我试图在CentOS VM上设置一个oracle用户，但是我丢失了很多命令，例如'ls'，'env'，'apt'，...
在会话期间，我尝试使用'sudo lsnrctl stop'和'sudo lsnrctl start'重新启动oracle服务。该服务无法再次启动。
因此，我关闭了会话，开始新的会话时，终端上的许多命令消失了。
错误是
2019-05-16 11:36:17.936 WARN 11584 --- [nio-8889-exec-9] a.d.s.JwtAuthorizationTokenFilter : couldn't find bearer string, will ignore the header
2019-05-16 11:36:17.937 ERROR 11584 --- [nio-8889-exec-9] a.d.s.JwtAuthorizationTokenFilter : an error occured during getting username from token
java.lang.IllegalArgumentException: JWT String argument cannot be null or empty.
at io.jsonwebtoken.lang.Assert.hasText(Assert.java:135) ~[jjwt-0.9.0.jar:0.9.0]
at io.jsonwebtoken.impl.DefaultJwtParser.parse(DefaultJwtParser.java:479) ~[jjwt-0.9.0.jar:0.9.0]
at io.jsonwebtoken.impl.DefaultJwtParser.parseClaimsJws(DefaultJwtParser.java:541) ~[jjwt-0.9.0.jar:0.9.0]
at package.security.JwtTokenUtil.getAllClaimsFromToken(JwtTokenUtil.java:59) ~[classes/:na]
at package.security.JwtTokenUtil.getClaimFromToken(JwtTokenUtil.java:52) ~[classes/:na]
at package.security.JwtTokenUtil.getUsernameFromToken(JwtTokenUtil.java:34) ~[classes/:na]
at package.security.JwtAuthorizationTokenFilter.extractUsername(JwtAuthorizationTokenFilter.java:79) [classes/:na]
at package.security.JwtAuthorizationTokenFilter.doFilterInternal(JwtAuthorizationTokenFilter.java:44) [classes/:na]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.11.RELEASE.jar:4.3.11.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) [spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:116) [spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
...
at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:105) [spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) [spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:56) [spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-4.3.11.RELEASE.jar:4.3.11.RELEASE]
at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:331) [spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:214) [spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:177) [spring-security-web-4.2.3.RELEASE.jar:4.2.3.RELEASE]
at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346) [spring-web-4.3.11.RELEASE.jar:4.3.11.RELEASE]
at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262) [spring-web-4.3.11.RELEASE.jar:4.3.11.RELEASE]
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.20.jar:8.5.20]
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.20.jar:8.5.20]
at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) [spring-web-4.3.11.RELEASE.jar:4.3.11.RELEASE]
...
at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:799) [tomcat-embed-core-8.5.20.jar:8.5.20]
at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.20.jar:8.5.20]
at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:868) [tomcat-embed-core-8.5.20.jar:8.5.20]
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1457) [tomcat-embed-core-8.5.20.jar:8.5.20]
at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.20.jar:8.5.20]
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) [na:1.8.0_201]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) [na:1.8.0_201]
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.20.jar:8.5.20]
at java.lang.Thread.run(Unknown Source) [na:1.8.0_201]