fix:fix system env variable read bug.

Author: SkyeBeFreeman

CHANGELOG.md

@@ -28,3 +28,4 @@
 - [fix:upgrade spring version.](https://github.com/Tencent/spring-cloud-tencent/pull/1087)
 - [fix:Update README-zh.md](https://github.com/Tencent/spring-cloud-tencent/pull/1093).
 - [feature: support Polaris configuration center extension plugin interface and support dynamic modification of log levels.](https://github.com/Tencent/spring-cloud-tencent/pull/1104).
+- fix:fix system env variable read bug.

README-zh.md

@@ -78,7 +78,7 @@ Spring Cloud Tencent 所有组件都已上传到 Maven 中央仓库，只需要
             <groupId>com.tencent.cloud</groupId>
             <artifactId>spring-cloud-tencent-dependencies</artifactId>
             <!--version number-->
-            <version>1.12.2-2020.0.6</version>
+            <version>1.12.3-2020.0.6</version>
             <type>pom</type>
             <scope>import</scope>
         </dependency>

README.md

@@ -80,7 +80,7 @@ For example:
             <groupId>com.tencent.cloud</groupId>
             <artifactId>spring-cloud-tencent-dependencies</artifactId>
             <!--version number-->
-            <version>1.12.2-2020.0.6</version>
+            <version>1.12.3-2020.0.6</version>
             <type>pom</type>
             <scope>import</scope>
         </dependency>

pom.xml

@@ -88,7 +88,7 @@
 
 	<properties>
 		<!-- Project revision -->
-		<revision>1.12.2-2020.0.6</revision>
+		<revision>1.12.3-2020.0.6</revision>
 
 		<!-- Spring Framework -->
 		<spring.framework.version>5.3.25</spring.framework.version>

spring-cloud-starter-tencent-polaris-config/src/main/java/com/tencent/cloud/polaris/config/listener/PolarisConfigChangeEventListener.java

@@ -26,6 +26,8 @@
 import com.google.common.collect.Maps;
 import com.tencent.cloud.polaris.config.spring.event.ConfigChangeSpringEvent;
 import com.tencent.polaris.configuration.api.core.ConfigPropertyChangeInfo;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import org.springframework.boot.context.event.ApplicationStartedEvent;
 import org.springframework.cloud.context.environment.EnvironmentChangeEvent;
@@ -37,6 +39,7 @@
 import org.springframework.core.env.ConfigurableEnvironment;
 import org.springframework.core.env.Environment;
 import org.springframework.core.env.MutablePropertySources;
+import org.springframework.core.env.StandardEnvironment;
 import org.springframework.lang.NonNull;
 
 import static com.tencent.cloud.polaris.config.listener.PolarisConfigListenerContext.fireConfigChange;
@@ -50,6 +53,8 @@
  */
 public final class PolarisConfigChangeEventListener implements ApplicationListener<ApplicationEvent>, ApplicationEventPublisherAware {
 
+	private static final Logger LOG = LoggerFactory.getLogger(PolarisConfigChangeEventListener.class);
+
 	private static final AtomicBoolean started = new AtomicBoolean();
 
 	private ApplicationEventPublisher eventPublisher;
@@ -96,12 +101,23 @@ private Map<String, Object> loadEnvironmentProperties(ConfigurableEnvironment en
 		Map<String, Object> ret = Maps.newHashMap();
 		MutablePropertySources sources = environment.getPropertySources();
 		sources.iterator().forEachRemaining(propertySource -> {
+			// Don't read system env variable.
+			if (StandardEnvironment.SYSTEM_ENVIRONMENT_PROPERTY_SOURCE_NAME.equals(propertySource.getName())) {
+				return;
+			}
+
 			Object o = propertySource.getSource();
 			if (o instanceof Map) {
 				for (Map.Entry<String, Object> entry : ((Map<String, Object>) o).entrySet()) {
 					String key = entry.getKey();
-					String value = environment.getProperty(key);
-					ret.put(key, value);
+					try {
+						String value = environment.getProperty(key);
+						ret.put(key, value);
+					}
+					catch (Exception e) {
+						LOG.warn("Read property from {} with key {} failed.", propertySource.getName(), key, e);
+					}
+
 				}
 			}
 			else if (o instanceof Collection) {

spring-cloud-tencent-dependencies/pom.xml

@@ -70,7 +70,7 @@
 	</developers>
 
 	<properties>
-		<revision>1.12.2-2020.0.6</revision>
+		<revision>1.12.3-2020.0.6</revision>
 
 		<!-- Dependencies -->
 		<polaris.version>1.14.1</polaris.version>