add(req-2080):加日志，查看linux服务器中的类文件路径

oss-service/src/main/java/cn/axzo/oss/service/impl/FileServiceImpl.java

@@ -644,7 +644,7 @@ public class FileServiceImpl implements FileService {
             String fileName = file.getOriginalFilename();
 
             ClassLoader contextClassLoader = Thread.currentThread().getContextClassLoader();
-            String classPath = contextClassLoader.getResource("").getPath();
+            String classPath = Objects.requireNonNull(contextClassLoader.getResource("")).getPath();
             log.info("linux服务器下的类文件路径：{}", classPath);
             String projectPath = classPath.substring(0, classPath.indexOf("/target/classes/"));
             log.info("linux服务器下的项目路径:{}", projectPath);