tomcat异常，Character decoding failed.....java.io.CharConversionException: isHexDig

我在客户端向servlet发送一个大小为60000的byte数组，这个数组存放了一些信息，是经过位操作后的数组。但是发送这个数组，servlet服务器就会报下面这个异常，如果重新创建一个大小一样的byte数组，就没问题。
请问是什么原因。servlet直接返回http 500异常了。

java.io.CharConversionException: isHexDigit
at org.apache.tomcat.util.buf.UDecoder.convert(UDecoder.java:85)
at org.apache.tomcat.util.buf.UDecoder.convert(UDecoder.java:46)
at org.apache.tomcat.util.http.Parameters.urlDecode(Parameters.java:410)
at org.apache.tomcat.util.http.Parameters.processParameters(Parameters.java:370)
at org.apache.tomcat.util.http.Parameters.processParameters(Parameters.java:217)
at org.apache.catalina.connector.Request.parseParameters(Request.java:2647)
at org.apache.catalina.connector.Request.getParameter(Request.java:1106)
at org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:355)
at ci123.server.doPost(server.java:161)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
at java.lang.Thread.run(Thread.java:636)

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