SimpleDateFormat is not thread safe

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