一段腳本任務如下：

 ret=`/data/dolphinscheduler/loadOraTable.sh "yonbip/yonbip@10.16.10.69:1521/orcl" "select t.bondcontractno,t.olcunissuemny from yonbip.bond_contract t " "/dmp/biz" "bip" "2025-08-13"`
echo "$ret"
findCols=`echo $ret |grep "new line cols:"`
echo "findCols: findCols"
colsNum=$(echo $findCols | awk -F 'new line cols:{' '{print $2}' | awk -F '}' '{print $1}')echo "#{setValue(newLineColNums=${colsNum})}"
echo "newLineColNums: $colsNum"

運行時出現如下錯誤：

[INFO] 2025-08-14 05:52:33.633 +0000 - raw script : ret=`/data/dolphinscheduler/loadOraTable.sh "yonbip/yonbip@10.16.10.69:1521/orcl" "select t.bondcontractno,t.olcunissuemny from yonbip.bond_contract t " "/dmp/biz" "bip" "2025-08-13"`
echo "$ret"
findCols=`echo $ret |grep "new line cols:"`
if [ -n $findCols ]
thenecho "findCols: findCols"colsNum=$(echo $findCols | awk -F 'new line cols:{' '{print $2}' | awk -F '}' '{print $1}')
fi
echo "#{setValue(newLineColNums=${colsNum})}"
echo "newLineColNums: $colsNum"
[INFO] 2025-08-14 05:52:33.633 +0000 - task execute path : /tmp/dolphinscheduler/exec/process/hive/18584734972800/18632548623621_8/632/2403
[INFO] 2025-08-14 05:52:33.633 +0000 - Begin to create command file:/tmp/dolphinscheduler/exec/process/hive/18584734972800/18632548623621_8/632/2403/632_2403.command
[INFO] 2025-08-14 05:52:33.633 +0000 - Success create command file, command: #!/bin/bash
BASEDIR=$(cd `dirname $0`; pwd)
cd $BASEDIR
source /opt/datasophon/dolphinscheduler-3.1.8/worker-server/conf/dolphinscheduler_env.sh
/tmp/dolphinscheduler/exec/process/hive/18584734972800/18632548623621_8/632/2403/632_2403_node.sh
[INFO] 2025-08-14 05:52:33.634 +0000 - task run command: sudo -u hive -E bash /tmp/dolphinscheduler/exec/process/hive/18584734972800/18632548623621_8/632/2403/632_2403.command
[INFO] 2025-08-14 05:52:33.635 +0000 - process start, process id is: 74084
[INFO] 2025-08-14 05:52:39.030 +0000 - process has exited. execute path:/tmp/dolphinscheduler/exec/process/hive/18584734972800/18632548623621_8/632/2403, processId:74084 ,exitStatusCode:0 ,processWaitForStatus:true ,processExitValue:0
[ERROR] 2025-08-14 05:52:39.031 +0000 - shell task error
java.lang.ArrayIndexOutOfBoundsException: 1at org.apache.dolphinscheduler.plugin.task.api.parameters.AbstractParameters.getMapByString(AbstractParameters.java:191)at org.apache.dolphinscheduler.plugin.task.api.parameters.AbstractParameters.dealOutParam(AbstractParameters.java:144)at org.apache.dolphinscheduler.plugin.task.shell.ShellTask.handle(ShellTask.java:99)at org.apache.dolphinscheduler.server.worker.runner.DefaultWorkerDelayTaskExecuteRunnable.executeTask(DefaultWorkerDelayTaskExecuteRunnable.java:49)at org.apache.dolphinscheduler.server.worker.runner.WorkerTaskExecuteRunnable.run(WorkerTaskExecuteRunnable.java:174)at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)at com.google.common.util.concurrent.TrustedListenableFutureTask$TrustedFutureInterruptibleTask.runInterruptibly(TrustedListenableFutureTask.java:131)at com.google.common.util.concurrent.InterruptibleTask.run(InterruptibleTask.java:74)at com.google.common.util.concurrent.TrustedListenableFutureTask.run(TrustedListenableFutureTask.java:82)at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)at java.lang.Thread.run(Thread.java:750)
[ERROR] 2025-08-14 05:52:39.031 +0000 - Task execute failed, due to meet an exception
org.apache.dolphinscheduler.plugin.task.api.TaskException: Execute shell task errorat org.apache.dolphinscheduler.plugin.task.shell.ShellTask.handle(ShellTask.java:108)at org.apache.dolphinscheduler.server.worker.runner.DefaultWorkerDelayTaskExecuteRunnable.executeTask(DefaultWorkerDelayTaskExecuteRunnable.java:49)at org.apache.dolphinscheduler.server.worker.runner.WorkerTaskExecuteRunnable.run(WorkerTaskExecuteRunnable.java:174)at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)at com.google.common.util.concurrent.TrustedListenableFutureTask$TrustedFutureInterruptibleTask.runInterruptibly(TrustedListenableFutureTask.java:131)at com.google.common.util.concurrent.InterruptibleTask.run(InterruptibleTask.java:74)at com.google.common.util.concurrent.TrustedListenableFutureTask.run(TrustedListenableFutureTask.java:82)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:750)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 1at org.apache.dolphinscheduler.plugin.task.api.parameters.AbstractParameters.getMapByString(AbstractParameters.java:191)at org.apache.dolphinscheduler.plugin.task.api.parameters.AbstractParameters.dealOutParam(AbstractParameters.java:144)at org.apache.dolphinscheduler.plugin.task.shell.ShellTask.handle(ShellTask.java:99)... 9 common frames omitted

腳本本身運行沒出現任何錯誤，但dolphinscheduler提示錯誤。后來多次研究發現，如果設置變量值為空時會出現這個異常，就是下面這行用于向dolphinscheduler輸出變量的腳本：

echo "#{setValue(newLineColNums=${colsNum})}"

如果colsNum為空，就會出現錯誤。
于是，加一個判斷就能解決問題了：

ret=`/data/dolphinscheduler/loadOraTable.sh "${dbConnect}" "select ${slctColums} from ${SRC_DB}.${tableName} t " "/dmp/${DMP_DB}" "${srcSystem}" "${bizDate}"`
colsNum=$(echo $ret |grep "new line cols:" | awk -F 'new line cols:{' '{print $2}' | awk -F '}' '{print $1}')
if (( -n $colsNum ))
thenecho "#{setValue(newLineColNums=${colsNum})}"
fi
echo "newLineColNums: $colsNum"