Hi all,
We have a chart library that we use to serve images for our application. To
integrate with our Seam app, we wrote a simple servlet that invokes the library
and return a URL of the created image. The library requires a datasource and
user ID so I use dependency injection. However, during runtime, the injection
objects are all null.
Here is the code for the servlet:
public class GetChart extends HttpServlet {
|
| @In("quoteDS")
| private ChartDatasource quoteDS;
|
| @In
| private WcLoginSession wcLoginSession;
|
| protected void doGet(HttpServletRequest request, HttpServletResponse
response) throws ServletException, IOException {
| try {
| writeChart(request, response);
| } catch (Exception e) {
| e.printStackTrace();
| }
| }
|
| private void writeChart(HttpServletRequest request, HttpServletResponse
response) throws Exception {
| OutputStream out = response.getOutputStream();
| try {
| response.setContentType("img/png");
| ChartCriteria chartCriteria =
ChartCriteria.fromRequest(request);
| if (chartCriteria != null) {
| writeChart(out, chartCriteria);
| }
| } finally {
| try {
| out.flush();
| } catch (IOException e) {
| e.printStackTrace();
| }
| out.close();
| }
| }
|
| private void writeChart(OutputStream out, ChartCriteria chartCriteria) {
| Chart chart = new Chart(wcLoginSession.getMyLoginId(),
chartCriteria);
| try {
| chart.build(quoteDS, out);
| } catch (Exception e) {
| e.printStackTrace();
| }
| }
| }
|
Why would my injections not working? Is there a better way to do this?
I am running Seam 2.0.0CR2 with JBoss 4.2.1GA.
Thanks in advance for your help.
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