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2 years ago To best understand what is happening you must turn on debug logging to file.
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Am 20. Januar 2022 22:26:01 MEZ schrieb frankzha2019 @.***>:
Hi,
We have a Java GUI application running on Windows 10. The application is launched via a jnlp file. Inside the application, the user is also able to launch multiple other components of the application in separate JVMs using the jnlp file. The application has been running great for years using Java 8 and JavaWebStart (JWS).
Recently, we were migrating from Java 8 to Java 11 and beyond. Because JWS is no longer supported in Java 11, we tried to replace it with OpenWebStart (OWS) 1.5.0.
Initially, I launched the main GUI via the jnlp file and checked all the features and cache content. The features were working fine, and I was able to locate all the jars mentioned in the jnlp file in different numbered folders under C:\Users\UserName.cache\icedtea-web\cache. However, when I opened a saved workspace in the main GUI app and launched multiple components in separate JVMs using the same jnlp file, I noticed that OWS was much slower in launching the JVMs than JWS.
I assumed that after the jnlp and jar files were downloaded and saved in cache, OWS didn't need to download them anymore. However, I noticed that each time the jnlp file was opened/loaded, the "download progress dialogs" of OWS appeared, as if the OWS was downloading the files again.
Under C:\Users\UserName.cache\icedtea-web\cache, there is a file called "recently_used.cache". It's a text file. In the file, there is detailed info regarding when the resources are downloaded and when they are used.
Based on the info in "recently_used.cache", it appeared that the jnlp file and the jars for the application were only downloaded once and used many times later. However, the "download progress" dialog seemed to tell us a different story.
A couple of times out of a few dozen or so of my tests, I also encountered some "ClassNotFound" exceptions, as if the OWS couldn't find the jars. But the cache content was still the same and nothing had been modified. Even with these exceptions, the OWS still seemed to be able to launch the other components in separate JVMs in the end after the long delay, as if it was trying the second time after the first try failed.
I also encountered once a pop-up error message "No Suitable JVM was found to start the application". Again, it didn't seem to prevent the OWS from launching the components in separate JVMs in the end.
Could someone help? Thanks.
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frankzha2019
Hi,
We have a Java GUI application running on Windows 10. The application is launched via a jnlp file. Inside the application, the user is also able to launch multiple other components of the application in separate JVMs using the jnlp file. The application has been running great for years using Java 8 and JavaWebStart (JWS).
Recently, we were migrating from Java 8 to Java 11 and beyond. Because JWS is no longer supported in Java 11, we tried to replace it with OpenWebStart (OWS) 1.5.0.
Initially, I launched the main GUI via the jnlp file and checked all the features and cache content. The features were working fine, and I was able to locate all the jars mentioned in the jnlp file in different numbered folders under C:\Users\UserName.cache\icedtea-web\cache. However, when I opened a saved workspace in the main GUI app and launched multiple components in separate JVMs using the same jnlp file, I noticed that OWS was much slower in launching the JVMs than JWS.
I assumed that after the jnlp and jar files were downloaded and saved in cache, OWS didn't need to download them anymore. However, I noticed that each time the jnlp file was opened/loaded, the "download progress dialogs" of OWS appeared, as if the OWS was downloading the files again.
Under C:\Users\UserName.cache\icedtea-web\cache, there is a file called "recently_used.cache". It's a text file. In the file, there is detailed info regarding when the resources are downloaded and when they are used.
Based on the info in "recently_used.cache", it appeared that the jnlp file and the jars for the application were only downloaded once and used many times later. However, the "download progress" dialog seemed to tell us a different story.
A couple of times out of a few dozen or so of my tests, I also encountered some "ClassNotFound" exceptions, as if the OWS couldn't find the jars. But the cache content was still the same and nothing had been modified. Even with these exceptions, the OWS still seemed to be able to launch the other components in separate JVMs in the end after the long delay, as if it was trying the second time after the first try failed.
I also encountered once a pop-up error message "No Suitable JVM was found to start the application". Again, it didn't seem to prevent the OWS from launching the components in separate JVMs in the end.
Could someone help? Thanks.