JDK 11 causes NoClassDefFoundError AEM 6.5

Install the CXF packages externally to solve the issue of the  NoClassDefFoundError after an upgrade to Java 11 with AEM 6.5x.

Description description

The error below is observed in the logs after upgrading to Java 11 with AEM 6.5.x.

15.09.2020 00:30:20.868 *ERROR* [ FelixStartLevel] org.apache.sling.scripting.sightly bundle
org.apache.sling.scripting.sightly:1.1.2.1_4_0 (557)
[ org.apache.sling.scripting.sightly.impl.engine.extension.use.JavaUseProvider(3410)] : Error during
instantiation of the implementation object (java.lang.NoClassDefFoundError:
jdk/internal/reflect/ConstructorAccessorImpl)
java.lang.NoClassDefFoundError: jdk/internal/reflect/ConstructorAccessorImpl
      at java.base/jdk.internal.misc.Unsafe.defineClass0(Native Method)
      at java.base/jdk.internal.misc.Unsafe.defineClass(Unsafe.java:1192)
      at java.base/jdk.internal.reflect.ClassDefiner.defineClass(ClassDefiner.java:63)
      at java.base/jdk.internal.reflect.MethodAccessorGenerator$1.run(MethodAccessorGenerator.java:400)
      at java.base/jdk.internal.reflect.MethodAccessorGenerator$1.run(MethodAccessorGenerator.java:394)
      at java.base/java.security.AccessController.doPrivileged(Native Method)
…
Caused by: java.lang.ClassNotFoundException: Unable to load class
‘jdk.internal.reflect.ConstructorAccessorImpl’
     at org.apache.felix.framework.BundleWiringImpl$1.loadClass(BundleWiringImpl.java:91)
     at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
     at
org.apache.felix.framework.BundleWiringImpl.findClassOrResourceByDelegation(BundleWiringImpl.java:1463)
      at org.apache.felix.framework.BundleWiringImpl.access$300(BundleWiringImpl.java:79)
      at
org.apache.felix.framework.BundleWiringImpl$BundleClassLoader.loadClass(BundleWiringImpl.java:1982)
      at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
… 111 common frames omitted

Resolution resolution

This issue is due to CXF packages having been removed from AEM and those need to be installed externally:

Note: See NoClassDefFoundError: jdk/internal/reflect/ConstructorAccessorImpl with Oracle JDK 11.0.3 on issues.apache.org for technical details on this issue.