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Re: [jetty-users] Understanding Property tag use


On Sat, Apr 13, 2019 at 9:22 PM Peter Boughton <jetty@xxxxxxxxxxxxxxxxx> wrote:
> I'm trying to understand the relationship between start.ini parameters and the <Property> tag.
> What I thought was the case (and this is backed up by the `start.jar --help` text) is that any a=b lines in start.ini can be referred to from an XML config file as <Property name="a" /> to use "b" in that value.
> An example being jetty.http.port which can be set in start.ini and appears to pass the value through in jetty-http.xml with:
>         <Set name="port"><Property name="jetty.http.port" deprecated="jetty.port" default="8080" /></Set>
> However, when trying to use the same in WebAppContext with resourceBase, I get the default (not the ini value):
>         <Set name="resourceBase"><Property name="jetty.http.port" deprecated="jetty.port" default="8080" />/path</Set>
> Likewise, setting in start.ini the following property is replaced by the string "null" (or the default if one is added), instead of the expected "something":
>         <Set name="resourceBase"><Property name="" />/path</Set>
> If I use and switch from Property to SystemProperty tag it works as expected.
> If I use Property tag with name="jetty.base" it also resolves as expected.
> The documentation at says that the Property tag is for .properties files, but doing `echo "" >` and passing the file to start.jar still ends up with null/default. (However, adding jetty.http.port to does change the port.)
> So, can anyone explain what I'm missing?

If you want to modify an existing Jetty XML file, you need to copy it
from $JETTY_HOME/etc to $JETTY_BASE/etc and then modify the
$JETTY_BASE/etc XML file.
Of course, for that XML file to be considered, the correspondent
module should be enabled.

If you are writing a custom module, then your custom XML file needs to
be in $JETTY_BASE/etc.

If you have done the above and does not work, then seems like a bug.
If that's the case, please open an issue at

Simone Bordet
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from the Jetty & CometD experts.

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