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Hello everyone, With “Custom Scheduler Prototype v2”, the JDK loads the class specified by jdk. virtualThreadScheduler. implClass via the internal AppClassLoader. This works for typical apps, but fails for Spring Boot fat JARs where the application</div>
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<p class="gmail-p1">Hello everyone,</p>
<p class="gmail-p1">With “Custom Scheduler Prototype v2”, the JDK loads the class specified by <span class="gmail-s1">jdk.virtualThreadScheduler.implClass</span> via the internal AppClassLoader. This works for typical apps, but fails for Spring Boot fat JARs where the application class loader is often <span class="gmail-s1">org.springframework.boot.loader.launch.LaunchedClassLoader</span>, resulting in:</p><p class="gmail-p1"><br></p><p class="gmail-p1">``` text</p><p class="gmail-p1">Exception in thread "main" java.lang.reflect.InvocationTargetException<br> at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:119)<br> at java.base/java.lang.reflect.Method.invoke(Method.java:565)<br> at org.springframework.boot.loader.launch.Launcher.launch(Launcher.java:106)<br> at org.springframework.boot.loader.launch.Launcher.launch(Launcher.java:64)<br> at org.springframework.boot.loader.launch.JarLauncher.main(JarLauncher.java:40)<br>Caused by: java.lang.Error: java.lang.ClassNotFoundException: io.github.dreamlike.springvirtualthread.CustomerVirtualThreadScheduler<br> at java.base/java.lang.VirtualThread.loadCustomScheduler(VirtualThread.java:1511)<br> at java.base/java.lang.VirtualThread.<clinit>(VirtualThread.java:84)<br> at java.base/java.lang.ThreadBuilders.newVirtualThread(ThreadBuilders.java:403)<br> at java.base/java.lang.ThreadBuilders.newVirtualThread(ThreadBuilders.java:412)<br> at java.base/java.lang.Thread.startVirtualThread(Thread.java:1631)<br> at io.github.dreamlike.springvirtualthread.SpringVirtualThreadApplication.main(SpringVirtualThreadApplication.java:13)<br> at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)<br> ... 4 more<br>Caused by: java.lang.ClassNotFoundException: io.github.dreamlike.springvirtualthread.CustomerVirtualThreadScheduler<br> at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:580)<br> at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:502)<br> at java.base/java.lang.Class.forName0(Native Method)<br> at java.base/java.lang.Class.forName(Class.java:560)<br> at java.base/java.lang.VirtualThread.loadCustomScheduler(VirtualThread.java:1500)<br> ... 10 more<br></p><p class="gmail-p1">```</p><p class="gmail-p1">
</p><p class="gmail-p1">Would it be feasible to switch to an SPI (similar to JDBC) so custom schedulers are pluggable under non-standard class loaders? Potentially the same approach could apply to a pluggable Poller API.</p><p class="gmail-p1">Thanks for any guidance or discussion.</p><p class="gmail-p2"><br></p><p class="gmail-p1">Best regards,</p><p class="gmail-p1">
</p><p class="gmail-p1">Mengyang Li</p></div>