NetBeans: java.nio.file.AccessDeniedException thrown when copying jars to your library

After you have your coding done, you do a Clean and Build, and you see the following error message in your Output pane.

Copy libraries to C:\MyProjects\lib.
Attempt to copy C:\dynamicreports-3.2.0\lib\xalan-2.7.1.jar to C:\MyProjects\lib\xalan-2.7.1.jar using NIO Channels failed due to 'C:\MyProjects\lib\xalan-2.7.1.jar'.  Falling back to streams.
C:\MyProjects\nbproject\build-impl.xml:1212: The following error occurred while executing this line:
C:\MyProjects\nbproject\build-impl.xml:1035:
java.nio.file.AccessDeniedException: C:\MyProjects\lib\xalan-2.7.1.jar
at sun.nio.fs.WindowsException.translateToIOException(WindowsException.java:83)
at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:97)
at sun.nio.fs.WindowsException.rethrowAsIOException(WindowsException.java:102)
at sun.nio.fs.WindowsFileSystemProvider.newByteChannel(WindowsFileSystemProvider.java:230)
at java.nio.file.spi.FileSystemProvider.newOutputStream(FileSystemProvider.java:434)
at java.nio.file.Files.newOutputStream(Files.java:216)
at org.apache.tools.ant.util.FileUtils.newOutputStream(FileUtils.java:1721)
at org.apache.tools.ant.types.resources.FileResource.getOutputStream(FileResource.java:267)
at org.apache.tools.ant.types.resources.FileResource.getOutputStream(FileResource.java:241)
at org.apache.tools.ant.util.ResourceUtils.getOutputStream(ResourceUtils.java:791)
at org.apache.tools.ant.util.ResourceUtils.copyUsingStreams(ResourceUtils.java:765)
at org.apache.tools.ant.util.ResourceUtils.copyResource(ResourceUtils.java:435)
at org.apache.tools.ant.util.FileUtils.copyFile(FileUtils.java:565)
at org.apache.tools.ant.util.FileUtils.copyFile(FileUtils.java:525)
at org.apache.tools.ant.util.FileUtils.copyFile(FileUtils.java:486)
at org.apache.tools.ant.util.FileUtils.copyFile(FileUtils.java:449)
at org.apache.tools.ant.util.FileUtils.copyFile(FileUtils.java:415)
at org.apache.tools.ant.util.FileUtils.copyFile(FileUtils.java:390)
at org.apache.tools.ant.util.FileUtils.copyFile(FileUtils.java:328)
at org.netbeans.modules.java.j2seproject.copylibstask.CopyLibs.execute(CopyLibs.java:218)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
at sun.reflect.GeneratedMethodAccessor172.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:99)
at org.apache.tools.ant.Task.perform(Task.java:350)
at java.util.Vector.forEach(Vector.java:1275)
at org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:67)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
at sun.reflect.GeneratedMethodAccessor172.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:99)
at org.apache.tools.ant.Task.perform(Task.java:350)
at org.apache.tools.ant.taskdefs.MacroInstance.execute(MacroInstance.java:391)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
at sun.reflect.GeneratedMethodAccessor172.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:99)
at org.apache.tools.ant.Task.perform(Task.java:350)
at org.apache.tools.ant.Target.execute(Target.java:449)
at org.apache.tools.ant.Target.performTasks(Target.java:470)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1388)
at org.apache.tools.ant.Project.executeTarget(Project.java:1361)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1251)
at org.apache.tools.ant.module.bridge.impl.BridgeImpl.run(BridgeImpl.java:261)
at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:574)
at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:128)

To fix this problem, do one of the following.

1. Change the accessibility of your library folder.
     Right-click on the folder and select Properties. In the pop-up window, select the Security tab.               Select each group of users, click the Edit button to change their permission to access this folder.
2. Run your NetBeans as Administrator.
    Righ-click on your NetBeans icon and select Run as administrator.

3. Remove all the unused jar files from the lib directory.

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