fstat is failed on Java 17

[yshupletsov]

Moving to Java 17 I could not get fstat of the file descriptor:

java.lang.RuntimeException: native error calling fstat: Bad file descriptor -1
	at jnr.posix.util.DefaultPOSIXHandler.error(DefaultPOSIXHandler.java:24)
	at jnr.posix.LinuxPOSIX.fstat(LinuxPOSIX.java:117)
	at jnr.posix.CheckedPOSIX.fstat(CheckedPOSIX.java:135)
	at jnr.posix.LazyPOSIX.fstat(LazyPOSIX.java:132)
	at com.openwaygroup.appserver.monitoring.logprocessor.files.posix.PosixFileInformation.getFileInformation(PosixFileInformation.kt:15)
	at com.openwaygroup.appserver.monitoring.logprocessor.processor.EventProcessorImpl.processEvent(EventProcessorImpl.kt:36)
	at com.openwaygroup.appserver.monitoring.logprocessor.processor.EventProcessorImpl.processEvent(EventProcessorImpl.kt:19)
	at com.openwaygroup.appserver.monitoring.logprocessor.application.Application$startProcessing$1$1.invokeSuspend(Application.kt:34)
	at com.openwaygroup.appserver.monitoring.logprocessor.application.Application$startProcessing$1$1.invoke(Application.kt)
	at com.openwaygroup.appserver.monitoring.logprocessor.application.Application$startProcessing$1$1.invoke(Application.kt)
	at kotlinx.coroutines.flow.FlowKt__MergeKt$flatMapConcat$$inlined$map$1$2.emit(Emitters.kt:223)
	at kotlinx.coroutines.flow.SharedFlowImpl.collect$suspendImpl(SharedFlow.kt:372)
	at kotlinx.coroutines.flow.SharedFlowImpl$collect$1.invokeSuspend(SharedFlow.kt)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:840)

The code:

...
val fileInputStream = FileInputStream(file)
val fileId = fileInfoSpec.getFileInformation(fileInputStream.fd) //fileInfoSpec is an interface, implemented for Windows and Posix (see below)
...
//Posix systems:
...
private val posix = POSIXFactory.getPOSIX()
...
override fun getFileInformation(fd: FileDescriptor): String? {
        try {
            val fstat = posix.fstat(fd)
...
//Windows:
    private val windowsPOSIX = POSIXFactory.getNativePOSIX() as WindowsPOSIX
    private val windowsLibC = windowsPOSIX.libc() as WindowsLibC
    private val serialNumberField = WindowsByHandleFileInformation::class.java.getDeclaredField("dwVolumeSerialNumber")
    private val fileIndexHighField = WindowsByHandleFileInformation::class.java.getDeclaredField("nFileIndexHigh")
    private val fileIndexLowField = WindowsByHandleFileInformation::class.java.getDeclaredField("nFileIndexLow")

    init {
        serialNumberField.isAccessible = true
        fileIndexHighField.isAccessible = true
        fileIndexLowField.isAccessible = true
    }
...
override fun getFileInformation(fd: FileDescriptor): String? {
        try {
            val handle = JavaLibCHelper.gethandle(fd)
            if (handle.isValid) {
                val byHandle = WindowsByHandleFileInformation(Runtime.getSystemRuntime())
                if (windowsLibC.GetFileInformationByHandle(handle, byHandle) > 0) {
                  val serialNumber = serialNumberField.get(windowsFileInformation) as Unsigned32
                  val lowIndex = fileIndexLowField.get(windowsFileInformation) as Unsigned32
                  val highIndex = fileIndexHighField.get(windowsFileInformation) as Unsigned32

Could it be related to the reflection warnings I got on Java 11?

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by jnr.posix.JavaLibCHelper$ReflectiveAccess (file:/C:/Users/yshupletsov/.gradle/caches/modules-2/files-2.1/com.github.jnr/jnr-posix/3.1.19/cc55c9e55541895498acdfd59c3145dff91db6e7/jnr-posix-3.1.19.jar) to method sun.nio.ch.SelChImpl.getFD()
WARNING: Please consider reporting this to the maintainers of jnr.posix.JavaLibCHelper$ReflectiveAccess
WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations
WARNING: All illegal access operations will be denied in a future release

Running the code with --add-opens java.base/sun.nio.ch=ALL-UNNAMED --add-opens java.base/java.io=ALL-UNNAMED has no success as well.

[yshupletsov]

Good day,

Any updates on this task?