Resolve NPE / NullPointerException from FreeMarker template
Laura Li
更新
Issue
The following error is observed repeatedly in the log:
ERROR [default task-522][runtime:60] Error executing FreeMarker template
FreeMarker template error:
Java method "com.liferay.portlet.expando.model.impl.ExpandoBridgeImpl.getAttribute(String)" threw an exception when invoked on com.liferay.portlet.expando.model.impl.ExpandoBridgeImpl object "com.liferay.portlet.expando.model.impl.ExpandoBridgeImpl@321baf4e"; see cause exception in the Java stack trace.
----
FTL stack trace ("~" means nesting-related):
- Failed at: #assign googleSite = themeDisplay.get... [in template "portal-theme_SERVLET_CONTEXT_/templates/google_site.ftl" at line 2, column 1]
- Reached through: #include "${full_templates_path}/goog... [in template "portal-theme_SERVLET_CONTEXT_/templates/portal_normal.ftl" at line 24, column 11]
----
Java stack trace (for programmers):
----
freemarker.core._TemplateModelException: [... Exception message was already printed; see it above ...]
at freemarker.ext.beans._MethodUtil.newInvocationTemplateModelException(_MethodUtil.java:311)
at freemarker.ext.beans._MethodUtil.newInvocationTemplateModelException(_MethodUtil.java:284)
at freemarker.ext.beans.OverloadedMethodsModel.exec(OverloadedMethodsModel.java:68)
...
Caused by: java.lang.RuntimeException: java.lang.NullPointerException
at com.liferay.portlet.expando.model.impl.ExpandoBridgeImpl.getAttribute(ExpandoBridgeImpl.java:218)
at com.liferay.portlet.expando.model.impl.ExpandoBridgeImpl.getAttribute(ExpandoBridgeImpl.java:198)
at sun.reflect.GeneratedMethodAccessor923.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at freemarker.ext.beans.BeansWrapper.invokeMethod(BeansWrapper.java:1458)
at freemarker.ext.beans.ReflectionCallableMemberDescriptor.invokeMethod(ReflectionCallableMemberDescriptor.java:52)
at freemarker.ext.beans.MemberAndArguments.invokeMethod(MemberAndArguments.java:48)
at freemarker.ext.beans.OverloadedMethodsModel.exec(OverloadedMethodsModel.java:62)
... 187 more
Caused by: java.lang.NullPointerException
at com.liferay.portlet.expando.service.permission.ExpandoColumnPermissionImpl.contains(ExpandoColumnPermissionImpl.java:73)
at com.liferay.expando.kernel.service.permission.ExpandoColumnPermissionUtil.contains(ExpandoColumnPermissionUtil.java:57)
at com.liferay.portlet.expando.service.impl.ExpandoValueServiceImpl.getData(ExpandoValueServiceImpl.java:121)
...
