🐛 fix(`boot/platform/src/main/java/com/plate/boot/commons/utils/BeanU…

…tils.java`): Add null property check and update Javadoc comments

This commit introduces enhancements to `BeanUtils` by adding functionality to retrieve a list of property names with null values from the source object. It also updates the Javadoc comments to better describe the class and its methods, improving code documentation and readability.

boot/platform/src/main/java/com/plate/boot/commons/utils/BeanUtils.java

@@ -28,16 +28,33 @@
 import java.util.stream.Collectors;
 
 /**
- * Converts a JavaBean object into a Map representation.
- * Each property of the bean is represented as a key-value pair in the map,
- * with the property name as the key and its corresponding value as the value.
+ * Retrieves a list of property names from the source object that have null values.
+ * This method is particularly useful when needing to filter out null properties during a copy operation.
  */
 @Log4j2
 @Component
 public final class BeanUtils implements InitializingBean {
 
+    /**
+     * A private constant field representing an instance of ByteArrayOutputStream.
+     * This is used for efficient byte array output operations, typically in scenarios
+     * where frequent writes to a byte stream are necessary before ultimately
+     * converting the data into a byte array. The ByteArrayOutputStream is mutable
+     * and can be reused after calling reset() method.
+     */
     private final static ByteArrayOutputStream BYTE_ARRAY_OUTPUT_STREAM;
+    /**
+     * A private constant field representing an object output stream.
+     * This stream is used for serializing objects and writing them to a byte stream.
+     * It is declared as final, indicating that once initialized, it should not be reassigned.
+     */
     private final static ObjectOutputStream OBJECT_OUTPUT_STREAM;
+
+    /**
+     * Represents the maximum size of data that can be held in memory.
+     * This threshold is utilized to determine when data should be processed differently,
+     * such as being written to disk, to avoid exceeding memory constraints.
+     */
     public static DataSize MAX_IN_MEMORY_SIZE;
 
     static {