During building I accasionally get the following error. Removing the target folder is still possible and after removing the build succeeds again. It seems to be independent of which project I build.

My Spoofax version is 2.5.3

12:28 | ERROR | o.m.s.e.m.b.CompileBuilder     - Exception thrown during build
org.metaborg.core.MetaborgException: java.nio.file.FileSystemException: <project>\target\pluto\generate-sources.dep: The process cannot access the file because it is being used by another process.

	at org.metaborg.spoofax.meta.core.build.LanguageSpecBuilder.compile(LanguageSpecBuilder.java:150) ~[org.metaborg.spoofax.meta.core_2.5.3.jar:na]
	at org.metaborg.spoofax.eclipse.meta.build.CompileBuilder$1.run(CompileBuilder.java:49) ~[org.metaborg.spoofax.eclipse.meta_2.5.3.jar:na]
	at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2289) [org.eclipse.core.resources_3.13.0.v20180512-1138.jar:na]
	at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:2316) [org.eclipse.core.resources_3.13.0.v20180512-1138.jar:na]
	at org.metaborg.spoofax.eclipse.meta.build.CompileBuilder.build(CompileBuilder.java:69) [org.metaborg.spoofax.eclipse.meta_2.5.3.jar:na]
	at org.metaborg.spoofax.eclipse.meta.build.Builder.build(Builder.java:53) [org.metaborg.spoofax.eclipse.meta_2.5.3.jar:na]
	at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:795) [org.eclipse.core.resources_3.13.0.v20180512-1138.jar:na]
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) [org.eclipse.equinox.common_3.10.0.v20180412-1130.jar:na]
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:216) [org.eclipse.core.resources_3.13.0.v20180512-1138.jar:na]
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:259) [org.eclipse.core.resources_3.13.0.v20180512-1138.jar:na]
	at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:312) [org.eclipse.core.resources_3.13.0.v20180512-1138.jar:na]
	at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:42) [org.eclipse.equinox.common_3.10.0.v20180412-1130.jar:na]
	at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:315) [org.eclipse.core.resources_3.13.0.v20180512-1138.jar:na]
	at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:367) [org.eclipse.core.resources_3.13.0.v20180512-1138.jar:na]
	at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:388) [org.eclipse.core.resources_3.13.0.v20180512-1138.jar:na]
	at org.eclipse.core.internal.resources.Workspace.buildInternal(Workspace.java:501) [org.eclipse.core.resources_3.13.0.v20180512-1138.jar:na]
	at org.eclipse.core.internal.resources.Workspace.build(Workspace.java:401) [org.eclipse.core.resources_3.13.0.v20180512-1138.jar:na]
	at org.eclipse.ui.actions.GlobalBuildAction$1.run(GlobalBuildAction.java:177) [org.eclipse.ui.ide_3.14.0.v20180517-1842.jar:na]
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:60) [org.eclipse.core.jobs_3.10.0.v20180427-1454.jar:na]
Caused by: java.nio.file.FileSystemException: <project>\target\pluto\generate-sources.dep: The process cannot access the file because it is being used by another process.

	at sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:86) ~[na:1.8.0_162]
	at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:97) ~[na:1.8.0_162]
	at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:102) ~[na:1.8.0_162]
	at sun.nio.fs.WindowsFileSystemProvider.implDelete(WindowsFileSystemProvider.java:269) ~[na:1.8.0_162]
	at sun.nio.fs.AbstractFileSystemProvider.delete(AbstractFileSystemProvider.java:103) ~[na:1.8.0_162]
	at java.nio.file.Files.delete(Files.java:1126) ~[na:1.8.0_162]
	at build.pluto.PersistableEntity.read(PersistableEntity.java:131) ~[pluto-1.11.0.jar:na]
	at build.pluto.BuildUnit.read(BuildUnit.java:69) ~[pluto-1.11.0.jar:na]
	at build.pluto.builder.BuildManager.require(BuildManager.java:295) ~[pluto-1.11.0.jar:na]
	at build.pluto.builder.BuildManager.requireInitially(BuildManager.java:262) ~[pluto-1.11.0.jar:na]
	at org.metaborg.spoofax.meta.core.build.LanguageSpecBuilder.plutoBuild(LanguageSpecBuilder.java:324) ~[org.metaborg.spoofax.meta.core_2.5.3.jar:na]
	at org.metaborg.spoofax.meta.core.build.LanguageSpecBuilder.compile(LanguageSpecBuilder.java:140) ~[org.metaborg.spoofax.meta.core_2.5.3.jar:na]
Submitted by Gerben Oolbekkink on 20 May 2019 at 13:28

On 11 June 2019 at 15:05 Jeff Smits commented:

This bug has a proposed fix which may make it into the next Spoofax release: https://github.com/pluto-build/pluto/pull/13

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