当使用JSR330提供程序时，线程Beans不会在春季获得环境@自动访问

Question

希望这个问题是不言而喻的

ClassA.java

@Component
@Scope(ConfigurableBeanFactory.SCOPE_PROTOTYPE)
public class ClassA implements InterB {
    private static int counter=0;

    private int objectid = 0;
    @Autowired
    InterA abcd;

    public ClassA() {
        super();
        this.objectid = ++counter;
    }

    @Override
    public void dododo() {
        System.out.println("instance number "+objectid++);
        abcd.doit();
    }
}

ClassB.java

@Component
@Conditional(OracleDBEngineCondition.class)
public class ClassB extends DummyParent implements InterA {
    @Autowired
    private Environment env;

    @Override
    public void doit() {
        System.out.println("hoo hoo" +" -- "+env.getProperty("DBENGINE"));
    }

}

ClassC.java

@Component("classc")
public class ClassC implements Runnable {

    @Autowired
    Provider<InterB> classAPrototypeobj;

    public void doFromAbove() {
        InterB cls = (InterB) classAPrototypeobj.get();
        InterB cls1 = (InterB) classAPrototypeobj.get();
        cls.dododo();
        cls1.dododo();
        System.out.println(cls);
        System.out.println(cls1);

    }

    @Override
    public void run() {
        this.doFromAbove();
    }
}

ClassConfig.java

@Configuration
@ComponentScan
public class ClassConfig {
}

主要方法

public static void main(String[] args) {
    ClassC obj;
    try(AbstractApplicationContext appctx = new AnnotationConfigApplicationContext(ClassConfig.class)) {
        obj = (ClassC) appctx.getBean("classc");
    }
    Thread objThread = new Thread(obj);
    objThread.start();
}

更新的主要方法(仍然有相同的问题)

public static void main(String[] args) {
    try(AbstractApplicationContext appctx = new AnnotationConfigApplicationContext(ClassConfig.class)) {
        ClassC obj = (ClassC) appctx.getBean("classc");
        Thread objThread = new Thread(obj);
        objThread.start();
    }
}

执行时，这会导致bean‘环境’的NoSuchBeanDefinitionException

但是，当我们在Config类中定义以下内容时，错误就会消失而不会有任何跟踪。--这是解决办法(但是Spring应该自动注入环境，我们不应该这样做)，。不确定有多少这样的bean没有被注入/@Autowired

@Bean
public Environment environment(ApplicationContext context) {
    return context.getEnvironment();
}

我怀疑这是一个Spring框架错误..。不是吗？

StackTrace:

Exception in thread "Thread-1" org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'classA': Unsatisfied dependency expressed through field 'abcd'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'classB': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'environment' available
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:588)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1264)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:325)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory$DependencyObjectProvider.getObject(DefaultListableBeanFactory.java:1630)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory$Jsr330DependencyProvider.get(DefaultListableBeanFactory.java:1699)
    at tpt.verifypoc.ClassC.doFromAbove(ClassC.java:28)
    at tpt.verifypoc.ClassC.run(ClassC.java:39)
    at java.lang.Thread.run(Thread.java:745)
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'classB': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'environment' available
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:372)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1264)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:553)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1138)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:585)
    ... 14 more
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'environment' available
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.getBeanDefinition(DefaultListableBeanFactory.java:687)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getMergedLocalBeanDefinition(AbstractBeanFactory.java:1207)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:284)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:202)
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:208)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$ShortcutDependencyDescriptor.resolveShortcut(AutowiredAnnotationBeanPostProcessor.java:740)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1077)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1066)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.resolvedCachedArgument(AutowiredAnnotationBeanPostProcessor.java:548)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.access$200(AutowiredAnnotationBeanPostProcessor.java:117)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:577)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:366)
    ... 25 more

注：

1. 春季:4.3.9
2. JSR330: javax.inject版本1

Answer 1

我想说，在您开始使用关闭ApplicationContext的对象之前，这不是Spring中的一个bug。或者，实际上，使用资源进行尝试的块就是这样做的。

public static void main(String[] args) {
    ClassC obj;
    try(AbstractApplicationContext appctx = new AnnotationConfigApplicationContext(ClassConfig.class)) {
        obj = (ClassC) appctx.getBean("classc");
    }
    Thread objThread = new Thread(obj);
    objThread.start();
}

基本上和

public static void main(String[] args) {
    ClassC obj;
    AbstractApplicationContext appctx = new AnnotationConfigApplicationContext(ClassConfig.class)) {
        obj = (ClassC) appctx.getBean("classc");

    appctx.close();

    Thread objThread = new Thread(obj);
    objThread.start();
}

在使用对象之前，您正在关闭ApplicationContext。剩下的是一个ClassC实例，它有一个Provided<ClassB>的半支持代理，它需要上下文来查找某些bean。然而，它没有办法查找那些豆子，因为你从它下面的注册表。

当您关闭ApplicationContext时，您将关闭应用程序。我希望您仍然存在的对象现在是无效的，因为属于的容器被销毁了。

将代码与JDBC代码进行比较。您正在打开一个Connection，关闭连接，然后尝试在关闭的连接上准备一个语句。JDBC不允许这样做，因为Connection是关闭的，因此无效。

将它与Microsoft进行比较，您可以打开它，在工作表中工作，编写一个宏。关闭excel，并期望宏仍然运行。