old DefaultHttpClient v CloseableHttpClient

[sam wootton]

Hi,

Thanks in advance for any help or advice.

I had a file upload application (from a java swing front-end to a tomcat servlet) - all worked fine. I started the project again (after a break) and found that API’s have been deprecated, and it no longer works. Im not sure where to begin to start getting it working again (what new API's to use).

When it was working the main constructs I had were (client-side):

Below was within my “UploadTask” (extends SwingWorker), in the doInBackground() method:

httpPost = new HttpPost(mfResource);
httpHost = new HttpHost("some_domain.com", 80, "http");

client = new DefaultHttpClient();

upc= new UsernamePasswordCredentials("username", "pwd");

client.getCredentialsProvider().setCredentials(AuthScope.ANY, usernamePasswordCredentials);

authCache = new BasicAuthCache();

localcontext = new BasicHttpContext();

basicScheme = new BasicScheme();

authCache.put(httpHost, basicScheme);

localcontext.setAttribute("http.auth.auth-cache", authCache);

multipartEntity = new ProgressMultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE, (ProgressListener) this);

userUploads = new FileBody(tmpUploads, "application/zip");

httpPost.setEntity(multipartEntity);

response = client.execute(httpHost, httpGet, localcontext);

I have attempted to refactor using CloseableHttpClient, but im not getting very far, and it seems to be stopping when I attempt:

CloseableHttpClient client = HttpClientBuilder.create().setDefaultCredentialsProvider(credsProvider).build();

Im not sure how much i need to rewrite / replace.

Any help is much appreciated.

Regards, Sam

[Winston Gutkowski]

sam wootton wrote:I had a file upload application (from a java swing front-end to a tomcat servlet) - all worked fine. I started the project again (after a break) and found that API’s have been deprecated, and it no longer works.

That seems odd. Deprecation shouldn't stop a class/method from working; you might just get compiler warnings when you try to update them. Are you sure you've got all the stuff you need (ie, jars, etc) in the CLASSPATH? That might have changed if you're on a new version.

Winston

[sam wootton]

Hi Winston ,

Thanks for your response.

System.out.println("BEFORE");
client = new DefaultHttpClient();
System.out.println("AFTER");

"BEFORE" will get output to the terminal, but "AFTER" will not. No errors, or warnings or exceptions.

I am using "httpclient-4.0-alpha1.jar", which is what I used when it was working. Literally, nothing else changed.

Regards, Sam

[Winston Gutkowski]

sam wootton wrote:"BEFORE" will get output to the terminal, but "AFTER" will not. No errors, or warnings or exceptions.
I am using "httpclient-4.0-alpha1.jar", which is what I used when it was working. Literally, nothing else changed.

Another possibility: What do you mean by a "terminal"? Are you running an IDE and using its CONSOLE? That might have a bearing - but exactly what I don't know; I do know that an IDE console is NOT the same thing as System.out though.

If the answer to the above question is "yes", then maybe you should try running it from the command line.

Winston

[sam wootton]

Its same thing; console/terminal etc.

I just cant seem to instantiate any http client without it failing silently, does matte what i try:

HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();

or (i know its deprecated, but there doesnt seem to be much out there to help with replacing existing code with the new API).

client = new DefaultHttpClient();

With httpclient-4.0-alpha1.jar. I'd like to find a recourse that can clearly state what I need, and what changes required to use new API.

But first off, why can't I even instantiate an HTTP Client?

Regards, Sam

[sam wootton]

If I simplify down to basics and just run:

public static void main(String args[]) throws java.io.IOException
    {
        HttpHost httpHost = new HttpHost("samwootton.com:8080/mfservice/music", 8080, "http");
        HttpClientBuilder httpClientBuilder = HttpClientBuilder.create();
        CloseableHttpClient closeableHttpClient = HttpClients.createDefault();
    }

I get...

Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/commons/logging/LogFactory
	at org.apache.http.conn.ssl.AbstractVerifier.<init>(AbstractVerifier.java:82)
	at org.apache.http.conn.ssl.AllowAllHostnameVerifier.<init>(AllowAllHostnameVerifier.java:40)
	at org.apache.http.conn.ssl.SSLSocketFactory.<clinit>(SSLSocketFactory.java:148)
	at org.apache.http.impl.client.HttpClientBuilder.build(HttpClientBuilder.java:455)
	at org.apache.http.impl.client.HttpClients.createDefault(HttpClients.java:49)
	at client.MFClient.main(MFClient.java:37)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: java.lang.ClassNotFoundException: org.apache.commons.logging.LogFactory
	at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:357)

Looks like it can't find the class?

Regards, Sam

[sam wootton]

And

Exception in thread "main" java.lang.NoSuchFieldError: INSTANCE
	at org.apache.http.impl.io.DefaultHttpRequestWriterFactory.<init>(DefaultHttpRequestWriterFactory.java:52)
	at org.apache.http.impl.io.DefaultHttpRequestWriterFactory.<init>(DefaultHttpRequestWriterFactory.java:56)
	at org.apache.http.impl.io.DefaultHttpRequestWriterFactory.<clinit>(DefaultHttpRequestWriterFactory.java:46)
	at org.apache.http.impl.conn.ManagedHttpClientConnectionFactory.<init>(ManagedHttpClientConnectionFactory.java:69)
	at org.apache.http.impl.conn.ManagedHttpClientConnectionFactory.<init>(ManagedHttpClientConnectionFactory.java:81)
	at org.apache.http.impl.conn.ManagedHttpClientConnectionFactory.<clinit>(ManagedHttpClientConnectionFactory.java:56)
	at org.apache.http.impl.conn.PoolingHttpClientConnectionManager$InternalConnectionFactory.<init>(PoolingHttpClientConnectionManager.java:487)
	at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.<init>(PoolingHttpClientConnectionManager.java:147)
	at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.<init>(PoolingHttpClientConnectionManager.java:136)
	at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.<init>(PoolingHttpClientConnectionManager.java:112)
	at org.apache.http.impl.client.HttpClientBuilder.build(HttpClientBuilder.java:459)
	at org.apache.http.impl.client.HttpClients.createDefault(HttpClients.java:49)
	at client.MFClient.main(MFClient.java:37)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:606)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)

Regards, Sam

[sam wootton]

I think it could be dependencies

http://hc.apache.org/httpcomponents-client-4.3.x/httpclient/dependencies.html

Will give it a go and report back.

Regards, Sam

[Winston Gutkowski]

sam wootton wrote:Its same thing; console/terminal etc.

Maybe for you, but THEY are NOT.

My suggestion: run this from the command line, and keep doing so until you can get it to work. IDEs hide an awful lot of stuff, including (possibly) messages that you should know about. Once you can run it from the command line, you'll KNOW that you can run it from anywhere; but not otherwise.

Winston

[sam wootton]

Using the new

httpcomponents-client-4.3.3\lib

that contains:

commons-codec-1.6
commons-logging-1.1.3
httpclient-4.3.3
httpcore-4.3.2

.. seems to have allowed me to progress - got a few other errors, but hopefully unrelated.

Many thanks.

Regards, Sam