无法解析某些属性的占位符

Posted 2023-02-27

【中文标题】无法解析某些属性的占位符

【英文标题】：Could not resolve placeholder for some property

【发布时间】：2018-04-21 00:50:20

【问题描述】：

org.springframework.beans.factory.BeanCreationException: 错误 创建名称为 'dbDataSource' 的 bean cz.ita.javaee.config.DatabaseConfiguration：意外异常 在 bean 创建期间；嵌套异常是 java.lang.IllegalArgumentException：无法解析占位符 'db.jndi' 在值 "$db.jndi" 中 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:518) 在 org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:312) 在 org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:228) 在 org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:310) 在 org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200) 在 org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:756) 在 org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:868) 在 org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:549) 在 org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:409) 在 org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:291) 在 org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:103) 在 org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4743) 在 org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5207) 在 org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) 在 org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:752) 在 org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:728) 在 org.apache.catalina.core.StandardHost.addChild(StandardHost.java:734) 在 org.apache.catalina.startup.HostConfig.manageApp(HostConfig.java:1739) 在 sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 在 sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 在 sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 在 java.lang.reflect.Method.invoke(Method.java:498) 在 org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300) 在 com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) 在 com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) 在 org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:482) 在 org.apache.catalina.mbeans.MBeanFactory.createStandardContext(MBeanFactory.java:431) 在 sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 在 sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 在 sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 在 java.lang.reflect.Method.invoke(Method.java:498) 在 org.apache.tomcat.util.modeler.BaseModelMBean.invoke(BaseModelMBean.java:300) 在 com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.invoke(DefaultMBeanServerInterceptor.java:819) 在 com.sun.jmx.mbeanserver.JmxMBeanServer.invoke(JmxMBeanServer.java:801) 在 javax.management.remote.rmi.RMIConnectionImpl.doOperation(RMIConnectionImpl.java:1468) 在 javax.management.remote.rmi.RMIConnectionImpl.access$300(RMIConnectionImpl.java:76) 在 javax.management.remote.rmi.RMIConnectionImpl$PrivilegedOperation.run(RMIConnectionImpl.java:1309) 在 javax.management.remote.rmi.RMIConnectionImpl.doPrivilegedOperation(RMIConnectionImpl.java:1401) 在 javax.management.remote.rmi.RMIConnectionImpl.invoke(RMIConnectionImpl.java:829) 在 sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) 在 sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) 在 sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) 在 java.lang.reflect.Method.invoke(Method.java:498) 在 sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:357) 在 sun.rmi.transport.Transport$1.run(Transport.java:200) 在 sun.rmi.transport.Transport$1.run(Transport.java:197) 在 java.security.AccessController.doPrivileged(Native Method) 在 sun.rmi.transport.Transport.serviceCall(Transport.java:196) 在 sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:568) 在 sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:826) 在 sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.lambda$run$0(TCPTransport.java:683) 在 java.security.AccessController.doPrivileged(Native Method) 在 sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:682) 在 java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) 在 java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) 在 java.lang.Thread.run(Thread.java:748) 引起： java.lang.IllegalArgumentException：无法解析占位符 'db.jndi' 在值 "$db.jndi" 中 org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:172) 在 org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:124) 在 org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:237) 在 org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:211) 在 org.springframework.context.support.PropertySourcesPlaceholderConfigurer.lambda$processProperties$0(PropertySourcesPlaceholderConfigurer.java:175) 在 org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:834) 在 org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1081) 在 org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1060) 在 org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:809) 在 org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:715) 在 org.springframework.beans.factory.support.ConstructorResolver.instantiateUsingFactoryMethod(ConstructorResolver.java:458) 在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.instantiateUsingFactoryMethod(AbstractAutowireCapableBeanFactory.java:1249) 在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1098) 在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:545) 在 org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:502) ... 55 更多

我的数据库配置类：

@EnableTransactionManagement
public class DatabaseConfiguration 

    @Bean(name = "dbDataSource")
    @Profile("!development")
    public DataSource dataSource(@Value("$db.jndi") String dbJndiName) 
        JndiDataSourceLookup lookup = new JndiDataSourceLookup();
        return lookup.getDataSource(dbJndiName);
    

    @Profile("development")
    public DataSource dataSource(@Value("$development.db.driver") String dbDriver,
            @Value("$development.db.url") String dbUrl,
            @Value("$development.db.username") String dbUsername,
            @Value("$development.db.password") String dbPassword) 
        DriverManagerDataSource driverManagerDataSource = new DriverManagerDataSource(dbUrl);
        driverManagerDataSource.setDriverClassName(dbDriver);
        driverManagerDataSource.setUsername(dbUsername);
        driverManagerDataSource.setPassword(dbPassword);
        return driverManagerDataSource;
    

和 AppConfig：

@Import(DatabaseConfiguration.class, MailSenderConfiguration.class)
public class AppConfig 
@Bean
public PropertyPlaceholderConfigurer propertyPlaceholderConfigurer() 
    PropertyPlaceholderConfigurer propertyPlaceholderConfigurer = new PropertyPlaceholderConfigurer();
    propertyPlaceholderConfigurer.setLocation(new ClassPathResource("application.properties"));
    propertyPlaceholderConfigurer.setIgnoreUnresolvablePlaceholders(true);
    return propertyPlaceholderConfigurer;

您好，我遇到了上面的错误，我不知道如何解决，您能帮我吗？在添加此 bean 之前，我的项目运行良好：

@PropertySource("classpath:mail.properties")
public class MailSenderConfiguration 

@Value("$mail.smtp.host")
private String mailHost;

@Value("$mail.smtp.port")
private int mailPort;

@Value("$mail.username")
private String mailUsername;

@Value("$mail.password")
private String mailPassword;

@Value("$mail.protocol")
private String mailProtocol;

@Value("$mail.smtp.auth")
private boolean mailAuth;

@Value("$mail.smtp.starttls.enable")
private String mailEnableTls;

@Value("$mail.smtp.debug")
private boolean mailDebug;

@Bean
public JavaMailSender getMailSender() 
    JavaMailSenderImpl mailSender = new JavaMailSenderImpl();

    mailSender.setHost(mailHost);
    mailSender.setPort(mailPort);
    mailSender.setUsername(mailUsername);
    mailSender.setPassword(mailPassword);

    Properties mailProperties = new Properties();
    mailProperties.put("mail.transport.protocol", mailProtocol);
    mailProperties.put("mail.smtp.auth", mailAuth);
    mailProperties.put("mail.smtp.starttls.enable", mailEnableTls);
    mailProperties.put("mail.smtp.debug", mailDebug);
    mailSender.setJavaMailProperties(mailProperties);

    return mailSender;


@Bean
public PropertyPlaceholderConfigurer propertyPlaceholderConfigurer() 
    PropertyPlaceholderConfigurer propertyPlaceholderConfigurer = new PropertyPlaceholderConfigurer();
    propertyPlaceholderConfigurer.setLocation(new ClassPathResource("mail.properties"));
    propertyPlaceholderConfigurer.setIgnoreUnresolvablePlaceholders(true);
    return propertyPlaceholderConfigurer;

【参考方案1】：

看起来您在 MailSenderConfiguration 中的属性源配置覆盖了 AppConfig 中的配置。

您可以从 MailSenderConfiguration 中删除 PropertyPlaceholderConfigurer bean，并在 AppConfig 中为“mail.properties”设置其他位置（使用 setLocations() 方法而不是 setLocation()）：

@Import(DatabaseConfiguration.class, MailSenderConfiguration.class)
public class AppConfig 
@Bean
public PropertyPlaceholderConfigurer propertyPlaceholderConfigurer() 
    PropertyPlaceholderConfigurer propertyPlaceholderConfigurer = new PropertyPlaceholderConfigurer();
    propertyPlaceholderConfigurer.setLocations(new ClassPathResource("application.properties"), new ClassPathResource("mail.properties"));
    propertyPlaceholderConfigurer.setIgnoreUnresolvablePlaceholders(true);
    return propertyPlaceholderConfigurer;

【参考方案2】：

在尝试通过将 bean 设为静态来评估属性之前，您应该确保已加载 PropertyPlaceholderConfigurer bean。 Spring 在其他 bean 定义之前实例化静态 bean。

@Import(DatabaseConfiguration.class, MailSenderConfiguration.class)
public class AppConfig 
@Bean
public static PropertyPlaceholderConfigurer propertyPlaceholderConfigurer() 
    PropertyPlaceholderConfigurer propertyPlaceholderConfigurer = new PropertyPlaceholderConfigurer();
    propertyPlaceholderConfigurer.setLocation(new ClassPathResource("application.properties"));
    propertyPlaceholderConfigurer.setIgnoreUnresolvablePlaceholders(true);
    return propertyPlaceholderConfigurer;