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java.sql.BatchUpdateException: Cannot delete or update a parent row: a foreign key constraint fails (`geppetto`.`geppettoproject_experiments`, CONSTRAINT `GEPPETTOPROJECT_EXPERIMENTS_FK2` FOREIGN KEY (`ID_EID`) REFERENCES `experiment` (`ID`))	at com.mysql.jdbc.PreparedStatement.executeBatchSerially(PreparedStatement.java:1666)	at com.mysql.jdbc.PreparedStatement.executeBatch(PreparedStatement.java:1082)	at org.datanucleus.store.rdbms.datasource.dbcp.DelegatingStatement.executeBatch(DelegatingStatement.java:279)	at org.datanucleus.store.rdbms.datasource.dbcp.DelegatingStatement.executeBatch(DelegatingStatement.java:279)	at org.datanucleus.store.rdbms.ParamLoggingPreparedStatement.executeBatch(ParamLoggingPreparedStatement.java:366)	at org.datanucleus.store.rdbms.SQLController.processConnectionStatement(SQLController.java:676)	at org.datanucleus.store.rdbms.SQLController.processStatementsForConnection(SQLController.java:644)	at org.datanucleus.store.rdbms.SQLController$1.transactionFlushed(SQLController.java:731)	at org.datanucleus.store.connection.AbstractManagedConnection.transactionFlushed(AbstractManagedConnection.java:89)	at org.datanucleus.store.connection.ConnectionManagerImpl$2.transactionFlushed(ConnectionManagerImpl.java:450)	at org.datanucleus.TransactionImpl.flush(TransactionImpl.java:212)	at org.datanucleus.TransactionImpl.commit(TransactionImpl.java:276)	at org.datanucleus.api.jdo.JDOTransaction.commit(JDOTransaction.java:107)	at org.geppetto.persistence.db.DBManager.deleteEntity(DBManager.java:197)	at org.geppetto.persistence.GeppettoDataManager.deleteExperiment(GeppettoDataManager.java:332)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:606)	at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:319)	at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:183)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:150)	at org.springframework.aop.support.DelegatingIntroductionInterceptor.doProceed(DelegatingIntroductionInterceptor.java:131)	at org.springframework.aop.support.DelegatingIntroductionInterceptor.invoke(DelegatingIntroductionInterceptor.java:119)	at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:172)	at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:202)	at com.sun.proxy.$Proxy111.deleteExperiment(Unknown Source)	at org.geppetto.simulation.manager.GeppettoManager.deleteExperiment(GeppettoManager.java:425)	at org.geppetto.frontend.controllers.ConnectionHandler.deleteExperiment(ConnectionHandler.java:797)	at org.geppetto.frontend.controllers.WebsocketConnection.onTextMessage(WebsocketConnection.java:298)	at org.apache.catalina.websocket.MessageInbound.onTextData(MessageInbound.java:74)	at org.apache.catalina.websocket.StreamInbound.doOnTextData(StreamInbound.java:186)	at org.apache.catalina.websocket.StreamInbound.onData(StreamInbound.java:134)	at org.apache.coyote.http11.upgrade.UpgradeProcessor.upgradeDispatch(UpgradeProcessor.java:83)	at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:587)	at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)	at java.lang.Thread.run(Thread.java:745)