Spring运行可执行jar时的循环占位符引用

Question

尝试运行可执行jar文件时,我正面临"循环占位符引用"异常.这是详细的例外.

org.springframework.beans.factory.BeanDefinitionStoreException: Invalid bean definition with name 'postProcessProperties' defined in class path resource [applicationContext.xml]: Circular placeholder reference 'processor.core.poolsize' in property definitions
     [echo]     at org.springframework.beans.factory.config.PropertyPlaceholderConfigurer.processProperties(PropertyPlaceholderConfigurer.java:287)
     [echo]     at org.springframework.beans.factory.config.PropertyResourceConfigurer.postProcessBeanFactory(PropertyResourceConfigurer.java:75)
     [echo]     at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:663)
     [echo]     at org.springframework.context.support.AbstractApplicationContext.invokeBeanFactoryPostProcessors(AbstractApplicationContext.java:638)
     [echo]     at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:407)
     [echo]     at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:139)
     [echo]     at org.springframework.context.support.ClassPathXmlApplicationContext.(ClassPathXmlApplicationContext.java:83)
     [echo]     at com.autodesk.postprocess.engine.PostProcessEngine.start(PostProcessEngine.java:39)
     [echo]     at com.autodesk.postprocess.engine.PostProcessEngine.main(PostProcessEngine.java:29)

这是一个spring应用程序,它使用外部属性文件在启动时读取值.这是春天的定义.到目前为止,这种方法运作良好.

<bean id="propertyConfig"
        class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
        <property name="systemPropertiesModeName" value="SYSTEM_PROPERTIES_MODE_NEVER" />
        <property name="ignoreResourceNotFound" value="true" />
        <property name="locations">
            <list>
                <value>classpath:/postprocess.properties</value>
            </list>
        </property>
        <property name="properties">
            <props>
                <prop key="processor.core.poolsize">${processor.core.poolsize}</prop>
                <prop key="processor.max.poolsize">${processor.max.poolsize}</prop>
            </props>
        </property>
    </bean>

    <bean id="postProcessProperties"
        class="org.springframework.beans.factory.config.PropertiesFactoryBean">
        <property name="properties">
            <props>
                <prop key="processor.core.poolsize">${processor.core.poolsize}</prop>
                <prop key="processor.max.poolsize">${processor.max.poolsize}</prop>
                <prop key="processor.polling.delay">${processor.polling.delay}</prop>
                <prop key="processor.polling.period">${processor.polling.period}</prop>
        </property>
    </bean>

我正在使用shade插件来生成jar文件.这是一个片段

<plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>1.7.1</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
                            <transformers>
                                <transformer
                                    implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                    <mainClass>com.test.postprocess.engine.PostProcessEngine</mainClass>
                                </transformer>
                                <transformer
                                    implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                    <resource>META-INF/spring.handlers</resource>
                                </transformer>
                                <transformer
                                    implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                    <resource>META-INF/spring.schemas</resource>
                                </transformer>
                            </transformers>
                            <filters>
                                <filter>
                                    <artifact>:</artifact>
                                    <excludes>
                                        <exclude>META-INF/.SF</exclude>
                                        <exclude>META-INF/.DSA</exclude>
                                        <exclude>META-INF/*.RSA</exclude>
                                    </excludes>
                                </filter>
                            </filters>
                        </configuration>
                    </execution>
                </executions>
            </plugin>

我不确定是什么导致了这个问题,因为我之前在其他可执行jar文件中使用了类似的模式.

任何指针将不胜感激.

谢谢

Answer 1

它可能很晚才回答这个问题,但为了面对类似问题的人的利益而加入它.

我能够通过更改密钥名称来修复它.例如

 <prop key="processor.core.poolsize">${processor.core.poolsize}</prop>
 <prop key="processor.max.poolsize">${processor.max.poolsize}</prop>

改成了类似的东西

<prop key="processor.core.poolsize">${core.poolsize}</prop>
<prop key="processor.max.poolsize">${max.poolsize}</prop>

property-placeholder键和要过滤的属性值的键不能相同.

Answer 2

Circular placeholder reference XXXX in property definitions

spring-framework当您的属性键名称和值变量名称完全相同时，将抛出上述类型的异常。

确保您的财产不应该看起来像 key={$key}. 为键和值保留不同的名称将解决此问题。

Answer 3

它可能无法找到资源 - postprocess.properties。你能删除这一行吗 -

<property name="ignoreResourceNotFound" value="true" />

然后，如果未找到资源，则应显示适当的消息。