fix:fix PolarisContextProperties instantiated twice causing NPE. (#1642)

Co-authored-by: Haotian Zhang <skyebefreeman@qq.com>

CHANGELOG.md

@@ -27,3 +27,4 @@
 - fix:fix tsf lossless not working bug.
 - fix:fix RestTemplate trace attribute loss bug.
 - fix:fix polaris_namespace is null when using TSF.
+- [fix:fix PolarisContextProperties instantiated twice causing NPE.](https://github.com/Tencent/spring-cloud-tencent/pull/1642)

spring-cloud-tencent-polaris-context/src/main/java/com/tencent/cloud/polaris/context/config/PolarisContextAutoConfiguration.java

@@ -46,9 +46,15 @@ import org.springframework.core.env.Environment;
  * @author Haotian Zhang
  */
 @ConditionalOnPolarisEnabled
-@EnableConfigurationProperties({PolarisContextProperties.class})
+@EnableConfigurationProperties
 public class PolarisContextAutoConfiguration {
 
+	@Bean
+	@ConditionalOnMissingBean
+	public PolarisContextProperties polarisContextProperties() {
+		return new PolarisContextProperties();
+	}
+
 	@Bean(initMethod = "init")
 	@ConditionalOnMissingBean
 	public PolarisSDKContextManager polarisSDKContextManager(PolarisContextProperties properties, Environment environment, List<PolarisConfigModifier> modifierList) throws PolarisException {

spring-cloud-tencent-polaris-context/src/main/java/com/tencent/cloud/polaris/context/config/PolarisContextProperties.java

@@ -68,7 +68,7 @@ public class PolarisContextProperties {
 	/**
 	 * current server local port.
 	 */
-	@Value("${spring.cloud.polaris.localPort:}")
+	@Value("${spring.cloud.polaris.localPort:0}")
 	private Integer localPort;
 
 	/**