[keycloak-user] Infinispan MBean Null Pointer Exception

[Matteo Restelli]

Hi all,
We're encountering a NullPointerException during our scraping of JMX
Metrics in Keycloak. More precisely:

- We're exporting the jmx via Prometheus Exporter Agent (javaagent)
- Our additional run params are the following:
"-Djava.util.logging.manager=org.jboss.logmanager.LogManager
-Djboss.modules.system.pkgs=org.jboss.byteman,org.jboss.logmanager
-Xbootclasspath/p:/opt/jboss/keycloak/modules/system/layers/base/org/jboss/logmanager/main/jboss-logmanager-2.1.7.Final.jar
-Xbootclasspath/p:$JBOSS_HOME/modules/system/layers/base/org/wildfly/common/main/wildfly-common-1.4.0.Final.jar
-javaagent:/opt/jboss/keycloak/jmx_prometheus_javaagent.jar=18080:/home/config.yaml"

- Everytime Prometheus scrapes on the 18080 port, we encounter a lot of
Null pointer exceptions related to LockingMetric.java. See the following
error:

 12:42:08,318 ERROR [org.jboss.as.controller.management-operation]
(pool-1-thread-3) WFLYCTL0013: Operation ("read-attribute") failed -
address: ([
keycloak_1  |     ("subsystem" => "infinispan"),
keycloak_1  |     ("cache-container" => "keycloak"),
keycloak_1  |     ("local-cache" => "users"),
keycloak_1  |     ("component" => "locking")
keycloak_1  | ]): java.lang.NullPointerException
keycloak_1  | at
org.jboss.as.clustering.infinispan.subsystem.LockingMetric$1.execute(LockingMetric.java:41)
keycloak_1  | at
org.jboss.as.clustering.infinispan.subsystem.LockingMetric$1.execute(LockingMetric.java:38)
keycloak_1  | at
org.jboss.as.clustering.infinispan.subsystem.LockingMetricExecutor.execute(LockingMetricExecutor.java:46)
keycloak_1  | at
org.jboss.as.clustering.infinispan.subsystem.LockingMetricExecutor.execute(LockingMetricExecutor.java:37)
keycloak_1  | at
org.jboss.as.clustering.controller.MetricHandler.executeRuntimeStep(MetricHandler.java:75)
keycloak_1  | at
org.jboss.as.controller.AbstractRuntimeOnlyHandler$1.execute(AbstractRuntimeOnlyHandler.java:59)
keycloak_1  | at
org.jboss.as.controller.AbstractOperationContext.executeStep(AbstractOperationContext.java:999)
keycloak_1  | at
org.jboss.as.controller.AbstractOperationContext.processStages(AbstractOperationContext.java:743)
keycloak_1  | at
org.jboss.as.controller.AbstractOperationContext.executeOperation(AbstractOperationContext.java:467)
keycloak_1  | at
org.jboss.as.controller.OperationContextImpl.executeOperation(OperationContextImpl.java:1411)
keycloak_1  | at
org.jboss.as.controller.ModelControllerImpl.internalExecute(ModelControllerImpl.java:423)
keycloak_1  | at
org.jboss.as.controller.ModelControllerImpl.lambda$execute$0(ModelControllerImpl.java:227)
keycloak_1  | at
org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:265)
keycloak_1  | at
org.wildfly.security.auth.server.SecurityIdentity.runAs(SecurityIdentity.java:231)
keycloak_1  | at
org.jboss.as.controller.ModelControllerImpl.execute(ModelControllerImpl.java:227)
keycloak_1  | at
org.jboss.as.jmx.model.ModelControllerMBeanHelper.execute(ModelControllerMBeanHelper.java:555)
keycloak_1  | at
org.jboss.as.jmx.model.ModelControllerMBeanHelper.getAttribute(ModelControllerMBeanHelper.java:316)
keycloak_1  | at
org.jboss.as.jmx.model.ModelControllerMBeanHelper.getAttributes(ModelControllerMBeanHelper.java:294)
keycloak_1  | at
org.jboss.as.jmx.model.ModelControllerMBeanServerPlugin.getAttributes(ModelControllerMBeanServerPlugin.java:146)
keycloak_1  | at
org.jboss.as.jmx.PluggableMBeanServerImpl.getAttributes(PluggableMBeanServerImpl.java:416)
keycloak_1  | at
io.prometheus.jmx.shaded.io.prometheus.jmx.JmxScraper.scrapeBean(JmxScraper.java:151)
keycloak_1  | at
io.prometheus.jmx.shaded.io.prometheus.jmx.JmxScraper.doScrape(JmxScraper.java:117)
keycloak_1  | at
io.prometheus.jmx.shaded.io.prometheus.jmx.JmxCollector.collect(JmxCollector.java:460)
keycloak_1  | at
io.prometheus.jmx.shaded.io.prometheus.client.CollectorRegistry$MetricFamilySamplesEnumeration.findNextElement(CollectorRegistry.java:183)
keycloak_1  | at
io.prometheus.jmx.shaded.io.prometheus.client.CollectorRegistry$MetricFamilySamplesEnumeration.nextElement(CollectorRegistry.java:216)
keycloak_1  | at
io.prometheus.jmx.shaded.io.prometheus.client.CollectorRegistry$MetricFamilySamplesEnumeration.nextElement(CollectorRegistry.java:137)
keycloak_1  | at
io.prometheus.jmx.shaded.io.prometheus.client.exporter.common.TextFormat.write004(TextFormat.java:22)
keycloak_1  | at
io.prometheus.jmx.shaded.io.prometheus.client.exporter.HTTPServer$HTTPMetricHandler.handle(HTTPServer.java:59)
keycloak_1  | at
com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:79)
keycloak_1  | at sun.net.httpserver.AuthFilter.doFilter(AuthFilter.java:83)
keycloak_1  | at
com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:82)
keycloak_1  | at
sun.net.httpserver.ServerImpl$Exchange$LinkHandler.handle(ServerImpl.java:675)
keycloak_1  | at
com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:79)
keycloak_1  | at
sun.net.httpserver.ServerImpl$Exchange.run(ServerImpl.java:647)
keycloak_1  | at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
keycloak_1  | at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
keycloak_1  | at java.lang.Thread.run(Thread.java:748)


We're getting this error on Keycloak 6.0.0, 5.0.0 and 4.8.3Final versions
(we didn't try with previous versions). Is there something we're missing?

Thank you in advance,
Matteo

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