How to get person in alfresco share through java?

Question

I am new to alfresco community and I have created persons in alfresco community by using java.

But now i want to get that user data by using java. I am trying like below but it raises null pointer exception.

PersonServiceImpl personServiceImpl = new PersonServiceImpl();
        NodeRef nodeRef = personServiceImpl.getPerson("sobhan");
        System.out.println("Person Service imple "+nodeRef);

Error is

Aug 03, 2016 5:43:32 PM org.apache.catalina.core.ApplicationContext log
INFO: Initializing Spring FrameworkServlet 'testing'
+==========================================
uplaod file 
Aug 03, 2016 5:43:58 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [testing] in context with path [/SpringWithAlfrescoScreens] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
java.lang.NullPointerException
    at org.alfresco.repo.security.person.PersonServiceImpl.getFromCache(PersonServiceImpl.java:1827)
    at org.alfresco.repo.security.person.PersonServiceImpl.getPersonOrNullImpl(PersonServiceImpl.java:530)
    at org.alfresco.repo.security.person.PersonServiceImpl.getPersonImpl(PersonServiceImpl.java:489)
    at org.alfresco.repo.security.person.PersonServiceImpl.getPerson(PersonServiceImpl.java:476)
    at org.alfresco.repo.security.person.PersonServiceImpl.getPerson(PersonServiceImpl.java:433)
    at com.plianto.dmsservice.DummyDmsService.perm(DummyDmsService.java:70)
    at com.service.AlfService.saveApplication(AlfService.java:116)
    at com.controller.AlfController.saveApplication(AlfController.java:146)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:221)
    at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:137)
    at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:110)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod(RequestMappingHandlerAdapter.java:777)
    at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:706)
    at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:85)
    at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:943)
    at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:877)
    at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:966)
    at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:857)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
    at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:842)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:243)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:222)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:171)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:953)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:408)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1041)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:603)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:310)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
    at java.lang.Thread.run(Thread.java:745)

Answer 1

I resume and answer here since it is difficult to post code in comments :

As Walfrat said :

You shouldn't create a new PersonServiceImpl but inject the existing one in the configuration.

because the person service is handled by Spring.

In your context file, for your service com.plianto.dmsservice.MyService, you should declare the existing person service this way :

<bean id="dummyDmsService" class="com.plianto.dmsservice.DummyDmsService">
    <property name="personService">
        <ref bean="PersonService" />
    </property>
</bean>

And then in your class :

public class DummyDmsService{
    private PersonService personService;

    /**
     * @return the personService
     */
    public final PersonService getPersonService() {
        return personService;
    }

    /**
     * @param pPersonService
     *            the personService to set
     */
    public final void setPersonService(final PersonService pPersonService) {
        personService = pPersonService;
    }
    ...
}