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Asked: 2026-05-10T16:34:43+00:00

This exception peppers our production catalina logs on a simple ‘getParameter()’ call. WARNING: Parameters:

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This exception peppers our production catalina logs on a simple ‘getParameter()’ call.

 WARNING: Parameters: Character decoding failed. Parameter skipped.  java.io.CharConversionException: EOF     at org.apache.tomcat.util.buf.UDecoder.convert(UDecoder.java:82)     at org.apache.tomcat.util.buf.UDecoder.convert(UDecoder.java:48)     at org.apache.tomcat.util.http.Parameters.urlDecode(Parameters.java:411)     at org.apache.tomcat.util.http.Parameters.processParameters(Parameters.java:393)     at org.apache.tomcat.util.http.Parameters.processParameters(Parameters.java:509)     at org.apache.tomcat.util.http.Parameters.handleQueryParameters(Parameters.java:266)     at org.apache.catalina.connector.Request.parseParameters(Request.java:2361)     at org.apache.catalina.connector.Request.getParameter(Request.java:1005)     at org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:353)     at javax.servlet.ServletRequestWrapper.getParameter(ServletRequestWrapper.java:158)

Or Sometimes:

 java.io.CharConversionException: isHexDigit     at org.apache.tomcat.util.buf.UDecoder.convert(UDecoder.java:87)     at org.apache.tomcat.util.buf.UDecoder.convert(UDecoder.java:48)     at org.apache.tomcat.util.http.Parameters.urlDecode(Parameters.java:411)     at org.apache.tomcat.util.http.Parameters.processParameters(Parameters.java:393)     at org.apache.tomcat.util.http.Parameters.processParameters(Parameters.java:509)     at org.apache.tomcat.util.http.Parameters.handleQueryParameters(Parameters.java:266)     at org.apache.catalina.connector.Request.parseParameters(Request.java:2361)     at org.apache.catalina.connector.Request.getParameter(Request.java:1005)     at org.apache.catalina.connector.RequestFacade.getParameter(RequestFacade.java:353)     at javax.servlet.ServletRequestWrapper.getParameter(ServletRequestWrapper.java:158)
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1 Answer

  1. Just hypothesizing here. Seems like the URL-decoding of parameters or their values fails (URL-encoding means encoding some characters using the %XX or %XXXX notation where XX or XXXX is the hexadecimal code of the character in ISO-8859-1 or Unicode). In the first case the error might be happening because there aren’t enough hexadecimal characters after the % character. In the second case this might be happening because a character after the % character isn’t hexadecimal.

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