additionalProperties:false generates invalid Java code with Map<String,>

[akstatic]

I have used AI to do the analysis of the bug to help me out. Below was its finding.

Description

When an AsyncAPI schema includes additionalPropertioes: false, the code generator produced invalid java code with malformed Map declaration: private Map<String, > additionalProperties;

This causes compilation failure.

Steps to Reproduce

1. Create an AsyncAPI schema with

Document:
  title: Document
  type: object
  additionalProperties: false

2. Run the code generator in maven plugin
3. The generated Document.java contains

private Map<String, > additionalProperties; //Invalid - missing value type

4. Compilation fails

Expected Behaviour

When additionalPropertioes: false is specified, no field should be generated because this directive means "do not allow any additional properties beyond those explicitly defined."

According to AsyncAPI specification

• additionalPropertioes: false = No additional properties allowed (strict schema)
• additionalPropertioes: true = Allow any additional properties (generates Map<String, Object>)
• additionalPropertioes:{schema} = Allow additional properties matching the schema

Actual behaviour

The generator attempts to create a field but produced invalid code with an incomplete generic type

Root cause

The bug is in the ModelBuilder.java line 542 in the processAdditionalProperties() method:
File: https://github.com/sngular/scs-multiapi-plugin/blob/main/multiapi-engine/src/main/java/com/sngular/api/generator/plugin/common/tools/ModelBuilder.java#L542

if (TypeConstants.isBoolean(addPropObj.asText())) {
      fieldObjectArrayList
          .add(SchemaFieldObject
                   .builder()
                   .baseName(fieldName)
                   .dataType(SchemaFieldObjectType.fromTypeList(TypeConstants.MAP, TypeConstants.OBJECT))
                   .build());
    }

The TypeConstants.isBoolean() method is incorrectly implemented:
File: https://github.com/sngular/scs-multiapi-plugin/blob/main/multiapi-engine/src/main/java/com/sngular/api/generator/plugin/common/model/TypeConstants.java#L101

public static boolean isBoolean(final String isBoolean) {
    return Boolean.parseBoolean(isBoolean.toLowerCase());
  }

The Problem Explained

The TypeConstants.isBoolean() method parses the string as a boolean and returns the parsed value, not whether it's a boolean literal

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