Twitter4j problem "cannot instantiate type Twitter"

jesse.co

Twitter4j problem "cannot instantiate type Twitter"

in Contributed Library Questions • 2 years ago

Hello,

I am trying to create a sketch that queries twitter using the twitter4j library. I'm trying to get started using the tutorial at this URL:
http://blog.blprnt.com/blog/blprnt/quick-tutorial-twitter-processing

which directs me to http://twitter4j.org/en/index.html to download twitter4j-2.0.8.jar. I noticed that the version number has increased so I download http://twitter4j.org/en/twitter4j-2.2.0.zip and unpack it.

There is no twitter4j-2.2.0.jar so I figure they split up things into different jars that you can import separately so I stuck them in my libraries directory and changed the name of the folders and jars per the error message I received regarding invalid characters being in the jar name. I also moved the dirs from the zip containing source and such into their respective directories.

Here is what my tree looks like currently:

├───twitter4jasync220
│   ├───javadoc
│   │   ├───META-INF
│   │   ├───resources
│   │   └───twitter4j
│   │       ├───api
│   │       │   └───class-use
│   │       ├───class-use
│   │       └───internal
│   │           └───async
│   │               └───class-use
│   ├───library
│   └───src
│       ├───main
│       │   ├───java
│       │   │   └───twitter4j
│       │   │       ├───api
│       │   │       └───internal
│       │   │           └───async
│       │   └───resources
│       │       └───META-INF
│       └───test
│           ├───java
│           │   └───twitter4j
│           │       └───internal
│           │           └───async
│           └───resources
├───twitter4jcore220
│   ├───javadoc
│   │   ├───META-INF
│   │   ├───resources
│   │   └───twitter4j
│   │       ├───api
│   │       │   └───class-use
│   │       ├───auth
│   │       │   └───class-use
│   │       ├───class-use
│   │       ├───conf
│   │       │   └───class-use
│   │       ├───json
│   │       │   └───class-use
│   │       └───util
│   │           └───class-use
│   ├───library
│   └───src
│       ├───main
│       │   ├───java
│       │   │   └───twitter4j
│       │   │       ├───api
│       │   │       ├───auth
│       │   │       ├───conf
│       │   │       ├───internal
│       │   │       │   ├───http
│       │   │       │   ├───json
│       │   │       │   ├───logging
│       │   │       │   ├───org
│       │   │       │   │   └───json
│       │   │       │   └───util
│       │   │       ├───json
│       │   │       └───util
│       │   └───resources
│       │       └───META-INF
│       └───test
│           ├───java
│           │   └───twitter4j
│           │       ├───auth
│           │       ├───conf
│           │       ├───http
│           │       ├───internal
│           │       │   ├───org
│           │       │   │   └───json
│           │       │   └───util
│           │       └───util
│           └───resources
├───twitter4jexamples220
│   ├───javadoc
│   │   ├───META-INF
│   │   ├───resources
│   │   └───twitter4j
│   │       └───examples
│   │           ├───account
│   │           │   └───class-use
│   │           ├───async
│   │           │   └───class-use
│   │           ├───block
│   │           │   └───class-use
│   │           ├───directmessage
│   │           │   └───class-use
│   │           ├───favorite
│   │           │   └───class-use
│   │           ├───friendsandfollowers
│   │           │   └───class-use
│   │           ├───friendship
│   │           │   └───class-use
│   │           ├───geo
│   │           │   └───class-use
│   │           ├───help
│   │           │   └───class-use
│   │           ├───json
│   │           │   └───class-use
│   │           ├───legal
│   │           │   └───class-use
│   │           ├───list
│   │           │   └───class-use
│   │           ├───listmembers
│   │           │   └───class-use
│   │           ├───listsubscribers
│   │           │   └───class-use
│   │           ├───media
│   │           │   └───class-use
│   │           ├───notification
│   │           │   └───class-use
│   │           ├───oauth
│   │           │   └───class-use
│   │           ├───savedsearches
│   │           │   └───class-use
│   │           ├───search
│   │           │   └───class-use
│   │           ├───spamreporting
│   │           │   └───class-use
│   │           ├───stream
│   │           │   └───class-use
│   │           ├───timeline
│   │           │   └───class-use
│   │           ├───trends
│   │           │   └───class-use
│   │           ├───tweets
│   │           │   └───class-use
│   │           └───user
│   │               └───class-use
│   ├───library
│   └───src
│       ├───main
│       │   ├───java
│       │   │   └───twitter4j
│       │   │       └───examples
│       │   │           ├───account
│       │   │           ├───async
│       │   │           ├───block
│       │   │           ├───directmessage
│       │   │           ├───favorite
│       │   │           ├───friendsandfollowers
│       │   │           ├───friendship
│       │   │           ├───geo
│       │   │           ├───help
│       │   │           ├───json
│       │   │           ├───legal
│       │   │           ├───list
│       │   │           ├───listmembers
│       │   │           ├───listsubscribers
│       │   │           ├───media
│       │   │           ├───notification
│       │   │           ├───oauth
│       │   │           ├───savedsearches
│       │   │           ├───search
│       │   │           ├───spamreporting
│       │   │           ├───stream
│       │   │           ├───timeline
│       │   │           ├───trends
│       │   │           ├───tweets
│       │   │           └───user
│       │   └───resources
│       │       └───META-INF
│       └───test
│           └───java
│               └───twitter4j
├───twitter4jmediasupport220
│   ├───javadoc
│   │   ├───META-INF
│   │   ├───resources
│   │   └───twitter4j
│   │       └───media
│   │           └───class-use
│   ├───library
│   └───src
│       ├───main
│       │   ├───java
│       │   │   └───twitter4j
│       │   │       └───media
│       │   └───resources
│       │       └───META-INF
│       └───test
│           ├───java
│           │   └───twitter4j
│           │       └───media
│           └───resources
└───twitter4jstream220
    ├───javadoc
    │   ├───META-INF
    │   ├───resources
    │   └───twitter4j
    │       └───class-use
    ├───library
    └───src
        ├───main
        │   ├───java
        │   │   └───twitter4j
        │   └───resources
        │       └───META-INF
        └───test
            ├───java
            │   └───twitter4j
            │       └───json
            └───resources
                └───dao

I am able to import the libraries however when I try to run the following code I receive the error, "Cannot instantiate the type Twitter"

Twitter myTwitter;

void setup() {

myTwitter = new Twitter( "yourTwitterUserName" , "yourTwitterPassword" );

};

void draw() {

};

Can anyone tell me where I went wrong and set me on the right track? I have tried importing each library separately and them all at once as well with no difference. :(

Replies(6)

yusukey

Re: Twitter4j problem "cannot instantiate type Twitter"

2 years ago

Hi,

Use of basic authentication has been deprecated and now you need to use OAuth.

Try this:

http://tinkerlondon.com/now/2010/09/14/oauth-twitter-and-processing/

jesse.co

Re: Twitter4j problem "cannot instantiate type Twitter"

2 years ago

Awesome, thanks for the reply! I'll try that first thing tomorrow.

So, am I getting that error because authentication failed? I thought it was because I hadn't imported something properly. Is the way I have the twitter4j libraries set up valid?

thanks again!

yusukey

Re: Twitter4j problem "cannot instantiate type Twitter"

2 years ago

" Cannot instantiate the type Twitter" sounds like that you haven't imported Twitter4J properly.

Try adding twitter4j-core-2.2.0.jar into your classpath.

jesse.co

Re: Twitter4j problem "cannot instantiate type Twitter"

2 years ago

Try adding twitter4j-core-2.2.0.jar into your classpath.

I definitely would if there were such a thing, haha.

I feel like such a noob, the actual twitter4j stuff doesn't seem too hard to use but I'm still having trouble getting processing to find all my libraries. Now it can't find twitter4j.http oh my. Well, back to pokin' around!

jesse.co

Re: Twitter4j problem "cannot instantiate type Twitter"

2 years ago

Update! I've binned the idea of importing the libraries and just dragged all the .jars in the lib folder into processing(I know this isn't best practice) and now I've got some more helpful errors :)

Below is what I'm fooling around with. A mishmash of two examples and some fiddling with Twitterfactory based on info from the javadoc. When I get this to work I believe I'll be in good shape for what I want to do.

String consumer_key = "my Key";
String consumer_secret = "my secret";
String oauth_token = "my token";
String oauth_token_secret = "my token secret";
String searchfor = "search terms";
color bgcolor = color(255);
long timer;
void setup() {
size(640,480);
}
void draw() {
background(bgcolor);
if (millis()-timer > 2000) bgcolor = color(255);
}
void mousePressed() {
Twitter twitter = new TwitterFactory().getInstance (new AccessToken(consumer_key, consumer_secret));
try {
QueryResult result = twitter.search(new Query(searchfor));
List<Tweet> tweets = result.getTweets();
for (Tweet tweet : tweets) {
println("@" + tweet.getFromUser() + " - " + tweet.getText());
}
bgcolor = color(0,0,255);
timer = millis();
} catch (TwitterException te) {
te.printStackTrace();
println("Failed to search tweets: " + te.getMessage());
}
}

yusukey

Re: Re: Twitter4j problem "cannot instantiate type Twitter"

2 years ago

You should provide oauth_token and oauth_token_secret to the AccessToken constructor instead consumer secret/key.

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