用eclipse开发，在SWT画面的按钮事件中，生成html报表，第一次执行，一切正常，不关闭画面，第二次点击按钮的时候。factory.createReportEngine(config);报错。
Exception in thread "main" java.lang.ExceptionInInitializerError
at org.eclipse.birt.report.engine.api.impl.ReportEngineFactory.createReportEngine(ReportEngineFactory.java:13)
at com.rad.oes.form.CpBillEntry$BtnSend_selected.widgetSelected(CpBillEntry.java:2247)
恳请大师们指点指点。

代码如下，

public void widgetSelected(org.eclipse.swt.events.SelectionEvent e) {
IReportEngine engine = null;
IReportEngineFactory factory = null;
EngineConfig config = null;
try {
config = new EngineConfig();

config.setEngineHome("D:/birt-runtime-2_3_1/ReportEngine");
config.setLogConfig("D:/oesproject", Level.FINE);

Platform.startup(config); // If using RE API in Eclipse/RCP
// application this is not needed.
factory = (IReportEngineFactory) Platform
.createFactoryObject(IReportEngineFactory.EXTENSION_REPORT_ENGINE_FACTORY);
engine = factory.createReportEngine(config);

engine.changeLogLevel(Level.WARNING);

} catch (Exception ex) {
ex.printStackTrace();
}
// Run reports, etc.
HTMLRenderOption emitterConfig = new HTMLRenderOption();
emitterConfig.setActionHandler(new HTMLActionHandler());
HTMLServerImageHandler imageHandler = new HTMLServerImageHandler();
emitterConfig.setImageHandler(imageHandler);
config.getEmitterConfigs().put("html", emitterConfig);
IReportRunnable design = null;
try {
design = engine
.openReportDesign("D:/oesproject/reports/new_report.rptdesign");
} catch (EngineException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}

// 创建报表任务
IRunAndRenderTask task = engine.createRunAndRenderTask(design);

emitterConfig.setBaseURL("http://localhost/");
emitterConfig.setBaseImageURL("http://localhost/myimages");
emitterConfig.setSupportedImageFormats("JPG;PNG;BMP;SVG");
HashMap<String, HTMLRenderOption> contextMap = new HashMap<String, HTMLRenderOption>();
contextMap.put(EngineConstants.APPCONTEXT_HTML_RENDER_CONTEXT,
emitterConfig);
task.setAppContext(contextMap);
// 设置输出本地文件
options.setOutputFileName("D:/oesproject/reports/output.html");

// 设置输出文件格式
options.setOutputFormat("html");
task.setRenderOption(options);

// run and render report
try {
task.run();
} catch (EngineException e2) {
// TODO Auto-generated catch block
e2.printStackTrace();
}
task.close();

engine.destroy();
Platform.shutdown();

}

你有msn么，交流下birt