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https://issues.apache.org/jira/browse/NIFI-2034?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15333704#comment-15333704
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Oleg Zhurakousky commented on NIFI-2034:
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Would you be able to share what's in the classpath (POM, Gradle etc) of your
custom processor?
> NiFi is always loading a specific version of httpcore to classpath
> ------------------------------------------------------------------
>
> Key: NIFI-2034
> URL: https://issues.apache.org/jira/browse/NIFI-2034
> Project: Apache NiFi
> Issue Type: Bug
> Affects Versions: 0.5.1, 0.6.1
> Reporter: asanka sanjaya
>
> We have written a custom nifi processor to connect to microsoft exchange
> server and get emails. It runs perfectly as a standalone application. But
> nifi always loads httpcore-4.4.1.jar and httpclient-4.4.1.jar to classpath
> even though the nar file contains httpcore-4.4.4.jar and httpclient-4.5.2.jar.
> Because of that, it throws this error.
> 016-06-15 18:57:17,086 WARN [Timer-Driven Process Thread-4]
> o.a.n.c.t.ContinuallyRunProcessorTask Administratively Yielding
> NiFiJournalJob[id=52616329-d64c-4e14-bcb1-4c799891682a] due to uncaught
> Exception: java.lang.NoSuchFieldError: INSTANCE
> 2016-06-15 18:57:17,091 WARN [Timer-Driven Process Thread-4]
> o.a.n.c.t.ContinuallyRunProcessorTask
> java.lang.NoSuchFieldError: INSTANCE
> at
> org.apache.http.impl.io.DefaultHttpRequestWriterFactory.<init>(DefaultHttpRequestWriterFactory.java:52)
> ~[httpcore-4.4.1.jar:4.4.1]
> at
> org.apache.http.impl.io.DefaultHttpRequestWriterFactory.<init>(DefaultHttpRequestWriterFactory.java:56)
> ~[httpcore-4.4.1.jar:4.4.1]
> at
> org.apache.http.impl.io.DefaultHttpRequestWriterFactory.<clinit>(DefaultHttpRequestWriterFactory.java:46)
> ~[httpcore-4.4.1.jar:4.4.1]
> at
> org.apache.http.impl.conn.ManagedHttpClientConnectionFactory.<init>(ManagedHttpClientConnectionFactory.java:82)
> ~[httpclient-4.4.1.jar:4.4.1]
> at
> org.apache.http.impl.conn.ManagedHttpClientConnectionFactory.<init>(ManagedHttpClientConnectionFactory.java:95)
> ~[httpclient-4.4.1.jar:4.4.1]
> at
> org.apache.http.impl.conn.ManagedHttpClientConnectionFactory.<init>(ManagedHttpClientConnectionFactory.java:104)
> ~[httpclient-4.4.1.jar:4.4.1]
> at
> org.apache.http.impl.conn.ManagedHttpClientConnectionFactory.<clinit>(ManagedHttpClientConnectionFactory.java:62)
> ~[httpclient-4.4.1.jar:4.4.1]
> at
> org.apache.http.impl.conn.BasicHttpClientConnectionManager.<init>(BasicHttpClientConnectionManager.java:142)
> ~[httpclient-4.4.1.jar:4.4.1]
> at
> org.apache.http.impl.conn.BasicHttpClientConnectionManager.<init>(BasicHttpClientConnectionManager.java:128)
> ~[httpclient-4.4.1.jar:4.4.1]
> at
> org.apache.http.impl.conn.BasicHttpClientConnectionManager.<init>(BasicHttpClientConnectionManager.java:157)
> ~[httpclient-4.4.1.jar:4.4.1]
> at
> microsoft.exchange.webservices.data.core.ExchangeServiceBase.initializeHttpClient(ExchangeServiceBase.java:199)
> ~[na:na]
> at
> microsoft.exchange.webservices.data.core.ExchangeServiceBase.<init>(ExchangeServiceBase.java:174)
> ~[na:na]
> at
> microsoft.exchange.webservices.data.core.ExchangeServiceBase.<init>(ExchangeServiceBase.java:179)
> ~[na:na]
> at
> microsoft.exchange.webservices.data.core.ExchangeService.<init>(ExchangeService.java:3729)
> ~[na:na]
>
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