几天前，我在构建项目时没有遇到任何问题。但是突然我不能访问lib目录(SchoolManagement/SchoolManagement/dist/lib)。我甚至不能删除lib目录。显示错误"Access Denied!"
输出日志显示:
ant -f C:\Users\Dinesh\Dropbox\SchoolManagement\SchoolManagement - Dnb.internal.action.name=rebuild clean jar
init:
deps-clean:
Deleting directory C:UsersDineshDropboxSchoolManagementSchoolManagementbuild
clean:
init:
deps-jar:
Created dir: C:UsersDineshDropboxSchoolManagementSchoolManagementbuildclasses
Created dir: C:UsersDineshDropboxSchoolManagementSchoolManagementbuildempty
Created dir: C:UsersDineshDropboxSchoolManagementSchoolManagementbuildgenerated-sourcesap-source-output
Compiling 14 source files to C:UsersDineshDropboxSchoolManagementSchoolManagementbuildclasses
Note: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
Copying 2 files to C:UsersDineshDropboxSchoolManagementSchoolManagementbuildclasses
compile:
Copying 1 file to C:UsersDineshDropboxSchoolManagementSchoolManagementbuild
Copy libraries to C:UsersDineshDropboxSchoolManagementSchoolManagementdistlib.
C:UsersDineshDropboxSchoolManagementSchoolManagementnbprojectbuild-impl.xml:993: The following error occurred while executing this line:
C:UsersDineshDropboxSchoolManagementSchoolManagementnbprojectbuild-impl.xml:837:
java.lang.NullPointerException
at org.apache.tools.ant.util.ResourceUtils.copyResource(ResourceUtils.java:439)
at org.apache.tools.ant.util.FileUtils.copyFile(FileUtils.java:559)
at org.apache.tools.ant.util.FileUtils.copyFile(FileUtils.java:519)
at org.apache.tools.ant.util.FileUtils.copyFile(FileUtils.java:480)
at org.apache.tools.ant.util.FileUtils.copyFile(FileUtils.java:443)
at org.apache.tools.ant.util.FileUtils.copyFile(FileUtils.java:409)
at org.apache.tools.ant.util.FileUtils.copyFile(FileUtils.java:384)
at org.apache.tools.ant.util.FileUtils.copyFile(FileUtils.java:322)
at org.netbeans.modules.java.j2seproject.copylibstask.CopyLibs.execute(CopyLibs.java:206)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
at sun.reflect.GeneratedMethodAccessor103.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.taskdefs.Sequential.execute(Sequential.java:68)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
at sun.reflect.GeneratedMethodAccessor103.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.taskdefs.MacroInstance.execute(MacroInstance.java:396)
at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
at sun.reflect.GeneratedMethodAccessor103.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:483)
at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
at org.apache.tools.ant.Task.perform(Task.java:348)
at org.apache.tools.ant.Target.execute(Target.java:435)
at org.apache.tools.ant.Target.performTasks(Target.java:456)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1393)
at org.apache.tools.ant.Project.executeTarget(Project.java:1364)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1248)
at org.apache.tools.ant.module.bridge.impl.BridgeImpl.run(BridgeImpl.java:286)
at org.apache.tools.ant.module.run.TargetExecutor.run(TargetExecutor.java:555)
at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:153)
BUILD FAILED (total time: 28 seconds)
好吧，首先我们可能需要看到确切的代码行，以防有一个空指针错误，但这可能是由于无法访问您的目录，这取决于您的Netbeans对C:/驱动器的权限。
可能的解决方案
如果Netbeans不能删除目录，你可能想尝试以管理员身份运行Netbeans以获得所需的特权(右键单击并以admin身份运行)，然后它可能会起作用。似乎还有一个空指针异常，但这可能是因为缺乏权限
其他解决方案
由于这是一个学校的项目，如果你在学校的电脑上运行，我将假设在某种程度上，他们可能给了你一个没有提升特权的帐户，这可能是问题所在，你可以尝试手动将文件复制到一个新的位置，你的帐户确实有读/写的特权。