Update JavadocPropertyCustomizer.java

A NPE exception occurs when a property does not have a getter method

Author: cnhnwt

springdoc-openapi-starter-common/src/main/java/org/springdoc/core/customizers/JavadocPropertyCustomizer.java

@@ -166,9 +166,11 @@ public void setJavadocDescription(Class<?> cls, List<Field> fields, List<Propert
 							if (StringUtils.isBlank(stringSchemaEntry.getValue().getDescription())) {
 								Optional<PropertyDescriptor> optionalPd = clsProperties.stream().filter(pd -> pd.getName().equals(stringSchemaEntry.getKey())).findAny();
 								optionalPd.ifPresent(pd1 -> {
-									String fieldJavadoc = javadocProvider.getMethodJavadocDescription(pd1.getReadMethod());
-									if (StringUtils.isNotBlank(fieldJavadoc))
-										stringSchemaEntry.getValue().setDescription(fieldJavadoc);
+									if(pd1.getReadMethod() != null) {
+										String fieldJavadoc = javadocProvider.getMethodJavadocDescription(pd1.getReadMethod());
+										if (StringUtils.isNotBlank(fieldJavadoc))
+											stringSchemaEntry.getValue().setDescription(fieldJavadoc);
+									}
 								});
 							}
 						});