cqutwangyu commented on issue #15605:
URL:
https://github.com/apache/dolphinscheduler/issues/15605#issuecomment-1958847755
以下是我的测试代码 Demo.java
Here's my test code demo.java
```java
import java.io.File;
import java.io.IOException;
import java.lang.reflect.Field;
public class Demo {
public static void main(String[] args) throws IOException {
ProcessBuilder processBuilder = new ProcessBuilder();
processBuilder.directory(new File("/opt/test"));
processBuilder.redirectErrorStream(true);
processBuilder.command(args);
Process p = processBuilder.start();
int processId = getProcessId(p);
System.out.println("pid:"+processId);
System.out.println("isAlive:"+p.isAlive());
}
private static int getProcessId(Process process) {
int processId = 0;
try {
Field f = process.getClass().getDeclaredField("pid");
f.setAccessible(true);
processId = f.getInt(process);
} catch (Exception e) {
System.out.println("Get task pid failed"+e.getMessage());
}
return processId;
}
}
```
先编译java文件，并创建一个sh脚本文件
Compile the Java file first and create an sh script file
```
javac Demo.java
echo "java -jar server-0.0.1-SNAPSHOT.jar" > server-start.sh
```
执行sh脚本启动java程序，则获取到的pid是错误的。
Executing the sh script starts the Java program, and the pid is wrong.
```
java Demo sh server-start.sh
pid:35054
isAlive:true
jps
35080 Jps
35055 jar
```
直接执行java命令启动java程序，则能获取到正确的pid。
The direct execution of the Java command starts the Java program and gets
the correct pid.
```
kill -9 35055
java Demo java -jar server-0.0.1-SNAPSHOT.jar
pid:35641
isAlive:true
jps
35669 Jps
35641 jar
```
以下是运行环境
The following is the operating environment
```
java -version
java version "1.8.0_261"
Java(TM) SE Runtime Environment (build 1.8.0_261-b12)
Java HotSpot(TM) 64-Bit Server VM (build 25.261-b12, mixed mode)
uname -a
Linux urc-esb-server2 3.10.0-514.el7.x86_64 #1 SMP Wed Oct 19 11:24:13 EDT
2016 x86_64 x86_64 x86_64 GNU/Linux
```
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