework.web.portlet.mvc.annotation.AnnotationMethodHandlerAdapter.handleRender(AnnotationMethodHandlerAdapter.java:294)
  org.springframework.web.portlet.DispatcherPortlet.doRenderService(DispatcherPortlet.java:764)
  org.springframework.web.portlet.FrameworkPortlet.processRequest(FrameworkPortlet.java:537)
  org.springframework.web.portlet.FrameworkPortlet.doDispatch(FrameworkPortlet.java:483)
  javax.portlet.GenericPortlet.render(GenericPortlet.java:233)
  com.liferay.portlet.FilterChainImpl.doFilter(FilterChainImpl.java:103)
  com.liferay.portlet.ScriptDataPortletFilter.doFilter(ScriptDataPortletFilter.java:55)
  com.liferay.portlet.FilterChainImpl.doFilter(FilterChainImpl.java:100)
  com.liferay.portal.kernel.portlet.PortletFilterUtil.doFilter(PortletFilterUtil.java:64)
  com.liferay.portal.kernel.servlet.PortletServlet.service(PortletServlet.java:112)
  javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
  org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
  org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
  com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilterChain.doFilter(InvokerFilterChain.java:116)
  com.liferay.portal.kernel.servlet.filters.invoker.InvokerFilter.doFilter(InvokerFilter.java:119)
  org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
  org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
  org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:749)
  org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:605)
  org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:544)
  ... and more ...