问题
I am developing e4 application. I want to inject EPartService outside the Part and Handler when i am injecting EPartService then i will get null pointer error
public class DisplayRuntimePart {
@Inject EPartService partService;
private void displayPart(){
MPart part=partService.findPart("com.rcpe4.myproject.part.datapart");
mpart.setVisible(true);
partService.showPart(mpart, PartState.CREATE);
}
}
I am also read this question but till not solve my problem E4 EPartService findPart() throwing java.lang.Null Pointer Exception
Edit I am inject EPartService in Part class. Class URI in Application.e4xml is bundleclass://com.abc.test/com.abc.test.part.MyPart in this class I am write code as follows.
Class Mypart{
@Inject EPartService prtservice;
@Inject
public MyPart() {
}
@PostConstruct
public void postConstruct(Composite parent) {
parent.setLayout(new FillLayout(SWT.HORIZONTAL));
htmlBrowser = new Browser(parent, SWT.NONE);
}
@PreDestroy
public void preDestroy() {
}
@Focus
public void onFocus() {
}
@Persist
public void save() {
}
public dispalyPart(){
MPart mpart=partService.findPart("com.abc.test.part.datapart"); **Here Getting Null Pointer Exception**
mpart.setVisible(true);
partService.showPart(mpart, PartState.CREATE);
}
}
回答1:
Eclipse only does direct injection on objects that it 'knows' about - basically objects mentioned in the application model (e4xmi) files or created using something like EPartService.showPart
.
If you want to do direct injection on objects that you create then you need to create them using ContextInjectionFactory
. For example:
@Inject IEclipseContext context;
...
MyClass myClass = ContextInjectionFactory.make(MyClass.class, context);
you can also do injection on a class created in the normal way with:
ContextInjectionFactory.inject(myClass, context);
(this will not do injection on the constructor).
Note: Since this code is using direct injection you must run it from a class that the Eclipse application model does know about such as a command handler or an MPart.
来源:https://stackoverflow.com/questions/25759291/how-to-inject-epartservice