Fix code review issues: unsafe casts, NPE risks, magic numbers, and typos

microsphere-spring-boot-actuator/src/test/java/io/microsphere/spring/boot/actuate/autoconfigure/ActuatorEndpointsAutoConfigurationTest.java

@@ -100,7 +100,7 @@ void testGetConfigurationProperties() {
             }
     )
     @EnableAutoConfiguration
-    class Disalbed {
+    class Disabled {
 
         @Autowired(required = false)
         private ArtifactsEndpoint artifactsEndpoint;

microsphere-spring-boot-compatible/src/main/java/org/springframework/boot/autoconfigure/web/ServerProperties.java

@@ -856,7 +856,7 @@ public static class Threads {
              * Maximum capacity of the thread pool's backing queue. This setting only has
              * an effect if the value is greater than 0.
              */
-            private int maxQueueCapacity = 2147483647;
+            private int maxQueueCapacity = Integer.MAX_VALUE;
 
             public int getMax() {
                 return this.max;

microsphere-spring-boot-compatible/src/main/java/org/springframework/boot/web/servlet/MultipartConfigFactory.java

@@ -77,7 +77,7 @@ public MultipartConfigElement createMultipartConfig() {
 		long maxRequestSizeBytes = convertToBytes(this.maxRequestSize, -1);
 		long fileSizeThresholdBytes = convertToBytes(this.fileSizeThreshold, 0);
 		return new MultipartConfigElement(this.location, maxFileSizeBytes, maxRequestSizeBytes,
-				(int) fileSizeThresholdBytes);
+				Math.toIntExact(fileSizeThresholdBytes));
 	}
 
 	/**

microsphere-spring-boot-core/src/main/java/io/microsphere/spring/boot/autoconfigure/ConfigurableAutoConfigurationImportFilter.java

@@ -219,7 +219,10 @@
 
         static ExcludedAutoConfigurationClassPropertySource get(Environment environment) {
             MutablePropertySources propertySources = getPropertySources(environment);
-            ExcludedAutoConfigurationClassPropertySource propertySource = (ExcludedAutoConfigurationClassPropertySource) propertySources.get(NAME);
+            PropertySource<?> source = propertySources.get(NAME);
+            ExcludedAutoConfigurationClassPropertySource propertySource =
+                    source instanceof ExcludedAutoConfigurationClassPropertySource
+                            ? (ExcludedAutoConfigurationClassPropertySource) source : null;
             if (propertySource == null) {
                 propertySource = new ExcludedAutoConfigurationClassPropertySource();
                 propertySources.addFirst(propertySource);

microsphere-spring-boot-core/src/main/java/io/microsphere/spring/boot/context/properties/bind/ConfigurationPropertiesBeanContext.java

@@ -250,9 +250,12 @@ private void initBinding(Class<?> beanClass, String prefix, Map<String, String>
      * @return the converted value, or the original value if conversion is not supported
      */
     Object convertForProperty(String propertyName, Object value) {
+        if (value == null) {
+            return null;
+        }
         Class<?> propertyType = this.initializedBeanWrapper.getPropertyType(propertyName);
         ConversionService conversionService = this.initializedBeanWrapper.getConversionService();
-        if (conversionService.canConvert(value.getClass(), propertyType)) {
+        if (conversionService != null && conversionService.canConvert(value.getClass(), propertyType)) {
             return conversionService.convert(value, propertyType);
         }
         return value;

microsphere-spring-boot-core/src/main/java/io/microsphere/spring/boot/context/properties/bind/EventPublishingConfigurationPropertiesBeanPropertyChangedListener.java

@@ -131,7 +131,7 @@ void initConfigurationPropertiesBeanContext(ConfigurationPropertyName name, Bind
         if (isConfigurationPropertiesBean(context)) {
             ConfigurationPropertiesBeanContext configurationPropertiesBeanContext = getConfigurationPropertiesBeanContext(name, target, context);
             Supplier<?> value = target.getValue();
-            Object bean = value.get();
+            Object bean = value != null ? value.get() : null;
             if (bean != null) {
                 if (logger.isTraceEnabled()) {
                     logger.trace("The ConfigurationPropertiesBean binding is finished , configuration property name : '{}' , type : '{}' , depth : {} , bean : '{}'", name, target.getType(), context.getDepth(), bean);

microsphere-spring-boot-core/src/test/java/io/microsphere/spring/boot/context/config/AutoRegistrationBeanInitializerTest.java

@@ -58,7 +58,7 @@ void test() {
     @TestPropertySource(
             properties = "microsphere.spring.beans.auto-registered=false"
     )
-    @DisplayName("Disalbed AutoRegistrationBeanInitializer Test")
+    @DisplayName("Disabled AutoRegistrationBeanInitializer Test")
     class DisabledTest {
 
         @Autowired