zakkak commented on issue #4148:
URL: https://github.com/apache/camel-quarkus/issues/4148#issuecomment-1270044470
> @zakkak coul you elaborate on "not getting registered properly" ? What's
happening?
After looking a bit more into it, the issue is the following.
When the class name starts with `java.` gizmo gets the class directly (not
through reflection):
```java
private static void
registerClass35(org.graalvm.nativeimage.hosted.Feature.BeforeAnalysisAccess
var0) {
try {
Collections.EmptyList.class.getDeclaredConstructors();
Collections.EmptyList.class.getDeclaredMethods();
Collections.EmptyList.class.getDeclaredFields();
Class[] var1 = new Class[]{Collections.EmptyList.class};
RuntimeReflection.register(var1);
registerSerializationForClass(Collections.EmptyList.class);
} catch (Throwable var2) {
}
}
```
However, `Collections.EmptyList` is `private`, as a result this is not going
to work. Note here that we don't see any error due to
https://github.com/quarkusio/quarkus/issues/26162. The actual exception is:
```
java.lang.IllegalAccessError: failed to access class
java.util.Collections$EmptyList from class io.quarkus.runner.Feature
(java.util.Collections$EmptyList is in module java.base of loader 'bootstrap';
io.quarkus.runner.Feature is in unnamed module of loader
com.oracle.svm.hosted.NativeImageClassLoaderSupport$ClassPathClassLoader
@6d4b1c02)
at io.quarkus.runner.Feature.registerClass35(Unknown Source)
at io.quarkus.runner.Feature.beforeAnalysis(Unknown Source)
at
org.graalvm.nativeimage.builder/com.oracle.svm.hosted.NativeImageGenerator.lambda$runPointsToAnalysis$9(NativeImageGenerator.java:722)
at
org.graalvm.nativeimage.builder/com.oracle.svm.hosted.FeatureHandler.forEachFeature(FeatureHandler.java:78)
at
org.graalvm.nativeimage.builder/com.oracle.svm.hosted.NativeImageGenerator.runPointsToAnalysis(NativeImageGenerator.java:722)
at
org.graalvm.nativeimage.builder/com.oracle.svm.hosted.NativeImageGenerator.doRun(NativeImageGenerator.java:564)
at
org.graalvm.nativeimage.builder/com.oracle.svm.hosted.NativeImageGenerator.run(NativeImageGenerator.java:521)
at
org.graalvm.nativeimage.builder/com.oracle.svm.hosted.NativeImageGeneratorRunner.buildImage(NativeImageGeneratorRunner.java:407)
at
org.graalvm.nativeimage.builder/com.oracle.svm.hosted.NativeImageGeneratorRunner.build(NativeImageGeneratorRunner.java:585)
at
org.graalvm.nativeimage.builder/com.oracle.svm.hosted.NativeImageGeneratorRunner.main(NativeImageGeneratorRunner.java:128)
```
In contrast when registering a class that is not under `java.` the register
method uses `Class.forName` which works for private methods as well and looks
like this:
```java
private static void
registerClass0(org.graalvm.nativeimage.hosted.Feature.BeforeAnalysisAccess
var0) {
try {
ClassLoader var1 =
Thread.currentThread().getContextClassLoader();
Class var2 =
Class.forName("org.apache.commons.pool2.impl.DefaultEvictionPolicy",
(boolean)0, var1);
Constructor[] var4 = var2.getDeclaredConstructors();
var2.getDeclaredMethods();
var2.getDeclaredFields();
Class[] var3 = new Class[]{var2};
RuntimeReflection.register(var3);
RuntimeReflection.register((Executable[])var4);
} catch (Throwable var5) {
}
}
```
So I think that we either need to drop the `java.` prefix optimization from
gizmo or start checking if the class is private or not as well.
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