问题
I have been trying to delete a file in windows operating system using the Java IO file.delete() API. However it fails and returns false. The same code works like a charm in Ubuntu.
I have verified that the permissions of the file allows the program to delete it. Also all the input and output stream for the file has been opened as try with resources.
try (InputStream in = new FileInputStream(localFile); OutputStream out = new FileOutputStream(destinationFileName))
Using a debugger I have tested and found out that at the code line that I delete the file it returns true for following API calls.
file.exists()
file.canRead();
file.canWrite();
file.canExecute();
I have even tried adding System.gc() right before calling delete to make sure all the streams are closed.
Not sure whether this is helpful information but I have even tried using the Apache commons FileUtils.forceDelete(file) method and it has also been failed.
So what am I missing here?
Update:
By using Files.delete(Paths.get(file.getAbsolutePath())) I got the following error.
java.nio.file.FileSystemException: C:\Users\thuvvareka\Desktop\temp\in\sd.xml: The process cannot access the file because it is being used by another process.
at sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:86)
at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:97)
at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:102)
at sun.nio.fs.WindowsFileSystemProvider.implDelete(WindowsFileSystemProvider.java:269)
at sun.nio.fs.AbstractFileSystemProvider.delete(AbstractFileSystemProvider.java:103)
at java.nio.file.Files.delete(Files.java:1126)
at org.adroitlogic.x.transport.file.FileMessageInjector.finalizeProcessing(FileMessageInjector.java:161)
at org.adroitlogic.x.transport.file.FileMessageInjector.afterProcess(FileMessageInjector.java:123)
at org.adroitlogic.x.transport.file.FileMessageInjector.afterProcess(FileMessageInjector.java:37)
at org.adroitlogic.x.base.trp.ScheduledMessageInjector.lambda$2(ScheduledMessageInjector.java:72)
at org.adroitlogic.x.api.trp.MessageReceiver.lambda$receive$3(MessageReceiver.java:100)
at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:760)
at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:736)
at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474)
at java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:1962)
at org.adroitlogic.x.core.MessageContext.lambda$createNewResponseFuture$2(MessageContext.java:459)
at java.util.concurrent.CompletableFuture.uniWhenComplete(CompletableFuture.java:760)
at java.util.concurrent.CompletableFuture$UniWhenComplete.tryFire(CompletableFuture.java:736)
at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474)
at java.util.concurrent.CompletableFuture.complete(CompletableFuture.java:1962)
at org.adroitlogic.x.core.MessageContext.completeMessageFlowSuccessfully(MessageContext.java:332)
at org.adroitlogic.x.base.connector.EgressConnectorElement.sendMessage(EgressConnectorElement.java:185)
at org.adroitlogic.x.base.connector.EgressConnectorElement.process(EgressConnectorElement.java:146)
at org.adroitlogic.x.base.processor.AbstractProcessingElement.processMessage(AbstractProcessingElement.java:103)
at org.adroitlogic.x.base.processor.TraceableProcessingElement.processMessage(TraceableProcessingElement.java:53)
at org.adroitlogic.x.base.connector.IngressConnectorElement.receiveMessage(IngressConnectorElement.java:119)
at org.adroitlogic.x.core.IntegrationPlatform.lambda$receive$0(IntegrationPlatform.java:81)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
回答1:
Use Files.delete(filePath) instead of file.delete() as file.delete() has some issue regarding permission on windows.
回答2:
Welcome to Windows.
java.nio.file.FileSystemException: C:\Users\thuvvareka\Desktop\temp\in\sd.xml:
The process cannot access the file because it is being used by another process.
Typically, when a process has a file open in Windows, the operating system locks the file in a way that the file cannot be deleted. If it's your program that has the file open while you are trying to delete it, then close the file first and then delete it. If it's another program that has the file open, then you'll need to figure out who has it open and go from there.
When a process has a file open in Linux, there is typically nothing preventing you from deleting it, which is why you see different behavior.
回答3:
Maybe you can use System.Runtime.exec() to run a terminal / command line command to delete a specific file. This may be somehow platform dependent, but the command to be entered to the exec() function may differ among os properties.
You can check this thread to determine the current os of the java program running.
How do I programmatically determine operating system in Java?
In linux, your line would be as follows:
System.Runtime.exec("rm <path to file>");
回答4:
I ran into this recently. I created a workaround where if file.delete() returns false I check if file.exists() returns true and if so, I wait a bit then try again and give up after some number of tries.
My unproven suspicion is that virus checkers on Windows lock the file to examine the file and waiting allows the virus checker to finish.
// Remove the original file.
if(!file.delete()) {
// wait a bit then retry on Windows
if (file.exists())
{
for (int i = 0; i < 6; i++)
{
Thread.sleep(500);
System.gc();
if (file.delete())
break;
}
来源：https://stackoverflow.com/questions/40706380/failed-to-delete-a-file-in-windows-using-java