java.lang.NullPointerException: null

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java.lang.NullPointerException: null
at hprose.server.HproseService.getErrorMessage(HproseService.java:512)
at hprose.server.HproseService.sendError(HproseService.java:522)
at hprose.server.HproseHttpService1.onTimeout(HproseHttpService.java:208)
at org.apache.catalina.core.AsyncListenerWrapper.fireOnTimeout(AsyncListenerWrapper.java:40)
at org.apache.catalina.core.AsyncContextImpl.timeout(AsyncContextImpl.java:155)
at org.apache.coyote.http11.AbstractHttp11Processor.asyncDispatch(AbstractHttp11Processor.java:1715)
at org.apache.coyote.AbstractProtocolAbstractConnectionHandler.process(AbstractProtocol.java:652)
at org.apache.tomcat.util.net.NioEndpointSocketProcessor.doRun(NioEndpoint.java:1500)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutorWorker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

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