问题
I am using Play framework(JAVA) to connect to MYSQL. While interacting with the database, I am getting an intermittent(20% times) the error with exception:
play.api.http.HttpErrorHandlerExceptions$$anon$1: Execution exception[[NullPointerException: null]] at play.api.http.HttpErrorHandlerExceptions$.throwableToUsefulException(HttpErrorHandler.scala:265) ~[play_2.10-2.4.2.jar:2.4.2] at play.api.http.DefaultHttpErrorHandler.onServerError(HttpErrorHandler.scala:191) ~[play_2.10-2.4.2.jar:2.4.2] at play.api.GlobalSettings$class.onError(GlobalSettings.scala:179) [play_2.10-2.4.2.jar:2.4.2] at play.api.DefaultGlobal$.onError(GlobalSettings.scala:212) [play_2.10-2.4.2.jar:2.4.2] at play.api.http.GlobalSettingsHttpErrorHandler.onServerError(HttpErrorHandler.scala:94) [play_2.10-2.4.2.jar:2.4.2] at play.filters.cors.AbstractCORSPolicy$$anonfun$1.applyOrElse(AbstractCORSPolicy.scala:151) [filters-helpers_2.10-2.4.2.jar:2.4.2] at play.filters.cors.AbstractCORSPolicy$$anonfun$1.applyOrElse(AbstractCORSPolicy.scala:150) [filters-helpers_2.10-2.4.2.jar:2.4.2] at scala.concurrent.Future$$anonfun$recoverWith$1.apply(Future.scala:344) [scala-library-2.10.5.jar:na] at scala.concurrent.Future$$anonfun$recoverWith$1.apply(Future.scala:343) [scala-library-2.10.5.jar:na] at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32) [scala-library-2.10.5.jar:na] at play.api.libs.iteratee.Execution$trampoline$.execute(Execution.scala:70) [play-iteratees_2.10-2.4.2.jar:2.4.2] at scala.concurrent.impl.CallbackRunnable.executeWithValue(Promise.scala:40) [scala-library-2.10.5.jar:na] at scala.concurrent.impl.Promise$DefaultPromise.tryComplete(Promise.scala:248) [scala-library-2.10.5.jar:na] at scala.concurrent.Promise$class.tryFailure(Promise.scala:112) [scala-library-2.10.5.jar:na] at scala.concurrent.impl.Promise$DefaultPromise.tryFailure(Promise.scala:153) [scala-library-2.10.5.jar:na] at play.api.mvc.Filter$$anon$1$$anonfun$apply$4$$anonfun$apply$1.applyOrElse(Filters.scala:67) [play_2.10-2.4.2.jar:2.4.2] at play.api.mvc.Filter$$anon$1$$anonfun$apply$4$$anonfun$apply$1.applyOrElse(Filters.scala:61) [play_2.10-2.4.2.jar:2.4.2] at scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:33) [scala-library-2.10.5.jar:na] at play.api.libs.iteratee.Iteratee$$anonfun$recoverM$1.applyOrElse(Iteratee.scala:629) [play-iteratees_2.10-2.4.2.jar:2.4.2] at play.api.libs.iteratee.Iteratee$$anonfun$recoverM$1.applyOrElse(Iteratee.scala:629) [play-iteratees_2.10-2.4.2.jar:2.4.2] at scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:33) [scala-library-2.10.5.jar:na] at scala.util.Failure$$anonfun$recover$1.apply(Try.scala:185) [scala-library-2.10.5.jar:na] at scala.util.Try$.apply(Try.scala:161) [scala-library-2.10.5.jar:na] at scala.util.Failure.recover(Try.scala:185) [scala-library-2.10.5.jar:na] at scala.concurrent.Future$$anonfun$recover$1.apply(Future.scala:324) [scala-library-2.10.5.jar:na] at scala.concurrent.Future$$anonfun$recover$1.apply(Future.scala:324) [scala-library-2.10.5.jar:na] at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32) [scala-library-2.10.5.jar:na] at akka.dispatch.BatchingExecutor$AbstractBatch.processBatch(BatchingExecutor.scala:55) [akka-actor_2.10-2.3.11.jar:na] at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply$mcV$sp(BatchingExecutor.scala:91) [akka-actor_2.10-2.3.11.jar:na] at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply(BatchingExecutor.scala:91) [akka-actor_2.10-2.3.11.jar:na] at akka.dispatch.BatchingExecutor$BlockableBatch$$anonfun$run$1.apply(BatchingExecutor.scala:91) [akka-actor_2.10-2.3.11.jar:na] at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:72) [scala-library-2.10.5.jar:na] at akka.dispatch.BatchingExecutor$BlockableBatch.run(BatchingExecutor.scala:90) [akka-actor_2.10-2.3.11.jar:na] at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:40) [akka-actor_2.10-2.3.11.jar:na] at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:397) [akka-actor_2.10-2.3.11.jar:na] at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260) [scala-library-2.10.5.jar:na] at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339) [scala-library-2.10.5.jar:na] at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979) [scala-library-2.10.5.jar:na] at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107) [scala-library-2.10.5.jar:na] Caused by: java.lang.NullPointerException: null at com.mysql.jdbc.ResultSetImpl.checkColumnBounds(ResultSetImpl.java:826) ~[mysql-connector-java-5.1.27.jar:na] at com.mysql.jdbc.ResultSetImpl.getInt(ResultSetImpl.java:2711) ~[mysql-connector-java-5.1.27.jar:na] at com.mysql.jdbc.ResultSetImpl.getInt(ResultSetImpl.java:2847) ~[mysql-connector-java-5.1.27.jar:na] at com.zaxxer.hikari.proxy.ResultSetJavassistProxy.getInt(ResultSetJavassistProxy.java) ~[HikariCP-2.3.7.jar:na] at org.hibernate.type.descriptor.sql.IntegerTypeDescriptor$2.doExtract(IntegerTypeDescriptor.java:61) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.type.descriptor.sql.BasicExtractor.extract(BasicExtractor.java:64) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:254) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:250) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.type.AbstractStandardBasicType.nullSafeGet(AbstractStandardBasicType.java:230) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.type.AbstractStandardBasicType.hydrate(AbstractStandardBasicType.java:331) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.loader.Loader.extractKeysFromResultSet(Loader.java:668) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.loader.Loader.getRowFromResultSet(Loader.java:606) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.loader.Loader.doQuery(Loader.java:829) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:274) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.loader.Loader.doList(Loader.java:2542) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2276) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.loader.Loader.list(Loader.java:2271) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:459) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.hql.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:365) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.engine.query.HQLQueryPlan.performList(HQLQueryPlan.java:196) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.impl.SessionImpl.list(SessionImpl.java:1268) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.impl.QueryImpl.list(QueryImpl.java:102) ~[hibernate-core-3.6.9.Final.jar:3.6.9.Final] at org.hibernate.ejb.QueryImpl.getResultList(QueryImpl.java:246) ~[hibernate-entitymanager-3.6.9.Final.jar:3.6.9.Final] at service.UserService.getSessionById(UserService.java:40) ~[classes/:na] at interceptors.SecuredAction.call(SecuredAction.java:26) ~[classes/:na]
The initial cause of this comes from Null pointer exception at
com.mysql.jdbc.ResultSetImpl.checkColumnBounds(ResultSetImpl.java:826)
The method in jar is as follows:
/**
802 * Checks if columnIndex is within the number of columns in this result set.
803 *
804 * @param columnIndex
805 * the index to check
806 *
807 * @throws SQLException
808 * if the index is out of bounds
809 */
810 protected final void checkColumnBounds(int columnIndex) throws SQLException {
811 if ((columnIndex < 1)) {
812 throw SQLError.createSQLException(Messages.getString(
813 "ResultSet.Column_Index_out_of_range_low", new Object[] {
814 Constants.integerValueOf(columnIndex),
815 Constants.integerValueOf(this.fields.length) }),
816 SQLError.SQL_STATE_ILLEGAL_ARGUMENT, getExceptionInterceptor()); //$NON-NLS-1$
817 } else if ((columnIndex > this.fields.length)) {
818 throw SQLError.createSQLException(Messages.getString(
819 "ResultSet.Column_Index_out_of_range_high", new Object[] {
820 Constants.integerValueOf(columnIndex),
821 Constants.integerValueOf(this.fields.length) }),
822 SQLError.SQL_STATE_ILLEGAL_ARGUMENT, getExceptionInterceptor()); //$NON-NLS-1$
823 }
824
825 if (this.profileSql || this.useUsageAdvisor) {
826 this.columnUsed[columnIndex - 1] = true;
827 }
828 }
I am not able to figure out what is the cause for the failure since the setup is working perfectly on 80% of the calls.
This error occurs after the
javax.persistence.PersistenceException: org.hibernate.exception.GenericJDBCException: Cannot open connection
which I am trying to figure out separately and if they are related or not, but if the connection is not there and "this" is null, should the code not break much before line 826?
Can anyone please help with identifying the error? Thanks in advance.
来源：https://stackoverflow.com/questions/32834387/intermittent-java-mysql-connection-exception-play-java