Windows: Does not spawn process to start server on windows

[Vishal-Joshi]

I am using SpawnProcessTask to start embedded server in my application. Following is the gradle task:-

task startServer(group: "Exec", description: 'Starts the service in the background', type: SpawnProcessTask, dependsOn: 'createCapsule') {
command "java -jar ${projectDir}/build/libs/capsule.jar server ${projectDir}/config/local.yml"
ready 'org.eclipse.jetty.server.Server: Started'
directory "."
}

The above task performs perfectly fine on linux but fails on windows. Following is the exception I am getting:-

---

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':startServer'.

  java.lang.NoSuchFieldException: pid

• Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

---

[storytime]

The same issue, @Vishal-Joshi have you fix this issue?

[Vishal-Joshi]

Hi @storytime, I could not find a fix for it :(. The only way I temporarily made it working is to run the jar through terminal which of course, consumes the terminal.

[wenslayer]

I see I'm not the only one experiencing this issue. I've got it working successfully on Linux and Mac for controlling the PhantomJS webdriver, but I get the same error above when trying to run it on Windows.

The problem is in this part of code:

def pidField = process.class.getDeclaredField('pid')

In Windows would be necessary change to:

def pidField = process.class.getDeclaredField('handle')

https://github.com/marc0der/gradle-spawn-plugin/blob/master/src/main/groovy/com/wiredforcode/gradle/spawn/SpawnProcessTask.groovy#L94

[sachinkshetty]

@paulocardoso can you please tell me in which file should i change the pidField declaration in windows

[aaronbond]

I also would like this to be fixed.

[coderdude1]

I noticed @echovue appears to have implemented a fix for this, I'm hoping he will submit a pull request for his fix

[eskatos]

👍 to fix this, faced the issue too

[echovue]

I'm still working on the fix... Seems like I get close, and then run into something else. Right now, I'm buried in the bowels of trying to use JNA to retrieve the Windows PID. Hopefully I'll have that figured out soon though.

[tmeltser]

Hi,
I also just came across the same exact problem with the same stack trace (using the 0.8.2 release), and this prevents using it all together (and it is a very useful plugin).

Any update on the issue?

[abarsov]

I have implemented starting/killing process on Windows.
This would work with Java 9 and higher (since public method Process.pid() was added there).

Could someone with write access review and merge the pull request, please?

I could also update gradle version in a project to at list 4.8.1 if nobody would argue against that.