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vevent"><caption class="infobox-title summary">JWt</caption><tbody><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Programmer" title="Programmer">Original author(s)</a></th><td class="infobox-data"><a href="/w/index.php?title=Emweb&action=edit&redlink=1" class="new" title="Emweb (page does not exist)">Emweb</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Initial release</th><td class="infobox-data">1.0.0 / December 2005<span class="noprint">; 18 years ago</span><span style="display:none"> (<span class="bday dtstart published updated">2005-12</span>)</span></td></tr><tr style="display: none;"><td colspan="2" class="infobox-full-data"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1257001546"></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_release_life_cycle" title="Software release life cycle">Stable release</a></th><td class="infobox-data"><div style="margin:0px;">4.11.1<sup id="cite_ref-wikidata-dbbcbf3fa897a803b512f2d0c9111dc383ea7bee-v18_1-0" class="reference"><a href="#cite_note-wikidata-dbbcbf3fa897a803b512f2d0c9111dc383ea7bee-v18-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> <span class="mw-valign-text-top" typeof="mw:File/Frameless"><a href="https://www.wikidata.org/wiki/Q17061295?uselang=en#P348" title="Edit this on Wikidata"><img alt="Edit this on Wikidata" src="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png" decoding="async" width="10" height="10" class="mw-file-element" srcset="//upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/15px-OOjs_UI_icon_edit-ltr-progressive.svg.png 1.5x, //upload.wikimedia.org/wikipedia/en/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/20px-OOjs_UI_icon_edit-ltr-progressive.svg.png 2x" data-file-width="20" data-file-height="20" /></a></span> / 2024-11-05; 19 days ago</div></td></tr><tr style="display:none"><td colspan="2"> </td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Repository_(version_control)" title="Repository (version control)">Repository</a></th><td class="infobox-data"><span class="url"><a rel="nofollow" class="external text" href="https://github.com/emweb/jwt">github<wbr />.com<wbr />/emweb<wbr />/jwt</a></span></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Written in</th><td class="infobox-data"><a href="/wiki/Java_(programming_language)" title="Java (programming language)">Java</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Operating_system" title="Operating system">Operating system</a></th><td class="infobox-data"><a href="/wiki/Cross-platform" class="mw-redirect" title="Cross-platform">Cross-platform</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_categories#Categorization_approaches" title="Software categories">Type</a></th><td class="infobox-data"><a href="/wiki/Web_framework" title="Web framework">Web framework</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;"><a href="/wiki/Software_license" title="Software license">License</a></th><td class="infobox-data">Dual License: <a href="/wiki/GNU_General_Public_License" title="GNU General Public License">GNU General Public License</a> or <a rel="nofollow" class="external text" href="http://www.webtoolkit.eu/jwt/download">Commercial License</a></td></tr><tr><th scope="row" class="infobox-label" style="white-space: nowrap;">Website</th><td class="infobox-data"><span class="url"><a rel="nofollow" class="external text" href="https://www.webtoolkit.eu/jwt">www<wbr />.webtoolkit<wbr />.eu<wbr />/jwt</a></span></td></tr></tbody></table> <p><b>JWt</b> (pronounced "jay-witty") is an <a href="/wiki/Open-source_software" title="Open-source software">open-source</a> <a href="/wiki/GUI_widget" class="mw-redirect" title="GUI widget">widget</a>-centric <a href="/wiki/Web_application_framework" class="mw-redirect" title="Web application framework">web application framework</a> for the <a href="/wiki/Java_(programming_language)" title="Java (programming language)">Java programming language</a> developed by <a href="/w/index.php?title=Emweb&action=edit&redlink=1" class="new" title="Emweb (page does not exist)">Emweb</a>. It has an API that uses established GUI application development patterns. The programming model is component-based and <a href="/wiki/Event-driven_programming" title="Event-driven programming">event-driven</a>, similar to <a href="/wiki/Swing_(Java)" title="Swing (Java)">Swing</a>. </p><p>The goal of the library is to benefit from the stateful component model used in desktop applications APIs, applied to web development, instead of the traditional <a href="/wiki/Model%E2%80%93view%E2%80%93controller" title="Model–view–controller">model–view–controller</a> (MVC) model. Rather than using MVC at the level of a page, MVC is pushed to the level of individual components. </p><p>While the library uses a desktop application development model, it does support web-specific features including <a href="/wiki/Semantic_URL" class="mw-redirect" title="Semantic URL">semantic URLs</a>, browser history navigation support, internationalization, themes, and styling. </p><p>A unique feature of the library is its abstraction layer of the browser rendering model. The library uses <a href="/wiki/Ajax_(programming)" title="Ajax (programming)">Ajax</a> for communicating with Ajax-capable browsers, while using plain HTML form post-backs for other user agents (for accessibility and search engines). Using a progressive bootstrap method, the user interface is initially rendered as plain HTML, and for Ajax-capable browsers, it is automatically upgraded to use Ajax for increased interactivity. </p><p>JWt is distributed as a jar file. A JWt application is a war file that is deployed in a standards-compliant <a href="/wiki/Servlet_container" class="mw-redirect" title="Servlet container">servlet container</a>. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="Major_features">Major features</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=JWt_(Java_web_toolkit)&action=edit&section=1" title="Edit section: Major features"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>See the feature list on the project homepage for a more detailed overview.<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p> <ul><li>Automatic <a href="/wiki/Graceful_degradation" class="mw-redirect" title="Graceful degradation">graceful degradation</a> and <a href="/wiki/Progressive_enhancement" title="Progressive enhancement">progressive enhancement</a></li> <li>On all modern browsers, a JWt application is a <a href="/wiki/Single-page_application" title="Single-page application">single-page application</a>, with full support for forward/back and bookmark navigation, but still fully <a href="/wiki/SEO" class="mw-redirect" title="SEO">SEO</a>.</li> <li>Supports server-initiated events (<a href="/wiki/Comet_(programming)" title="Comet (programming)">Comet</a>), and uses <a href="/wiki/Asynchronous_I/O" title="Asynchronous I/O">asynchronous I/O</a> when deployed within a Servlet 3.0 container.</li> <li>A unified 2D rendering API (SVG/HTML5 canvas/VML/PDF) with java.awt.Graphics2D compatibility</li> <li>Integrated <a href="/wiki/PDF" title="PDF">PDF</a> rendering for Widgets, Graphics (Charts) and HTML/CSS, to generate reports</li> <li>Both client-side and server-side validation</li> <li>Various automatic built-in security features to avoid <a href="/wiki/Cross-site_scripting" title="Cross-site scripting">cross-site scripting</a> and <a href="/wiki/CSRF" class="mw-redirect" title="CSRF">CSRF</a> vulnerabilities.</li> <li>Theme support through CSS or <a href="/wiki/Bootstrap_(front-end_framework)" title="Bootstrap (front-end framework)">Bootstrap</a></li> <li>Available widgets are demonstrated in the <a rel="nofollow" class="external text" href="http://jwt.emweb.be/jwt-gallery/gallery">widget gallery</a></li> <li>A 3D painting API for WebGL rendering, with fallback to server-side GPU accelerated rendering</li> <li>A 3D chart API (surfaces, points, bar charts, ...) supporting selection, intersection highlighting, height maps, isolines, ...</li></ul> <div class="mw-heading mw-heading2"><h2 id="Code_example">Code example</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=JWt_(Java_web_toolkit)&action=edit&section=2" title="Edit section: Code example"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>The Hello World!<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> example full source code<sup id="cite_ref-4" class="reference"><a href="#cite_note-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-highlight mw-highlight-lang-java mw-content-ltr" dir="ltr"><pre><span></span><span class="cm">/*</span> <span class="cm"> * A simple hello world application class which demonstrates how to react</span> <span class="cm"> * to events, read input, and give feed-back.</span> <span class="cm"> */</span> <span class="kd">public</span><span class="w"> </span><span class="kd">class</span> <span class="nc">HelloApplication</span><span class="w"> </span><span class="kd">extends</span><span class="w"> </span><span class="n">WApplication</span><span class="w"> </span><span class="p">{</span> <span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="nf">HelloApplication</span><span class="p">(</span><span class="n">WEnvironment</span><span class="w"> </span><span class="n">env</span><span class="p">)</span><span class="w"> </span><span class="p">{</span> <span class="w"> </span><span class="kd">super</span><span class="p">(</span><span class="n">env</span><span class="p">);</span> <span class="w"> </span> <span class="w"> </span><span class="n">setTitle</span><span class="p">(</span><span class="s">"Hello world"</span><span class="p">);</span> <span class="w"> </span><span class="n">getRoot</span><span class="p">().</span><span class="na">addWidget</span><span class="p">(</span><span class="k">new</span><span class="w"> </span><span class="n">WText</span><span class="p">(</span><span class="s">"Your name, please ? "</span><span class="p">));</span> <span class="w"> </span><span class="kd">final</span><span class="w"> </span><span class="n">WLineEdit</span><span class="w"> </span><span class="n">nameEdit</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">WLineEdit</span><span class="p">(</span><span class="n">getRoot</span><span class="p">());</span> <span class="w"> </span><span class="n">nameEdit</span><span class="p">.</span><span class="na">setFocus</span><span class="p">();</span> <span class="w"> </span><span class="n">WPushButton</span><span class="w"> </span><span class="n">button</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">WPushButton</span><span class="p">(</span><span class="s">"Greet me."</span><span class="p">,</span><span class="w"> </span><span class="n">getRoot</span><span class="p">());</span> <span class="w"> </span><span class="n">button</span><span class="p">.</span><span class="na">setMargin</span><span class="p">(</span><span class="mi">5</span><span class="p">,</span><span class="w"> </span><span class="n">Side</span><span class="p">.</span><span class="na">Left</span><span class="p">);</span> <span class="w"> </span><span class="n">getRoot</span><span class="p">().</span><span class="na">addWidget</span><span class="p">(</span><span class="k">new</span><span class="w"> </span><span class="n">WBreak</span><span class="p">());</span> <span class="w"> </span><span class="kd">final</span><span class="w"> </span><span class="n">WText</span><span class="w"> </span><span class="n">greeting</span><span class="w"> </span><span class="o">=</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">WText</span><span class="p">(</span><span class="n">getRoot</span><span class="p">());</span> <span class="w"> </span><span class="n">button</span><span class="p">.</span><span class="na">clicked</span><span class="p">().</span><span class="na">addListener</span><span class="p">(</span><span class="k">this</span><span class="p">,</span><span class="w"> </span><span class="k">new</span><span class="w"> </span><span class="n">Signal</span><span class="p">.</span><span class="na">Listener</span><span class="p">()</span><span class="w"> </span><span class="p">{</span> <span class="w"> </span><span class="kd">public</span><span class="w"> </span><span class="kt">void</span><span class="w"> </span><span class="nf">trigger</span><span class="p">()</span><span class="w"> </span><span class="p">{</span> <span class="w"> </span><span class="n">greeting</span><span class="p">.</span><span class="na">setText</span><span class="p">(</span><span class="s">"Hello there, "</span><span class="w"> </span><span class="o">+</span><span class="w"> </span><span class="n">nameEdit</span><span class="p">.</span><span class="na">getText</span><span class="p">());</span> <span class="w"> </span><span class="p">}</span> <span class="w"> </span><span class="p">});</span> <span class="w"> </span><span class="p">}</span> <span class="p">}</span> </pre></div> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=JWt_(Java_web_toolkit)&action=edit&section=3" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239009302">.mw-parser-output .portalbox{padding:0;margin:0.5em 0;display:table;box-sizing:border-box;max-width:175px;list-style:none}.mw-parser-output .portalborder{border:1px solid var(--border-color-base,#a2a9b1);padding:0.1em;background:var(--background-color-neutral-subtle,#f8f9fa)}.mw-parser-output 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srcset="//upload.wikimedia.org/wikipedia/commons/thumb/3/31/Free_and_open-source_software_logo_%282009%29.svg/42px-Free_and_open-source_software_logo_%282009%29.svg.png 1.5x, //upload.wikimedia.org/wikipedia/commons/thumb/3/31/Free_and_open-source_software_logo_%282009%29.svg/56px-Free_and_open-source_software_logo_%282009%29.svg.png 2x" data-file-width="512" data-file-height="512" /></span></span></span><span class="portalbox-link"><a href="/wiki/Portal:Free_and_open-source_software" title="Portal:Free and open-source software">Free and open-source software portal</a></span></li></ul> <ul><li><a href="/wiki/Comparison_of_server-side_web_frameworks" title="Comparison of server-side web frameworks">Comparison of web frameworks</a></li> <li><a href="/wiki/Wt_(web_toolkit)" title="Wt (web toolkit)">Wt</a>, the C++ project from which JWt is derived</li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span 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.cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://github.com/emweb/jwt/releases/tag/4.11.1">"Release 4.11.1"</a>. 5 November 2024<span class="reference-accessdate">. Retrieved <span class="nowrap">23 November</span> 2024</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=Release+4.11.1&rft.date=2024-11-05&rft_id=https%3A%2F%2Fgithub.com%2Femweb%2Fjwt%2Freleases%2Ftag%2F4.11.1&rfr_id=info%3Asid%2Fen.wikipedia.org%3AJWt+%28Java+web+toolkit%29" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.webtoolkit.eu/jwt/features">"JWt, Java Web Toolkit — Emweb"</a>. <i>www.webtoolkit.eu</i><span class="reference-accessdate">. Retrieved <span class="nowrap">27 October</span> 2019</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.webtoolkit.eu&rft.atitle=JWt%2C+Java+Web+Toolkit+%E2%80%94+Emweb&rft_id=http%3A%2F%2Fwww.webtoolkit.eu%2Fjwt%2Ffeatures&rfr_id=info%3Asid%2Fen.wikipedia.org%3AJWt+%28Java+web+toolkit%29" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.webtoolkit.eu/jwt/examples/">"JWt, Java Web Toolkit — Emweb"</a>. <i>www.webtoolkit.eu</i><span class="reference-accessdate">. Retrieved <span class="nowrap">27 October</span> 2019</span>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=www.webtoolkit.eu&rft.atitle=JWt%2C+Java+Web+Toolkit+%E2%80%94+Emweb&rft_id=http%3A%2F%2Fwww.webtoolkit.eu%2Fjwt%2Fexamples%2F&rfr_id=info%3Asid%2Fen.wikipedia.org%3AJWt+%28Java+web+toolkit%29" class="Z3988"></span></span> </li> <li id="cite_note-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-4">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222"><cite class="citation web cs1"><a rel="nofollow" class="external text" href="http://www.webtoolkit.eu/jwt/src/hello">"SOURCE CODE OF THE HELLO WORLD EXAMPLE"</a>. <i>www.webtoolkit.eu</i>.</cite><span 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