java.lang.ClassCastException: com.liferay.portal.kernel.servlet.NonSerializ https://liferay.dev/c/message_boards/find_thread?p_l_id=119785294&threadId=113276222 2026-04-04T21:41:05Z 2026-04-04T21:41:05Z Andrew Jardine https://liferay.dev/c/message_boards/find_message?p_l_id=119785294&messageId=113289731 2019-04-19T00:53:17Z 2019-04-19T00:53:17Z

Hi John,<br /><br />If you have a DXP license I would definitely open a LESA ticket to see if Liferay knows about the issue. If they don&#39;t then they would at least be able to help you troubleshoot -- support is part of your licensing, so might as well leverage it!<br /><br />I&#39;m willing to help if I can, though I don&#39;t have access to a weblogic environment so best I can offer is to ask a pile of questions and see if it triggers any ideas. The portlet you are deploying .. is it a custom portlet you have built? If yes -- what kind of portlet is it? (JSF, Spring MVC, Liferay MVC, etc)<br /><br />​​​​​​​

Andrew Jardine 2019-04-19T00:53:17Z John Joseph https://liferay.dev/c/message_boards/find_message?p_l_id=119785294&messageId=113276221 2019-04-17T20:29:37Z 2019-04-17T20:29:37Z

Hi Experts,<br /><br />I am getting the following error in liferay 7.1 DXP. The page will be blank when this error happens. The issue is completely sporadic. Is this a known issue with liferay? <br /><br />The error disappears when i redepoy the portlet. <br /><br />How do i troubleshoot and fix this?<br /><br /><br />​​​​​​​2019-03-12 19:29:53.263 ERROR [[ACTIVE] ExecuteThread: &#39;27&#39; for queue: &#39;weblogic.kernel.Default (self-tuning)&#39;][<em><strong>render_portlet_jsp:131] null </strong></em><br /><em><strong>java.lang.ClassCastException: com.liferay.portal.kernel.servlet.NonSerializableObjectHandler cannot be cast to java.lang.String </strong></em><br />at weblogic.servlet.internal.NestedServletResponse.handleResourceNotFoundFromDefaultServlet(NestedServletResponse.java:170) <br />at weblogic.servlet.internal.NestedServletResponse.sendError(NestedServletResponse.java:128) <br />at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:167) <br />at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:167) <br />at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:167) <br />at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:167) <br />at com.liferay.portal.kernel.servlet.MetaInfoCacheServletResponse.sendError(MetaInfoCacheServletResponse.java:392) <br />at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:167) <br />at com.liferay.portal.kernel.servlet.MetaInfoCacheServletResponse.sendError(MetaInfoCacheServletResponse.java:392) <br />at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:167) <br />at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:167) <br />at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:167) <br />at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:167) <br />at com.liferay.portal.kernel.servlet.MetaInfoCacheServletResponse.sendError(MetaInfoCacheServletResponse.java:392) <br />at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:167) <br />at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:167) <br />at javax.servlet.http.HttpServletResponseWrapper.sendError(HttpServletResponseWrapper.java:167) <br />at com.liferay.portal.kernel.servlet.MetaInfoCacheServletResponse.sendError(MetaInfoCacheServletResponse.java:392) <br />at weblogic.servlet.FileServlet.findSource(FileServlet.java:271) <br />at weblogic.servlet.FileServlet.doGetHeadPost(FileServlet.java:179)

John Joseph 2019-04-17T20:29:37Z