Can you post the rest of your code, what's in the body of the response when you get the 400 response ?

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SimonF wrote:

Can you post the rest of your code, what's in the body of the response when you get the 400 response ?

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Thanks for the response.

By body of the response, do you mean the responseBody field of the PostMethod class?

If so, that comes back null.

I've pasted the full create method below. This is identical to the successful create for the non-custom object (which is from the code for the sample app ):

private String createOpportunityAccount(String name, String instanceUrl,
			String accessToken, PrintWriter writer) throws ServletException,
			IOException {
		String accountId = null;

		HttpClient httpclient = new HttpClient();

		JSONObject account = new JSONObject();

		try {
			account.put("Name", name);
		} catch (JSONException e) {
			e.printStackTrace();
			throw new ServletException(e);
		}

		PostMethod post = new PostMethod(instanceUrl
				+ "/services/data/v20.0/sobjects/OpportunityAccount__c/");

		post.setRequestHeader("Authorization", "OAuth " + accessToken);
		post.setRequestEntity(new StringRequestEntity(account.toString(),
				"application/json", null));

		try {
			httpclient.executeMethod(post);

			writer.write("HTTP status " + post.getStatusCode()
					+ " creating account\n\n");

			if (post.getStatusCode() == HttpStatus.SC_CREATED) {
				try {
					JSONObject response = new JSONObject(new JSONTokener(
							new InputStreamReader(
									post.getResponseBodyAsStream())));
					System.out.println("Create response: "
							+ response.toString(2));

					if (response.getBoolean("success")) {
						accountId = response.getString("id");
						writer.write("New record id " + accountId + "\n\n");
					}
				} catch (JSONException e) {
					e.printStackTrace();
					// throw new ServletException(e);
				}
			}
		} finally {
			post.releaseConnection();
		}

		return accountId;
	}