For example if vaadin-cdi happen to be present in classpath VaadinQuarkusProcessor finds CdiVaadinServlet and assumes it's an user provided VaadinServlet with build failing with confusing NPE.
java.lang.RuntimeException: io.quarkus.builder.BuildException: Build failure: Build failed due to errors
[error]: Build step com.vaadin.quarkus.deployment.VaadinQuarkusProcessor#mapVaadinServletPaths threw an exception: java.lang.NullPointerException: Cannot invoke "org.jboss.jandex.AnnotationInstance.value(String)" because "webServletInstance" is null
at com.vaadin.quarkus.deployment.VaadinQuarkusProcessor.registerUserServlets(VaadinQuarkusProcessor.java:231)
at com.vaadin.quarkus.deployment.VaadinQuarkusProcessor.mapVaadinServletPaths(VaadinQuarkusProcessor.java:127)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at io.quarkus.deployment.ExtensionLoader$3.execute(ExtensionLoader.java:925)
at io.quarkus.builder.BuildContext.run(BuildContext.java:277)
at org.jboss.threads.ContextHandler$1.runWith(ContextHandler.java:18)
at org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2449)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1478)
at java.base/java.lang.Thread.run(Thread.java:833)
at org.jboss.threads.JBossThread.run(JBossThread.java:501)
at io.quarkus.runner.bootstrap.AugmentActionImpl.runAugment(AugmentActionImpl.java:330)
at io.quarkus.runner.bootstrap.AugmentActionImpl.reloadExistingApplication(AugmentActionImpl.java:265)
at io.quarkus.runner.bootstrap.AugmentActionImpl.reloadExistingApplication(AugmentActionImpl.java:60)
at io.quarkus.deployment.dev.IsolatedDevModeMain.restartApp(IsolatedDevModeMain.java:251)
at io.quarkus.deployment.dev.IsolatedDevModeMain.restartCallback(IsolatedDevModeMain.java:234)
at io.quarkus.deployment.dev.RuntimeUpdatesProcessor.doScan(RuntimeUpdatesProcessor.java:536)
at io.quarkus.deployment.dev.RuntimeUpdatesProcessor.doScan(RuntimeUpdatesProcessor.java:436)
at io.quarkus.vertx.http.runtime.devmode.VertxHttpHotReplacementSetup$4.handle(VertxHttpHotReplacementSetup.java:152)
at io.quarkus.vertx.http.runtime.devmode.VertxHttpHotReplacementSetup$4.handle(VertxHttpHotReplacementSetup.java:139)
at io.vertx.core.impl.ContextImpl.lambda$null$0(ContextImpl.java:159)
at io.vertx.core.impl.AbstractContext.dispatch(AbstractContext.java:100)
at io.vertx.core.impl.ContextImpl.lambda$executeBlocking$1(ContextImpl.java:157)
at org.jboss.threads.ContextHandler$1.runWith(ContextHandler.java:18)
at org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2449)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1452)
at org.jboss.threads.DelegatingRunnable.run(DelegatingRunnable.java:29)
at org.jboss.threads.ThreadLocalResettingRunnable.run(ThreadLocalResettingRunnable.java:29)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: io.quarkus.builder.BuildException: Build failure: Build failed due to errors
[error]: Build step com.vaadin.quarkus.deployment.VaadinQuarkusProcessor#mapVaadinServletPaths threw an exception: java.lang.NullPointerException: Cannot invoke "org.jboss.jandex.AnnotationInstance.value(String)" because "webServletInstance" is null
at com.vaadin.quarkus.deployment.VaadinQuarkusProcessor.registerUserServlets(VaadinQuarkusProcessor.java:231)
at com.vaadin.quarkus.deployment.VaadinQuarkusProcessor.mapVaadinServletPaths(VaadinQuarkusProcessor.java:127)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at io.quarkus.deployment.ExtensionLoader$3.execute(ExtensionLoader.java:925)
at io.quarkus.builder.BuildContext.run(BuildContext.java:277)
at org.jboss.threads.ContextHandler$1.runWith(ContextHandler.java:18)
at org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2449)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1478)
at java.base/java.lang.Thread.run(Thread.java:833)
at org.jboss.threads.JBossThread.run(JBossThread.java:501)
at io.quarkus.builder.Execution.run(Execution.java:116)
at io.quarkus.builder.BuildExecutionBuilder.execute(BuildExecutionBuilder.java:79)
at io.quarkus.deployment.QuarkusAugmentor.run(QuarkusAugmentor.java:157)
at io.quarkus.runner.bootstrap.AugmentActionImpl.runAugment(AugmentActionImpl.java:328)
... 18 more
Caused by: java.lang.NullPointerException: Cannot invoke "org.jboss.jandex.AnnotationInstance.value(String)" because "webServletInstance" is null
at com.vaadin.quarkus.deployment.VaadinQuarkusProcessor.registerUserServlets(VaadinQuarkusProcessor.java:231)
at com.vaadin.quarkus.deployment.VaadinQuarkusProcessor.mapVaadinServletPaths(VaadinQuarkusProcessor.java:127)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:568)
at io.quarkus.deployment.ExtensionLoader$3.execute(ExtensionLoader.java:925)
at io.quarkus.builder.BuildContext.run(BuildContext.java:277)
at org.jboss.threads.ContextHandler$1.runWith(ContextHandler.java:18)
at org.jboss.threads.EnhancedQueueExecutor$Task.run(EnhancedQueueExecutor.java:2449)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1478)
at java.base/java.lang.Thread.run(Thread.java:833)
at org.jboss.threads.JBossThread.run(JBossThread.java:501)
For example if
vaadin-cdihappen to be present in classpathVaadinQuarkusProcessorfindsCdiVaadinServletand assumes it's an user providedVaadinServletwith build failing with confusing NPE.