SpringBoot The contents of the error template are displaying inline when an Exception is raised.

I'm not entirely sure if this goes in the Thymeleaf project or the Spring Boot project. Spring Boot 2.5.4 Custom ErrorController

The template I have contains a number of large tables. At a certain point in the template, if I encounter an Exception I am no longer redirected to the Error Page I created. Instead, my Error Page is embedded inline with the partially rendered template. If I move me error back a few lines in the template, the Error Page displays as expected.

Here's my ErrorController

package com.csi.smartspooler.controllers;

import java.util.ArrayList;
import java.util.Enumeration;
import java.util.List;

import javax.servlet.RequestDispatcher;
import javax.servlet.http.HttpServletRequest;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.springframework.boot.web.servlet.error.ErrorController;
import org.springframework.http.HttpStatus;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.util.HtmlUtils;

import lombok.RequiredArgsConstructor;

@Controller
@RequiredArgsConstructor
public class MainErrorController implements ErrorController //
{
  private static final Logger LOG = LogManager.getFormatterLogger();
  private final BaseController base;

  @RequestMapping("/error")
  public String error(final HttpServletRequest request, final Model model) {
    LOG.debug("handling error");
    Object status = request.getAttribute(RequestDispatcher.ERROR_STATUS_CODE);
    Integer statusCode = status == null ? -1
        : Integer.valueOf(status.toString());
    Object errorMessageObj = request
        .getAttribute(RequestDispatcher.ERROR_MESSAGE);

    Exception exception = (Exception) request
        .getAttribute("javax.servlet.error.exception");

    List<String> allErrors = new ArrayList<>();
    String errsList = "";
    if (exception != null) {
      allErrors = getAllErrors(exception);
      for (String err : allErrors) {
        LOG.error("err [%s]", err);
        errsList += "<br>" + HtmlUtils.htmlEscape(err);
      }
      LOG.error(exception);
    }

    String errorMessage = statusCode == HttpStatus.NOT_FOUND.value()
        ? "Not Found"
        : (errorMessageObj == null ? "Unknown" : errorMessageObj.toString());

    errorMessage = exception == null ? errorMessage
        : String.format("%s<br>%s%s", //
            (errorMessage == null || "".equals(errorMessage)) ? ""
                : (errorMessage), //
            exception.getClass().getName(), //
            errsList);

    Object requestURI = request
        .getAttribute(RequestDispatcher.FORWARD_REQUEST_URI);
    Object requestQueryString = request
        .getAttribute(RequestDispatcher.FORWARD_QUERY_STRING);

    Enumeration<String> attNames = request.getAttributeNames();
    while (attNames.hasMoreElements()) {
      String attName = attNames.nextElement();
      Object attValue = request.getAttribute(attName);
      LOG.debug(String.format("%s : '%s'", attName, attValue));
    }
    String requestedUrl = String.format("%s%s", requestURI,
        (requestQueryString == null ? "" : ("?" + requestQueryString)));
    LOG.error(String.format("requestedUrl %s, statusCode %s, errorMessage %s",
        requestedUrl, statusCode, errorMessage));

    model.addAttribute("requestedUrl", requestedUrl);
    model.addAttribute("statusCode", statusCode);
    model.addAttribute("errorMessage", errorMessage);
    model.addAttribute("myVersion", base.versionService.getVersion());
    model.addAttribute("title", "Error");
    model.addAttribute("user", base.getUser());

    return "error";
  }

  private List<String> getAllErrors(final Throwable exception) {
    List<String> allErrors = new ArrayList<>();
    allErrors.add(exception.getMessage());
    Throwable cause = exception.getCause();
    if (cause != null) {
      List<String> errors = getAllErrors(cause);
      for (String error : errors) {
        if (!allErrors.contains(error)) {
          allErrors.add(error);
        }
      }
    }
    return allErrors;
  }
}

Here's my error template

<!DOCTYPE HTML>
<html lang="en" xmlns:th="http://www.thymeleaf.org">
<head>
<meta charset="utf-8">
<meta name="viewport"
    content="width=device-width, initial-scale=1, shrink-to-fit=no">

<title th:text="'SmartSpooler Configuration v' + ${smartspoolerVersion}"></title>
<link th:replace="fragments :: ss-Header" />
</head>

<body>

    <main role="main" class="container ss-Fill">

        <div th:replace="fragments :: ss-Navbar"></div>

        <h3>Error Page</h3>
        <div>
            Requested URL: <b th:text=${requestedURL}></b>
        </div>
        <div>
            Status code: <b th:text=${statusCode}></b>
        </div>
        <div>
            Error Message: <b th:utext=${errorMessage}></b>
        </div>

    </main>

    <div th:replace="fragments :: ss-Footer"></div>

</body>
</html>

Here's the template with the error introduced to exercise this issue.

<!DOCTYPE HTML>
<html lang="en" xmlns:th="http://www.thymeleaf.org"
  th:object="${lineConfig}">
<head>
<meta charset="utf-8">
<meta name="viewport"
  content="width=device-width, initial-scale=1, shrink-to-fit=no">

<title th:text="${title}"></title>
<link th:replace="fragments :: ss-Header" />
</head>

<body>

  <main role="main" class="ss-Fill">


    <div th:replace="fragments :: ss-Navbar"></div>

    <div
      th:replace="${sessionService.getAndRemoveAttribute('updated')} ? ~{fragments :: ss-Updated} : _"></div>

    <div
      th:replace="${#fields.hasAnyErrors()} ? ~{fragments :: ss-Errors} : _"></div>

    <form action="#" th:action="@{/lineconfig}"
      th:object="${lineConfig}" method="POST" id="myForm">

      <input name="uuid" type="hidden" th:field="*{uuid}" />


      <div class="bg-dark text-white"
        style="padding-left: 8px; font-size: 1.5em;">Line
        Parameters</div>

      <table class="table table-striped table-sm"
        style="table-layout: fixed; word-wrap: break-word;">

        <thead class="thead-dark">
          <tr>
            <th scope="col" style="width: 25%">&nbsp;</th>
            <th scope="col" style="width: 25%">Current</th>
            <th scope="col" style="width: 50%">New</th>
          </tr>
        </thead>

        <tbody>

          <tr
            th:replace="fragments :: ss-ReadOnlyEnum(
              title='Line Number',
              fieldName='lineNumber',  
              origConfig=${origConfig})"></tr>
          <tr
            th:replace="fragments :: ss-ReadOnlyEnum(
              title='MCCI Port',
              fieldName='mcciPort',  
              origConfig=${origConfig})"></tr>

          <tr
            th:replace="fragments :: ss-ReadOnlyText(
              title='Source Filename',
              fieldName='sourceFilename',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

          <tr
            th:replace="fragments :: ss-EnumSingleSelect(
              values=${@domainService.lineType()}, 
              title='Line Type', 
              fieldName='lineType', 
              formFields=${#fields}, 
              origConfig=${origConfig})"></tr>

          <tr
            th:replace="fragments :: ss-Input(
              title='Transmit Channel ID',
              fieldName='transmitChannelId',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

          <tr
            th:replace="fragments :: ss-Input(
              title='Receive Channel ID',
              fieldName='receiveChannelId',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

          <tr
            th:replace="fragments :: ss-Input(
              title='TCP Port (1-65535)',
              fieldName='tcpPort',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

          <tr
            th:replace="fragments :: ss-Input(
              title='FDMP Block Size (64-1024)',
              fieldName='fdmpBlockSize',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

          <tr
            th:replace="fragments :: ss-Checkbox(
              title='Line Enabled',
              fieldName='lineEnabled',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

          <tr
            th:replace="fragments :: ss-Checkbox(
              title='Loopback',
              fieldName='loopback',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

          <tr
            th:replace="fragments :: ss-EnumSingleSelect(
              values=${@domainService.charSet()}, 
              title='Character Set', 
              fieldName='serialCharacterSet', 
              formFields=${#fields}, 
              origConfig=${origConfig})"></tr>

          <tr
            th:replace="fragments :: ss-EnumSingleSelect(
              values=${@domainService.baudRate()}, 
              title='Baud Rate',
              fieldName='serialBaudRate',               
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

          <tr
            th:replace="fragments :: ss-EnumSingleSelect(
              values=${@domainService.parity()}, 
              title='Parity',
              fieldName='serialParity', 
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

          <tr
            th:replace="fragments :: ss-EnumSingleSelect(
              values=${@domainService.dataBits()}, 
              title='Data Bits',
              fieldName='serialDataBits', 
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

          <tr
            th:replace="fragments :: ss-EnumSingleSelect(
              values=${@domainService.stopBits()}, 
              title='Stop Bits',
              fieldName='serialStopBits', 
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

          <tr
            th:replace="fragments :: ss-EnumSingleSelect(
              values=${@domainService.replacementCharacter()}, 
              title='Parity Replacement Character',
              fieldName='parityReplacementChar', 
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

          <tr
            th:replace="fragments :: ss-EnumSingleSelect(
              values=${@domainService.replacementCharacter()}, 
              title='Buffer Overrun Replacement Character',
              fieldName='bufferOverrunReplacementChar', 
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

          <tr
            th:replace="fragments :: ss-EnumSingleSelect(
              values=${@domainService.replacementCharacter()}, 
              title='Framing Error Replacement Character',
              fieldName='framingErrorReplacementChar', 
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

ERROR INTRODUCED HERE <!--  
          <tr
            th:replace="fragments :: ss-EnumSingleSelect(
              values=${@domainService.clockSource()}, 
              title='Clock Source',
              fieldName='clockSource', 
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

          <tr
            th:replace="fragments :: ss-EnumSingleSelect(
              values=${@domainService.polarity()}, 
              title='Clock Polarity',
              fieldName='clockPolarity', 
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

          <tr
            th:replace="fragments :: ss-EnumSingleSelect(
              values=${@domainService.polarity()}, 
              title='Data Polarity',
              fieldName='dataPolarity', 
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

          <tr
            th:replace="fragments :: ss-EnumSingleSelect(
              values=${@domainService.polarity()}, 
              title='DTR/CD Polarity',
              fieldName='dtrCdPolarity', 
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

          <tr
            th:replace="fragments :: ss-EnumSingleSelect(
              values=${@domainService.polarity()}, 
              title='RTS/CTS Polarity',
              fieldName='rtsCtsPolarity', 
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

        </tbody>
      </table>

      <div class="table-responsive">

        <div class="bg-dark text-white"
          style="padding-left: 8px; font-size: 1.5em;">Parser
          Parameters</div>

        <table class="table table-striped table-sm"
          style="table-layout: fixed; word-wrap: break-word;">

          <thead class="thead-dark">
            <tr>
              <th scope="col" style="width: 25%">&nbsp;</th>
              <th scope="col" style="width: 25%">Current</th>
              <th scope="col" style="width: 50%">New</th>
            </tr>
          </thead>

          <tbody>

            <tr
              th:replace="fragments :: ss-ListSingleSelect(
              title='Parser Name',
              fieldName='parserName', 
              listSelections=${parserNamesList},
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-Input(
              title='Parser Timeout (0-60 secs)',
              fieldName='parserTimeout',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-Input(
              title='Parser Max Size (1-6160 kilobytes)',
              fieldName='parserMaxSize',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>


            <tr
              th:replace="fragments :: ss-Input(
              title='Parser Max Unresolved Size (bytes)',
              fieldName='maxUnresolvedSize',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

          </tbody>
        </table>
      </div>

      <div class="table-responsive">

        <div class="bg-dark text-white"
          style="padding-left: 8px; font-size: 1.5em;">Wrapping
          Parameters</div>

        <table class="table table-striped table-sm"
          style="table-layout: fixed; word-wrap: break-word;">

          <thead class="thead-dark">
            <tr>
              <th scope="col" style="width: 25%">&nbsp;</th>
              <th scope="col" style="width: 25%">Current</th>
              <th scope="col" style="width: 50%">New</th>
            </tr>
          </thead>

          <tbody>

            <tr
              th:replace="fragments :: ss-Input(
              title='LMF', fieldName='wrappingLMF',
              formFields=${#fields}, origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-EnumSingleSelect(
              values=${@domainService.classification()}, 
              title='Classification',
              fieldName='wrappingClassification', 
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-ReadOnlyText(
              title='Classification Prosign',
              fieldName='wrappingClassificationProsign',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-Input(
              title='CIC',
              fieldName='wrappingCIC',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-Input(
              title='Subject',
              fieldName='wrappingSubject',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-Input(
              title='Account Code',
              fieldName='wrappingAccountCode',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-Input(
              title='OPS Signals',
              fieldName='wrappingOpsSignals',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-Input(
              title='OSRI',
              fieldName='wrappingOSRI',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-Input(
              title='TRC',
              fieldName='wrappingTRC',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-Input(
              title='From PLA',
              fieldName='wrappingFromPLA',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-Input(
              title='DSRIs',
              fieldName='wrappingDSRIs',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-Input(
              title='ALTRI',
              fieldName='wrappingALTRI',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-Input(
              title='Security Words',
              fieldName='wrappingSecurityWords',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-Input(
              title='XMT PLAs',
              fieldName='wrappingXmtPLAs',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-Input(
              title='Action PLAs',
              fieldName='wrappingActionPLAs',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-Input(
              title='Info PLAs',
              fieldName='wrappingInfoPLAs',
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-EnumSingleSelect(
              values=${@domainService.precedence()}, 
              title='Action Precedence',
              fieldName='wrappingActionPrecedence', 
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-NullableEnumSingleSelect(
              values=${@domainService.precedence()}, 
              title='Info Precedence',
              fieldName='wrappingInfoPrecedence', 
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-EnumSingleSelect(
              values=${@domainService.precedence()}, 
              title='CCOMS High Action Precedence',
              fieldName='wrappingCCOMSHighActionPrecedence', 
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-NullableEnumSingleSelect(
              values=${@domainService.precedence()}, 
              title='CCOMS High Info Precedence',
              fieldName='wrappingCCOMSHighInfoPrecedence', 
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-EnumSingleSelect(
              values=${@domainService.precedence()}, 
              title='CCOMS Normal Action Precedence',
              fieldName='wrappingCCOMSNormalActionPrecedence', 
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-NullableEnumSingleSelect(
              values=${@domainService.precedence()}, 
              title='CCOMS Normal Info Precedence',
              fieldName='wrappingCCOMSNormalInfoPrecedence', 
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-EnumSingleSelect(
              values=${@domainService.precedence()}, 
              title='ID High Action Precedence',
              fieldName='wrappingIDHighActionPrecedence', 
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-NullableEnumSingleSelect(
              values=${@domainService.precedence()}, 
              title='ID High Info Precedence',
              fieldName='wrappingIDHighInfoPrecedence', 
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-EnumSingleSelect(
              values=${@domainService.precedence()}, 
              title='ID Normal Action Precedence',
              fieldName='wrappingIDNormalActionPrecedence', 
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

            <tr
              th:replace="fragments :: ss-NullableEnumSingleSelect(
              values=${@domainService.precedence()}, 
              title='ID Normal Info Precedence',
              fieldName='wrappingIDNormalInfoPrecedence', 
              formFields=${#fields},
              origConfig=${origConfig})"></tr>

          </tbody>
        </table>
      </div>

      <span th:replace="fragments :: ss-Buttons"></span>

    </form>

  </main>

  <div th:replace="fragments :: ss-Footer"></div>

  <script th:replace="fragments :: ss-FormScripts"></script>


</body>
</html>

And finally here's the fragments template

<!--  FRAGMENT :: ss-Header -->
<div th:fragment="ss-Header" th:remove="tag">
  <link rel="icon" href="/favicon.ico" type="image/x-icon" />
  <link rel="shortcut icon" href="/favicon.ico" type="image/x-icon" />
  <link rel="stylesheet"
    href="webjars/bootstrap/4.3.1/css/bootstrap.min.css" />
  <link rel="stylesheet" href="ssWeb.css" />
</div>


<!-- FRAGMENT :: ss-Header -->
<div th:fragment="ss-Navbar" class="bg-dark ss-Fill"
  style="display: inline-block; clear: right;">

  <div class="bg-dark">

    <div class="float-left">
      <h3 style="margin-left: 10px; margin-top: 5px;"
        class="bg-dark text-white" th:text="${title}">REPLACE -
        TITLE</h3>
    </div>

    <div class="float-right" style="margin-right: 10px;">
      <p>
        <a th:unless="${hideHomeLink}"
          style="font-size: 1em; margin-top: 1px;"
          class="float-right text-white" href="/">Main Menu</a> <a
          th:if="${hideHomeLink}"
          style="opacity: 0; font-size: 1em; margin-top: 1px;"
          class="float-right text-white text-decoration-none" href="/">&nbsp;</a>
      </p>
      <p class="mb-0 float-right text-white"
        style="font-size: 0.7em; margin-top: 3px; padding-bottom: 3px;"
        th:text="'v-' + ${myVersion}">REPLACE - VERSION</p>
    </div>

  </div>
</div>


<!-- FRAGMENT :: ss-Updated -->
<h4 th:fragment="ss-Updated" class="text-success ss-Fill"
  style="display: inline-block; clear: right; text-align: center;">SUCCESSFULLY
  UPDATED</h4>


<!-- FRAGMENT :: ss-Errors -->
<h4 th:fragment="ss-Errors" class="text-danger ss-Fill"
  style="display: inline-block; clear: right; text-align: center;">--
  PLEASE FIX ERRORS --</h4>


<!-- FRAGMENT :: ss-NullableEnumSingleSelect -->
<tr
  th:fragment="ss-NullableEnumSingleSelect (values, title, fieldName, formFields, origConfig)">
  <th scope="row">
    <div th:text="${title}">REPLACE - TITLE</div>
  </th>
  <td>
    <div
      th:style="${origConfig.__${fieldName}__} == null ? 'font-weight: bold;' : _"
      th:text="${origConfig.__${fieldName}__} == null ? '-- NOT CONFIGURED --' : ${origConfig.__${fieldName}__.getDisplayValue()}">REPLACE
      - CURRENT VALUE</div>
  </td>
  <td><select
    th:classappend="${formFields.hasErrors('__${fieldName}__')} ? 'is-invalid' : _"
    th:id="${fieldName}" class="ss-singleSelect ss-W90 form-control"
    th:field="*{__${fieldName}__}">
      <option value="">-- NOT CONFIGURED --</option>
      <option th:each="enum : ${values}" th:value="${enum}"
        th:text="${enum.displayValue}"></option>
  </select> 
  <!--/* ERRORS */-->
    <div th:if="${formFields.hasErrors('__${fieldName}__')}"
      style="clear: left;" class="text-danger float-left"
      th:errors="*{__${fieldName}__}"></div></td>
</tr>


<!-- FRAGMENT :: ss-EnumSingleSelect -->
<tr
  th:fragment="ss-EnumSingleSelect (values, title, fieldName, formFields, origConfig)">
  <th scope="row">
    <div th:text="${title}">REPLACE - TITLE</div>
  </th>
  <td>
    <div
      th:style="${origConfig.__${fieldName}__} == null ? 'font-weight: bold;' : _"
      th:text="${origConfig.__${fieldName}__} == null ? '-- NOT CONFIGURED --' : ${origConfig.__${fieldName}__.getDisplayValue()}">REPLACE
      - CURRENT VALUE</div>
  </td>
  <td><select th:id="${fieldName}"
    class="ss-singleSelect ss-W90 form-control"
    th:field="*{__${fieldName}__}">
      <option th:each="enum : ${values}" th:value="${enum}"
        th:text="${enum.displayValue}"></option>
  </select></td>
</tr>

<!-- FRAGMENT :: ss-ListSingleSelect -->
<tr
  th:fragment="ss-ListSingleSelect (title, fieldName, listSelections, formFields, origConfig)">
  <th scope="row">
    <div th:text="${title}">REPLACE - TITLE</div>
  </th>
  <td>
    <div th:text="${origConfig.__${fieldName}__}">REPLACE -
      CURRENT VALUE</div>
  </td>
  <td><select th:id="${fieldName}"
    class="ss-singleSelect ss-W90 form-control"
    th:field="*{__${fieldName}__}">
      <option th:each="listSelection : ${listSelections}"
        th:value="${listSelection}" th:text="${listSelection}"></option>
  </select></td>
</tr>


<!-- FRAGMENT :: ss-Input -->
<tr th:fragment="ss-Input (title, fieldName, formFields, origConfig)">
  <th scope="row">
    <div th:text="${title}">REPLACE - TITLE</div>
  </th>

  <td>
    <div
      th:style="${origConfig.__${fieldName}__} == null ? 'font-weight: bold;' : _"
      th:text="${origConfig.__${fieldName}__} == null ? '-- NOT CONFIGURED --' : ${origConfig.__${fieldName}__}">REPLACE
      - CURRENT VALUE</div>
  </td>

  <td><input
    th:classappend="${formFields.hasErrors('__${fieldName}__')} ? 'is-invalid' : _"
    class="ss-W90 form-control" type="text"
    th:field="*{__${fieldName}__}" /> 
    <!--/* ERRORS */-->
    <div th:if="${formFields.hasErrors('__${fieldName}__')}"
      style="clear: left;" class="text-danger float-left"
      th:errors="*{__${fieldName}__}"></div></td>

</tr>


<!-- FRAGMENT :: ss-Checkbox -->
<tr th:fragment="ss-Checkbox (title, fieldName, formFields, origConfig)">
  <th scope="row">
    <div th:text="${title}">REPLACE - TITLE</div>
  </th>
  <td>
    <div th:text="${origConfig.__${fieldName}__.booleanValue()} ? 'YES' : 'NO'">REPLACE
      - CURRENT VALUE</div>
  </td>
  <td><div>
      <input class="ss-Checkbox" th:name="${fieldName}" th:id="${fieldName}" 
        type="checkbox" th:checked="*{__${fieldName}__.booleanValue()}" />
    </div></td>
</tr>


<!-- FRAGMENT :: ss-ReadOnlyText -->
<tr
  th:fragment="ss-ReadOnlyText (title, fieldName, formFields, origConfig)">
  <th scope="row">
    <div th:text="${title}">REPLACE - TITLE</div>
  </th>
  <td>
    <div th:text="${origConfig.__${fieldName}__}">REPLACE -
      CURRENT VALUE</div>
  </td>
  <td>NOT EDITABLE <input type="hidden"
    th:field="*{__${fieldName}__}" />
  </td>
</tr>

<!-- FRAGMENT :: ss-ReadOnlyEnum -->
<tr
  th:fragment="ss-ReadOnlyEnum (title, fieldName, origConfig)">
  <th scope="row">
    <div th:text="${title}">REPLACE - TITLE</div>
  </th>

  <td>
    <div th:text="${origConfig.__${fieldName}__.getDisplayValue()}">REPLACE
      - CURRENT VALUE</div>
  </td>

  <td>NOT EDITABLE <input type="hidden"
    th:field="*{__${fieldName}__}" /></td>
</tr>

<!-- FRAGMENT :: ss-Buttons -->
<span th:fragment="ss-Buttons" th:remove="tag">
  <hr> <a type="submit" href="#"
  onclick="document.getElementById('myForm').submit()"
  style="width: 100px; margin: 4px 2px; cursor: default;"
  class="btn btn-primary" role="button">Submit</a> <a
  style="width: 100px; margin: 4px 2px; cursor: default;"
  th:href="${session.resetURL}" class="btn btn-primary" role="button">Reset</a>
</span>


<!-- FRAGMENT :: ss-Footer -->
<div th:fragment="ss-Footer" th:remove="tag">
  <script type="text/javascript"
    src="webjars/jquery/3.4.1/jquery.min.js"></script>
  <script type="text/javascript"
    src="webjars/bootstrap/4.3.1/js/bootstrap.min.js"></script>
</div>

<!-- FRAGMENT :: ss-FormScripts -->
<script th:fragment="ss-FormScripts" type="text/javascript">
    document.onkeypress = keyPress;
    function keyPress(e) {
        var x = e || window.event;
        var key = (x.keyCode || x.which);
        if (key == 13 || key == 3) {
            tagName = document.activeElement.tagName;
            console.log(tagName);
            if (tagName != 'TEXTAREA') {
                document.getElementById('myForm').submit();
            }
        }
    }
</script>

Comment From: philwebb

I suspect this is a buffering issue where a flush has occurred before the exception happens. You could try adding spring.thymeleaf.servlet.produce-partial-output-while-processing=false to your application.properties to see if that solves the problem.

If that doesn't work, please provide a sample application as a GitHub project or a zip file so we can debug things.

Comment From: mdwheaton

Yep, that was it. Looks like I need to read these default options much more carefully. Thank you!

On Fri, Aug 27, 2021 at 5:25 PM Phil Webb @.***> wrote:

I suspect this is a buffering issue where a flush has occurred before the exception happens. You could try adding spring.thymeleaf.servlet.produce-partial-output-while-processing=false to your application.properties to see if that solves the problem.

If that doesn't work, please provide a sample application as a GitHub project or a zip file so we can debug things.

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Comment From: mdwheaton

Yep, that was it. Looks like I need to read these default options much more carefully.