enhancement #I821F1 补充注释

liteflow-core/src/main/java/com/yomahub/liteflow/builder/el/LiteFlowChainELBuilder.java

@@ -202,9 +202,8 @@ public class LiteFlowChainELBuilder {
 		try {
 			objectMapper.writeValueAsString(this.chain);
 		} catch (Exception e) {
-			e.printStackTrace();
 			if (e instanceof JsonMappingException) {
-				throw new CyclicDependencyException(StrUtil.format("There is a circular dependency in the chain[{}], please check carefully.", chain.getChainId()));
+				throw new CyclicDependencyException(StrUtil.format("There is a circular dependency in the chain[{}], please check carefully.", chain.getChainId(), e));
 			} else {
 				throw new ParseException(e.getMessage());
 			}

liteflow-core/src/main/java/com/yomahub/liteflow/flow/element/Node.java

@@ -47,6 +47,7 @@ public class Node implements Executable, Cloneable, Rollbackable{
 
 	private String language;
 
+	// 增加该注解，避免在使用 Jackson 序列化检测循环引用时出现不必要异常
 	@JsonIgnore
 	private NodeComponent instance;