Remove the expression which is always true.

zlt-job/job-core/src/main/java/com/xxl/job/core/log/XxlJobFileAppender.java

@@ -200,14 +200,12 @@ public class XxlJobFileAppender {
 		BufferedReader reader = null;
 		try {
 			reader = new BufferedReader(new InputStreamReader(new FileInputStream(logFile), "utf-8"));
-			if (reader != null) {
-				StringBuilder sb = new StringBuilder();
-				String line = null;
-				while ((line = reader.readLine()) != null) {
-					sb.append(line).append("\n");
-				}
-				return sb.toString();
+			StringBuilder sb = new StringBuilder();
+			String line = null;
+			while ((line = reader.readLine()) != null) {
+				sb.append(line).append("\n");
 			}
+			return sb.toString();
 		} catch (IOException e) {
 			logger.error(e.getMessage(), e);
 		} finally {

zlt-job/job-core/src/main/java/com/xxl/job/core/thread/TriggerCallbackThread.java

@@ -215,7 +215,7 @@ public class TriggerCallbackThread {
         }
 
         // retry callback, 100 lines per page
-        if (failCallbackParamList!=null && failCallbackParamList.size()>0) {
+        if (failCallbackParamList.size()>0) {
             int pagesize = 100;
             List<HandleCallbackParam> pageData = new ArrayList<>();
             for (int i = 0; i < failCallbackParamList.size(); i++) {