AEM ACS Commons Generic List editor breaks when more than 8 items are added

Question

ACS Commons version 5.0.6
AEM version 6.5.8.0

I am attempting to edit a Generic List in http://localhost:4502/generic-lists.html/etc/acs-commons/lists by clicking the thumbnail and then clicking the "Properties" in the top action bar. This brings me to http://localhost:4502/mnt/overlay/acs-commons/components/utilities/genericlist.html?item=/etc/acs-commons/lists/[path-to-list]. When there are 8 or fewer items already configured in the generic list, the editor page loads as expected and I can update the list. When there are greater than 8 items, a blank page is loaded and I get the following stack trace in my error log:

20.07.2021 15:01:56.223 *INFO* [sling-threadpool-26a55c4e-0bfd-42ac-ba57-0ef069a1e5f3-(apache-sling-job-thread-pool)-4-com_day_cq_replication_job_publish(com/day/cq/replication/job/publish)] com.day.cq.replication.Agent.publish.queue Job for agent publish processed in 2036ms. Failed.
    at org.apache.sling.scripting.jsp.taglib.AbstractDispatcherTagHandler.doEndTag(AbstractDispatcherTagHandler.java:128) [org.apache.sling.scripting.jsp.taglib:2.4.0]
    at org.apache.jsp.libs.granite.ui.components.coral.foundation.form.form_jsp._jspService(form_jsp.java:279)
    at org.apache.sling.scripting.jsp.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) [org.apache.sling.scripting.jsp:2.3.6]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:725) [org.apache.felix.http.servlet-api:1.1.2]
    at org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:502) [org.apache.sling.scripting.jsp:2.3.6]
    ... 283 common frames omitted
Caused by: java.lang.NullPointerException: null
    at org.apache.sling.rewriter.impl.ProcessorConfigurationImpl.match(ProcessorConfigurationImpl.java:465) [org.apache.sling.rewriter:1.2.2]
    at org.apache.sling.rewriter.impl.RewriterResponse.getProcessor(RewriterResponse.java:170) [org.apache.sling.rewriter:1.2.2]
    at org.apache.sling.rewriter.impl.RewriterResponse.getWriter(RewriterResponse.java:110) [org.apache.sling.rewriter:1.2.2]
    at org.apache.sling.scripting.core.impl.helper.OnDemandWriter.getWriter(OnDemandWriter.java:38) [org.apache.sling.scripting.core:2.3.2]
    at org.apache.sling.scripting.core.impl.helper.OnDemandWriter.write(OnDemandWriter.java:61) [org.apache.sling.scripting.core:2.3.2]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.core.impl.helper.OnDemandWriter.write(OnDemandWriter.java:61) [org.apache.sling.scripting.core:2.3.2]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.jsp.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:119) [org.apache.sling.scripting.jsp:2.3.6]
    at org.apache.sling.scripting.jsp.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:273) [org.apache.sling.scripting.jsp:2.3.6]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.core.impl.helper.OnDemandWriter.write(OnDemandWriter.java:61) [org.apache.sling.scripting.core:2.3.2]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.jsp.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:277) [org.apache.sling.scripting.jsp:2.3.6]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.core.impl.helper.OnDemandWriter.write(OnDemandWriter.java:61) [org.apache.sling.scripting.core:2.3.2]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.jsp.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:277) 
[...]
    ... 319 common frames omitted
20.07.2021 15:02:06.105 *ERROR* [[0:0:0:0:0:0:0:1] [1626807726050] GET /mnt/overlay/acs-commons/components/utilities/genericlist.html HTTP/1.1] org.apache.sling.engine.impl.SlingRequestProcessorImpl service: Uncaught SlingException
java.lang.NullPointerException: null
    at org.apache.sling.rewriter.impl.ProcessorConfigurationImpl.match(ProcessorConfigurationImpl.java:465) [org.apache.sling.rewriter:1.2.2]
    at org.apache.sling.rewriter.impl.RewriterResponse.getProcessor(RewriterResponse.java:170) [org.apache.sling.rewriter:1.2.2]
    at org.apache.sling.rewriter.impl.RewriterResponse.getWriter(RewriterResponse.java:110) [org.apache.sling.rewriter:1.2.2]
    at org.apache.sling.scripting.core.impl.helper.OnDemandWriter.getWriter(OnDemandWriter.java:38) [org.apache.sling.scripting.core:2.3.2]
    at org.apache.sling.scripting.core.impl.helper.OnDemandWriter.write(OnDemandWriter.java:61) [org.apache.sling.scripting.core:2.3.2]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.core.impl.helper.OnDemandWriter.write(OnDemandWriter.java:61) [org.apache.sling.scripting.core:2.3.2]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.jsp.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:119) [org.apache.sling.scripting.jsp:2.3.6]
    at org.apache.sling.scripting.jsp.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:273) [org.apache.sling.scripting.jsp:2.3.6]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.core.impl.helper.OnDemandWriter.write(OnDemandWriter.java:61) [org.apache.sling.scripting.core:2.3.2]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.jsp.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:277) [org.apache.sling.scripting.jsp:2.3.6]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.core.impl.helper.OnDemandWriter.write(OnDemandWriter.java:61) [org.apache.sling.scripting.core:2.3.2]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.jsp.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:277) [org.apache.sling.scripting.jsp:2.3.6]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.core.impl.helper.OnDemandWriter.write(OnDemandWriter.java:61) [org.apache.sling.scripting.core:2.3.2]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.jsp.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:119) [org.apache.sling.scripting.jsp:2.3.6]
    at org.apache.sling.scripting.jsp.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:289) [org.apache.sling.scripting.jsp:2.3.6]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.core.impl.helper.OnDemandWriter.write(OnDemandWriter.java:61) [org.apache.sling.scripting.core:2.3.2]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.jsp.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:119) [org.apache.sling.scripting.jsp:2.3.6]
    at org.apache.sling.scripting.jsp.jasper.runtime.PageContextImpl.release(PageContextImpl.java:183) [org.apache.sling.scripting.jsp:2.3.6]
    at org.apache.sling.scripting.jsp.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:99) [org.apache.sling.scripting.jsp:2.3.6]
    at org.apache.sling.scripting.jsp.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:71) [org.apache.sling.scripting.jsp:2.3.6]
    at org.apache.sling.scripting.jsp.jasper.compiler.JspRuntimeContext$JspFactoryHandler.releasePageContext(JspRuntimeContext.java:112) [org.apache.sling.scripting.jsp:2.3.6]
    at org.apache.jsp.libs.granite.ui.components.coral.foundation.form.fieldset.fieldset_jsp._jspService(fieldset_jsp.java:189)
    at org.apache.sling.scripting.jsp.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) [org.apache.sling.scripting.jsp:2.3.6]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:725) [org.apache.felix.http.servlet-api:1.1.2]
    at org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:502) [org.apache.sling.scripting.jsp:2.3.6]
    at org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:449) [org.apache.sling.scripting.jsp:2.3.6]
    at org.apache.sling.scripting.jsp.JspScriptEngineFactory.callJsp(JspScriptEngineFactory.java:339) [org.apache.sling.scripting.jsp:2.3.6]
    at org.apache.sling.scripting.jsp.JspScriptEngineFactory.access$100(JspScriptEngineFactory.java:97) [org.apache.sling.scripting.jsp:2.3.6]
    at org.apache.sling.scripting.jsp.JspScriptEngineFactory$JspScriptEngine.eval(JspScriptEngineFactory.java:600) [org.apache.sling.scripting.jsp:2.3.6]
    at org.apache.sling.scripting.core.impl.DefaultSlingScript.call(DefaultSlingScript.java:388) [org.apache.sling.scripting.core:2.3.2]
    at org.apache.sling.scripting.core.impl.DefaultSlingScript.eval(DefaultSlingScript.java:184) [org.apache.sling.scripting.core:2.3.2]
    at org.apache.sling.scripting.core.impl.DefaultSlingScript.service(DefaultSlingScript.java:491) [org.apache.sling.scripting.core:2.3.2]
    at org.apache.sling.engine.impl.request.RequestData.service(RequestData.java:552) [org.apache.sling.engine:2.7.2]
    at org.apache.sling.engine.impl.filter.SlingComponentFilterChain.render(SlingComponentFilterChain.java:44) [org.apache.sling.engine:2.7.2]
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:82) [org.apache.sling.engine:2.7.2]
    at com.day.cq.wcm.core.impl.WCMDeveloperModeFilter.doFilter(WCMDeveloperModeFilter.java:119) [com.day.cq.wcm.cq-wcm-core:5.12.158]
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:72) [org.apache.sling.engine:2.7.2]
    at com.day.cq.wcm.core.impl.WCMDebugFilter.doFilter(WCMDebugFilter.java:156) [com.day.cq.wcm.cq-wcm-core:5.12.158]
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:72) [org.apache.sling.engine:2.7.2]
    at com.adobe.acs.commons.granite.ui.components.impl.include.IncludeDecoratorFilterImpl.doFilter(IncludeDecoratorFilterImpl.java:92) [com.adobe.acs.acs-aem-commons-bundle:5.0.6]
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:72) [org.apache.sling.engine:2.7.2]
    at com.day.cq.wcm.core.impl.WCMComponentFilter.filterRootInclude(WCMComponentFilter.java:375) [com.day.cq.wcm.cq-wcm-core:5.12.158]
    at com.day.cq.wcm.core.impl.WCMComponentFilter.doFilter(WCMComponentFilter.java:190) [com.day.cq.wcm.cq-wcm-core:5.12.158]
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:72) [org.apache.sling.engine:2.7.2]
    at com.day.cq.wcm.core.impl.page.PageLockFilter.doFilter(PageLockFilter.java:91) [com.day.cq.wcm.cq-wcm-core:5.12.158]
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:72) [org.apache.sling.engine:2.7.2]
    at com.day.cq.personalization.impl.TargetComponentFilter.doFilter(TargetComponentFilter.java:94) [com.day.cq.cq-personalization:5.12.44]
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:72) [org.apache.sling.engine:2.7.2]
    at com.adobe.granite.csrf.impl.CSRFFilter.doFilter(CSRFFilter.java:217) [com.adobe.granite.csrf:1.0.20.CQ650-B0002]
    at org.apache.sling.engine.impl.filter.AbstractSlingFilterChain.doFilter(AbstractSlingFilterChain.java:72) [org.apache.sling.engine:2.7.2]
    at org.apache.sling.engine.impl.SlingRequestProcessorImpl.processComponent(SlingRequestProcessorImpl.java:283) [org.apache.sling.engine:2.7.2]
    at org.apache.sling.engine.impl.SlingRequestProcessorImpl.dispatchRequest(SlingRequestProcessorImpl.java:323) [org.apache.sling.engine:2.7.2]
    at org.apache.sling.engine.impl.request.SlingRequestDispatcher.dispatch(SlingRequestDispatcher.java:211) [org.apache.sling.engine:2.7.2]
    at org.apache.sling.engine.impl.request.SlingRequestDispatcher.include(SlingRequestDispatcher.java:104) [org.apache.sling.engine:2.7.2]
[...]
    ... 283 common frames omitted
Caused by: java.lang.NullPointerException: null
    at org.apache.sling.rewriter.impl.ProcessorConfigurationImpl.match(ProcessorConfigurationImpl.java:465) [org.apache.sling.rewriter:1.2.2]
    at org.apache.sling.rewriter.impl.RewriterResponse.getProcessor(RewriterResponse.java:170) [org.apache.sling.rewriter:1.2.2]
    at org.apache.sling.rewriter.impl.RewriterResponse.getWriter(RewriterResponse.java:110) [org.apache.sling.rewriter:1.2.2]
    at org.apache.sling.scripting.core.impl.helper.OnDemandWriter.getWriter(OnDemandWriter.java:38) [org.apache.sling.scripting.core:2.3.2]
    at org.apache.sling.scripting.core.impl.helper.OnDemandWriter.write(OnDemandWriter.java:61) [org.apache.sling.scripting.core:2.3.2]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.core.impl.helper.OnDemandWriter.write(OnDemandWriter.java:61) [org.apache.sling.scripting.core:2.3.2]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.jsp.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:119) [org.apache.sling.scripting.jsp:2.3.6]
    at org.apache.sling.scripting.jsp.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:273) [org.apache.sling.scripting.jsp:2.3.6]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.core.impl.helper.OnDemandWriter.write(OnDemandWriter.java:61) [org.apache.sling.scripting.core:2.3.2]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.jsp.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:277) [org.apache.sling.scripting.jsp:2.3.6]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.core.impl.helper.OnDemandWriter.write(OnDemandWriter.java:61) [org.apache.sling.scripting.core:2.3.2]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.jsp.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:277) [org.apache.sling.scripting.jsp:2.3.6]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.core.impl.helper.OnDemandWriter.write(OnDemandWriter.java:61) [org.apache.sling.scripting.core:2.3.2]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.jsp.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:119) [org.apache.sling.scripting.jsp:2.3.6]
    at org.apache.sling.scripting.jsp.jasper.runtime.JspWriterImpl.write(JspWriterImpl.java:289) [org.apache.sling.scripting.jsp:2.3.6]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.core.impl.helper.OnDemandWriter.write(OnDemandWriter.java:61) [org.apache.sling.scripting.core:2.3.2]
    at java.io.PrintWriter.write(Unknown Source)
    at org.apache.sling.scripting.jsp.jasper.runtime.JspWriterImpl.flushBuffer(JspWriterImpl.java:119) [org.apache.sling.scripting.jsp:2.3.6]
    at org.apache.sling.scripting.jsp.jasper.runtime.PageContextImpl.release(PageContextImpl.java:183) [org.apache.sling.scripting.jsp:2.3.6]
    at org.apache.sling.scripting.jsp.jasper.runtime.JspFactoryImpl.internalReleasePageContext(JspFactoryImpl.java:99) [org.apache.sling.scripting.jsp:2.3.6]
    at org.apache.sling.scripting.jsp.jasper.runtime.JspFactoryImpl.releasePageContext(JspFactoryImpl.java:71) [org.apache.sling.scripting.jsp:2.3.6]
    at org.apache.sling.scripting.jsp.jasper.compiler.JspRuntimeContext$JspFactoryHandler.releasePageContext(JspRuntimeContext.java:112) [org.apache.sling.scripting.jsp:2.3.6]
    at org.apache.jsp.libs.granite.ui.components.coral.foundation.form.fieldset.fieldset_jsp._jspService(fieldset_jsp.java:189)
    at org.apache.sling.scripting.jsp.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70) [org.apache.sling.scripting.jsp:2.3.6]
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:725) [org.apache.felix.http.servlet-api:1.1.2]
    at org.apache.sling.scripting.jsp.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:502) [org.apache.sling.scripting.jsp:2.3.6]
    ... 319 common frames omitted

Has anybody experience this issue before? The issue has been raised in GitHub for the ACS Commons project, but no solution has been discovered to my knowledge.

user_3686211 · Answer

As per my experience this issue happens due to rewriter configurations . Please try removing /apps/myapp/config/rewriter and check if it works fine.

user_5127050 · Answer

Issue: acs commons generic lists with more than 8 items gives 500.

I am able to reproduce the issue with latest acs-commons 5.3.2 on latest AEM 6.5.13 having /apps/project/config/rewriter.

As suggested by Kumar Ashish Ranjan, first tried removing rewriter node in /apps/project/config/rewriter helped.

Fix: update node property order="-1" from its current value order="10" in /apps/project/config/rewriter/ as per the latest /libs/cq/config/rewriter/default order="-1"

Note: 4.3.2 is a working version of acs-commons which supports classic and does not has this generic-lists issue.

Hope it helps!

Thanks

AEM ACS Commons Generic List editor breaks when more than 8 items are added

2 Answers