An internal error occurred during: "Update classpath Job"

When clicking the refresh button on "Referenced Libraries", the output console gives this error.

[Error - 11:05:36 p.m.] Dec. 9, 2021, 11:05:36 p.m. An internal error occurred during: "Update classpath Job".
null
java.lang.NullPointerException
	at org.eclipse.jdt.ls.core.internal.ProjectUtils.resolveGlobPath(ProjectUtils.java:481)
	at org.eclipse.jdt.ls.core.internal.ProjectUtils.groupGlobsByPrefix(ProjectUtils.java:492)
	at org.eclipse.jdt.ls.core.internal.ProjectUtils.collectBinaries(ProjectUtils.java:424)
	at org.eclipse.jdt.ls.core.internal.managers.UpdateClasspathJob.doUpdateClasspath(UpdateClasspathJob.java:96)
	at org.eclipse.jdt.ls.core.internal.managers.UpdateClasspathJob.runInWorkspace(UpdateClasspathJob.java:82)
	at org.eclipse.core.internal.resources.InternalWorkspaceJob.run(InternalWorkspaceJob.java:42)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63)

通过刷新 Referenced Libraries 重现该错误，然后检查 ProjectUtils.java 中的 resolveGlobPath、groupGlobsByPrefix 和 collectBinaries，接着检查 UpdateClasspathJob.java。跟踪堆栈跟踪中显示的 null 值，并验证刷新 classpath 不再引发报告的 NullPointerException。