Details
Minor Description
After startup of the servlet container when sending the first request to initialize the wiki, the following exception shows up in the log of my production server:
[2020-11-27 00:15:06] [info] 2020-11-27 00:15:06,298 [extendion.index job group daemon thread - org.xwiki.extension.index.internal.job.ExtensionIndexJob@6c3afd53([extension, index])] ERROR o.x.e.i.i.j.ExtensionIndexJob - Exception thrown during job execution [2020-11-27 00:15:06] [info] java.lang.NullPointerException: null [2020-11-27 00:15:06] [info] #011at org.xwiki.extension.internal.converter.ExtensionAuthorConverter.toString(ExtensionAuthorConverter.java:152) [2020-11-27 00:15:06] [info] #011at org.xwiki.extension.internal.converter.ExtensionAuthorConverter.convertToString(ExtensionAuthorConverter.java:186) [2020-11-27 00:15:06] [info] #011at org.xwiki.extension.internal.converter.ExtensionAuthorConverter.convertToString(ExtensionAuthorConverter.java:43) [2020-11-27 00:15:06] [info] #011at org.xwiki.properties.converter.AbstractConverter.convert(AbstractConverter.java:46) [2020-11-27 00:15:06] [info] #011at org.xwiki.search.solr.internal.DefaultSolrUtils.toString(DefaultSolrUtils.java:416) [2020-11-27 00:15:06] [info] #011at org.xwiki.search.solr.internal.DefaultSolrUtils.lambda$setString$2(DefaultSolrUtils.java:396) [2020-11-27 00:15:06] [info] #011at java.base/java.util.ArrayList.forEach(ArrayList.java:1541) [2020-11-27 00:15:06] [info] #011at java.base/java.util.Collections$UnmodifiableCollection.forEach(Collections.java:1085) [2020-11-27 00:15:06] [info] #011at org.xwiki.search.solr.internal.DefaultSolrUtils.setString(DefaultSolrUtils.java:396) [2020-11-27 00:15:06] [info] #011at org.xwiki.extension.index.internal.ExtensionIndexStore.add(ExtensionIndexStore.java:450) [2020-11-27 00:15:06] [info] #011at org.xwiki.extension.index.internal.job.ExtensionIndexJob.addLocalExtensions(ExtensionIndexJob.java:580) [2020-11-27 00:15:06] [info] #011at org.xwiki.extension.index.internal.job.ExtensionIndexJob.runInternal(ExtensionIndexJob.java:202) [2020-11-27 00:15:06] [info] #011at org.xwiki.job.AbstractJob.runInContext(AbstractJob.java:243) [2020-11-27 00:15:06] [info] #011at org.xwiki.job.AbstractJob.run(AbstractJob.java:220) [2020-11-27 00:15:06] [info] #011at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) [2020-11-27 00:15:06] [info] #011at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) [2020-11-27 00:15:06] [info] #011at java.base/java.lang.Thread.run(Thread.java:834)
The link in question is:
builder.append(value.getName().replace("\\", "\\\\").replace("/", "\\/"));
Obviously value.getName() (or just value) is null here.
This exception is not reproducible with a vanilla jetty-hsqldb instance so it seems to be caused by some broken extension in my local repository. Me bad! A better error message would be nice, however.