CalloutException: you have uncommitted work pending - without DML?
96982
Uncommited work pending when callout in @Queuable,
88546
Can't specify the 'async' modifier on the 'Main' method of a console app
86430
Can anyone explain me over ConcurrentModificationException?
20633
java.lang.IllegalStateException: Cannot (forward | sendRedirect | create session) after response has been committed
130102
Is it possible to call Batch from a future call?
52995
Apex : CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY & SELF_REFERENCE_FROM_TRIGGER
50080
Test class get error System.CalloutException: You have uncommitted work pending. Please commit or rollback before calling out
99130
calling Object.notify() before Object.wait()
136800
DML statement cannot operate on Trigger.new or Trigger.old
106257
What are the possible problems caused by adding elements to unsynchronized ArrayList's object by multiple threads simultaneously?
11090
Uncommitted work pending in unit test with trigger and queueable callout
138618
How to resolve NullPointerException error in my below POM code?
11443
Managed package callout invoked from managed package extension causing test class failure
97429
What can cause "System.CalloutException: You have uncommitted work pending. Please commit or rollback before calling out"?
71407
What to do on TransactionTooLargeException
117920
ConcurrentModificationException Woes
39032
Can't create handler inside thread that has not called Looper.prepare()