I am learning Liferay 7 and I am using Liferay 7 ga3.
I have problem with accessing OSGi service from JSF backing bean.
I followed documentation from page https://dev.liferay.com/develop/tutorials/-/knowledge_base/7-0/services-in-jsf but all that I was able to achieve was exception:
java.lang.ClassCastException: com.sun.proxy.$Proxy688 cannot be cast to cz.test.service.EmployeeLocalService
at cz.kbe.liferay.primefaces.bean.TestBean.getTestStr(TestBean.java:37)
There is my attepmts:
First of all I have generated simple service using serviceBuilder that reads content of "Employee" MySQL table.
After that I have generated simple MVCportlet (standard "Hello from JSP page" portlet and I modified portlet class doView() method to print out information taken from service:
-------------
public class TestwebmvcportletPortlet extends MVCPortlet {
private EmployeeLocalService employeeLocalService = null;
@Reference
public void setEmployeeLocalService(EmployeeLocalService employeeLocalService) {
this.employeeLocalService = employeeLocalService;
}
@Override
public void doView(RenderRequest renderRequest, RenderResponse renderResponse)
throws IOException, PortletException {
// TODO Auto-generated method stub
int empCnt = employeeLocalService.getEmployeesCount();
System.out.println("INJECTED SERVICE:" + empCnt + " from object:"+employeeLocalService);
Bundle bundle = FrameworkUtil.getBundle(this.getClass());
BundleContext bundleContext = bundle.getBundleContext();
ServiceTracker<EmployeeLocalService, EmployeeLocalService> serviceTracker = new ServiceTracker<>(bundleContext,
EmployeeLocalService.class, null);
serviceTracker.open();
EmployeeLocalService svc2 = serviceTracker.getService();
int empCnt2 = svc2.getEmployeesCount();
System.out.println("SERVICE TRACKER:" + empCnt2 + " from object:"+svc2);
serviceTracker.close();
super.doView(renderRequest, renderResponse);
}
}
--------------
Everything works flawless, the output in log was:
INJECTED SERVICE:3 from object:cz.test.service.impl.EmployeeLocalServiceImpl@2fd0b37b
SERVICE TRACKER:3 from object:cz.test.service.impl.EmployeeLocalServiceImpl@2fd0b37b
So the injected and service tracker gives me the same object.
After that I generated JSF project using wizard on
liferayfaces.org, I selected Liferay 7, JSF2.2, Primefaces an gradle.
Generated JSF primefaces portlet works well.
The documented approach https://dev.liferay.com/develop/tutorials/-/knowledge_base/7-0/services-in-jsf does not work, the portlet throws exception described above.
So I simplified the thing to basic - I created primefaces backing bead that holds one string attribute and I modified getter for this attribute to give me service using service tracker:
------
public String getTestStr() {
Bundle bundle = FrameworkUtil.getBundle(this.getClass());
BundleContext bundleContext = bundle.getBundleContext();
ServiceTracker<EmployeeLocalService, EmployeeLocalService> employeeLocalServiceTracker = new ServiceTracker<>(bundleContext,
EmployeeLocalService.class, null);
employeeLocalServiceTracker.open();
if (employeeLocalServiceTracker.isEmpty()) {
System.out.println("employeeLocalServiceTracker IS EMPTY");
} else {
System.out.println("employeeLocalServiceTracker IS NOT EMPTY");
System.out.println("SERVICE OBJECT: " + employeeLocalServiceTracker.getService());
EmployeeLocalService employeeLocalService = employeeLocalServiceTracker.getService();
testStr = "Count: " + employeeLocalService.getEmployeesCount();
}
employeeLocalServiceTracker.close();
// employeeLocalService.findByEmpid(1);
return testStr;
}
-------
The result has been the same - the exception cannot cast Proxy displayed directly on the primefaces portlet
I created page that contains both MVC and JSFportlet and there is logs:
employeeLocalServiceTracker IS NOT EMPTY
SERVICE OBJECT: cz.test.service.impl.EmployeeLocalServiceImpl@2fd0b37b
INJECTED SERVICE:3 from object:cz.test.service.impl.EmployeeLocalServiceImpl@2fd0b37b
SERVICE TRACKER:3 from object:cz.test.service.impl.EmployeeLocalServiceImpl@2fd0b37b
So I am bale to cass service toString() method, but when I am trying to cast the object to Interface - exception is thrown.
So the MVCportlet injected service, MVCportle service tracker provided service and the JSF protlet service tracker provided service ARE THE SAME OBJECT!
Now I am out of options, please any ideas why I am not able to consume OSGi service from JSF bean?
Thanks for any ideas, current situation is showstopper for me.
