我有一个JSF项目，没有任何过滤器（至少由我创建），只有一个servlet。我在FilterChain执行期间遇到了异常。它会定期发生，也可能每五天发生一次，我不知道它的原因。
堆栈跟踪：
[2017-12-26T16:00:48.245+0300] [glassfish 4.1] [WARNING] [] [org.glassfish.grizzly.filterchain.DefaultFilterChain] [tid: _ThreadID=28 _ThreadName=http-listener-1(4)] [timeMillis: 1514293248245] [levelValue: 900] [[
GRIZZLY0013: Exception during FilterChain execution
java.lang.NullPointerException
at org.glassfish.grizzly.http.server.io.ServerInputBuffer.getThreadPool(ServerInputBuffer.java:114)
at org.glassfish.grizzly.http.io.InputBuffer.invokeHandlerOnProperThread(InputBuffer.java:1081)
at org.glassfish.grizzly.http.io.InputBuffer.append(InputBuffer.java:975)
at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:271)
at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133)
at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112)
at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:561)
at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:565)
at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:545)
at java.lang.Thread.run(Thread.java:722)
]]
我该如何解决？