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https://issues.apache.org/jira/browse/CAMEL-22491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18024644#comment-18024644
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Claus Ibsen commented on CAMEL-22491:
-------------------------------------
It may be better to have
* scheduled consumer that makes Camel automatic re-connect
* scraper with trigger consumer that uses plc4j
Remove complex logic from endpoint with all the connect/reconnect
> camel-plc4j - NPE exception when cannot connect to remote service
> -----------------------------------------------------------------
>
> Key: CAMEL-22491
> URL: https://issues.apache.org/jira/browse/CAMEL-22491
> Project: Camel
> Issue Type: Bug
> Reporter: Claus Ibsen
> Priority: Minor
> Fix For: 4.16.0
>
>
> If the remote service is offline then you have an ugly NPE exception
> {code:java}
> Caused by: java.lang.NullPointerException: Cannot invoke
> "org.apache.plc4x.java.api.PlcConnection.readRequestBuilder()" because
> "this.connection" is null at
> org.apache.camel.component.plc4x.Plc4XEndpoint.buildPlcReadRequest(Plc4XEndpoint.java:204)
> ~[?:?] at
> org.apache.camel.component.plc4x.Plc4XConsumer.startUnTriggered(Plc4XConsumer.java:103)
> ~[?:?] at
> org.apache.camel.component.plc4x.Plc4XConsumer.doStart(Plc4XConsumer.java:85)
> ~[?:?] at
> org.apache.camel.support.service.BaseService.start(BaseService.java:123)
> ~[camel-api-4.15.0-SNAPSHOT.jar:4.15.0-SNAPSHOT] at
> org.apache.camel.support.service.ServiceHelper.startService(ServiceHelper.java:127)
> ~[camel-api-4.15.0-SNAPSHOT.jar:4.15.0-SNAPSHOT] at
> org.apache.camel.support.EventDrivenPollingConsumer.doStart(EventDrivenPollingConsumer.java:289)
> ~[camel-support-4.15.0-SNAPSHOT.jar:4.15.0-SNAPSHOT] at
> org.apache.camel.component.plc4x.Plc4XPollingConsumer.doStart(Plc4XPollingConsumer.java:57)
> ~[?:?] at
> org.apache.camel.support.service.BaseService.start(BaseService.java:123)
> ~[camel-api-4.15.0-SNAPSHOT.jar:4.15.0-SNAPSHOT] at
> org.apache.camel.support.service.ServiceHelper.startService(ServiceHelper.java:127)
> ~[camel-api-4.15.0-SNAPSHOT.jar:4.15.0-SNAPSHOT] at
> org.apache.camel.impl.engine.InternalServiceManager.doAddService(InternalServiceManager.java:144)
> ~[camel-base-engine-4.15.0-SNAPSHOT.jar:4.15.0-SNAPSHOT] at
> org.apache.camel.impl.engine.AbstractCamelContext.addService(AbstractCamelContext.java:1545)
> ~[camel-base-engine-4.15.0-SNAPSHOT.jar:4.15.0-SNAPSHOT] at
> org.apache.camel.support.cache.ServicePool$SinglePool.acquire(ServicePool.java:215)
> ~[camel-support-4.15.0-SNAPSHOT.jar:4.15.0-SNAPSHOT] at
> org.apache.camel.support.cache.ServicePool$SinglePool.acquire(ServicePool.java:197)
> ~[camel-support-4.15.0-SNAPSHOT.jar:4.15.0-SNAPSHOT] at
> org.apache.camel.support.cache.ServicePool.acquire(ServicePool.java:116)
> ~[camel-support-4.15.0-SNAPSHOT.jar:4.15.0-SNAPSHOT] at
> org.apache.camel.support.cache.PollingConsumerServicePool.acquire(PollingConsumerServicePool.java:28)
> ~[camel-support-4.15.0-SNAPSHOT.jar:4.15.0-SNAPSHOT] at
> org.apache.camel.support.cache.DefaultConsumerCache.acquirePollingConsumer(DefaultConsumerCache.java:102)
> ~[camel-support-4.15.0-SNAPSHOT.jar:4.15.0-SNAPSHOT] {code}
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