春天忽略资源不发现不工作答案

【问题标题】：spring ignoreResourceNotFound is not working春天忽略资源不发现不工作
【发布时间】：2017-12-07 10:38:31
【问题描述】：

我已经配置了如下属性文件

<bean id="applicationHostProperties"
        class="org.springframework.beans.factory.config.PropertiesFactoryBean">
        <property name="ignoreResourceNotFound" value="true"></property>
        <property name="locations">
            <list>
                <value>classpath:applicationHost.properties</value>
            </list>
        </property>
</bean>

我正在从我的 spring bean 中注入属性文件

@Value("#{appsDeployedProperties}")
private Properties appsDeployedProperties;

由于我设置了 ignoreResourceNotFound=true，因此如果找不到属性文件，我预计不会出现任何错误。

但是如果缺少属性文件，我的 spring 上下文初始化会失败。我在这里做错了吗？感谢您的帮助。

错误堆栈跟踪：

> Error creating bean with name 'instanceConfigurati
>     on': Unsatisfied dependency expressed through field 'appsDeployedProperties': Ex
>     pression parsing failed; nested exception is org.springframework.expression.spel
>     .SpelEvaluationException: EL1008E:(pos 0): Property or field 'appsDeployedProper
>     ties' cannot be found on object of type 'org.springframework.beans.factory.confi
>     g.BeanExpressionContext' - maybe not public?; nested exception is org.springfram
>     ework.beans.factory.BeanExpressionException: Expression parsing failed; nested e
>     xception is org.springframework.expression.spel.SpelEvaluationException: EL1008E
>     :(pos 0): Property or field 'appsDeployedProperties' cannot be found on object o
>     f type 'org.springframework.beans.factory.config.BeanExpressionContext' -
> maybe
>     not public?; nested exception is org.springframework.beans.factory.UnsatisfiedDe
>     pendencyException: Error creating bean with name 'instanceConfiguration': Unsati
>     sfied dependency expressed through field 'appsDeployedProperties': Expression pa
>     rsing failed; nested exception is org.springframework.expression.spel.SpelEvalua
>     tionException: EL1008E:(pos 0): Property or field 'appsDeployedProperties' canno
>     t be found on object of type 'org.springframework.beans.factory.config.BeanExpre
>     ssionContext' - maybe not public?; nested exception is org.springframework.beans
>     .factory.BeanExpressionException: Expression parsing failed; nested exception is
>      org.springframework.expression.spel.SpelEvaluationException: EL1008E:(pos 0): P
>     roperty or field 'appsDeployedProperties' cannot be found on object of type 'org
>     .springframework.beans.factory.config.BeanExpressionContext' - maybe not public?at
> org.springframework.beans.factory.annotation.AutowiredAnnotationBeanP
>     ostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.j
>     ava:569) ~[spring-beans-4.3.2.RELEASE.jar!/:4.3.2.RELEASE]
>             at org.springframework.beans.factory.annotation.InjectionMetadata.inject
>     (InjectionMetadata.java:88) ~[spring-beans-4.3.2.RELEASE.jar!/:4.3.2.RELEASE]
>             at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanP
>     ostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java
>     :349) ~[spring-beans-4.3.2.RELEASE.jar!/:4.3.2.RELEASE]

【问题讨论】：

请添加堆栈跟踪
添加了错误堆栈跟踪
能否请您重新格式化堆栈跟踪，这种形式不可读

标签： java spring spring-mvc properties-file

【解决方案1】：

您必须将来自applicationHost.properties 的键绑定为String 而不是Properties。比如你在applicationHost.properties中有keyappsDeployedProperties，如下：

applicationHost.properties

appsDeployedProperties=hello

在 Spring Bean 中，你必须使用 as String，例如：

@Value("#{appsDeployedProperties}")
private String appsDeployedProperties;

P.S：你可以添加ignoreUnresolvablePlaceholders键，值为true，告诉Spring忽略任何属性文件中未提及的bean中使用的键，如下：

<bean id="applicationHostProperties"
        class="org.springframework.beans.factory.config.PropertiesFactoryBean">
        <property name="ignoreResourceNotFound" value="true"></property>
        <property name="ignoreUnresolvablePlaceholders" value="true"/>
        <property name="locations">
            <list>
                <value>classpath:applicationHost.properties</value>
            </list>
        </property>
</bean>

【讨论】：