CreateDynamicProxy errors when proxying javax.servlet.*

I’m using createDynamicProxy to wrap javax.servlet.Filter & javax.servlet.FilterChain in order to run a custom request filtering pipeline.

var javaFilterChain = createDynamicProxy(this, ["javax.servlet.FilterChain"]);

This works in 5.3, but in 5.4, it fails with

NoSuchMethodException V74060b24f0ec0385d9f86f0aa69578ed4150.<init>(lucee.runtime.config.ConfigWeb, lucee.runtime.Component)

However, looking at the decompiled class file for V74060b24f0ec0385d9f86f0aa69578ed4150:

// Source code is decompiled from a .class file using FernFlower decompiler.
import javax.servlet.FilterChain;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import lucee.loader.engine.CFMLEngineFactory;
import lucee.runtime.Component;
import lucee.runtime.config.ConfigWeb;
import lucee.runtime.util.JavaProxyUtil;

public class V74060b24f0ec0385d9f86f0aa69578ed4150 implements FilterChain {
   private Component cfc;
   private ConfigWeb config;

   public V74060b24f0ec0385d9f86f0aa69578ed4150(ConfigWeb config, Component cfc) {
      this.config = config;
      this.cfc = cfc;
   }

   public final void doFilter(ServletRequest var1, ServletResponse var2) {
      ((JavaProxyUtil)CFMLEngineFactory.getInstance().getJavaProxyUtil()).call(this.config, this.cfc, "doFilter", new Object[]{((JavaProxyUtil)CFMLEngineFactory.getInstance().getJavaProxyUtil()).toCFML(var1), ((JavaProxyUtil)CFMLEngineFactory.getInstance().getJavaProxyUtil()).toCFML(var2)});
   }
}

Clearly in the bytecode the constructor exists - is this some classloader weirdness going on?

Don’t forget to tell us about your stack!

OS: Linux
Java Version: 11
Tomcat Version: 8 or 9
Lucee Version: 5.4.4

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