java – 注入空指针

我们有一个绑定模块：

public class StandardModule extends AbstractModule {

    @Override
    protected void configure() {

       bind(Language.class).to(Polish.class);

    }
 }

和一个使用这个注入对象的classe(AboutDialog.java)

@Inject Language language;

public AboutDialog(JFrame parent) {
    super(parent,"",true);
    this.language=language;
    this.setTitle(language.getLanguageInUse().getString("AboutDialog.title"));
    this.parent = parent;
    try {
        jbInit();
    } catch (Exception e) {
        e.printstacktrace();
    }
    pack();
}

我们也有结果：

java.lang.NullPointerException at net.sf.jmoney.gui.AboutDialog.<init>(AboutDialog.java:67)

第67行是：

this.setTitle(language.getLanguageInUse().getString("AboutDialog.title"));

我们的界面是：

public interface Language {

    public ResourceBundle getLanguageInUse();
}

波兰班是：

public class Polish implements Language {

    private ResourceBundle languageInUse;

    public Polish() {
        languageInUse = ResourceBundle.getBundle(Constants.LANGUAGE_PL);
    }

    public ResourceBundle getLanguageInUse() {
        return languageInUse;
    }


}

我们迷路了…