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Programmatically Get Tomcat8 HTTP Connector's MaxPostSize In A JSP

- 1 answer

I am using Tomcat 8 and would like to be able to retrieve the maxPostSize (defined in the HTTP Connector in server.xml) programmatically from within a JSP so that I can know what the max file upload size is.

Is there a way to get this?

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Answer

You can use JMX to access the Connector MBeans locally and retrieve the value you need. You will need to know the port your Tomcat is running on.

An example:

private static int getMaxPostSize(int httpPort) throws Exception {
    MBeanServer mbeanServer = ManagementFactory.getPlatformMBeanServer();
    ObjectName objectName = new ObjectName("Catalina:type=Connector,port=" + httpPort);
    return (int) mbeanServer.getAttribute(objectName, "maxPostSize");
}
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source: stackoverflow.com
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