Karakun Support Forums

We are currently evaluating Java 25 compatibility with OpenWebStart for our enterprise JNLP applications.

Could you please confirm the following:

Is Java 25 officially supported by OpenWebStart?
Are there any known compatibility issues with Java 25, especially for Swing/JNLP applications?
Do you recommend any specific JVM arguments or OpenWebStart configurations for Java 25?
Are there any limitations around module access, security policies, or code-signing requirements in Java 25 compared to Java 17/21?
Has Karakun validated OpenWebStart with any specific Java 25 distributions (Zulu, etc.)?

We are planning migration testing and would appreciate any guidance or best practices from your side.

Thanks in advance.

OWS does not work with Java 23+ : please see https://github.com/karakun/OpenWebStart/issues/621.

With Java23, URLJarFileCallBack was removed and with Java 24 the SecurityManager has been removed. for the former a workaround implementation can be found but for the latter an option is to run OWS without SecurityManager (i.e without the sandbox) but this too needs a workaround fix in the code. We are looking at a solution but that requires time, effort and resources. It will help if some of the users of OWS can crowdfund or help by buying paid support: https://openwebstart.com/support.