Symptoms
After installing OA hotfixes, Control Panel becomes unavailable, UI service is stopped on the corresponding UI node:
# service pau status
pau is stopped
/var/log/pa/console.log on the UI node contains messages indicating an Out-of-memory condition:
170626 06:45:55 WARN [org.jboss.modules] (Weld Thread Pool -- 2) Failed to define class com.plesk.p2.cp.core.aps.modules.screens.ApplicationPropsMult$3 in Module "deployment.pui-war.war:main" from Service Module Loader: java.lang.OutOfMemoryError: Metaspace
at java.lang.ClassLoader.defineClass1(Native Method) [rt.jar:1.8.0_112]
at java.lang.ClassLoader.defineClass(ClassLoader.java:763) [rt.jar:1.8.0_112]
at org.jboss.modules.ModuleClassLoader.doDefineOrLoadClass(ModuleClassLoader.java:358) [jboss-modules.jar:1.5.2.Final]
at org.jboss.modules.ModuleClassLoader.defineClass(ModuleClassLoader.java:437) [jboss-modules.jar:1.5.2.Final]
at org.jboss.modules.ModuleClassLoader.loadClassLocal(ModuleClassLoader.java:274) [jboss-modules.jar:1.5.2.Final]
Cause
The behavior is acknowledged as POA-111861 (Java metaspace OOM on PUI redeployment)
Resolution
Start the service back:
# service pau start
Log in to the Control Panel and run the pending Reloading PUI application on host task.