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Build error in eclipse

I am new to Eclipse and Java.

I am wondering if the following error is an Eclipses compiler or my installation.

I defined an open class inside an open class to determine the return type for the service method.

public class ServiceThing {
    public class ReturnType {...}
    public ReturnType serviceMethod (...) {...}
    ...
}

In the class where I call the service method, I set the ReturnType type to store the default message:

ReturnType returnType = new ReturnType(...);

When I try to create this, I get the following errors:

Building workspace: Errors occurred during assembly. Runtime error builder 'Java Builder' in project 'XXXX.android'. java.lang.ArrayIndexOutOfBoundsException

Save failed: Save failure; java.lang.NullPointerException

I found out the required syntax:

ServiceThing serviceThing = ...; 
ReturnType returnType = serviceThing.new ReturnType(...);

However, the compiler should not throw a nullpointerException.

+5
1

ReturnType a public static class,

ReturnType returnType = new ReturnType(...);

, .

- static . ServiceThing ReturnType .

+4

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