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    <p>If you closely examine the stack trace, all the classes involved (in parsing HTTP text to Java request object) are from the framework and there is <strong>no user control over it</strong>. </p> <p>Now the <strong>basic premise</strong> behind this is: The server will always assume that the data it received is <strong>always URL encoded</strong> and HENCE it will always try to decode. </p> <p>If the decoding fails, that implies that the basic tenets of the HTTP protocol were not adhered to and hence rejects the request outrightly without giving user a chance to handle it.</p> <p>So IMHO, you cannot handle this condition as the server is rightly handling it by itself. </p> <p><strong>EDIT:</strong></p> <p>One the solution proposed by @Ravi above <em>looks</em> like it solves the problem. I tried the same code but I could never catch the exception ! </p> <p>Digging down deeper, it became clear why that exception (<code>java.io.CharConversionException</code>) could not be handled in any user defined code.</p> <p>Though <code>java.io.CharConversionException</code>is thrown but its never propagated in the call hierarchy. Here is why,</p> <p>In the stack trace </p> <pre><code> at org.apache.tomcat.util.buf.UDecoder.convert(UDecoder.java:83) at org.apache.tomcat.util.buf.UDecoder.convert(UDecoder.java:49) at org.apache.tomcat.util.http.Parameters.urlDecode(Parameters.java:429) at org.apache.tomcat.util.http.Parameters.processParameters(Parameters.java:412) </code></pre> <p>Look at the <strong>source</strong> of the method <code>processParameters()</code> in class <code>org.apache.tomcat.util.http.Parameters</code> (Code taken from <a href="http://grepcode.com/file/repository.springsource.com/org.apache.coyote/com.springsource.org.apache.coyote/6.0.18/org/apache/tomcat/util/http/Parameters.java#Parameters.processParameters%28byte%5B%5D,int,int,java.lang.String%29" rel="nofollow">grepcode</a>)</p> <pre><code>public void processParameters( byte bytes[], int start, int len, String enc ) { int end=start+len; int pos=start; if( debug&gt;0 ) log( "Bytes: " + new String( bytes, start, len )); do { boolean noEq=false; int valStart=-1; int valEnd=-1; int nameStart=pos; int nameEnd=ByteChunk.indexOf(bytes, nameStart, end, '=' ); // Workaround for a&amp;b&amp;c encoding int nameEnd2=ByteChunk.indexOf(bytes, nameStart, end, '&amp;' ); if( (nameEnd2!=-1 ) &amp;&amp; ( nameEnd==-1 || nameEnd &gt; nameEnd2) ) { nameEnd=nameEnd2; noEq=true; valStart=nameEnd; valEnd=nameEnd; if( debug&gt;0) log("no equal " + nameStart + " " + nameEnd + " " + new String(bytes, nameStart, nameEnd-nameStart) ); } if( nameEnd== -1 ) nameEnd=end; if( ! noEq ) { valStart= (nameEnd &lt; end) ? nameEnd+1 : end; valEnd=ByteChunk.indexOf(bytes, valStart, end, '&amp;'); if( valEnd== -1 ) valEnd = (valStart &lt; end) ? end : valStart; } pos=valEnd+1; if( nameEnd&lt;=nameStart ) { log.warn("Parameters: Invalid chunk ignored."); continue; // invalid chunk - it's better to ignore } tmpName.setBytes( bytes, nameStart, nameEnd-nameStart ); tmpValue.setBytes( bytes, valStart, valEnd-valStart ); try { addParam( urlDecode(tmpName, enc), urlDecode(tmpValue, enc) ); } catch (IOException e) { // Exception during character decoding: skip parameter log.warn("Parameters: Character decoding failed. " + "Parameter skipped.", e); } tmpName.recycle(); tmpValue.recycle(); } while( pos&lt;end ); } </code></pre> <p>In the method, there is do-while loop for parsing all the request parameters. Look at the <strong>try-catch block</strong> at the end of loop in the method. There is a comment which says</p> <pre><code>// Exception during character decoding: skip parameter </code></pre> <p>So even if the exception is thrown but its <strong>not propagated</strong>. Its logged as a warning message and parameter value is set to null. So it's clear that <strong>you will never be able to catch that exception</strong> (<code>java.io.CharConversionException</code>)</p>
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    1. POUTF-8 | issue with special character on form submit | java.io.CharConversionException
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    1. USSantosh
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    1. COAs Ravi showed, the user can have control over this via Servlet Filters.
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    2. COThat does not work. See my edit. I hope you will reconsider your downvote.
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    3. CO@OldPro, if you had downvoted, please reconsider it. I have given enough proof in my answer.
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