从Maven中央仓库网站下载jar包的两种方式，将会伴随java后端开发者的整个职业生涯

wuhdh_:

log4j:WARN No appenders could be found for logger (org.apache.hadoop.metrics2.lib.MutableMetricsFactory).

log4j:WARN Please initialize the log4j system properly.

log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

java.lang.reflect.InvocationTargetException

at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:118)

at java.base/java.lang.reflect.Method.invoke(Method.java:580)

at menu.main(menu.java:30)

Caused by: java.lang.UnsupportedOperationException: getSubject is supported only if a security manager is allowed

at java.base/javax.security.auth.Subject.getSubject(Subject.java:347)

at org.apache.hadoop.security.UserGroupInformation.getCurrentUser(UserGroupInformation.java:568)

at org.apache.hadoop.mapreduce.task.JobContextImpl.(JobContextImpl.java:72)

at org.apache.hadoop.mapreduce.Job.(Job.java:150)

at org.apache.hadoop.mapreduce.Job.getInstance(Job.java:193/

这种报错怎么解决？