Thanks, luckily I am on a mac and managed to build it successfully with your steps.
However the message is still not gone.
[INFO] --- aspectj-maven-plugin:1.6:compile (default) @ decor-web-utils ---
[ERROR] The type ModelRequestParameters must implement the inherited abstract method Map<String,Object>.replaceAll(BiFunction<? super String,? super Object,? extends Object>)
[ERROR] The type ModelRequestParameters must implement the inherited abstract method Map<String,Object>.putIfAbsent(String, Object)
[ERROR] The type ModelRequestParameters must implement the inherited abstract method Map<String,Object>.getOrDefault(Object, Object)
[ERROR] The type ModelRequestParameters must implement the inherited abstract method Iterable<EmailFormHelper.ModelParamNameValue>.forEach(Consumer<? super EmailFormHelper.ModelParamNameValue>)
[ERROR] The type ModelRequestParameters must implement the inherited abstract method Map<String,Object>.forEach(BiConsumer<? super String,? super Object>)
[ERROR] The type ModelRequestParameters must implement the inherited abstract method Iterable<EmailFormHelper.ModelParamNameValue>.spliterator()
[ERROR] The type ModelRequestParameters must implement the inherited abstract method Map<String,Object>.compute(String, BiFunction<? super String,? super Object,? extends Object>)
[ERROR] The type ModelRequestParameters must implement the inherited abstract method Map<String,Object>.computeIfAbsent(String, Function<? super String,? extends Object>)
[ERROR] The type ModelRequestParameters must implement the inherited abstract method Map<String,Object>.merge(String, Object, BiFunction<? super Object,? super Object,? extends Object>)
[ERROR] The type ModelRequestParameters must implement the inherited abstract method Map<String,Object>.replace(String, Object, Object)
[ERROR] The type ModelRequestParameters must implement the inherited abstract method Map<String,Object>.replace(String, Object)
[ERROR] The type ModelRequestParameters must implement the inherited abstract method Map<String,Object>.computeIfPresent(String, BiFunction<? super String,? super Object,? extends Object>)
[ERROR] The type ModelRequestParameters must implement the inherited abstract method Map<String,Object>.remove(Object, Object)
[ERROR] The type new Iterator<EmailFormHelper.ModelParamNameValue>(){} must implement the inherited abstract method Iterator<EmailFormHelper.ModelParamNameValue>.forEachRemaining(Consumer<? super EmailFormHelper.ModelParamNameValue>)
[ERROR] The type new Comparator<FileEntry>(){} must implement the inherited abstract method Comparator<FileEntry>.thenComparing(Function<? super FileEntry,? extends U>, Comparator<? super U>)
[ERROR] The type new Comparator<FileEntry>(){} must implement the inherited abstract method Comparator<FileEntry>.thenComparing(Function<? super FileEntry,? extends U>)
[ERROR] The type new Comparator<FileEntry>(){} must implement the inherited abstract method Comparator<FileEntry>.thenComparing(Comparator<? super FileEntry>)
[ERROR] The type new Comparator<FileEntry>(){} must implement the inherited abstract method Comparator<FileEntry>.thenComparingDouble(ToDoubleFunction<? super FileEntry>)
[ERROR] The type new Comparator<FileEntry>(){} must implement the inherited abstract method Comparator<FileEntry>.thenComparingLong(ToLongFunction<? super FileEntry>)
[ERROR] The type new Comparator<FileEntry>(){} must implement the inherited abstract method Comparator<FileEntry>.thenComparingInt(ToIntFunction<? super FileEntry>)
[ERROR] The type new Comparator<FileEntry>(){} must implement the inherited abstract method Comparator<FileEntry>.reversed()
[ERROR] The type JdoUserService.UserComparator must implement the inherited abstract method Comparator<User>.thenComparing(Function<? super User,? extends U>, Comparator<? super U>)
[ERROR] The type JdoUserService.UserComparator must implement the inherited abstract method Comparator<User>.thenComparing(Function<? super User,? extends U>)
[ERROR] The type JdoUserService.UserComparator must implement the inherited abstract method Comparator<User>.thenComparing(Comparator<? super User>)
[ERROR] The type JdoUserService.UserComparator must implement the inherited abstract method Comparator<User>.thenComparingDouble(ToDoubleFunction<? super User>)
[ERROR] The type JdoUserService.UserComparator must implement the inherited abstract method Comparator<User>.thenComparingLong(ToLongFunction<? super User>)
[ERROR] The type JdoUserService.UserComparator must implement the inherited abstract method Comparator<User>.thenComparingInt(ToIntFunction<? super User>)
[ERROR] The type JdoUserService.UserComparator must implement the inherited abstract method Comparator<User>.reversed()
[ERROR] The type new Comparator<StructureEntry>(){} must implement the inherited abstract method Comparator<StructureEntry>.thenComparing(Function<? super StructureEntry,? extends U>, Comparator<? super U>)
[ERROR] The type new Comparator<StructureEntry>(){} must implement the inherited abstract method Comparator<StructureEntry>.thenComparing(Function<? super StructureEntry,? extends U>)
[ERROR] The type new Comparator<StructureEntry>(){} must implement the inherited abstract method Comparator<StructureEntry>.thenComparing(Comparator<? super StructureEntry>)
[ERROR] The type new Comparator<StructureEntry>(){} must implement the inherited abstract method Comparator<StructureEntry>.thenComparingDouble(ToDoubleFunction<? super StructureEntry>)
[ERROR] The type new Comparator<StructureEntry>(){} must implement the inherited abstract method Comparator<StructureEntry>.thenComparingLong(ToLongFunction<? super StructureEntry>)
[ERROR] The type new Comparator<StructureEntry>(){} must implement the inherited abstract method Comparator<StructureEntry>.thenComparingInt(ToIntFunction<? super StructureEntry>)
[ERROR] The type new Comparator<StructureEntry>(){} must implement the inherited abstract method Comparator<StructureEntry>.reversed()
[ERROR] The type HandlebarsHelpers.CustomField must implement the inherited abstract method CharSequence.codePoints()
[ERROR] The type HandlebarsHelpers.CustomField must implement the inherited abstract method CharSequence.chars()
[ERROR] The type new Comparator<Component>(){} must implement the inherited abstract method Comparator<Component>.thenComparing(Function<? super Component,? extends U>, Comparator<? super U>)
[ERROR] The type new Comparator<Component>(){} must implement the inherited abstract method Comparator<Component>.thenComparing(Function<? super Component,? extends U>)
[ERROR] The type new Comparator<Component>(){} must implement the inherited abstract method Comparator<Component>.thenComparing(Comparator<? super Component>)
[ERROR] The type new Comparator<Component>(){} must implement the inherited abstract method Comparator<Component>.thenComparingDouble(ToDoubleFunction<? super Component>)
[ERROR] The type new Comparator<Component>(){} must implement the inherited abstract method Comparator<Component>.thenComparingLong(ToLongFunction<? super Component>)
[ERROR] The type new Comparator<Component>(){} must implement the inherited abstract method Comparator<Component>.thenComparingInt(ToIntFunction<? super Component>)
[ERROR] The type new Comparator<Component>(){} must implement the inherited abstract method Comparator<Component>.reversed()
[ERROR] The type new Comparator<JSONObject>(){} must implement the inherited abstract method Comparator<JSONObject>.thenComparing(Function<? super JSONObject,? extends U>, Comparator<? super U>)
[ERROR] The type new Comparator<JSONObject>(){} must implement the inherited abstract method Comparator<JSONObject>.thenComparing(Function<? super JSONObject,? extends U>)
[ERROR] The type new Comparator<JSONObject>(){} must implement the inherited abstract method Comparator<JSONObject>.thenComparing(Comparator<? super JSONObject>)
[ERROR] The type new Comparator<JSONObject>(){} must implement the inherited abstract method Comparator<JSONObject>.thenComparingDouble(ToDoubleFunction<? super JSONObject>)
[ERROR] The type new Comparator<JSONObject>(){} must implement the inherited abstract method Comparator<JSONObject>.thenComparingLong(ToLongFunction<? super JSONObject>)
[ERROR] The type new Comparator<JSONObject>(){} must implement the inherited abstract method Comparator<JSONObject>.thenComparingInt(ToIntFunction<? super JSONObject>)
[ERROR] The type new Comparator<JSONObject>(){} must implement the inherited abstract method Comparator<JSONObject>.reversed()
And it goes on.