@java.lang.Override
    public com.google.cloud.vertexai.api.Schema getPropertiesOrThrow(java.lang.String key) {
      if (key == null) {
        throw new NullPointerException("map key");
      }
      java.util.Map<java.lang.String, com.google.cloud.vertexai.api.SchemaOrBuilder> map =
          internalGetMutableProperties().ensureBuilderMap();
      if (!map.containsKey(key)) {
        throw new java.lang.IllegalArgumentException();
      }
      return propertiesConverter.build(map.get(key));
    }
<pre>
Optional. SCHEMA FIELDS FOR TYPE OBJECT
Properties of Type.OBJECT.
</pre>

<code>
map&lt;string, .google.cloud.vertexai.v1.Schema&gt; properties = 3 [(.google.api.field_behavior) = OPTIONAL];
</code>
java-vertexai/proto-google-cloud-vertexai-v1/src/main/java/com/google/cloud/vertexai/api/Schema.java