sqoop1 import 时报错Exception in thread "main" java.lang.NoClassDefFoundError: org/json/JSONObject。下载后，然后放到sqoop/lib目录即可。

ERROR tool.JobTool: I/O error performing job operation: java.io.IOException: Job jjoobb already exists at org.apache.sqoop.metastore.hsqldb.HsqldbJobStorage.create(HsqldbJobStorage.java:373) sqoop的报错

running sqoop:java.lang.NullpointerException问题解决