無法建立Java Netbeans專案

Question

幾天前，我在構建項目時沒有任何問題。 但是突然我無法訪問lib目錄（SchoolManagement / SchoolManagement / dist / lib）。 我什至無法刪除lib目錄。 它顯示錯誤“訪問被拒絕！”。

輸出日志顯示：

    ant -f C:\\Users\\Dinesh\\Dropbox\\SchoolManagement\\SchoolManagement -   Dnb.internal.action.name=rebuild clean jar
    init:
    deps-clean:
    Deleting directory    C:\Users\Dinesh\Dropbox\SchoolManagement\SchoolManagement\build
    clean:
    init:
    deps-jar:
    Created dir: C:\Users\Dinesh\Dropbox\SchoolManagement\SchoolManagement\build\classes
    Created dir: C:\Users\Dinesh\Dropbox\SchoolManagement\SchoolManagement\build\empty
    Created dir: C:\Users\Dinesh\Dropbox\SchoolManagement\SchoolManagement\build\generated-sources\ap-source-output
    Compiling 14 source files to C:\Users\Dinesh\Dropbox\SchoolManagement\SchoolManagement\build\classes
    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:\Users\Dinesh\Dropbox\SchoolManagement\SchoolManagement\build\classes
compile:
    Copying 1 file to C:\Users\Dinesh\Dropbox\SchoolManagement\SchoolManagement\build
    Copy libraries to C:\Users\Dinesh\Dropbox\SchoolManagement\SchoolManagement\dist\lib.
C:\Users\Dinesh\Dropbox\SchoolManagement\SchoolManagement\nbproject\build-impl.xml:993: The following error occurred while executing this line:
C:\Users\Dinesh\Dropbox\SchoolManagement\SchoolManagement\nbproject\build-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)

Answer 1

好的，首先，我們可能需要查看確切的代碼行，以防萬一出現空指針錯誤，但是這可能是由於無法訪問目錄所致，具體取決於您對NetBeans對C：/驅動器的特權。

可能的解決方案

如果Netbeans無法刪除目錄，則您可能想嘗試以管理員身份運行netbeans以具有所需的特權（右鍵單擊並以admin身份運行），然后它可能會工作。 也似乎有一個空指針異常，但這可能是由於缺少特權

其他解決方案

由於這是一個學校項目，因此如果您在學校計算機上運行，​​則在某種程度上假設他們可能給了您一個沒有特權的帳戶，這可能是問題所在，那么您可以嘗試復制文件手動移至您的帳戶確實具有讀/寫權限的新位置。