Solr on JBoss/WildFly connecting to SolrCloud throws NoClassDefFoundError for log4j

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.0.0 DXP FP49, 7.0.X
• Fix Version/s: 7.0.X, 7.1.X, Master
• Component/s: Search Infrastructure > Solr Connector
• Labels:
  • ee-ts
  • marketplace-portal-search-solr-1.1.1-7010
• Branch Version/s:
  7.1.x, 7.0.x
• Backported to Branch:
  Committed
• Epic/Theme:
  • Solr-7.x
• Fix Priority: 4
• Application Servers:
  Wildfly 11.0
• Sprint: Search | S02 Sprint 7
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/65331

Steps to reproduce:

1. Set up a JBoss EAP/WildFly with Liferay
2. Set up a SolrCloud per this documentation: https://dev.liferay.com/discover/deployment/-/knowledge_base/7-0/using-solr
3. Configure Liferay to connect to SolrCloud as per above documentation
   1.  Reproduced with both Solr 5.5.5 and Solr 7.2.1 and Liferay Solr 5 Search Engine 1.0.1 (for 7.0) and Liferay deployed to WildFily 11
   2. Attached configs for elasticsearch blacklist and solr configs
4. Start Liferay

Observed result: continued logging - solr5:

2018-06-07 15:55:39.834 WARN  [liferay/search_writer/SYSTEM_ENGINE-4-SendThread(localhost:9983)][ClientCnxn:1162] Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect
java.lang.NoClassDefFoundError: org/apache/log4j/Logger
	at org.apache.zookeeper.Login.<init>(Login.java:44)
	at org.apache.zookeeper.client.ZooKeeperSaslClient.createSaslClient(ZooKeeperSaslClient.java:226)
	at org.apache.zookeeper.client.ZooKeeperSaslClient.<init>(ZooKeeperSaslClient.java:131)
	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1008)
	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1060)
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Logger cannot be found by com.liferay.portal.search.solr_2.0.31
	at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:444)
	at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:357)
	at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:349)
	at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:160)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 5 more

Observed result - solr7:

2018-11-13 15:31:43.222 WARN  [liferay/search_writer/SYSTEM_ENGINE-4-SendThread(localhost:9983)][ClientCnxn:1162] Session 0x0 for server null, unexpected error, closing socket connection and attempting reconnect
java.lang.NoClassDefFoundError: org/apache/log4j/Logger
	at org.apache.zookeeper.Login.<init>(Login.java:44)
	at org.apache.zookeeper.client.ZooKeeperSaslClient.createSaslClient(ZooKeeperSaslClient.java:226)
	at org.apache.zookeeper.client.ZooKeeperSaslClient.<init>(ZooKeeperSaslClient.java:131)
	at org.apache.zookeeper.ClientCnxn$SendThread.startConnect(ClientCnxn.java:1008)
	at org.apache.zookeeper.ClientCnxn$SendThread.run(ClientCnxn.java:1060)
Caused by: java.lang.ClassNotFoundException: org.apache.log4j.Logger cannot be found by com.liferay.portal.search.solr7.impl_2.0.0
	at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:508)
	at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:419)
	at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:411)
	at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:150)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
	... 5 more

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Additional information

1. Issue not reproducible on Tomcat

QA Notes

1. On master & 7.1.x, test with "/modules/apps/portal-search-solr7" module too connecting to Solr 7.2.x server.
2. On 7.0.x, use "/modules/apps/portal-search-solr"