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Bug
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Resolution: Not a Bug
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Major
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None
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13.0.20.Final
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None
Problem description
I am using the jmx_prometheus_javaagent to export all my jmx-metrics to prometheus. But when I have an Embedded Infinispan Cache in my application, the following exception occurs:
prometheus-http-1-1 28-10-2023 11:35:18.175 org.infinispan.jmx.ResourceDMBean.java:322 - Exception while reading value of attribute crossSiteReplicationTimes java.lang.NullPointerException: null at org.infinispan.jmx.ResourceDMBean$InvokableSetterBasedMBeanAttributeInfo.invoke(ResourceDMBean.java:428) at org.infinispan.jmx.ResourceDMBean.getNamedAttribute(ResourceDMBean.java:317) at org.infinispan.jmx.ResourceDMBean.getAttribute(ResourceDMBean.java:199) at java.management/com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:641) at java.management/com.sun.jmx.mbeanserver.JmxMBeanServer.getAttribute(JmxMBeanServer.java:678) at io.prometheus.jmx.JmxScraper.processAttributesOneByOne(JmxScraper.java:261) at io.prometheus.jmx.JmxScraper.scrapeBean(JmxScraper.java:211) at io.prometheus.jmx.JmxScraper.doScrape(JmxScraper.java:149) at io.prometheus.jmx.JmxCollector.collect(JmxCollector.java:771) at io.prometheus.jmx.shaded.io.prometheus.client.Collector.collect(Collector.java:45) at io.prometheus.jmx.shaded.io.prometheus.client.CollectorRegistry$MetricFamilySamplesEnumeration.findNextElement(CollectorRegistry.java:204) at io.prometheus.jmx.shaded.io.prometheus.client.CollectorRegistry$MetricFamilySamplesEnumeration.nextElement(CollectorRegistry.java:219) at io.prometheus.jmx.shaded.io.prometheus.client.CollectorRegistry$MetricFamilySamplesEnumeration.nextElement(CollectorRegistry.java:152) at io.prometheus.jmx.shaded.io.prometheus.client.exporter.common.TextFormat.write004(TextFormat.java:71) at io.prometheus.jmx.shaded.io.prometheus.client.exporter.common.TextFormat.writeFormat(TextFormat.java:53) at io.prometheus.jmx.shaded.io.prometheus.client.exporter.HTTPServer$HTTPMetricHandler.handle(HTTPServer.java:100) at jdk.httpserver/com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:77) at jdk.httpserver/sun.net.httpserver.AuthFilter.doFilter(AuthFilter.java:82) at jdk.httpserver/com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:80) at jdk.httpserver/sun.net.httpserver.ServerImpl$Exchange$LinkHandler.handle(ServerImpl.java:848) at jdk.httpserver/com.sun.net.httpserver.Filter$Chain.doFilter(Filter.java:77) at jdk.httpserver/sun.net.httpserver.ServerImpl$Exchange.run(ServerImpl.java:817) at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128) at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628) at java.base/java.lang.Thread.run(Thread.java:829)
The same for:
- org.infinispan.interceptors.impl.CacheMgmtInterceptor#setHitTimes
- org.infinispan.interceptors.impl.CacheMgmtInterceptor#setMissTimes
- org.infinispan.interceptors.impl.CacheMgmtInterceptor#setStoreTimes
- org.infinispan.interceptors.impl.CacheMgmtInterceptor#setRemoveTimes
- org.infinispan.remoting.rpc.RpcManagerImpl#isStatisticsEnabled
Something seems to be causing 'wrong number of arguments'.
Problem cause
At RpcManagerImpl#setCrossSiteReplicationTimes(RpcManagerImpl.java:614) the method is annotated with '@ManagedAttribute' meaning that the method can be called to get a certain attribute. From the ManagedAttribute-annotations, the class CorePackageImpl.java is generated that in some way registers the attributes that can be obtained from the RpcManagerImpl. This causes the prometheus/jmx_exporter (via Infinispan ResourceDMBean) to retrieve the attribute. As it does not exist, it fails.
Problem solution
Maybe should the '@ManagedAttribute'-annotation be changed to a '@ManagedOperation'-annotation??
