src/java.base/share/classes/java/lang/reflect/Proxy.java

*** 706,716 ****
          ProxyBuilder(ClassLoader loader, List<Class<?>> interfaces) {
              if (!VM.isModuleSystemInited()) {
                  throw new InternalError("Proxy is not supported until module system is fully initialzed");
              }
              if (interfaces.size() > 65535) {
!                 throw new IllegalArgumentException("interface limit exceeded");
              }
  
              Set<Class<?>> refTypes = referencedTypes(loader, interfaces);
  
              // IAE if violates any restrictions specified in newProxyInstance
--- 706,716 ----
          ProxyBuilder(ClassLoader loader, List<Class<?>> interfaces) {
              if (!VM.isModuleSystemInited()) {
                  throw new InternalError("Proxy is not supported until module system is fully initialzed");
              }
              if (interfaces.size() > 65535) {
!                 throw new IllegalArgumentException("interface limit exceeded: " + interfaces.size());
              }
  
              Set<Class<?>> refTypes = referencedTypes(loader, interfaces);
  
              // IAE if violates any restrictions specified in newProxyInstance