https://developer.jboss.org/thread/271785

when jdbcItemReader calls resultSet.getRow(), and if the resultSet already reaches the end, db2 fails with

com.ibm.db2.jcc.am.SqlException: [jcc][t4][10120][10898][3.63.123] Invalid operation: result set is closed. ERRORCODE=-4470, SQLSTATE=null
at com.ibm.db2.jcc.am.fd.a(fd.java:663) ~[db2jcc.jar:?]
at com.ibm.db2.jcc.am.fd.a(fd.java:60) ~[db2jcc.jar:?]
at com.ibm.db2.jcc.am.fd.a(fd.java:103) ~[db2jcc.jar:?]
at com.ibm.db2.jcc.am.vn.Db(vn.java:4528) ~[db2jcc.jar:?]
at com.ibm.db2.jcc.am.vn.B(vn.java:2184) ~[db2jcc.jar:?]
at com.ibm.db2.jcc.am.vn.getRow(vn.java:2172) ~[db2jcc.jar:?]
at org.jberet.support.io.JdbcItemReader.readItem(JdbcItemReader.java:304) ~[jberet-support-1.3.0.Beta2.jar:1.3.0.Beta2]
at org.jberet.runtime.runner.ChunkRunner.readItem(ChunkRunner.java:359) ~[jberet-core-1.3.0.Beta2.jar:1.3.0.Beta2]
at org.jberet.runtime.runner.ChunkRunner.readProcessWriteItems(ChunkRunner.java:305) ~[jberet-core-1.3.0.Beta2.jar:1.3.0.Beta2]
at org.jberet.runtime.runner.ChunkRunner.run(ChunkRunner.java:201) [jberet-core-1.3.0.Beta2.jar:1.3.0.Beta2]
at org.jberet.runtime.runner.StepExecutionRunner.runBatchletOrChunk(StepExecutionRunner.java:226) [jberet-core-1.3.0.Beta2.jar:1.3.0.Beta2]
at org.jberet.runtime.runner.StepExecutionRunner.run(StepExecutionRunner.java:147) [jberet-core-1.3.0.Beta2.jar:1.3.0.Beta2]
at org.jberet.runtime.runner.CompositeExecutionRunner.runStep(CompositeExecutionRunner.java:164) [jberet-core-1.3.0.Beta2.jar:1.3.0.Beta2]
at org.jberet.runtime.runner.CompositeExecutionRunner.runJobElement(CompositeExecutionRunner.java:128) [jberet-core-1.3.0.Beta2.jar:1.3.0.Beta2]
at org.jberet.runtime.runner.StepExecutionRunner.run(StepExecutionRunner.java:203) [jberet-core-1.3.0.Beta2.jar:1.3.0.Beta2]
at org.jberet.runtime.runner.CompositeExecutionRunner.runStep(CompositeExecutionRunner.java:164) [jberet-core-1.3.0.Beta2.jar:1.3.0.Beta2]
at org.jberet.runtime.runner.CompositeExecutionRunner.runFromHeadOrRestartPoint(CompositeExecutionRunner.java:88) [jberet-core-1.3.0.Beta2.jar:1.3.0.Beta2]
at org.jberet.runtime.runner.JobExecutionRunner.run(JobExecutionRunner.java:60) [jberet-core-1.3.0.Beta2.jar:1.3.0.Beta2]
at org.jberet.spi.JobExecutor$1.run(JobExecutor.java:99) [jberet-core-1.3.0.Beta2.jar:1.3.0.Beta2]
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [?:1.8.0_73]
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [?:1.8.0_73]
at java.lang.Thread.run(Thread.java:745) [?:1.8.0_73]