Hi.
I emailed before about an error i encountered when i was creating a client
using Hessian 3.1.1. I was trying call a Hessian service without using the
HessianProxyFactory. My reason for doing this is to have more control over
the Url Connection object. Anyways, an exception Encountered an
IOExceptionWrapper: java.lang.UnsupportedOperationException was thown
whenever an exception has been thrown by the service class. The fix was to
use the older version HessianOutput instead of Hessian2Output to encode the
request that i have created.
Here's the code for those who are interested. I used HttpClient of Jakarta
Commons to handle my Http Connection:
START OF CODE
1 public Object connect(String id, String pwd, String method, Object[]
param)
2 throws Exception {
3 // Create an httpClient instance
4 HttpClient httpClient = new HttpClient();
5 URL url = new URL(address);
6 httpClient.getParams().setCookiePolicy(CookiePolicy.IGNORE_COOKIES);
7 // Set username and password
8 httpClient.getState().setCredentials(
9 new AuthScope(url.getHost(), url.getPort(), null),
10 new UsernamePasswordCredentials(id, pwd)
11 );
12 // Transform request to Hessian binary
13 ByteArrayOutputStream out = new ByteArrayOutputStream();
14 try {
15 AbstractHessianOutput output = new HessianOutput(out);
16 output.startCall(method);
17 for (int i = 0; param != null && i < param.length; i++) {
18 output.writeObject(param[i]);
19 }
20 output.completeCall();
21 output.flush();
22 } finally {
23 out.close ();
24 }
25 // Insert binary stream to connection
26 PostMethod httpMethod = new PostMethod(url.toString());
27 httpMethod.setDoAuthentication(true);
28 ((PostMethod) httpMethod).setRequestEntity(
29 new ByteArrayRequestEntity(out.toByteArray())
30 );
31 try {
32 // Call service
33 int status = httpClient.executeMethod(httpMethod);
34 if (status == HttpURLConnection.HTTP_OK) {
35 // Read reply
36 AbstractHessianInput input =
37 new Hessian2Input(httpMethod.getResponseBodyAsStream());
38 input.startReply();
39 Object obj = input.readObject();
40 input.completeReply ();
41 if (obj instanceof Throwable) {
42 throw (Throwable) obj;
43 } else {
44 return obj;
45 }
46 } else {
47 System.out.println(httpMethod.getResponseBodyAsString());
48 }
49 } catch (Throwable e) {
50 throw new Exception(e);
51 } finally {
52 System.out.println("status: " + httpMethod.getStatusLine());
53 httpMethod.releaseConnection();
54 }
55 return null;
56 }
END OF CODE
Btw, to Ben, thanks for your help.
- ian
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