org.springframework.jdbc.UncategorizedSQLException: Error attempting to get column 'alarmGroup' from result set. Cause: java.sql.SQLException: Error

异常展示：

org.springframework.jdbc.UncategorizedSQLException: Error attempting to get column 'alarmGroup' from result set.  Cause: java.sql.SQLException: Error
; uncategorized SQLException for SQL []; SQL state [null]; error code [0]; Error; nested exception is java.sql.SQLException: Error
        at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:90)
        at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:82)
        at org.springframework.jdbc.support.AbstractFallbackSQLExceptionTranslator.translate(AbstractFallbackSQLExceptionTranslator.java:82)
        at org.mybatis.spring.MyBatisExceptionTranslator.translateExceptionIfPossible(MyBatisExceptionTranslator.java:73)
        at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:446)
        at com.sun.proxy.$Proxy97.selectList(Unknown Source)
        at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:230)
        at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:137)
        at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:75)
        at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:59)
        at com.sun.proxy.$Proxy116.queryIvsCameraOnOffDetail(Unknown Source)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:333)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:190)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:157)
        at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:136)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:179)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:213)
        at com.sun.proxy.$Proxy117.queryIvsCameraOnOffDetail(Unknown Source)
        at com.allcam.rss.system.task.IvsOnOffDetailStatisticsTimerJob.doIvsOnOffDetailStatistics(IvsOnOffDetailStatisticsTimerJob.java:55)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.springframework.scheduling.support.ScheduledMethodRunnable.run(ScheduledMethodRunnable.java:65)
        at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
        at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:81)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ScheduledThreadPoolExecutor$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: java.sql.SQLException: Error
        at com.alibaba.druid.pool.DruidDataSource.handleConnectionException(DruidDataSource.java:1543)
        at com.alibaba.druid.pool.DruidPooledConnection.handleException(DruidPooledConnection.java:133)
        at com.alibaba.druid.pool.DruidPooledStatement.checkException(DruidPooledStatement.java:77)
        at com.alibaba.druid.pool.DruidPooledResultSet.checkException(DruidPooledResultSet.java:55)
        at com.alibaba.druid.pool.DruidPooledResultSet.getString(DruidPooledResultSet.java:259)
        at org.apache.ibatis.type.StringTypeHandler.getNullableResult(StringTypeHandler.java:37)
        at org.apache.ibatis.type.StringTypeHandler.getNullableResult(StringTypeHandler.java:26)
        at org.apache.ibatis.type.BaseTypeHandler.getResult(BaseTypeHandler.java:66)
        at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.applyAutomaticMappings(DefaultResultSetHandler.java:516)
        at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getRowValue(DefaultResultSetHandler.java:397)
        at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValuesForSimpleResultMap(DefaultResultSetHandler.java:351)
        at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValues(DefaultResultSetHandler.java:326)
        at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSet(DefaultResultSetHandler.java:299)
        at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets(DefaultResultSetHandler.java:192)
        at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:64)
        at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79)
        at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:63)
        at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324)
        at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
        at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)
        at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:83)
        at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)
        at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)
        at sun.reflect.GeneratedMethodAccessor307.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)
        ... 32 common frames omitted
Caused by: java.lang.OutOfMemoryError: GC overhead limit exceeded
        at java.nio.CharBuffer.allocate(CharBuffer.java:335)
        at java.nio.charset.CharsetDecoder.decode(CharsetDecoder.java:795)
        at java.nio.charset.Charset.decode(Charset.java:807)
        at com.mysql.jdbc.StringUtils.toString(StringUtils.java:2253)
        at com.mysql.jdbc.ResultSetRow.getString(ResultSetRow.java:701)
        at com.mysql.jdbc.ByteArrayRow.getString(ByteArrayRow.java:69)
        at com.mysql.jdbc.ResultSetImpl.getStringInternal(ResultSetImpl.java:5252)
        at com.mysql.jdbc.ResultSetImpl.getString(ResultSetImpl.java:5135)
        at com.mysql.jdbc.ResultSetImpl.getString(ResultSetImpl.java:5174)
        at com.alibaba.druid.pool.DruidPooledResultSet.getString(DruidPooledResultSet.java:257)
        at org.apache.ibatis.type.StringTypeHandler.getNullableResult(StringTypeHandler.java:37)
        at org.apache.ibatis.type.StringTypeHandler.getNullableResult(StringTypeHandler.java:26)
        at org.apache.ibatis.type.BaseTypeHandler.getResult(BaseTypeHandler.java:66)
        at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.applyAutomaticMappings(DefaultResultSetHandler.java:516)
        at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.getRowValue(DefaultResultSetHandler.java:397)
        at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValuesForSimpleResultMap(DefaultResultSetHandler.java:351)
        at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleRowValues(DefaultResultSetHandler.java:326)
        at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSet(DefaultResultSetHandler.java:299)
        at org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets(DefaultResultSetHandler.java:192)
        at org.apache.ibatis.executor.statement.PreparedStatementHandler.query(PreparedStatementHandler.java:64)
        at org.apache.ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.java:79)
        at org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:63)
        at org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:324)
        at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
        at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)
        at org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:83)
        at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:148)
        at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)
        at sun.reflect.GeneratedMethodAccessor307.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:498)
        at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:433)

由于这一串异常是源于同一个原因，刚发现该错误的时候，定位的顺序是从上往下定位的，发现没有什么问题，逻辑和代码都是ok的。

当从下往上定位异常时，发现了错误的原因，由于查询的数据量较大，导致程序报内存溢出，最终导致元素赋值时不允许。

解决办法：优化查询数量的大小方法。顺利解决