# Watcher condition script throws an null pointer exception
**URL:** https://discuss.elastic.co/t/watcher-condition-script-throws-an-null-pointer-exception/156092
**Category:** Elasticsearch
**Tags:** elastic-stack-alerting
**Created:** [November 9, 2018, 5:37pm UTC](https://discuss.elastic.co/t/watcher-condition-script-throws-an-null-pointer-exception/156092 "2018-11-09T17:37:34Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@shiv94](https://discuss.elastic.co/u/shiv94)
#### Post date: [November 9, 2018, 5:37pm UTC](https://discuss.elastic.co/t/watcher-condition-script-throws-an-null-pointer-exception/156092/1 "2018-11-09T17:37:34Z")
I am trying to access the ctx fields in the condition script
"result": {
"execution\_time": "2018-11-09T16:42:43.944Z",
"execution\_duration": 84,
"input": {
"type": "search",
"status": "success",
"payload": {
"\_shards": {
"total": 90,
"failed": 0,
"successful": 90,
"skipped": 0
},
"hits": {
"hits": ,
"total": 2968,
"max\_score": 0
},
"took": 58,
"timed\_out": false,
"aggregations": {
"messages": {
"meta": {},
"buckets": {
"errors": {
"doc\_count": 1033,
"host": {
"doc\_count\_error\_upper\_bound": 0,
"sum\_other\_doc\_count": 0,
"meta": {},
"buckets": [
{
"doc\_count": 887,
"time": {
"doc\_count": 887,
"meta": {},
"tophit": {
"hits": {
"hits": [
{
"\_index": "filebeat-6.4.1-2018.11.08",
"\_type": "doc",
"\_source": {
"offset": 328587,
"prospector": {
"type": "log"
},
"source": "/var/log/elasticsearch/server1/xxx.log",
"fileset": {
"module": "elasticsearch",
"name": "server"
},
"message": "[2018-11-08T09:03:42,745][DEBUG][o.e.a.a.i.s.TransportIndicesStatsAction] ...",
"type": "beats",
"tags": [
"beats\_input\_codec\_plain\_applied"
],
"input": {
"type": "log"
},
"@timestamp": "2018-11-08T15:22:03.172Z",
"service": {
"name": "elasticsearch"
},
"@version": "1",
"beat": {
"hostname": "server1",
"name": "server1",
"version": "6.4.1"
},
"host": {
"name": "server1"
}
},
"\_id": "xxx",
"\_score": 5.5517254
}
],
"total": 887,
"max\_score": 5.5517254
}
}
},
"key": "server1"
},
Condition script:
{
"script": {
"lang": "painless",
"source": "return ctx.payload.aggregations.messages.buckets.errors.host.buckets.stream().anyMatch(b -\> b.tophit.hits.total \> params.total)",
"params": {"total": 1}
}
But it throws as error as follows
"exception": {
"type": "script\_exception",
"reason": "runtime error",
"script\_stack": [
"b -\> b.tophit.hits.total \> params.total)",
" ^---- HERE"
],
"script": "condition",
"lang": "painless",
"caused\_by": {
"type": "null\_pointer\_exception",
"reason": null,
"stack\_trace": "java.lang.NullPointerException\n\tat org.elasticsearch.painless.DefBootstrap$PIC.fallback(DefBootstrap.java:203)\n\tat org.elasticsearch.painless.PainlessScript$Script.lambda$0(condition:101)\n\tat org.elasticsearch.painless.PainlessScript$Script$$Lambda0.test(Unknown Source)\n\tat java.util.stream.MatchOps$1MatchSink.accept(MatchOps.java:90)\n\tat java.util.ArrayList$ArrayListSpliterator.tryAdvance(ArrayList.java:1359)\n\tat java.util.stream.ReferencePipeline.forEachWithCancel(ReferencePipeline.java:126)\n\tat java.util.stream.AbstractPipeline.copyIntoWithCancel(AbstractPipeline.java:498)\n\tat java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:485)\n\tat java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)\n\tat java.util.stream.MatchOps$MatchOp.evaluateSequential(MatchOps.java:230)\n\tat java.util.stream.MatchOps$MatchOp.evaluateSequential(MatchOps.java:196)\n\tat java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)\n\tat java.util.stream.ReferencePipeline.anyMatch(ReferencePipeline.java:449)\n\tat java.lang.invoke.MethodHandle.invokeWithArguments(MethodHandle.java:627)\n\tat org.elasticsearch.painless.DefBootstrap$PIC.fallback(DefBootstrap.java:212)\n\tat org.elasticsearch.painless.PainlessScript$Script.execute(condition:88)\n\tat org.elasticsearch.painless.ScriptImpl.run(ScriptImpl.java:105)\n\tat org.elasticsearch.xpack.watcher.condition.ScriptCondition.doExecute(ScriptCondition.java:73)\n\tat org.elasticsearch.xpack.watcher.condition.ScriptCondition.execute(ScriptCondition.java:64)\n\tat org.elasticsearch.xpack.watcher.execution.ExecutionService.executeInner(ExecutionService.java:443)\n\tat org.elasticsearch.xpack.watcher.execution.ExecutionService.execute(ExecutionService.java:295)\n\tat org.elasticsearch.xpack.watcher.transport.actions.execute.TransportExecuteWatchAction$1.doRun(TransportExecuteWatchAction.java:154)\n\tat org.elasticsearch.common.util.concurrent.AbstractRunnable.run(AbstractRunnable.java:37)\n\tat java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)\n\tat java.util.concurrent.FutureTask.run(FutureTask.java:266)\n\tat org.elasticsearch.common.util.concurrent.ThreadContext$ContextPreservingRunnable.run(ThreadContext.java:624)\n\tat java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)\n\tat java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)\n\tat java.lang.Thread.run(Thread.java:748)\n"
},
Can anyone help me with the condition script format
---
### Author:  [@shiv94](https://discuss.elastic.co/u/shiv94)
#### Post date: [November 9, 2018, 6:35pm UTC](https://discuss.elastic.co/t/watcher-condition-script-throws-an-null-pointer-exception/156092/2 "2018-11-09T18:35:05Z")
This is resolved
Thanks!
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [December 7, 2018, 6:49pm UTC](https://discuss.elastic.co/t/watcher-condition-script-throws-an-null-pointer-exception/156092/3 "2018-12-07T18:49:14Z")
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