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This article will talk about setting the system properties in JBoss AS7+

To understand the potential files where the system properties can be configured,  please refer to AS7 Admin Guide.

https://docs.jboss.org/author/display/AS7/Admin+Guide#AdminGuide-SystemProperties

In the Standalone mode,  the change will go into standalone.xml

In the Domain mode, the change will go into domain.xml

Add it to the system-properties  element right after the extensions element.

<server name="xyz.home" xmlns="urn:jboss:domain:1.0">
    <extensions>
        <extension module="org.jboss.as.clustering.infinispan"/>
        <extension module="org.jboss.as.clustering.jgroups"/>
        <extension module="org.jboss.as.connector"/> 
        ....
        <extension module="org.torquebox.web"/>
    </extensions>
    <system-properties>
        <property name="org.apache.tomcat.util.http.ServerCookie.FWD_SLASH_IS_SEPARATOR" value="false"/>
    </system-properties>

Adding and reading system property using CLI

For standalone mode:

$ ./bin/jboss-admin.sh --connect controller=IP_ADDRESS
[standalone@IP_ADDRESS:9999 /] /system-property=foo:add(value=bar)
[standalone@IP_ADDRESS:9999 /] /system-property=foo:read-resource
{
    "outcome" => "success",
    "result" => {"value" => "bar"}
}

For domain mode the same commands are used, you can specify system properties for:

• all hosts and instances in domain

[domain@IP_ADDRESS:9999 /] /system-property=foo:add(value=bar)

• host and its instances

[domain@IP_ADDRESS:9999 /] /host=master/system-property=foo:add(value=bar)

• just one instance

[domain@IP_ADDRESS:9999 /] /host=master/server-config=server-one/system-property=foo:add(value=bar)

Reference

http://community.jboss.org/wiki/JBossAS7HowDoI