How to add external jar to nifi cluster? - apache-nifi

Question

I am trying to add an external JAR to my nifi cluster.
I am following the codes of this post: Nifi multipart form
The script body is exactly the same as the one in the post except that it is without Grab phrase.
I have downloaded the jars: httpcore-4.3.2 and httpmime-4.5.9.jar from maven repo and I have put them into local file system of the cluster.
Then I gave the location of these jars to the additional classpath of ExecuteGroovyScript.
However i have an error of "unable to resolve class ContentType".
It seems it never found the jar.
Someone helps please.
FYI: I am working on a cluster which I cannot add the external jars directly to /lib so i cannot use grab.
and here is the error from nifi-app.log of my local nifi:
2021-05-17 17:38:44,825 ERROR [Timer-Driven Process Thread-10] o.a.n.p.groovyx.ExecuteGroovyScript ExecuteGroovyScript[id=7a78065f-0179-1000-2e4b-daefbdcf006a] java.lang.NoClassDefFoundError: org/apache/http/HttpEntity: java.lang.NoClassDefFoundError: org/apache/http/HttpEntity
java.lang.NoClassDefFoundError: org/apache/http/HttpEntity
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at org.codehaus.groovy.runtime.callsite.CallSiteArray$1.run(CallSiteArray.java:68)
at org.codehaus.groovy.runtime.callsite.CallSiteArray$1.run(CallSiteArray.java:65)
at java.security.AccessController.doPrivileged(Native Method)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.createCallStaticSite(CallSiteArray.java:65)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.createCallSite(CallSiteArray.java:162)
at org.codehaus.groovy.runtime.callsite.CallSiteArray.defaultCall(CallSiteArray.java:48)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:113)
at org.codehaus.groovy.runtime.callsite.AbstractCallSite.call(AbstractCallSite.java:117)
at Scriptffffffffea61d3da$_run_closure1.doCall(Scriptffffffffea61d3da.groovy:10)
at sun.reflect.GeneratedMethodAccessor327.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.codehaus.groovy.reflection.CachedMethod.invoke(CachedMethod.java:93)
at groovy.lang.MetaMethod.doMethodInvoke(MetaMethod.java:325)
at org.codehaus.groovy.runtime.metaclass.ClosureMetaClass.invokeMethod(ClosureMetaClass.java:294)
at groovy.lang.MetaClassImpl.invokeMethod(MetaClassImpl.java:1022)
at groovy.lang.Closure.call(Closure.java:414)
at org.apache.nifi.processors.groovyx.flow.GroovySessionFile$5.process(GroovySessionFile.java:176)
at org.apache.nifi.controller.repository.StandardProcessSession.write(StandardProcessSession.java:2923)
at org.apache.nifi.processors.groovyx.flow.ProcessSessionWrap.write(ProcessSessionWrap.java:823)
at org.apache.nifi.processors.groovyx.flow.SessionFile.write(SessionFile.java:93)
at org.apache.nifi.processors.groovyx.flow.GroovySessionFile.write(GroovySessionFile.java:174)
at org.apache.nifi.processors.groovyx.flow.GroovySessionFile$write.call(Unknown Source)
at Scriptffffffffea61d3da.run(Scriptffffffffea61d3da.groovy:9)
at org.apache.nifi.processors.groovyx.ExecuteGroovyScript.onTrigger(ExecuteGroovyScript.java:449)
at org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
at org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1162)
at org.apache.nifi.controller.tasks.ConnectableTask.invoke(ConnectableTask.java:205)
at org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:117)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.ClassNotFoundException: org.apache.http.HttpEntity
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
... 38 common frames omitted

Answer 1

as i can see you have to include more libraries to use httpmime-4.5.9
org.apache.httpcomponents/httpmime/jars/httpmime-4.5.9.jar
org.apache.httpcomponents/httpclient/jars/httpclient-4.5.9.jar
org.apache.httpcomponents/httpcore/jars/httpcore-4.4.11.jar
commons-logging/commons-logging/jars/commons-logging-1.2.jar
commons-codec/commons-codec/jars/commons-codec-1.11.jar
you can run the following code in groovy console to determine all libraries required for one dependency:
#Grab(group='org.apache.httpcomponents', module='httpmime', version='4.5.9')
import groovy.grape.Grape
def grape = Grape.getInstance()
def r = grape.listDependencies(this.getClass().getClassLoader())
println grape.resolve(r[0]).join('\n')