Guice 配置错误:未绑定任何实现
我试图让DI与Guice一起工作,做(在我看来)完全符合手册中的内容。
我无法解释这个问题,因为我并不真正理解它 - 一切似乎都非常合乎逻辑,应该有效。但事实并非如此。因此,我只能附加代码和堆栈跟踪:
public class Runner {
public static void main(String[] args) {
Injector injector = Guice.createInjector(new TestModule());
//next line throws the exception
JMeterComponent jMeterComponent =
injector.getInstance(JMeterComponent.class);
....
}
}
如您所见,我正在尝试实例化类的对象。它的构造函数(正如您稍后将看到的)接受3个参数:所有这些参数也应该由IoC实例化并注入。JMeterComponent
以下是这3个参数的配置:TestModule
public class TestModule extends AbstractModule {
@Override
protected void configure() {
bind(Callable.class).annotatedWith(Names.named("JMeter"))
.to(JMeterTask.class);
bind(Processor.class).annotatedWith(Names.named("JMeter"))
.to(JMeterResultsProcessor.class);
bind(Renderer.class).annotatedWith(Names.named("JMeter"))
.to(JMeterResultsWikiRenderer.class);
}
}
现在,让我们看一下那些具体的实现 - 和(为了简单起见,它们都有假体):JMeterTask
JMeterResultsProcessor
JMeterResultsWikiRenderer
public class JMeterTask implements Callable<JMeterRawResults> {
public JMeterRawResults call() throws Exception {
return new JMeterRawResults();
}
}
public class JMeterResultsProcessor implements
Processor<JMeterRawResults, JMeterResults> {
public JMeterResults process(JMeterRawResults raw) {
return new JMeterResults();
}
}
public class JMeterResultsWikiRenderer implements Renderer<JMeterResults> {
public Map<String, String> render(JMeterResults jMeterResults) {
Map<String, String> results = Maps.newHashMap();
...
return results;
}
}
现在让我们看一下类,哪个实例的构造是这里整个DI相关内容的目标:JMeterComponent
public class JMeterComponent extends AbstractComponent<String, String> {
@Inject
public JMeterComponent(@Named("JMeter") Callable<String> task,
@Named("JMeter")Processor<String, String> processor,
@Named("JMeter")Renderer<String> renderer) {
super(task, processor, renderer);
}
}
下面是堆栈跟踪:
Exception in thread "main" com.google.inject.ConfigurationException: Guice configuration errors:
1) No implementation for stat.domain.Processor<java.lang.String, java.lang.String> annotated with @com.google.inject.name.Named(value=JMeter) was bound.
while locating stat.domain.Processor<java.lang.String, java.lang.String> annotated with @com.google.inject.name.Named(value=JMeter)
for parameter 1 at stat.components.jmeter.JMeterComponent.<init>(JMeterComponent.java:18)
while locating cstat.components.jmeter.JMeterComponent
2) No implementation for stat.domain.Renderer<java.lang.String> annotated with @com.google.inject.name.Named(value=JMeter) was bound.
while locating stat.domain.Renderer<java.lang.String> annotated with @com.google.inject.name.Named(value=JMeter)
for parameter 2 at stat.components.jmeter.JMeterComponent.<init>(JMeterComponent.java:18)
while locating stat.components.jmeter.JMeterComponent
3) No implementation for java.util.concurrent.Callable<java.lang.String> annotated with @com.google.inject.name.Named(value=JMeter) was bound.
while locating java.util.concurrent.Callable<java.lang.String> annotated with @com.google.inject.name.Named(value=JMeter)
for parameter 0 at stat.components.jmeter.JMeterComponent.<init>(JMeterComponent.java:18)
while locating stat.components.jmeter.JMeterComponent
一些额外的事实:
- 我使用 guice-2.0 (带标签)
featured
- 在代码中的任何其他类中,不再有任何来自包的任何注释
com.google.inject
- 接口并放置在一个模块中,它们的-实现(和其他)和类放置在另一个模块中。
Processor
Renderer
jmeter
JMeterResultsProcessor
JMeterComponent
这几乎是所有关于它要说的。
很抱歉这么长的帖子,并感谢您的耐心阅读到最后。
关于为什么会发生错误以及如何解决它的任何想法?