在监听器中监听take事件，完成任务后，为下个任务设置候选人。完成之后获取下个任务，得到的任务还是刚才完成的任务。

1.继承ExecutionListener 监听take事件。
2.在监听器完成当前任务，获取下个任务竟然还是刚才完成的任务？
图片描述

两个任务id一样，导致后面的流程不对。报错如下
2020-08-18 14:46:09.593 [threadPoolTaskScheduler-1] ERROR druid.sql.Statement:149 - {conn-10003, pstmt-20174} execute error. delete from ACT_RU_TASK where ID_ = ? and REV_ = ?
com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (mgmtpf_jeecgboot.ACT_RU_IDENTITYLINK, CONSTRAINT ACT_FK_TSKASS_TASK FOREIGN KEY (TASK_ID_) REFERENCES ACT_RU_TASK (ID_))
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
at com.mysql.jdbc.Util.getInstance(Util.java:408)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:936)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3978)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3914)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2530)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2683)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2495)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1903)
at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1242)
at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:3409)
at com.alibaba.druid.filter.FilterEventAdapter.preparedStatement_execute(FilterEventAdapter.java:440)
at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:3407)
at com.alibaba.druid.wall.WallFilter.preparedStatement_execute(WallFilter.java:627)
at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:3407)
at com.alibaba.druid.filter.FilterEventAdapter.preparedStatement_execute(FilterEventAdapter.java:440)
at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:3407)
at com.alibaba.druid.proxy.jdbc.PreparedStatementProxyImpl.execute(PreparedStatementProxyImpl.java:167)
at com.alibaba.druid.pool.DruidPooledPreparedStatement.execute(DruidPooledPreparedStatement.java:497)
at org.apache.ibatis.executor.statement.PreparedStatementHandler.update(PreparedStatementHandler.java:47)
at org.apache.ibatis.executor.statement.RoutingStatementHandler.update(RoutingStatementHandler.java:74)
at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:50)
at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:117)
at org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:76)
at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:197)
at org.apache.ibatis.session.defaults.DefaultSqlSession.delete(DefaultSqlSession.java:212)
at org.activiti.engine.impl.db.DbSqlSession.flushDeleteEntities(DbSqlSession.java:770)
at org.activiti.engine.impl.db.DbSqlSession.flushDeletes(DbSqlSession.java:733)
at org.activiti.engine.impl.db.DbSqlSession.flush(DbSqlSession.java:419)
at org.activiti.engine.impl.interceptor.CommandContext.flushSessions(CommandContext.java:197)
at org.activiti.engine.impl.interceptor.CommandContext.close(CommandContext.java:75)
at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:72)
at org.activiti.spring.SpringTransactionInterceptor $1 . d o I n T r a n s a c t i o n (S p r i n g T r a n s a c t i o n I n t e r c e p t o r . j a v a : 47) a t o r g . s p r i n g f r a m e w o r k . t r a n s a c t i o n . s u p p o r t . T r a n s a c t i o n T e m p l a t e . e x e c u t e (T r a n s a c t i o n T e m p l a t e . j a v a : 140) a t o r g . a c t i v i t i . s p r i n g . S p r i n g T r a n s a c t i o n I n t e r c e p t o r . e x e c u t e (S p r i n g T r a n s a c t i o n I n t e r c e p t o r . j a v a : 45) a t o r g . a c t i v i t i . e n g i n e . i m p l . i n t e r c e p t o r . L o g I n t e r c e p t o r . e x e c u t e (L o g I n t e r c e p t o r . j a v a : 29) a t o r g . a c t i v i t i . e n g i n e . i m p l . c f g . C o m m a n d E x e c u t o r I m p l . e x e c u t e (C o m m a n d E x e c u t o r I m p l . j a v a : 44) a t o r g . a c t i v i t i . e n g i n e . i m p l . c f g . C o m m a n d E x e c u t o r I m p l . e x e c u t e (C o m m a n d E x e c u t o r I m p l . j a v a : 39) a t o r g . a c t i v i t i . e n g i n e . i m p l . a s y n c e x e c u t o r . E x e c u t e A s y n c R u n n a b l e . e x e c u t e J o b (E x e c u t e A s y n c R u n n a b l e . j a v a : 97) a t o r g . a c t i v i t i . e n g i n e . i m p l . a s y n c e x e c u t o r . E x e c u t e A s y n c R u n n a b l e . r u n (E x e c u t e A s y n c R u n n a b l e . j a v a : 75) a t o r g . s p r i n g f r a m e w o r k . s c h e d u l i n g . s u p p o r t . D e l e g a t i n g E r r o r H a n d l i n g R u n n a b l e . r u n (D e l e g a t i n g E r r o r H a n d l i n g R u n n a b l e . j a v a : 54) a t j a v a . u t i l . c o n c u r r e n t . E x e c u t o r s$ RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run$$ $c a p t u r e (F u t u r e T a s k . j a v a : 266) a t j a v a . u t i l . c o n c u r r e n t . F u t u r e T a s k . r u n (F u t u r e T a s k . j a v a) a t j a v a . u t i l . c o n c u r r e n t . S c h e d u l e d T h r e a d P o o l E x e c u t o r$ ScheduledFutureTask.access $201 (S c h e d u l e d T h r e a d P o o l E x e c u t o r . j a v a : 180) a t j a v a . u t i l . c o n c u r r e n t . S c h e d u l e d T h r e a d P o o l E x e c u t o r$ ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
2020-08-18 14:46:09.600 [threadPoolTaskScheduler-1] ERROR o.activiti.engine.impl.interceptor.CommandContext:122 - Error while closing command context
org.apache.ibatis.exceptions.PersistenceException:

Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (`mgmtpf_jeecgboot`.`ACT_RU_IDENTITYLINK`, CONSTRAINT `ACT_FK_TSKASS_TASK` FOREIGN KEY (`TASK_ID_`) REFERENCES `ACT_RU_TASK` (`ID_`))

The error may exist in org/activiti/db/mapping/entity/Task.xml

The error may involve org.activiti.engine.impl.persistence.entity.TaskEntityImpl.deleteTask-Inline

The error occurred while setting parameters

SQL: delete from ACT_RU_TASK where ID_ = ? and REV_ = ?

Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (`mgmtpf_jeecgboot`.`ACT_RU_IDENTITYLINK`, CONSTRAINT `ACT_FK_TSKASS_TASK` FOREIGN KEY (`TASK_ID_`) REFERENCES `ACT_RU_TASK` (`ID_`))

at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:199)
at org.apache.ibatis.session.defaults.DefaultSqlSession.delete(DefaultSqlSession.java:212)
at org.activiti.engine.impl.db.DbSqlSession.flushDeleteEntities(DbSqlSession.java:770)
at org.activiti.engine.impl.db.DbSqlSession.flushDeletes(DbSqlSession.java:733)
at org.activiti.engine.impl.db.DbSqlSession.flush(DbSqlSession.java:419)
at org.activiti.engine.impl.interceptor.CommandContext.flushSessions(CommandContext.java:197)
at org.activiti.engine.impl.interceptor.CommandContext.close(CommandContext.java:75)
at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:72)
at org.activiti.spring.SpringTransactionInterceptor$1.doInTransaction(SpringTransactionInterceptor.java:47)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:140)
at org.activiti.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:45)
at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:29)
at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:44)
at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:39)
at org.activiti.engine.impl.asyncexecutor.ExecuteAsyncRunnable.executeJob(ExecuteAsyncRunnable.java:97)
at org.activiti.engine.impl.asyncexecutor.ExecuteAsyncRunnable.run(ExecuteAsyncRunnable.java:75)
at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)
at java.util.concurrent.FutureTask.run(FutureTask.java)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (mgmtpf_jeecgboot.ACT_RU_IDENTITYLINK, CONSTRAINT ACT_FK_TSKASS_TASK FOREIGN KEY (TASK_ID_) REFERENCES ACT_RU_TASK (ID_))
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
at com.mysql.jdbc.Util.getInstance(Util.java:408)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:936)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3978)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3914)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2530)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2683)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2495)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1903)
at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1242)
at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:3409)
at com.alibaba.druid.filter.FilterEventAdapter.preparedStatement_execute(FilterEventAdapter.java:440)
at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:3407)
at com.alibaba.druid.wall.WallFilter.preparedStatement_execute(WallFilter.java:627)
at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:3407)
at com.alibaba.druid.filter.FilterEventAdapter.preparedStatement_execute(FilterEventAdapter.java:440)
at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:3407)
at com.alibaba.druid.proxy.jdbc.PreparedStatementProxyImpl.execute(PreparedStatementProxyImpl.java:167)
at com.alibaba.druid.pool.DruidPooledPreparedStatement.execute(DruidPooledPreparedStatement.java:497)
at org.apache.ibatis.executor.statement.PreparedStatementHandler.update(PreparedStatementHandler.java:47)
at org.apache.ibatis.executor.statement.RoutingStatementHandler.update(RoutingStatementHandler.java:74)
at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:50)
at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:117)
at org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:76)
at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:197)
… 24 common frames omitted
2020-08-18 14:46:09.677 [threadPoolTaskScheduler-1] ERROR o.a.engine.impl.asyncexecutor.ExecuteAsyncRunnable:115 - Job 395013 failed
org.apache.ibatis.exceptions.PersistenceException:

Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (`mgmtpf_jeecgboot`.`ACT_RU_IDENTITYLINK`, CONSTRAINT `ACT_FK_TSKASS_TASK` FOREIGN KEY (`TASK_ID_`) REFERENCES `ACT_RU_TASK` (`ID_`))

The error may exist in org/activiti/db/mapping/entity/Task.xml

The error may involve org.activiti.engine.impl.persistence.entity.TaskEntityImpl.deleteTask-Inline

The error occurred while setting parameters

SQL: delete from ACT_RU_TASK where ID_ = ? and REV_ = ?

Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (`mgmtpf_jeecgboot`.`ACT_RU_IDENTITYLINK`, CONSTRAINT `ACT_FK_TSKASS_TASK` FOREIGN KEY (`TASK_ID_`) REFERENCES `ACT_RU_TASK` (`ID_`))

at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:199)
at org.apache.ibatis.session.defaults.DefaultSqlSession.delete(DefaultSqlSession.java:212)
at org.activiti.engine.impl.db.DbSqlSession.flushDeleteEntities(DbSqlSession.java:770)
at org.activiti.engine.impl.db.DbSqlSession.flushDeletes(DbSqlSession.java:733)
at org.activiti.engine.impl.db.DbSqlSession.flush(DbSqlSession.java:419)
at org.activiti.engine.impl.interceptor.CommandContext.flushSessions(CommandContext.java:197)
at org.activiti.engine.impl.interceptor.CommandContext.close(CommandContext.java:75)
at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:72)
at org.activiti.spring.SpringTransactionInterceptor$1.doInTransaction(SpringTransactionInterceptor.java:47)
at org.springframework.transaction.support.TransactionTemplate.execute(TransactionTemplate.java:140)
at org.activiti.spring.SpringTransactionInterceptor.execute(SpringTransactionInterceptor.java:45)
at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:29)
at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:44)
at org.activiti.engine.impl.cfg.CommandExecutorImpl.execute(CommandExecutorImpl.java:39)
at org.activiti.engine.impl.asyncexecutor.ExecuteAsyncRunnable.executeJob(ExecuteAsyncRunnable.java:97)
at org.activiti.engine.impl.asyncexecutor.ExecuteAsyncRunnable.run(ExecuteAsyncRunnable.java:75)
at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run$$$capture(FutureTask.java:266)
at java.util.concurrent.FutureTask.run(FutureTask.java)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)

Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (mgmtpf_jeecgboot.ACT_RU_IDENTITYLINK, CONSTRAINT ACT_FK_TSKASS_TASK FOREIGN KEY (TASK_ID_) REFERENCES ACT_RU_TASK (ID_))
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:423)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
at com.mysql.jdbc.Util.getInstance(Util.java:408)
at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:936)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3978)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3914)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2530)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2683)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2495)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:1903)
at com.mysql.jdbc.PreparedStatement.execute(PreparedStatement.java:1242)
at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:3409)
at com.alibaba.druid.filter.FilterEventAdapter.preparedStatement_execute(FilterEventAdapter.java:440)
at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:3407)
at com.alibaba.druid.wall.WallFilter.preparedStatement_execute(WallFilter.java:627)
at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:3407)
at com.alibaba.druid.filter.FilterEventAdapter.preparedStatement_execute(FilterEventAdapter.java:440)
at com.alibaba.druid.filter.FilterChainImpl.preparedStatement_execute(FilterChainImpl.java:3407)
at com.alibaba.druid.proxy.jdbc.PreparedStatementProxyImpl.execute(PreparedStatementProxyImpl.java:167)
at com.alibaba.druid.pool.DruidPooledPreparedStatement.execute(DruidPooledPreparedStatement.java:497)
at org.apache.ibatis.executor.statement.PreparedStatementHandler.update(PreparedStatementHandler.java:47)
at org.apache.ibatis.executor.statement.RoutingStatementHandler.update(RoutingStatementHandler.java:74)
at org.apache.ibatis.executor.SimpleExecutor.doUpdate(SimpleExecutor.java:50)
at org.apache.ibatis.executor.BaseExecutor.update(BaseExecutor.java:117)
at org.apache.ibatis.executor.CachingExecutor.update(CachingExecutor.java:76)
at org.apache.ibatis.session.defaults.DefaultSqlSession.update(DefaultSqlSession.java:197)
… 24 common frames omitted

Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (mgmtpf_jeecgboot.ACT_RU_IDENTITYLINK, CONSTRAINT ACT_FK_TSKASS_TASK FOREIGN KEY (TASK_ID_) REFERENCES ACT_RU_TASK (ID_))

The error may exist in org/activiti/db/mapping/entity/Task.xml

The error may involve org.activiti.engine.impl.persistence.entity.TaskEntityImpl.deleteTask-Inline

The error occurred while setting parameters

SQL: delete from ACT_RU_TASK where ID_ = ? and REV_ = ?

Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (mgmtpf_jeecgboot.ACT_RU_IDENTITYLINK, CONSTRAINT ACT_FK_TSKASS_TASK FOREIGN KEY (TASK_ID_) REFERENCES ACT_RU_TASK (ID_))

Error updating database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (mgmtpf_jeecgboot.ACT_RU_IDENTITYLINK, CONSTRAINT ACT_FK_TSKASS_TASK FOREIGN KEY (TASK_ID_) REFERENCES ACT_RU_TASK (ID_))

The error may exist in org/activiti/db/mapping/entity/Task.xml

The error may involve org.activiti.engine.impl.persistence.entity.TaskEntityImpl.deleteTask-Inline

The error occurred while setting parameters

SQL: delete from ACT_RU_TASK where ID_ = ? and REV_ = ?

Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (mgmtpf_jeecgboot.ACT_RU_IDENTITYLINK, CONSTRAINT ACT_FK_TSKASS_TASK FOREIGN KEY (TASK_ID_) REFERENCES ACT_RU_TASK (ID_))

Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (`mgmtpf_jeecgboot`.`ACT_RU_IDENTITYLINK`, CONSTRAINT `ACT_FK_TSKASS_TASK` FOREIGN KEY (`TASK_ID_`) REFERENCES `ACT_RU_TASK` (`ID_`))

Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLIntegrityConstraintViolationException: Cannot delete or update a parent row: a foreign key constraint fails (`mgmtpf_jeecgboot`.`ACT_RU_IDENTITYLINK`, CONSTRAINT `ACT_FK_TSKASS_TASK` FOREIGN KEY (`TASK_ID_`) REFERENCES `ACT_RU_TASK` (`ID_`))