java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Object.hashCode()' on a null object reference

Searched on Google with the first line of a JAVA stack trace?

We can recommend more relevant solutions and speed up debugging when you paste your entire stack trace with the exception message. Try a sample exception.

Recommended solutions based on your search

Solutions on the web

via GitHub by fesiong
, 9 months ago
Attempt to invoke virtual method 'int java.lang.Object.hashCode()' on a null object reference
via Stack Overflow by Vlad Demyan
, 1 year ago
Attempt to invoke virtual method 'int java.lang.Object.hashCode()' on a null object reference
via Stack Overflow by FilOle
, 2 years ago
Attempt to invoke virtual method 'int java.lang.Object.hashCode()' on a null object reference
via Stack Overflow by John Locke
, 2 years ago
Attempt to invoke virtual method 'int java.lang.Object.hashCode()' on a null object reference
via Stack Overflow by Parth Anjaria
, 1 year ago
Attempt to invoke virtual method 'int java.lang.Object.hashCode()' on a null object reference
via Stack Overflow by Luiz Henrique Ugliano
, 1 year ago
Attempt to invoke virtual method 'int java.lang.Object.hashCode()' on a null object reference
java.lang.NullPointerException: Attempt to invoke virtual method 'int java.lang.Object.hashCode()' on a null object reference
at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:746)
at cn.aigestudio.downloader.bizs.DLManager.dlStop(DLManager.java:267)
at cn.aigestudio.downloader.bizs.DLManager.dlCancel(DLManager.java:286)
at com.seowhy.video.util.CacheUtils.deleteLessonCache(CacheUtils.java:299)
at com.seowhy.video.util.CacheUtils.deleteCourseCache(CacheUtils.java:397)
at com.seowhy.video.adapter.UserCacheApapter$CacheViewHolder.onBtnDeteleClick(UserCacheApapter.java:110)
at com.seowhy.video.adapter.UserCacheApapter$CacheViewHolder$$ViewBinder$2.doClick(UserCacheApapter$CacheViewHolder$$ViewBinder.java:34)

Users with the same issue

3 times, 1 year ago
Samebug visitor profile picture
Unknown user
Once, 1 year ago
Samebug visitor profile picture
Unknown user
Once, 1 year ago
Samebug visitor profile picture
Unknown user
Once, 1 year ago
Samebug visitor profile picture
Unknown user
Once, 1 year ago
21 more bugmates

Know the solutions? Share your knowledge to help other developers to debug faster.