國內找不到問題解答,這時候就得google上了,stackoverflow上答案java
http://stackoverflow.com/questions/23078500/maven-throws-nullpointer-exception apache
[INFO] Scanning for projects...[ERROR] Internal error: java.lang.NullPointerException -> [Help 1]org.apache.maven.InternalErrorException: Internal error: java.lang.NullPointerException at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:167) at org.apache.maven.cli.MavenCli.execute(MavenCli.java:584)
You have a cyclic reference of dependencies.maven
It looks like your crm-core project has crm-data in its dependencies and the crm-data project has crm-core in its dependencies.google
Maven can't compile such a case.spa