Unable to record in JMeter using AMF proxy server

Question

I have downloaded amf plugins as given in How to enable amf sampler type and started recording using AMF proxy server in Jmeter 4.0 but I am getting below error message in log and web page is not loading

 java.lang.NoClassDefFoundError: 
        org/apache/jmeter/protocol/http/sampler/HTTPSampler2
at java.lang.ClassLoader.defineClass1(Native Method) ~[?:1.8.0_141]
    at java.lang.ClassLoader.defineClass(ClassLoader.java:763) ~[?:1.8.0_141]
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[?:1.8.0_141]
    at java.net.URLClassLoader.defineClass(URLClassLoader.java:467) ~[?:1.8.0_141]
    at java.net.URLClassLoader.access$100(URLClassLoader.java:73) ~[?:1.8.0_141]
    at java.net.URLClassLoader$1.run(URLClassLoader.java:368) ~[?:1.8.0_141]
    at java.net.URLClassLoader$1.run(URLClassLoader.java:362) ~[?:1.8.0_141]
    at java.security.AccessController.doPrivileged(Native Method) ~[?:1.8.0_141]
    at java.net.URLClassLoader.findClass(URLClassLoader.java:361) ~[?:1.8.0_141]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_141]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_141]
    at java.lang.Class.getDeclaredConstructors0(Native Method) ~[?:1.8.0_141]
    at java.lang.Class.privateGetDeclaredConstructors(Class.java:2671) ~[?:1.8.0_141]
    at java.lang.Class.getConstructor0(Class.java:3075) ~[?:1.8.0_141]
    at java.lang.Class.newInstance(Class.java:412) ~[?:1.8.0_141]
    at org.apache.jmeter.protocol.amf.proxy.AmfDaemon.run(AmfDaemon.java:125) ~[JMeter-AMF.jar:?]
Caused by: java.lang.ClassNotFoundException: org.apache.jmeter.protocol.http.sampler.HTTPSampler2
    at java.net.URLClassLoader.findClass(URLClassLoader.java:381) ~[?:1.8.0_141]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[?:1.8.0_141]
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[?:1.8.0_141]
    ... 16 more

Answer 1

Looking into commit 2651c6ffc534e0137849377fce4b1b0e1aafca47 the file src/protocol/http/org/apache/jmeter/protocol/http/sampler/HTTPSampler2.java has been removed as a part of issue 60727 during JMeter 3.2 release

So the maximum version you can use AMF Proxy Server with is JMeter 3.1.

You can still download JMeter 3.1 from JMeter Archives page

Answer 2

As per Dmitri Answer the plugin you're trying to use only works with JMeter <= 3.1 due to drop of HTTPSampler2 within removal of commons-httpclient-3.x in JMeter. JMeter 3.1 which is now very old (3 versions away) and suffers from 2 CVEs in distributed testing.

Also see this:

• Issues in running Jmeter amfproxy

Your alternative is to use this commercial plugin for JMeter which works with latest version including 4.0, it works with BlazeDS only , not GraniteDS.

Disclaimer: we are providers of this plugin.