Since Sitecore 9 was released a few weeks back, I’ve been digging into the new release and there are lots of new things to play with. One of the most interesting new features is xConnect, a framework of rich APIs and services that allows users to integrate customer interaction data collected by Sitecore with customer data from nearly any third-party system or channel.

xConnect brings with it a separately hosted IIS site, additional Solr cores and a couple of other applications more details are available in the Developer Center.

The release of Sitecore 9 also brought a new way to install Sitecore the Sitecore Installation Framework (SIF), you can read more about that in the installation guide.

After installing Sitecore 9 locally using SIF, I wanted to make changes to the connection strings used in the installation rather than using a sql user I wanted to use the App Pool user so I removed the user id and password and added Trusted_Connection=True;

This change ended up breaking my Solr core for xDB called {siteprefix}_xdb, the logs pointed to a Solr error and opening Solr showed the message :-

SolrCore Initialization Failures 
{siteprefix}_xdb: org.apache.solr.common.SolrException:org.apache.solr.common.SolrException: Error opening new searcher 
Please check your logs for more information

So I checked my Solr logs – https://localhost:8983/solr/#/~logging and found some more details on the error.


The stack trace was

null:org.apache.solr.common.SolrException: Unable to create core [{SitePrefix}_xdb] at org.apache.solr.core.CoreContainer.createFromDescriptor(
at org.apache.solr.core.CoreContainer.getCore(
at org.apache.solr.servlet.HttpSolrCall.init(
at org.apache.solr.servlet.SolrDispatchFilter.doFilter(
at org.apache.solr.servlet.SolrDispatchFilter.doFilter(


Caused by: java.nio.file.FileAlreadyExistsException: C:\solr\server\solr\{SitePrefix}_xdb\data\index\write.lock
at java.base/sun.nio.fs.WindowsException.translateToIOException(Unknown Source)
at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(Unknown Source)
at java.base/sun.nio.fs.WindowsException.rethrowAsIOException(Unknown Source)
at java.base/sun.nio.fs.WindowsFileSystemProvider.newByteChannel(Unknown Source)
at java.base/java.nio.file.Files.newByteChannel(Unknown Source)
at java.base/java.nio.file.Files.createFile(Unknown Source)


The stack trace was pretty explicit Caused by: java.nio.file.FileAlreadyExistsException: C:\solr\server\solr\{SitePrefix}_xdb\data\index\write.lock although I was not sure why they write.lock file was present. So I deleted the file and restarted my Solr service and the write.lock came back and the xDB core failed to start again.


After some digging I found a config file I had missed out on updating for the Sitecore XConnect Search Indexer service, the config file was here for my install


Once I updated the collection connectionstring

<add name="collection" connectionString="data source=(local);Initial Catalog={siteprefix}_Xdb.Collection.ShardMapManager;Trusted_Connection=True;" />

  • Restart the xConnect site: {siteprefix}.xconnect
  • Restart the Sitecore XConnect Search Indexer windows service
  • Deleted the log write.lock file from the the {siteprefix}_xdb and {siteprefix}_xdb_rebuild cores data directories
  • Restarted my Solr service

After this everything was happy and my Solr cores came back online.

The last step is manaully triggering a rebuild of the xDB core via the service with the command XConnectSearchIndexer -rr documented here – and you should get a success message from the service.







2 thoughts on “SolrCore Initialization Failures – xConnect Sitecore 9

  1. Good stuff Wesley

    I had the same error but hadn’t changed connections strings.

    The key to this solution is just restarting the xConnect site in IIS with the steps you outlined above (which you effectively did by editing you config file)

    so the process is actually
    – restart the IIS site: {siteprefix}.xconnect
    – restart the service: Sitecore XConnect Search Indexer
    – delete write.lock file from the folders: {siteprefix}_xdb and {siteprefix}_xdb_rebuild
    – restart Solr service
    – rebuild xconnect search: C:\inetpub\wwwroot\{siteprefix}.xconnect\App_data\jobs\continuous\IndexWorker\XConnectSearchIndexer.exe -rr

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