Thanks Oleg for debugging the issue. I will raise a JIRA and share the details in the mail thread.
-Nirmal From: Oleg Zhurakousky Sent: Tuesday, 1 November, 7:27 PM Subject: Re: Does NiFi ConsumeJMS Processor supports OpenJMS? To: [email protected] Nirmal Did some digging and the NPE is due to the fact that we are invoking a default constructor for whatever connection factory class is provided (i.e., ‘org.exolab.jms.client.JmsConnectionFactory’). And that works for most major JMS providers, however for OpenJMS after looking at the code it is rather clear that the default constructor that is exposed was not exposed to be actually used by the developers but rather internal serialization use. /** * Default constructor required for serialization */ public JmsConnectionFactory() { } Not sure why it was done this way . . ., but the NPE is due to the fact that the server proxy class is null so when it attempts to do Class.forName(proxyClassName) in getProxy() method it fails with NPE. One other thing I noticed is that all OpenJMS examples are based on obtaining ConnectionFactory from JNDI for which we currently do not have support. Once again, please raise the JIRA if you believe that it’s important to add such feature. Cheers Oleg On Nov 1, 2016, at 9:29 AM, Oleg Zhurakousky <[email protected]<mailto:[email protected]>> wrote: Nirmal While ConsumeJMS was developed and tested with the idea of supporting multiple providers, ‘openjms’ was not the one that it was tested with. I will look at the error and will follow up, but the fact that it already shows NPE means we have a bug somewhere, so please raise the JIRA (https://issues.apache.org/jira/browse/NIFI) if you don’t mind or let m know and I’ll do it. Thank you for reporting it. Cheers Oleg On Nov 1, 2016, at 8:35 AM, Nirmal Kumar <[email protected]<mailto:[email protected]>> wrote: Hi All, I am trying to read messages from openjms-0.7.7 using the ConsumeJMS Processor but getting following exception: 2016-11-01 14:43:17,260 ERROR [Timer-Driven Process Thread-4] o.apache.nifi.jms.processors.ConsumeJMS ConsumeJMS - JMSConsumer[destination:queue1; pub-sub:false;] ConsumeJMS - JMSConsumer[destination:queue1; pub-sub:false;] failed to process session due to org.springframework.jms.UncategorizedJmsException: Uncategorized exception occured during JMS processing; nested exception is javax.jms.JMSException: Failed to create proxy: java.lang.NullPointerException: org.springframework.jms.UncategorizedJmsException: Uncategorized exception occured during JMS processing; nested exception is javax.jms.JMSException: Failed to create proxy: java.lang.NullPointerException 2016-11-01 14:43:17,265 ERROR [Timer-Driven Process Thread-4] o.apache.nifi.jms.processors.ConsumeJMS org.springframework.jms.UncategorizedJmsException: Uncategorized exception occured during JMS processing; nested exception is javax.jms.JMSException: Failed to create proxy: java.lang.NullPointerException at org.springframework.jms.support.JmsUtils.convertJmsAccessException(JmsUtils.java:316) ~[na:na] at org.springframework.jms.support.JmsAccessor.convertJmsAccessException(JmsAccessor.java:169) ~[na:na] at org.springframework.jms.core.JmsTemplate.execute(JmsTemplate.java:497) ~[na:na] at org.springframework.jms.core.JmsTemplate.receiveSelected(JmsTemplate.java:764) ~[na:na] at org.springframework.jms.core.JmsTemplate.receive(JmsTemplate.java:738) ~[na:na] at org.springframework.jms.core.JmsTemplate.receive(JmsTemplate.java:727) ~[na:na] at org.apache.nifi.jms.processors.JMSConsumer.consume(JMSConsumer.java:65) ~[na:na] at org.apache.nifi.jms.processors.ConsumeJMS.rendezvousWithJms(ConsumeJMS.java:79) ~[na:na] at org.apache.nifi.jms.processors.AbstractJMSProcessor.onTrigger(AbstractJMSProcessor.java:136) ~[na:na] at org.apache.nifi.jms.processors.ConsumeJMS.onTrigger(ConsumeJMS.java:50) ~[na:na] at org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27) ~[nifi-api-1.0.0.jar:1.0.0] at org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1064) ~[nifi-framework-core-1.0.0.jar:1.0.0] at org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:136) [nifi-framework-core-1.0.0.jar:1.0.0] at org.apache.nifi.controller.tasks.ContinuallyRunProcessorTask.call(ContinuallyRunProcessorTask.java:47) [nifi-framework-core-1.0.0.jar:1.0.0] at org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:132) [nifi-framework-core-1.0.0.jar:1.0.0] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_45] at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308) [na:1.8.0_45] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_45] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294) [na:1.8.0_45] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) [na:1.8.0_45] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) [na:1.8.0_45] at java.lang.Thread.run(Thread.java:745) [na:1.8.0_45] Caused by: javax.jms.JMSException: Failed to create proxy: java.lang.NullPointerException at org.exolab.jms.client.JmsConnectionFactory.getProxy(JmsConnectionFactory.java:169) ~[na:na] at org.exolab.jms.client.JmsConnection.<init>(JmsConnection.java:174) ~[na:na] at org.exolab.jms.client.JmsConnectionFactory.createConnection(JmsConnectionFactory.java:284) ~[na:na] at org.exolab.jms.client.JmsConnectionFactory.createConnection(JmsConnectionFactory.java:266) ~[na:na] at org.springframework.jms.connection.UserCredentialsConnectionFactoryAdapter.doCreateConnection(UserCredentialsConnectionFactoryAdapter.java:181) ~[na:na] at org.springframework.jms.connection.UserCredentialsConnectionFactoryAdapter.createConnection(UserCredentialsConnectionFactoryAdapter.java:152) ~[na:na] at org.springframework.jms.connection.SingleConnectionFactory.doCreateConnection(SingleConnectionFactory.java:365) ~[na:na] at org.springframework.jms.connection.SingleConnectionFactory.initConnection(SingleConnectionFactory.java:305) ~[na:na] at org.springframework.jms.connection.SingleConnectionFactory.getConnection(SingleConnectionFactory.java:283) ~[na:na] at org.springframework.jms.connection.SingleConnectionFactory.createConnection(SingleConnectionFactory.java:224) ~[na:na] at org.springframework.jms.support.JmsAccessor.createConnection(JmsAccessor.java:180) ~[na:na] at org.springframework.jms.core.JmsTemplate.execute(JmsTemplate.java:484) ~[na:na] ... 19 common frames omitted I have configured the JMSConnectionFactoryProvider with the following properties: MQ ConnectionFactory Implementation org.exolab.jms.client.JmsConnectionFactory Actual MQ Client Libraries path (i.e., /usr/jms/lib) /user/nirmal/OpenJMS/openjms-0.7.7/lib The lib directory for OpenJMS I also tried org.exolab.jms.client.JmsXAConnectionFactory in the above #1 property but again the same exception logs. Not sure if somebody tested the ConsumeJMS / PublishJMS processors with OpenJMS? Thanks, -Nirmal NOTE: This message may contain information that is confidential, proprietary, privileged or otherwise protected by law. The message is intended solely for the named addressee. If received in error, please destroy and notify the sender. Any use of this email is prohibited when received in error. Impetus does not represent, warrant and/or guarantee, that the integrity of this communication has been maintained nor that the communication is free of errors, virus, interception or interference. ________________________________ NOTE: This message may contain information that is confidential, proprietary, privileged or otherwise protected by law. The message is intended solely for the named addressee. If received in error, please destroy and notify the sender. Any use of this email is prohibited when received in error. 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