Pierre Salagnac created SOLR-17377:
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Summary: ClusterSingleton defined in solr.xml cannot be loaded
from a module
Key: SOLR-17377
URL: https://issues.apache.org/jira/browse/SOLR-17377
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Affects Versions: 9.6, 9.5
Reporter: Pierre Salagnac
Following SOLR-17096, we can declare a custom cluster singleton in {{solr.xml}}
file.
There is an early check in class {{SolrXmlConfig}} to ensure the plugin
actually implements interface {{{}ClusterSingleton{}}}. This check is broken
for modules and fails for any class which is defined as an external plugin, and
not in the Solr code itself because of a {{{}ClassNotFoundException{}}}.
My understanding is at this point, we don't have the _extended_ class loader
that includes plugins yet.
{code:java}
org.apache.solr.common.SolrException: Error loading class 'my.package.MyClass'
at
org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:550)
at
org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:471)
at
org.apache.solr.core.SolrXmlConfig.lambda$getClusterSingletonPluginInfos$10(Unknown
Source)
at java.base/java.util.ArrayList.forEach(ArrayList.java:1541)
at
org.apache.solr.core.SolrXmlConfig.getClusterSingletonPluginInfos(SolrXmlConfig.java:714)
at
org.apache.solr.core.SolrXmlConfig.getClusterPlugins(SolrXmlConfig.java:668)
...........
Caused by: java.lang.ClassNotFoundException: my.package.MyClass
at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:476)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:589)
{code}
With the code commented, the singleton is loaded with no error later. The issue
is only with this early check itself, and not when instantiating and starting
the singleton.
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