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<h1>Changes</h1>
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<b>This page details the changes made in the current version only.</b>
<br>
Earlier changes are detailed in the <a href="changes_history.html">History of Previous Changes</a>.
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<h1>Version 5.5</h1>
<p>
Summary
</p>
<ul>
<li>
<a href="#New and Noteworthy">New and Noteworthy</a>
</li>
<li>
<a href="#Incompatible changes">Incompatible changes</a>
</li>
<li>
<a href="#Bug fixes">Bug fixes</a>
</li>
<li>
<a href="#Improvements">Improvements</a>
</li>
<li>
<a href="#Non-functional changes">Non-functional changes</a>
</li>
<li>
<a href="#Known problems and workarounds">Known problems and workarounds</a>
</li>
<li>
<a href="#Thanks">Thanks</a>
</li>
</ul>
<h2 class="ch_section" id="New and Noteworthy">New and Noteworthy</h2>
<p>JMeter now supports Java 17</p>
<p>JMeter 5.5 ships with log4j2 2.17.2</p>
<h3 class="ch_title">Open Model Thread Group</h3>
<p>New component: <span class="code"><a href="./usermanual/component_reference.html#Open_Model_Thread_Group">Open Model Thread Group</a></span>
allows creating load profiles with variable load.</p>
<p>For example, if you need to gradually increase load from <span class="code">0/sec</span> to <span class="code">10/sec</span> during <span class="code">minute</span>
you could previously use <span class="code">Thread Group + Timer</span> combinations. However, then you need to compute
the expected number of threads, ensure they are created only when needed, and so on.</p>
<p>With <span class="code">Open Model Thread Group</span> you can configure the same load profile as <span class="code">rate(0/sec) random_arrivals(1&nbsp;minute) rate(10/sec)</span>.
The thread group would spawn threads as needed to drive the configured load.
The load profile can use properties, so you can launch the same script with slightly different load levels,
however, the profile can't be updated while the test is running.
</p>
<p>The new thread group is experimental in JMeter 5.5, so please feel free to submit your feedback.</p>
<figure>
<a href="./images/screenshots/open_model_thread_group.png"><img src="./images/screenshots/open_model_thread_group.png" width="1398" height="1117" alt="Open Model Thread Group sample"></a>
<figcaption>Open Model Thread Group sample</figcaption>
</figure>
<h3 class="ch_title">Preparing the deprecation of Oro Regex usage</h3>
<p>Another experimental feature in JMeter 5.5 is the ability to replace the Oro based Regex implementation
by the built-in Java based one. To choose the Java based one, set the JMeter property <span class="code">jmeter.regex.engine</span>
to the value <span class="code">java</span>.</p>
<h3 class="ch_title">Core improvements</h3>
<p>Kotlin language is now used in some core classes and tests (e.g. Open Model Thread Group).
JMeter is compiled with <span class="code">apiTarget=1.5</span>, and it ships with <span class="code">kotlin-stdlib</span> 1.6.
</p>
<p>
<a href="https://github.com/JetBrains/lets-plot-kotlin">lets-plot-kotlin</a> charting library is added,
so it will be easier to refine and create new charts in UI in the future.
</p>
<h2 class="ch_section" id="Improvements">Improvements</h2>
<h3>Thread Groups</h3>
<ul>
<li>New component: <span class="code"><a href="./usermanual/component_reference.html#Open_Model_Thread_Group">Open Model Thread Group</a></span>
</li>
</ul>
<h3>HTTP Samplers and Test Script Recorder</h3>
<ul>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65027">
Bug
65027</a>
-
Detect mime-type for files automatically when adding files to HTTP Sampler</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65020">
Bug
65020</a>
-
HTTP Sampler/Files upload tab &ndash; add missing buttons</li>
<li>
<a href="https://github.com/apache/jmeter/pull/650">
Pull request #650</a>
-
HTTP Sampler timestamp fix when exception is caught. Contributed by Konstantin Kalinin (konstantin at kkalinin.pro)</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65328">
Bug
65328</a>
-
<a href="https://github.com/apache/jmeter/pull/666">
Pull request #666</a>
-
HTTP 308 Permanent Redirect is not supported. Contributed by
Baptiste Gaillard (baptiste.gaillard at gmail.com)</li>
</ul>
<h3>Other samplers</h3>
<ul>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65149">
Bug
65149</a>
-
<a href="https://github.com/apache/jmeter/pull/644">
Pull request #644</a>
-
Encode the personal part of email addresses in SMTP Sampler</li>
<li>
<a href="https://github.com/apache/jmeter/pull/638">
Pull request #638</a>
-
Various additions to the Bolt Sampler. Added <span class="code">transaction timeout</span>, <span class="code">database</span>
option required for Neo4j 4.x (with multi-database support) and <span class="code">access mode</span> option, that allows running
against a Neo4j Enterprise Causal Cluster. Contributed by David Pecollet (david.pecollet at gmail.com)</li>
</ul>
<h3>Controllers</h3>
<ul>
<li>
<a href="https://github.com/apache/jmeter/pull/665">
Pull request #665</a>
-
Increase visible lines of code in <span class="code">IfController</span> and <span class="code">WhileController</span>.
Based on an idea by David Getzlaff (david.getzlaff at t-systems.com&gt;).</li>
</ul>
<h3>Listeners</h3>
<ul>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=64988">
Bug
64988</a>
-
Sort properties and variables in a human expected order for DebugPostProcessor and DebugSampler</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=63061">
Bug
63061</a>
-
Sort View Results in Table in a human expected order</li>
<li>
<a href="https://github.com/apache/jmeter/pull/706">
Pull request #706</a>
-
Try to keep UI responsive when displaying large text results. Can be configured with the new property
<span class="code">view.results.tree.simple_view_limit</span>
</li>
</ul>
<h3>Timers, Assertions, Config, Pre- &amp; Post-Processors</h3>
<ul>
<li>
<a href="https://github.com/apache/jmeter/pull/638">
Pull request #638</a>
-
Bolt Connection Configuration: added <span class="code">ConnectionPoolMaxSize</span> parameter. Contributed by
David Pecollet (david.pecollet at gmail.com)</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65515">
Bug
65515</a>
-
Allow pooling of Prepared Statements in JDBC</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65299">
Bug
65299</a>
-
JSONPathAssertion attributes are out of order/Compare JSON objects and
not their string representations.</li>
</ul>
<h3>Report / Dashboard</h3>
<ul>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65353">
Bug
65353</a>
-
Make the estimator used for calculating percentiles on the dashboard configurable</li>
</ul>
<h3>General</h3>
<ul>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=61805">
Bug
61805</a>
-
<a href="https://github.com/apache/jmeter/pull/663">
Pull request #663</a>
-
Add simple HTTP request template. Contributed by Ori Marko (orimarko at gmail.com)</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65611">
Bug
65611</a>
-
<a href="https://github.com/apache/jmeter/pull/673">
Pull request #673</a>
-
Add support for IPv6 addresses when specifying a remote worker node. Based on a patch by Peter Wong (peter.wong at csexperts.com)</li>
<li>Reduce memory consumption by the logging panel (disable undo events for it)</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=63620">
Bug
63620</a>
-
<a href="https://github.com/apache/jmeter/pull/694">
Pull request #694</a>
-
Fix GUI freeze when viewing response body with long line breaks</li>
<li>
<a href="https://github.com/apache/jmeter/pull/699">
Pull request #699</a>
-
Add documentation for Graphite Backend Listener. Contributed by Ji Hun (jihunkimkw at gmail.com)</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=57672">
Bug
57672</a>
-
<a href="https://github.com/apache/jmeter/pull/700">
Pull request #700</a>
-
Add a switch (<span class="code">jmeter.regex.engine</span>) to replace Oro Regex implementation by the built-in Java one.</li>
</ul>
<h2 class="ch_section" id="Non-functional changes">Non-functional changes</h2>
<ul>
<li>Added Kotlin 1.6.21 for JMeter engine implementation (apiVersion=1.5). The set of JSR 223 languages is intact.</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65128">
Bug
65128</a>
-
<a href="https://github.com/apache/jmeter/pull/643">
Pull request #643</a>
-
Add missing documentation about <span class="code">Same user on each iteration</span> for Thread Groups. Contributed by njkuzas.</li>
<li>
<a href="https://github.com/apache/jmeter/pull/648">
Pull request #648</a>
-
Updated xmlgraphics-commons to 2.6 (from 2.3). Contributed by Stefan Seide (stefan at trilobyte-se.de)</li>
<li>
<a href="https://github.com/apache/jmeter/pull/655">
Pull request #655</a>,
<a href="https://github.com/apache/jmeter/pull/667">
Pull request #667</a>,
<a href="https://github.com/apache/jmeter/pull/675">
Pull request #675</a>,
<a href="https://github.com/apache/jmeter/pull/698">
Pull request #698</a>
-
Updated x-stream to 1.4.19 (from 1.4.15). Contributed by Stefan Seide (stefan at trilobyte-se.de)</li>
<li>
<a href="https://github.com/apache/jmeter/pull/656">
Pull request #656</a>,
<a href="https://github.com/apache/jmeter/pull/668">
Pull request #668</a>
-
Updated json-smart to 2.4.8 (from 2.3), accessors-smart to 2.4.8 (from 1.2) and asm 9.3 (from 9.0). Contributed by Stefan Seide (stefan at trilobyte-se.de)</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=64831">
Bug
64831</a>
-
Log truststore entries in debug level for logger <span class="code">org.apache.jmeter.util.keystore.JmeterKeyStore</span>
</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65232">
Bug
65232</a>
-
Hide splash screen when an error is displayed because the test plan could not be parsed.</li>
<li>Updated Groovy to 3.0.11 (from 3.0.7).</li>
<li>Updated Darklaf to 2.7.3 (from 2.5.4).</li>
<li>Updated Apache ActiveMQ to 15.6.4 (from 15.6.0).</li>
<li>Updated Asm to 9.2 (from 9.1).</li>
<li>Updated Bouncycastle to 1.70 (from 1.67).</li>
<li>Updated Caffeine to 2.9.3 (from 2.8.8).</li>
<li>Updated Apache commons-dbcp2 to 2.9.0 (from 2.8.0).</li>
<li>Updated Apache commons-io to 2.11.0 (from 2.8.0).</li>
<li>Updated Apache commons-lang3 to 3.12.0 (from 3.11).</li>
<li>Updated Apache commons-net to 3.8.0 (from 3.7.2).</li>
<li>Updated Apache commons-pool2 to 2.11.1 (from 2.9.0).</li>
<li>Updated equalsverifier to 3.10 (from 3.4.2).</li>
<li>Updated Apache Freemarker to 2.3.31 (from 2.3.30).</li>
<li>Updated hsqldb to 2.5.2 (from 2.5.0).</li>
<li>Updated Apache HttpClient to 4.5.13 (from 4.5.12).</li>
<li>Updated Apache HttpCore to 4.4.15 (from 4.4.13).</li>
<li>Updated jacoco to 0.8.7 (from 0.8.5).</li>
<li>Updated json-path to 2.7.0 (from 2.4.0).</li>
<li>Updated jsoup to 1.15.1 (from 1.13.1).</li>
<li>Updated JUnit to 4.13.2 and 5.8.2 (from 4.13.1 and 5.7.0).</li>
<li>Updated Apache log4j2 to 2.17.2 (from 2.13.3).</li>
<li>Updated Miglayout to 5.3 (from 5.2).</li>
<li>Updated Neo4j Java driver to 4.4.6 (from 4.2.0).</li>
<li>Updated Objenesis to 3.2 (from 2.6).</li>
<li>Updated ktlint to 0.40.0</li>
<li>Updated PH CSS and PH commons to 6.5.4 and 10.1.6 (from 6.2.3 and 9.5.1).</li>
<li>Updated RSyntaxTextArea to 3.2.0 (from 3.1.1).</li>
<li>Updated SLF4J to 1.7.36 (from 1.7.30).</li>
<li>Updated SvgSalamander to 1.1.2.4 (from 1.1.2.1).</li>
<li>
<a href="https://github.com/apache/jmeter/pull/698">
Pull request #698</a>
-
Updated Apache Tika to 1.28.3 (from 1.26).</li>
<li>Updated WireMock-JRE8 to 2.30.0 (from 2.24.1).</li>
<li>Updated com.github.vlsi.vlsi-release-plugins 1.76 (from 1.74).</li>
<li>Updated jackson to 2.13.3 (from 2.10.5)</li>
<li>Updated jmespath to 0.5.1</li>
<li>Updated Saxon-HE to 11.2 (from 9.9.1-8)</li>
<li>Updated Apache xmlgraphics commons to 2.7 (from 2.6)</li>
<li>
<a href="https://github.com/apache/jmeter/pull/671">
Pull request #671</a>
-
Move example definition of property <span class="code">jmeter.reportgenerator.statistic_window</span>
to <span class="code">user.properties</span>, as it is read from that place.
Contributed by Rithvik Patibandla (rithvikp98 at gmail.com)</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65456">
Bug
65456</a>
-
Updated commons-jexl 3 to 3.2.1 (from 3.1). Contributed by Ori Marko (orimarko at gmail.com&gt;)</li>
<li>
<a href="https://github.com/apache/jmeter/pull/654">
Pull request #654</a>
-
Try do give better feedback while loading keystores</li>
<li>
<a href="https://github.com/apache/jmeter/pull/672">
Pull request #672</a>
-
Add more details to documentation for timeShift function. Contributed by Mariusz (mawasak at gmail.com)</li>
<li>Updated Gradle to 7.3 (from 7.2)</li>
<li>
<a href="https://github.com/apache/jmeter/pull/689">
Pull request #689</a>
-
Code clean up in StringFromFile. Contributed by Sampath Kumar Krishnasamy (sampathkumar.krishnasamykuppusamy at aexp.com)</li>
<li>
<a href="https://github.com/apache/jmeter/pull/690">
Pull request #690</a>
-
Refactor a few unit tests. Contributed by Sampath Kumar Krishnasamy (sampathkumar.krishnasamykuppusamy at aexp.com)</li>
<li>
<a href="https://github.com/apache/jmeter/pull/692>">
Pull request #692&gt;</a>
-
Fix a few deprecation warnings for Gradle. Contributed by Sampath Kumar Krishnasamy (sampathkumar.krishnasamykuppusamy at aexp.com)</li>
<li>
<a href="https://github.com/apache/jmeter/pull/697>">
Pull request #697&gt;</a>
-
Junit 5 tests to use asserts from Junit 5 API. Contributed by Sampath Kumar Krishnasamy (sampathkumar.krishnasamykuppusamy at aexp.com)</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65983">
Bug
65983</a>
-
<a href="https://github.com/apache/jmeter/pull/707">
Pull request #707</a>
-
Use current screenshot for save-to-file listener in documentation. Based on patch by NaveenKumar Namachivayam (catch.nkn at gmail.com)</li>
<li>
<a href="https://github.com/apache/jmeter/pull/708">
Pull request #708</a>
-
Make errorprone happier. Based on patch by Wilson Kurniawan (wilson at visenze.com)&gt;</li>
<li>Updated Rhino JavaScript to 1.7.14 (from 1.7.13)</li>
</ul>
<h2 class="ch_section" id="Bug fixes">Bug fixes</h2>
<h3>HTTP Samplers and Test Script Recorder</h3>
<ul>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65310">
Bug
65310</a>
-
Don't let users override <span class="code">multipart/form-data</span> <span class="code">content-type</span>
header in HC4 sampler.</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65363">
Bug
65363</a>
-
<span class="code">NullPointerException</span> in <span class="code">HTTPHC4Impl$ManagedCredentialsProvider.getAuthorizationForAuthScope</span> when <span class="code">401</span> response from remote and <span class="code">httpclient4.auth.preemptive=false</span>
</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65692">
Bug
65692</a>
-
HTTP(s) Test Script Recorder: Enable setting enabled cipher suite and enabled protocols on SSLContext/ Align SSL properties between Java and HC4 implementation</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65108">
Bug
65108</a>
-
Support JMeter variables in <a href="./usermanual/component_reference.html#HTTP_Request">GraphQL HTTP Request</a>
</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65864">
Bug
65864</a>
-
Catch <span class="code">NullPointerException</span> from JSoup when recording a test plan</li>
</ul>
<h3>Other Samplers</h3>
<ul>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65152">
Bug
65152</a>
-
OS Process Sampler &ndash; Cannot <span class="code">Add from Clipboard</span> Command parameters</li>
<li>
<a href="https://github.com/apache/jmeter/pull/638">
Pull request #638</a>
-
Bolt Sampler: fixed error displaying results when "Record Query Results" is enabled. Contributed by
David Pecollet (david.pecollet at gmail.com)</li>
</ul>
<h3>Controllers</h3>
<ul>
</ul>
<h3>Listeners</h3>
<ul>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=64962">
Bug
64962</a>
-
Save CSV sub-results recursively from View Results Tree</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65784">
Bug
65784</a>
-
No Graphs displayed in Aggregate Report/Response Time Graph</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65884">
Bug
65884</a>
-
GUI doesn't display response for multipart request <em>manually</em> encoded</li>
</ul>
<h3>Timers, Assertions, Config, Pre- &amp; Post-Processors</h3>
<ul>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65257">
Bug
65257</a>
-
JMESPathExtractor writes error log entries if JMESPath filter returns empty result</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65259">
Bug
65259</a>
-
JMESPathExtractor Attribute <span class="code">Match No.</span> Required</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65269">
Bug
65269</a>
-
JSON Extractor and JSON JMESPath Extractor ignore sub-samples</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65352">
Bug
65352</a>
-
Warning logged when Boundary Extractor doesn't find any match</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65681">
Bug
65681</a>
-
Use default values for <span class="code">null</span> values when extracting with JSONPostProcessor</li>
<li>Allow setters in ConstantThroughputTimer to update the values during run time</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65782">
Bug
65782</a>
-
Use correct message format for MessageFormat in HTMLAssertion</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65794">
Bug
65794</a>
-
JSON Assertion always successful with indefinite paths</li>
</ul>
<h3>Functions</h3>
<ul>
</ul>
<h3>I18N</h3>
<ul>
</ul>
<h3>Report / Dashboard</h3>
<ul>
</ul>
<h3>Documentation</h3>
<ul>
<li>
<a href="https://github.com/apache/jmeter/pull/658">
Pull request #658</a>
-
Improve javadoc. Contributed by Ori Marko (orimarko at gmail.com)</li>
</ul>
<h3>General</h3>
<ul>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=64318">
Bug
64318</a>
-
DNS Cache Manager &ndash; custom DNS resolver does not use system resolver by default</li>
<li>
<a href="https://github.com/apache/jmeter/pull/641">
Pull request #641</a>,
<a href="https://github.com/apache/jmeter/pull/698">
Pull request #698</a>
-
Updated xercesImpl to 2.12.2 (from 2.12.0). Based on patch by Stefan Seide (stefan at trilobyte-se.de).</li>
<li>
<a href="https://github.com/apache/jmeter/pull/645">
Pull request #645</a>
-
Add escaping for new lines in <span class="code">AbstractInfluxdbMetricsSender</span>. Contributed by David Getzlaff (david.getzlaff at t-systems.com&gt;)</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65198">
Bug
65198</a>
-
Can't copy generated function from FunctionHelper</li>
<li>
<a href="https://github.com/apache/jmeter/pull/661">
Pull request #661</a>
-
Fix wording in doc. Contributed by BugKing (wangzhen at fit2cloud.com)</li>
<li>
<a href="https://github.com/apache/jmeter/pull/664">
Pull request #664</a>
-
Allow whitespace in path. Contributed by Till Neunast (github.com/tilln)</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65270">
Bug
65270</a>
-
POST <span class="code">application/x-www-form-urlencoded</span> cURL code generated from Postman is not imported correctly</li>
<li>Silence warnings of missing font Arial on startup under Linux</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65300">
Bug
65300</a>
-
<span class="code">IllegalAccessError</span> when opening file dialog with Java 16</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65336">
Bug
65336</a>
-
Blank labels when different elements had the same name</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=65522">
Bug
65522</a>
-
Restart doesn't work, when parameters contain spaces</li>
<li>
<a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=63914">
Bug
63914</a>
-
Simplify <span class="code">:src:dist:clean</span> configuration, ensure <span class="code">/lib/junit/test.jar</span> is removed on clean</li>
<li>
<a href="https://github.com/apache/jmeter/pull/696">
Pull request #696</a>
-
Keep JSyntaxTextArea text value for use in headless mode. Contributed by Peter Paul Bakker (peter.paul.bakker at stokpop.nl)</li>
</ul>
<h2 class="ch_section" id="Thanks">Thanks</h2>
<p>We thank all contributors mentioned in bug and improvement sections above:
</p>
<ul>
<li>Stefan Seide (stefan at trilobyte-se.de)</li>
<li>njzukas (github.com/njzukas)</li>
<li>David Getzlaff (david.getzlaff at t-systems.com&gt;)</li>
<li>Konstantin Kalinin (konstantin at kkalinin.pro)</li>
<li>David Pecollet (david.pecollet at gmail.com)</li>
<li>Ori Marko (orimarko at gmail.com)</li>
<li>BugKing (wangzhen at fit2cloud.com)</li>
<li>Till Neunast (github.com/tilln)</li>
<li>Baptiste Gaillard (baptiste.gaillard at gmail.com)</li>
<li>Rithvik Patibandla (rithvikp98 at gmail.com)</li>
<li>Mariusz (mawasak at gmail.com)</li>
<li>peter.wong@csexperts.com</li>
<li>Woonsan Ko (woonsan.ko at bloomreach.com)</li>
<li>Chromico Rek (atech5122 at gmail.com)</li>
<li>Magnus Sp&aring;ngdal (magnus.spangdal as avanza.se)</li>
<li>Piotr Smietana (piotrsmietana1998 at gmail.com)</li>
<li>Sampath Kumar Krishnasamy (sampathkumar.krishnasamykuppusamy at aexp.com)</li>
<li>Ji Hun (jihunkimkw at gmail.com)</li>
<li>Peter Paul Bakker (peter.paul.bakker at stokpop.nl)</li>
<li>NaveenKumar Namachivayam (catch.nkn at gmail.com)</li>
<li>Wilson Kurniawan (wilson at visenze.com)</li>
</ul>
<p>We also thank bug reporters who helped us improve JMeter.</p>
<ul>
<li>Nikola Aleksic (nalexic at gmail.com)</li>
<li>Vladimir Rosu (rosuvladimir at gmail.com)</li>
</ul>
<p>
Apologies if we have omitted anyone else.
</p>
<h2 class="ch_section" id="Known problems and workarounds">Known problems and workarounds</h2>
<ul>
<li>The Once Only controller behaves correctly under a Thread Group or Loop Controller,
but otherwise its behaviour is not consistent (or clearly specified).</li>
<li>
The numbers that appear to the left of the green box are the number of active threads / total number of threads,
the total number of threads only applies to a locally run test, otherwise it will show <span class="code">0</span> (see <a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=55510">
Bug
55510</a>).
</li>
<li>
Note that under some windows systems you may have this WARNING:
<pre class="source">
java.util.prefs.WindowsPreferences
WARNING: Could not open/create prefs root node Software\JavaSoft\Prefs at root 0
x80000002. Windows RegCreateKeyEx(&hellip;) returned error code 5.
</pre>
The fix is to run JMeter as Administrator, it will create the registry key for you, then you can restart JMeter as a normal user and you won't have the warning anymore.
</li>
<li>
You may encounter the following error:
<pre class="source">java.security.cert.CertificateException: Certificates does not conform to algorithm constraints</pre>
if you run a HTTPS request on a web site with a SSL certificate (itself or one of SSL certificates in its chain of trust) with a signature
algorithm using MD2 (like <span class="code">md2WithRSAEncryption</span>) or with a SSL certificate with a size lower than 1024 bits.
This error is related to increased security in Java 8+.
<br>
To allow you to perform your HTTPS request, you can downgrade the security of your Java installation by editing
the Java <span class="code">jdk.certpath.disabledAlgorithms</span> property. Remove the MD2 value or the constraint on size, depending on your case.
<br>
This property is in this file:
<pre class="source">JAVA_HOME/jre/lib/security/java.security</pre>
See <a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=56357">
Bug
56357</a> for details.
</li>
<li>
Under Mac OSX Aggregate Graph will show wrong values due to mirroring effect on numbers.
This is due to a known Java bug, see Bug <a href="https://bugs.openjdk.java.net/browse/JDK-8065373">JDK-8065373</a>
The fix is to use JDK8_u45 or later.
</li>
<li>
View Results Tree may fail to display some HTML code under HTML renderer, see <a href="https://bz.apache.org/bugzilla/show_bug.cgi?id=54586">
Bug
54586</a>.
This is due to a known Java bug which fails to parse "<span class="code">px</span>" units in row/col attributes.
See Bug <a href="https://bugs.openjdk.java.net/browse/JDK-8031109">JDK-8031109</a>
The fix is to use JDK9 b65 or later.
</li>
<li>
JTable selection with keyboard (<span class="keycombo"><span class="keysym">SHIFT</span>&nbsp;+&nbsp;<span class="keysym">up/down</span></span>) is totally unusable with Java 7 on Mac OSX.
This is due to a known Java bug <a href="https://bugs.openjdk.java.net/browse/JDK-8025126">JDK-8025126</a>
The fix is to use JDK 8 b132 or later.
</li>
<li>
Since Java 11 the JavaScript implementation <a href="https://openjdk.java.net/jeps/335">Nashorn has been deprecated</a>.
Java will emit the following deprecation warnings, if you are using JavaScript based on Nashorn.
<pre class="source">
Warning: Nashorn engine is planned to be removed from a future JDK release
</pre>
To silence these warnings, add <span class="code">-Dnashorn.args=--no-deprecation-warning</span> to your Java arguments.
That can be achieved by setting the enviroment variable <span class="code">JVM_ARGS</span>
<pre class="source">
export JVM_ARGS="-Dnashorn.args=--no-deprecation-warning"
</pre>
</li>
<li>
With Java 15 the JavaScript implementation <a href="https://openjdk.java.net/jeps/372">Nashorn has been removed</a>. To add back a JSR-223 compatible JavaScript engine you have two options:
<dl>
<dt>Use Mozilla Rhino</dt>
<dd>Copy <a href="https://github.com/mozilla/rhino/releases/download/Rhino1_7_14_Release/rhino-engine-1.7.14.jar">rhino-engine-1.7.14.jar</a> into <span class="code">$JMETER_HOME/lib/ext</span>.</dd>
<dt>Use OpenJDK Nashorn</dt>
<dd>
The OpenJDK Nashorn implementation comes as a module. To use it, you will have to download it and add it to the module path. A hacky way to download the version 15.0 (or later) and its dependencies and set the module path is outlined below:
<pre class="source">
mkdir lib/modules
pushd lib/modules
wget https://repo1.maven.org/maven2/org/openjdk/nashorn/nashorn-core/15.3/nashorn-core-15.3.jar
wget https://repo1.maven.org/maven2/org/ow2/asm/asm/9.2/asm-9.2.jar
wget https://repo1.maven.org/maven2/org/ow2/asm/asm-commons/9.2/asm-commons-9.2.jar
wget https://repo1.maven.org/maven2/org/ow2/asm/asm-util/9.2/asm-util-9.2.jar
wget https://repo1.maven.org/maven2/org/ow2/asm/asm-tree/9.2/asm-tree-9.2.jar
wget https://repo1.maven.org/maven2/org/ow2/asm/asm-analysis/9.2/asm-analysis-9.2.jar
popd
export JVM_ARGS="--module-path $PWD/lib/modules"
./bin/jmeter
</pre>
</dd>
</dl>
</li>
</ul>
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