SimpleDateFormat is not thread safe ----------------------------------- Key: ISPN-7579 URL: https://issues.jboss.org/browse/ISPN-7579 Project: Infinispan Issue Type: Bug Components: Remote Protocols Affects Versions: 9.0.0.CR2 Reporter: Tristan Tarrant Assignee: Tristan Tarrant Fix For: 9.0.0.CR4 {{org.infinispan.rest.Server}} has a static field of {{DatePatternRfc1123LocaleUS}}, wihich is an instance of {{SimpleDateFormat}}, and is causing the following error during a load test. {code} 2017-03-03 15:57:55,939 ERROR [org.jboss.resteasy.plugins.server.netty.i18n] (nioEventLoopGroup-6-8) RESTEASY018525: Unexpected: org.jboss.resteasy.spi.UnhandledException: java.lang.ArrayIndexOutOfBoundsException: -2147483648 at org.jboss.resteasy.core.ExceptionHandler.handleApplicationException(ExceptionHandler.java:76) at org.jboss.resteasy.core.ExceptionHandler.handleException(ExceptionHandler.java:212) at org.jboss.resteasy.core.SynchronousDispatcher.writeException(SynchronousDispatcher.java:168) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:411) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:202) at org.jboss.resteasy.plugins.server.netty.RequestDispatcher.service(RequestDispatcher.java:83) at org.jboss.resteasy.plugins.server.netty.RequestHandler.channelRead0(RequestHandler.java:54) at io.netty.channel.SimpleChannelInboundHandler.channelRead(SimpleChannelInboundHandler.java:105) at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:292) at io.netty.channel.AbstractChannelHandlerContext.access$600(AbstractChannelHandlerContext.java:32) at io.netty.channel.AbstractChannelHandlerContext$7.run(AbstractChannelHandlerContext.java:283) at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:358) at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:374) at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112) at io.netty.util.concurrent.DefaultThreadFactory$DefaultRunnableDecorator.run(DefaultThreadFactory.java:137) at java.lang.Thread.run(Thread.java:745) Caused by: java.lang.ArrayIndexOutOfBoundsException: -2147483648 at java.util.Calendar.getDisplayName(Calendar.java:2114) at java.text.SimpleDateFormat.subFormat(SimpleDateFormat.java:1125) at java.text.SimpleDateFormat.format(SimpleDateFormat.java:966) at java.text.SimpleDateFormat.format(SimpleDateFormat.java:936) at java.text.DateFormat.format(DateFormat.java:345) at org.infinispan.rest.Server.org$infinispan$rest$Server$$formatDate(Server.scala:222) at org.infinispan.rest.Server.org$infinispan$rest$Server$$getMimeEntry(Server.scala:140) at org.infinispan.rest.Server$$anonfun$getEntry$1$$anonfun$apply$10.apply(Server.scala:98) at org.infinispan.rest.Server$$anonfun$getEntry$1$$anonfun$apply$10.apply(Server.scala:96) at org.infinispan.rest.Server.org$infinispan$rest$Server$$ensureFreshEnoughEntry(Server.scala:111) at org.infinispan.rest.Server$$anonfun$getEntry$1.apply(Server.scala:95) at org.infinispan.rest.Server$$anonfun$getEntry$1.apply(Server.scala:89) at org.infinispan.rest.Server.protectCacheNotFound(Server.scala:498) at org.infinispan.rest.Server.getEntry(Server.scala:89) at sun.reflect.GeneratedMethodAccessor13.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:139) at org.jboss.resteasy.core.ResourceMethodInvoker.invokeOnTarget(ResourceMethodInvoker.java:295) at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:249) at org.jboss.resteasy.core.ResourceMethodInvoker.invoke(ResourceMethodInvoker.java:236) at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:395) ... 12 more {code} A similar issue is found here: https://github.com/rhuss/jolokia/issues/184