How to solve the "Form too large" error in Jetty?
Version 6.1 by Sebastian Klipper on 2024/12/27
This happens because Jetty has a default size for accepting POST data, which can be customized.
If you're using the XWiki Zip distribution, you can edit XWIKI_INSTALL_DIR/jetty/etc/jetty.xml and/or XWIKI_INSTALL_DIR/jetty/etc/jetty-ee8-web.xml and locate the following configuration:
<!-- In order to avoid getting a "java.lang.IllegalStateException: Form too large" error when editing large page in
XWiki we need to tell Jetty to allow for large content since by default it only allows for 20K. We do this by
passing the "org.eclipse.jetty.server.Request.maxFormContentSize" attribute.
Note that setting this value too high can leave your server vulnerable to denial of service attacks.
-->
<Call name="setAttribute">
<Arg>org.eclipse.jetty.server.Request.maxFormContentSize</Arg>
<Arg><Property name="jetty.maxFormContentSize" default="1000000"/></Arg>
</Call>
XWiki we need to tell Jetty to allow for large content since by default it only allows for 20K. We do this by
passing the "org.eclipse.jetty.server.Request.maxFormContentSize" attribute.
Note that setting this value too high can leave your server vulnerable to denial of service attacks.
-->
<Call name="setAttribute">
<Arg>org.eclipse.jetty.server.Request.maxFormContentSize</Arg>
<Arg><Property name="jetty.maxFormContentSize" default="1000000"/></Arg>
</Call>
If you're using a different distribution you can simply set the JVM System Property org.eclipse.jetty.server.Request.maxFormContentSize to the value you wish (e.g. -Dorg.eclipse.jetty.server.Request.maxFormContentSize=1000000). You should set this in the JVM options you use when starting the Servlet Container in which XWiki is deployed.
