我有Jetty服务器目录并手动将war文件复制到/ webapps目录但是当我从命令提示符运行start.jar时，我收到以下错误。我也为PATH变量设置了JETTY_HOME。
2017-02-09 12:28:48.940:INFO::main: Logging initialized @871ms
2017-02-09 12:28:49.010:WARN:oejs.HomeBaseWarning:main: This instance of Jetty i
s not running from a separate {jetty.base} directory, this is not recommended.
See documentation at http://www.eclipse.org/jetty/documentation/current/startup.
html
2017-02-09 12:28:49.220:INFO:oejs.Server:main: jetty-9.3.16.v20170120
2017-02-09 12:28:49.240:INFO:oejdp.ScanningAppProvider:main: Deployment monitor
[file:///C:/Users/u458714/Desktop/jetty-distribution-9.3.16.v20170120/webapps/]
at interval 1
2017-02-09 12:28:54.743:INFO:oeja.AnnotationConfiguration:main: Scanning elapsed
time=3354ms
2017-02-09 12:28:55.192:INFO:C.0:main: No Spring WebApplicationInitializer types
detected on classpath
Feb 09, 2017 12:28:56 PM com.google.inject.internal.MessageProcessor visit
INFO: An exception was caught and reported. Message: java.lang.NullPointerExcept
ion
java.lang.NullPointerException
at com.wellsfargo.wria2.environment.EnvironmentModule.configure(Environm
entModule.java:74)
at com.google.inject.AbstractModule.configure(AbstractModule.java:59)
at com.google.inject.spi.Elements$RecordingBinder.install(Elements.java:
223)
at com.google.inject.AbstractModule.install(AbstractModule.java:118)
at com.wellsfargo.wria2.taglib.CoreRendererModule.configure(CoreRenderer
Module.java:25)
at com.google.inject.AbstractModule.configure(AbstractModule.java:59)
at com.google.inject.spi.Elements$RecordingBinder.install(Elements.java:
223)
at com.google.inject.AbstractModule.install(AbstractModule.java:118)
at com.wellsfargo.wria2.taglib.Wria2JspTagLibraryModule.configure(Wria2J
spTagLibraryModule.java:18)
at com.google.inject.AbstractModule.configure(AbstractModule.java:59)
at com.google.inject.spi.Elements$RecordingBinder.install(Elements.java:
223)
at com.google.inject.spi.Elements.getElements(Elements.java:101)
at com.google.inject.internal.InjectorShell$Builder.build(InjectorShell.
java:133)
at com.google.inject.internal.InternalInjectorCreator.build(InternalInje
ctorCreator.java:103)
at com.google.inject.Guice.createInjector(Guice.java:95)
at com.google.inject.Guice.createInjector(Guice.java:72)
at com.wellsfargo.wria2.jsp.WT2ServletContextListener.contextInitialized
(WT2ServletContextListener.java:94)
at org.eclipse.jetty.server.handler.ContextHandler.callContextInitialize
d(ContextHandler.java:843)
at org.eclipse.jetty.servlet.ServletContextHandler.callContextInitialize
d(ServletContextHandler.java:533)
at org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextH
andler.java:816)
at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletC
ontextHandler.java:345)
at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java
:1404)
at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.jav
a:1366)
at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandle
r.java:778)
at org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContex
tHandler.java:262)
at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:520
)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLife
Cycle.java:68)
at org.eclipse.jetty.deploy.bindings.StandardStarter.processBinding(Stan
dardStarter.java:41)
at org.eclipse.jetty.deploy.AppLifeCycle.runBindings(AppLifeCycle.java:1
88)
at org.eclipse.jetty.deploy.DeploymentManager.requestAppGoal(DeploymentM
anager.java:499)
at org.eclipse.jetty.deploy.DeploymentManager.addApp(DeploymentManager.j
ava:147)
at org.eclipse.jetty.deploy.providers.ScanningAppProvider.fileAdded(Scan
ningAppProvider.java:180)
at org.eclipse.jetty.deploy.providers.WebAppProvider.fileAdded(WebAppPro
vider.java:452)
at org.eclipse.jetty.deploy.providers.ScanningAppProvider$1.fileAdded(Sc
anningAppProvider.java:64)
at org.eclipse.jetty.util.Scanner.reportAddition(Scanner.java:610)
at org.eclipse.jetty.util.Scanner.reportDifferences(Scanner.java:529)
at org.eclipse.jetty.util.Scanner.scan(Scanner.java:392)
at org.eclipse.jetty.util.Scanner.doStart(Scanner.java:313)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLife
Cycle.java:68)
at org.eclipse.jetty.deploy.providers.ScanningAppProvider.doStart(Scanni
ngAppProvider.java:150)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLife
Cycle.java:68)
at org.eclipse.jetty.deploy.DeploymentManager.startAppProvider(Deploymen
tManager.java:561)
at org.eclipse.jetty.deploy.DeploymentManager.doStart(DeploymentManager.
java:236)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLife
Cycle.java:68)
at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLi
feCycle.java:131)
at org.eclipse.jetty.server.Server.start(Server.java:422)
at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(Container
LifeCycle.java:113)
at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHand
ler.java:61)
at org.eclipse.jetty.server.Server.doStart(Server.java:389)
at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLife
Cycle.java:68)
at org.eclipse.jetty.xml.XmlConfiguration$1.run(XmlConfiguration.java:15
16)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.jetty.xml.XmlConfiguration.main(XmlConfiguration.java:144
1)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.
java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces
sorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.eclipse.jetty.start.Main.invokeMain(Main.java:214)
at org.eclipse.jetty.start.Main.start(Main.java:457)
at org.eclipse.jetty.start.Main.main(Main.java:75)