经常出现这样一个错误？

melin 2008-06-24

我通过插件写的portlet。开始环境，运行时间一长，就会出现下面这样的错误。

10:28:17,031 ERROR [jsp:52] java.lang.NullPointerException
	at com.liferay.portlet.CachePortlet._invoke(CachePortlet.java:371)
	at com.liferay.portlet.CachePortlet.render(CachePortlet.java:218)
	at org.apache.jsp.html.portal.render_005fportlet_jsp._jspService(render_005fportlet_jsp.java:1318)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654)
	at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:557)
	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:481)
	at com.liferay.portal.util.PortalUtil.renderPortlet(PortalUtil.java:1644)
	at com.liferay.portlet.layoutconfiguration.util.RuntimePortletUtil.processPortlet(RuntimePortletUtil.java:165)
	at com.liferay.portlet.layoutconfiguration.util.RuntimePortletUtil.processPortlet(RuntimePortletUtil.java:102)
	at com.liferay.portlet.layoutconfiguration.util.RuntimePortletUtil.processTemplate(RuntimePortletUtil.java:270)
	at com.liferay.portlet.layoutconfiguration.util.RuntimePortletUtil.processTemplate(RuntimePortletUtil.java:189)
	at org.apache.jsp.html.portal.layout.view.portlet_jsp._jspService(portlet_jsp.java:768)

10:28:17,125 ERROR [jsp:52] java.lang.NullPointerException
	at com.liferay.portlet.CachePortlet._invoke(CachePortlet.java:371)
	at com.liferay.portlet.CachePortlet.render(CachePortlet.java:218)
	at org.apache.jsp.html.portal.render_005fportlet_jsp._jspService(render_005fportlet_jsp.java:1318)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:393)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:654)
	at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:557)
	at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:481)
	at com.liferay.portal.util.PortalUtil.renderPortlet(PortalUtil.java:1644)
	at com.liferay.portlet.layoutconfiguration.util.RuntimePortletUtil.processPortlet(RuntimePortletUtil.java:165)
	at com.liferay.portlet.layoutconfiguration.util.RuntimePortletUtil.processPortlet(RuntimePortletUtil.java:102)
	at com.liferay.portlet.layoutconfiguration.util.RuntimePortletUtil.processTemplate(RuntimePortletUtil.java:270)
	at com.liferay.portlet.layoutconfiguration.util.RuntimePortletUtil.processTemplate(RuntimePortletUtil.java:189)
	at org.apache.jsp.html.portal.layout.view.portlet_jsp._jspService(portlet_jsp.java:768)

enjoyxiao 2008-06-27

应该是JSP页面有错误。

kumoon 2010-11-11

表layout的typesetting字段插入了错误的内容，多了一个或者多个逗号。可以通过修改页面预防此错误

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经常出现这样一个错误？

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