Launch File:

<jnlp spec="1.6+" codebase="http://192.168.2.199:8080/weasis">
  <information>
    <title>Weasis</title>
    <vendor>Weasis Team</vendor>
    <description>DICOM images viewer</description>
    <description kind="short">An application to visualize and analyze
			DICOM images.</description>
    <description kind="one-line">DICOM images viewer</description>
    <description kind="tooltip">Weasis</description>
    <icon href="images/logo-button.png" kind="default"/>
    <icon href="images/about.png" kind="splash"/>
    <shortcut online="false">
      <desktop/>
      <menu submenu="Weasis"/>
    </shortcut>
  </information>
  <security>
    <all-permissions/>
  </security>
  <resources>
    <j2se version="1.6.0_10+" href="http://java.sun.com/products/autodl/j2se" initial-heap-size="128m" max-heap-size="512m"/>
    <j2se version="1.6.0_10+" initial-heap-size="128m" max-heap-size="512m"/>
    <jar href="weasis-launcher.jar" main="true"/>
    <jar href="felix.jar"/>
    <extension href="substance.jnlp"/>
    <property name="felix.config.properties" value="http://192.168.2.199:8080/weasis/conf/config.properties"/>
    <property name="weasis.codebase.url" value="http://192.168.2.199:8080/weasis"/>
    <property name="gosh.args" value="-sc telnetd -p 17179 start"/>
    <property name="apple.laf.useScreenMenuBar" value="true"/>
    <property name="weasis.i18n" value="http://192.168.2.199:8080/weasis-i18n"/>
  </resources>
  <application-desc main-class="org.weasis.launcher.WebstartLauncher">
    <argument>$dicom:get -i 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</argument>
  </application-desc>
</jnlp>


Exception:

java.lang.NullPointerException
	at java.util.Hashtable.put(Unknown Source)
	at java.util.Properties.setProperty(Unknown Source)
	at java.lang.System.setProperty(Unknown Source)
	at org.weasis.launcher.WeasisLauncher.loadProperties(WeasisLauncher.java:885)
	at org.weasis.launcher.WeasisLauncher.launch(WeasisLauncher.java:323)
	at org.weasis.launcher.WebstartLauncher.launch(WebstartLauncher.java:103)
	at org.weasis.launcher.WebstartLauncher.main(WebstartLauncher.java:107)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at com.sun.javaws.Launcher.executeApplication(Unknown Source)
	at com.sun.javaws.Launcher.executeMainClass(Unknown Source)
	at com.sun.javaws.Launcher.doLaunchApp(Unknown Source)
	at com.sun.javaws.Launcher.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)