java-web-start

I need to prevent users from starting my Java application (WebStart Swing app) multiple times. So if the application is already running it shouldn't be possible to start it again or show a warning / be closed again. Is there some convenient way to achieve this? I thought about blocking a port or write sth to a file. But hopefully you can access some system properties or the JVM? btw. target platform is Windows XP with Java 1.5 I think your suggestion of opening a port to listen when you start your application is the best idea. It's very easy to do and you don't need to worry about cleaning it

Recently security vulnerabilities were discovered in the Java Plug-In 1 . As a protection for the end user, Java in most browsers was disabled promptly. What do the 'Java disabled' warnings look like? Does the blocking of applets also affect Java Web Start apps. (they are launched from a link in a web page) aimed at desktop use? Security vulnerability in the Oracle Java Plug-In. For more details see: The JRE 1.7 Vulnerability Q&A at SO. Oracle Security Alert for CVE-2013-0422 The Java™ SE Development Kit 7, Update 11 (JDK 7u11) release notes - the version in which the vulnerability was fixed.

We run the application from the attached JNLP. On the Java console, we have output the system properties with D. The properties from our JNLP files are not set any more. This is the first Java version that we get this sort of problems with. Everything was working fine up to and including 7 Update 40. We have all the jars signed but there are no security attributes in their manifests. <?xml version="1.0" encoding="UTF-8"?> <jnlp spec="1.0+" codebase="http://10.0.10.230/webstart/app" href="desktop.jnlp"> <information> <title>MyApp Desktop</title> <vendor>MyApp GmbH</vendor> <homepage href="http: