Jean-Marie Mariotti Center

Technical informations to use our Java applications

The following informations try to help the configuration of end-user desktops. Feel free to contact to get more support on these points.

What is required to run our Java applications

Since april 2013, Java 1.6 is the minimum version required by JMMC applications but it is no more supported by Sun (end of life) for several years. We encourage our users to upgrade Java 1.7 if possible.

They are distributed using Java Web Start. Distribution is made through http protocol and should work if you can read this page. Each Java application is signed to allow the use of these applications as normal desktop ones. Signed applications not only allow network connection with the server that hosts the WebStart but allow any other web access, local disk access...
However signed applications imply to trust us and tell security manager to authorize the application before running.

Most of the machines already have Java enabled and well configured Please read next sections if you get some problem running our JMMC applications.

How to set up Java on your machine

You need to install the Java Runtime Environment (JRE) which allows end-users to run Java applications.

Please visit to start installation. This website also provides information about Java Web Start.

How to set up Java WebStart mechanism

Your browser needs to associate the jnlp file extension with the javaws program (located into your Java Runtime Environment). You will find proper information in the WebStart faq entry.

The javaws command can also be used to launch a Java WebStart application.

How to get javaws command if it is not provided by JRE

You need to get netx.jar file from and build a shell command that just run :

java -jar YOURPATH/netx.jar -jnlp $*

Then you can associate this command to jnlp file into your browser or type the command in a shell.

How to set up network configurations

Most of our applications use network to take advantage of distributed services. If all does not go straight forward, this requires to have a view on some special configuration points:

If you require to use a proxy

Java WebStart provides a setup-panel to control the proxy configuration. If you use a SUN implementation of Java just call javaws (javaws -viewer or ControlPanel) command and fill the network properties of the preference panel with the information given by your network administrator.

Java 1.5 also has configuration files to manage network configuration. General configuration should be done by modifying $JAVA_HOME/jre/lib/ file.

Most of applications also handle following properties:

java -Dhttp.proxyHost=<HTTP_PROXY_HOST> -Dhttp.proxyPort=<HTTP_PROXY_PORT> <your.jar>

If you suspect some firewall problems

The best thing you should do is to contact your local administrator and ask him his point of view. For information, one of the known problems which often occurs concerns some specific applications:

How to set up memory with jar files

To define the memory usage of the java program, your can use following option :

e.g: java -Xms256m -Xmx512m -jar Aspro2.jar

As of January 2014, JMMC applications are signed with a trusted certificate.

JMMC applications are now signed with a trusted certificates from "Universite Grenoble I Joseph Fourier". This should help deployement process and you shoud get a request to launch our applications as shown in the following screenshot:

Warning : If you don't see the same message under Mac OS X, it is probably due to a 10.9 Mavericks known bug occuring behind proxies. Please clean up your certificate cache as mentioned in step 4 of the response to the bug to resolve this issue.

Before January 2014. How to fix security level and run 'not yet signed' java applications

In the latest releases of java, every application that have not been signed with a commercial code signing certificate will always prompt the user to accept the risk and want to run this application.
We will buy and sign our java applications in a near future. Before deployement, please check the checkbox as below:

You may also encounter the message Application blocked by security settings

Please move the security level to High and try again. Get more information onto the dedicated help page for adjusting the security level.