public Servlet getServlet() throws ServletException, IOException, FileNotFoundException {
if (reload) {
synchronized (this) {
// Synchronizing on jsw enables simultaneous loading
// of different pages, but not the same page.
if (reload) {
// This is to maintain the original protocol.
destroy();
try {
servletClass = ctxt.load();
theServlet = (Servlet) servletClass.newInstance();
} catch (IllegalAccessException ex1) {
throw new JasperException(ex1);
} catch (InstantiationException ex) {
throw new JasperException(ex);
}
theServlet.init(config);
firstTime = false;
reload = false;
}
}
}
return theServlet;
}
public Servlet getServlet() throws ServletException {
// DCL on 'reload' requires that 'reload' be volatile
// (this also forces a read memory barrier, ensuring the
// new servlet object is read consistently)
if (reload) {
synchronized (this) {
// Synchronizing on jsw enables simultaneous loading
// of different pages, but not the same page.
if (reload) {
// This is to maintain the original protocol.
destroy();
final Servlet servlet;
try {
InstanceManager instanceManager = InstanceManagerFactory.getInstanceManager(config);
servlet = (Servlet) instanceManager.newInstance(ctxt.getFQCN(), ctxt.getJspLoader());
} catch (IllegalAccessException e) {
throw new JasperException(e);
} catch (InstantiationException e) {
throw new JasperException(e);
} catch (Exception e) {
throw new JasperException(e);
}
servlet.init(config);
if (!firstTime) {
ctxt.getRuntimeContext().incrementJspReloadCount();
}
theServlet = servlet;
reload = false;
// Volatile 'reload' forces in order write of 'theServlet' and new servlet object
}
}
}
return theServlet;
}