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Asked: 2026-06-10T21:49:49+00:00

I need to set java.net.preferIPv4Stack=true to an app started via JNLP (javaws and applet)

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I need to set java.net.preferIPv4Stack=true to an app started via JNLP (javaws and applet)

Tried those, without luck…

<j2se ...java-vm-args="-Djava.net.preferIPv4Stack=true" />
<property name="java.net.preferIPv4Stack" value="true"/>
System.setProperty("java.net.preferIPv4Stack", "true");

The only way i could make it work was seeting when launching javaws from local filesystem:

javaws -J-Djava.net.preferIPv4Stack=true myapp.jnlp

What is not possible on a applet or URL.

How should i set this property?

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1 Answer

  1. Editorial Team

    With the Java 7 Update 6 (b17) the list of secure properties has been updated. See Bug Report 716069 for further Details.

    You can include this setting by specifying the following line within the resource tag:

    <property name="java.net.preferIPv4Stack" value="true"/>

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