ArithmeticException: / by zero in HealthView.healthList() when using JMX-Health-Operations

Issue

• When schedulerSupport="false" the method result is ok . However, in activemq.xml, if we keep the schedulerSupport="true", the error is seen.

java.lang.ArithmeticException: / by zero
    at org.apache.activemq.broker.jmx.HealthView.healthList(HealthView.java:158)
    at org.apache.activemq.broker.jmx.HealthView.health(HealthView.java:51)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:93)
    at com.sun.jmx.mbeanserver.StandardMBeanIntrospector.invokeM2(StandardMBeanIntrospector.java:27)
    at com.sun.jmx.mbeanserver.MBeanIntrospector.invokeM(MBeanIntrospector.java:208)
    at com.sun.jmx.mbeanserver.PerInterface.invoke(PerInterface.java:120)
    at com.sun.jmx.mbeanserver.MBeanSupport.invoke(MBeanSupport.java:264)
    at javax.management.StandardMBean.invoke(StandardMBean.java:391)
    at org.apache.activemq.broker.jmx.AnnotatedMBean.invoke(AnnotatedMBean.java:198)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:836)
    at com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:762)
    at org.jolokia.handler.ExecHandler.doHandleRequest(ExecHandler.java:98)
    at org.jolokia.handler.ExecHandler.doHandleRequest(ExecHandler.java:40)
    at org.jolokia.handler.JsonRequestHandler.handleRequest(JsonRequestHandler.java:89)
    at org.jolokia.backend.MBeanServerExecutorLocal.handleRequest(MBeanServerExecutorLocal.java:109)
    at org.jolokia.backend.MBeanServerHandler.dispatchRequest(MBeanServerHandler.java:102)
    at org.jolokia.backend.LocalRequestDispatcher.dispatchRequest(LocalRequestDispatcher.java:98)
    at org.jolokia.backend.BackendManager.callRequestDispatcher(BackendManager.java:409)
    at org.jolokia.backend.BackendManager.handleRequest(BackendManager.java:158)
    at org.jolokia.http.HttpRequestHandler.executeRequest(HttpRequestHandler.java:197)
    at org.jolokia.http.HttpRequestHandler.handlePostRequest(HttpRequestHandler.java:137)
    at org.jolokia.http.AgentServlet$2.handleRequest(AgentServlet.java:399)
    at org.jolokia.http.AgentServlet.handle(AgentServlet.java:287)
    at org.jolokia.http.AgentServlet.doPost(AgentServlet.java:256)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:595)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
    at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:684)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1496)
    at io.hawt.web.AuthenticationFilter$2.run(AuthenticationFilter.java:143)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:396)
    at io.hawt.web.AuthenticationFilter.executeAs(AuthenticationFilter.java:140)
    at io.hawt.web.AuthenticationFilter.doFilter(AuthenticationFilter.java:108)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
    at io.hawt.web.CORSFilter.doFilter(CORSFilter.java:42)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
    at io.hawt.web.CacheHeadersFilter.doFilter(CacheHeadersFilter.java:37)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
    at org.ops4j.pax.web.service.internal.WelcomeFilesFilter.doFilter(WelcomeFilesFilter.java:185)
    at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1467)
    at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:499)
    at org.ops4j.pax.web.service.jetty.internal.HttpServiceServletHandler.doHandle(HttpServiceServletHandler.java:69)
    at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
    at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:533)
    at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
    at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
    at org.ops4j.pax.web.service.jetty.internal.HttpServiceContext.doHandle(HttpServiceContext.java:219)
    at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
    at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
    at org.eclipse.jetty.server.handl