Fix for slow startup time on GraalVM 20 (#288)

resources/CutOffCoreServicesDependencies.java

@@ -0,0 +1,19 @@
+import org.graalvm.nativeimage.Platform;
+import org.graalvm.nativeimage.Platforms;
+import com.oracle.svm.core.annotate.TargetClass;
+import com.oracle.svm.core.annotate.Delete;
+
+public final class CutOffCoreServicesDependencies {
+}
+
+// @Platforms(Platform.DARWIN.class)
+// @TargetClass(className = "sun.net.spi.DefaultProxySelector")
+// @Delete
+// final class Target_sun_net_spi_DefaultProxySelector {
+// }
+
+@Platforms(Platform.DARWIN.class)
+@TargetClass(className = "apple.security.KeychainStore")
+@Delete
+final class Target_apple_security_KeychainStore {
+}

script/compile

@@ -17,6 +17,8 @@ BABASHKA_VERSION=$(cat resources/BABASHKA_VERSION)
 
 export JAVA_HOME=$GRAALVM_HOME
 
+$GRAALVM_HOME/bin/javac -cp $GRAALVM_HOME/jre/lib/svm/builder/svm.jar resources/CutOffCoreServicesDependencies.java
+
 lein with-profiles +reflection do run
 lein do clean, uberjar
 
@@ -37,6 +39,7 @@ args=( -jar target/babashka-$BABASHKA_VERSION-standalone.jar \
             --verbose \
             --no-fallback \
             --no-server \
+            --report-unsupported-elements-at-runtime \
             "$BABASHKA_XMX" )
 
 if [ "$BABASHKA_STATIC" = "true" ]; then