500 Internal Server Error


io.jpress.module.article.controller.ArticleCategoryController.index() : /article/category/about_dangdejianshe_zhuanti_135
java.lang.IndexOutOfBoundsException : Index: 0, Size: 0
        at java.util.ArrayList.rangeCheck(ArrayList.java:659)
        at java.util.ArrayList.get(ArrayList.java:435)
        at com.jfinal.template.expr.ast.Index.eval(Index.java:69)
        at com.jfinal.template.expr.ast.Field.eval(Field.java:56)
        at com.jfinal.template.expr.ast.Assign.assignVariable(Assign.java:102)
        at com.jfinal.template.expr.ast.Assign.eval(Assign.java:95)
        at com.jfinal.template.expr.ast.ExprList.eval(ExprList.java:101)
        at io.jboot.web.directive.base.JbootDirectiveBase.exec(JbootDirectiveBase.java:50)
        at com.jfinal.template.stat.ast.If.exec(If.java:54)
        at io.jboot.web.directive.base.JbootDirectiveBase.renderBody(JbootDirectiveBase.java:59)
        at io.jpress.module.article.directive.CategoriesDirective.onRender(CategoriesDirective.java:116)
        at io.jboot.web.directive.base.JbootDirectiveBase.exec(JbootDirectiveBase.java:51)
        at com.jfinal.template.stat.ast.If.exec(If.java:54)
        at com.jfinal.template.stat.ast.StatList.exec(StatList.java:68)
        at com.jfinal.template.Template.render(Template.java:79)
        at com.jfinal.template.Template.renderToString(Template.java:99)
        at io.jpress.web.render.TemplateRender.render(TemplateRender.java:75)
        at io.jboot.web.handler.JbootActionHandler.handle(JbootActionHandler.java:136)
        at io.jboot.web.handler.JbootHandler.doHandle(JbootHandler.java:46)
        at io.jboot.web.handler.JbootHandler.handle(JbootHandler.java:36)
        at io.jboot.web.handler.JbootFilterHandler.handle(JbootFilterHandler.java:45)
        at io.jpress.core.addon.handler.AddonHandlerProcesser$1.handle(AddonHandlerProcesser.java:38)
        at io.jpress.core.addon.handler.AddonHandlerProcesser.handle(AddonHandlerProcesser.java:32)
        at io.jpress.web.handler.JPressHandler.handle(JPressHandler.java:103)
        at io.jpress.web.sitemap.SitemapHandler.handle(SitemapHandler.java:42)
        at com.jfinal.core.JFinalFilter.doFilter(JFinalFilter.java:89)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:199)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:544)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81)
        at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:698)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:364)
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:616)
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:831)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1629)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Thread.java:855)

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