refactor(ProcessUtil): 简化进程PID获取逻辑，适配docker JDK11环境

ruoshui-core/src/main/java/com/ruoshui/core/util/ProcessUtil.java

@@ -70,27 +70,12 @@ public class ProcessUtil {
                     // Java 9+ 推荐方式：ProcessHandle API
                     pid = ((ProcessHandle) process).pid();
                 } else {
-                    // JDK 9+ 降级方案：使用实际进程类反射获取 pid
+                    // 目前服务器上的docker JDK 11 方案：使用实际进程类反射获取 pid
                     Class<?> clazz = process.getClass();
                     Field declaredField = clazz.getDeclaredField("pid");
                     declaredField.setAccessible(true);
                     pid = declaredField.getLong(process);
                 }
-
-            } catch (NoSuchMethodError e) {
-                // 降级走 JDK 8 反射逻辑
-                try {
-                    Class<?> clazz = Class.forName("java.lang.UNIXProcess");
-                    Field declaredField = clazz.getDeclaredField("pid");
-                    declaredField.setAccessible(true);
-                    pid = declaredField.getInt(process);
-                } catch (Exception ex) {
-                    // 最终容错，返回-1不中断任务
-                    pid = -1;
-                    logger.error("get process id for unix error {0}", e);
-                    // throw new UnsupportedOperationException("不支持当前JDK的进程ID获取");
-
-                }
             }  catch (Throwable e) {
                 logger.error("get process id for unix error ", e);
                 throw new UnsupportedOperationException("不支持当前JDK的进程ID获取");