HTTP Post with Matlab

Question

I followed the example given in this post: How to send data from Matlab to Rails, but am receiving an error message that I cannot find any information on. My script looks like this:

javaaddpath('./httpcomponents/httpclient-4.2.2.jar') javaaddpath('./httpcomponents/httpcore-4.2.2.jar') import org.apache.http.impl.client.DefaultHttpClient; import org.apache.http.client.methods.HttpPost; import org.apache.http.entity.StringEntity; httpclient = DefaultHttpClient(); httppost = HttpPost('http://localhost:3000/signin'); httppost.addHeader('Content-Type','application/json'); httppost.addHeader('Accept','application/json'); tokenRequest = StringEntity('{"session", "{email_address:""[email protected],""password:""password""}"}'); httppost.setEntity(tokenRequest); response = httpclient.execute(httppost);

On the last line, I get the error:

Java exception occurred: java.lang.VerifyError: Cannot inherit from final class

From searches online, I gather that this is a software version issue. I tried using the 4.2 builds of those files (the same ones used in the other post), but I received the same error. Does anyone have an idea what could be wrong? Or know a way to do what I am trying to do without using these external libraries?

EDIT:

originally I tried using this code:

tokenRequest = {'session', '{''email_address'':''[email protected]'',''password'':''password''}'}; token = urlread('http://localhost:3000/signin','POST',tokenRequest);

but I received the NoMethodError that led me to that other post:

NoMethodError (undefined method `each' for "{'email_address':'[email protected]','password':'password'}":String): app/models/session.rb:14:in `initialize'

I think the reason it throws this error is because the server thinks it is receiving a String object, which doesn't have an each method. I assume I would fix this by using the 'Content-Type' argument to specify that its json. Is there a way to do this using urlread?

EDIT: full stack trace for java libs issue

Java exception occurred: java.lang.VerifyError: Cannot inherit from final class at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(Unknown Source) at java.security.SecureClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.defineClass(Unknown Source) at java.net.URLClassLoader.access$000(Unknown Source) at java.net.URLClassLoader$1.run(Unknown Source) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(Unknown Source) at com.mathworks.jmi.CustomURLClassLoader.findClass(ClassLoaderManager.java:760) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClass(Unknown Source) at java.lang.ClassLoader.loadClassInternal(Unknown Source) at org.apache.http.impl.client.DefaultHttpClient.createHttpParams(DefaultHttpClient.java:157) at org.apache.http.impl.client.AbstractHttpClient.getParams(AbstractHttpClient.java:448) at org.apache.http.impl.client.AbstractHttpClient.createClientConnectionManager(AbstractHttpClient.java:309) at org.apache.http.impl.client.AbstractHttpClient.getConnectionManager(AbstractHttpClient.java:466) at org.apache.http.impl.client.AbstractHttpClient.createHttpContext(AbstractHttpClient.java:286) at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:851) at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:805) at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:784)

Anil Ali · Accepted Answer · 2013-01-09 02:45:54Z

1

Looks like the data being sent is not properly quoted. End result should be

{'email_address':'[email protected]','password':'password'}

Try changing the code to

tokenRequest = StringEntity('{"session", {"email_address":"[email protected]","password":"password"}}');

answered Jan 9, 2013 at 2:45

Anil Ali

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Cbas Over a year ago

Yes that would have been a problem. In the case where I use DefaultHttpClient though, the issue is that its not sending anything to the server - the java exception stops it. I rewrote my other script to match the end result you posted, but I still get the NoMethodError.

Cbas · Accepted Answer · 2013-01-11 00:05:21Z

urlread2 turned out to be a much better solution. This code does the job:

tokenRequest = '{ "session" : { "email_address": "[email protected]", "password": "password" } }'; header = http_createHeader('Content-Type','application/json'); token = urlread2('http://localhost:3000/signin.json','POST',tokenRequest,header);

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