java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object java.lang.ref.WeakReference.get()'

yuweiguocn / GreenDaoUpgradeHelper

To solve database upgrade of greenDao and just need one line code

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java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object java.lang.ref.WeakReference.get()' #44

Closed ace2014 closed 6 years ago

ace2014 commented 6 years ago

java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Object java.lang.ref.WeakReference.get()' on a null object reference at com.github.yuweiguocn.library.greendao.MigrationHelper.migrate(MigrationHelper.java:62)