Possible regression after upgrade to [9.0.119] (java.lang.IllegalArgumentException: newPosition > limit: (8175 > 9))

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Hi,

I'm investigating what appears to be a possible regression after upgrading =
Tomcat from 9.0.118 (working) to 9.0.119.

Environment:

  *   Apache Tomcat 9.0.119
  *   Java 21
  *   Running inside Apache Karaf

After the upgrade, one of our release pipeline tests consistently fails whi=
le reading the body of an HTTP POST request.

The exception is:
java.lang.IllegalArgumentException: newPosition > limit: (8175 > 9)
    at java.base/java.nio.Buffer.createPositionException(Buffer.java:352)
    at java.base/java.nio.Buffer.position(Buffer.java:327)
    at java.base/java.nio.ByteBuffer.position(ByteBuffer.java:1551)
    at org.apache.tomcat.util.buf.B2CConverter.convert(B2CConverter.java:30=
0)
    at org.apache.catalina.connector.InputBuffer.realReadChars(InputBuffer.=
java:485)
    at org.apache.catalina.connector.InputBuffer.checkCharBufferEof(InputBu=
ffer.java:691)
    at org.apache.catalina.connector.InputBuffer.read(InputBuffer.java:517)
    at org.apache.catalina.connector.CoyoteReader.read(CoyoteReader.java:10=
8)
    ...

The application code is simply:

private String loadXMLContent(HttpServletRequest request) throws IOExceptio=
n {
    StringBuffer crBuff =3D new StringBuffer();

    try (Reader reader =3D request.getReader()) {
        char[] chBuff =3D new char[500];
        int charsNumber;

        while ((charsNumber =3D reader.read(chBuff)) !=3D -1) {
            crBuff.append(chBuff, 0, charsNumber);
        }
    }

    return crBuff.toString();
}

The exception is thrown from reader.read(...);  there is no custom bufferin=
g or manipulation of the request stream.

The request body is XML and is normally processed without problems on the p=
revious Tomcat version.

I'd like to ask:

  1.  Has anyone seen a similar IllegalArgumentException originating from B=
2CConverter / InputBuffer after upgrading to 9.0.119?
  2.  Are there any known changes in the request body decoding path that co=
uld explain this behavior?
  3.  Is there any additional logging or diagnostics you would recommend to=
 determine whether this is a Tomcat issue or an application/environment iss=
ue?

Best Regards,
Yavor Stankov








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