错误:docker容器: java.lang.IllegalArgumentException:未能解析值"${CASSANDRA_HOST}“中的占位符'CASSANDRA_HOST‘
错误:docker容器: java.lang.IllegalArgumentException:未能解析值"${CASSANDRA_HOST}“中的占位符'CASSANDRA_HOST‘
提问于 2021-11-09 15:25:18
我在docker容器中运行一个spring引导应用程序，它将另一个Cassandra的容器与一个码头网络(驱动器桥)连接起来。问题是，我使用一个名为CASSANDRA_HOST的环境变量linux来保存Cassandra的容器IP和spring引导could not resolve placeholder 'CASSANDRA_HOST' in value "${CASSANDRA_HOST}"。
环境变量是在Spring容器中创建的。我测试了其他的环境变量，有些工作了，而其他的则不起作用。所以，我不明白哪里有错误。
错误：
Caused by: java.lang.IllegalArgumentException: Could not resolve placeholder 'CASSANDRA_HOST' in value "${CASSANDRA_HOST}"
at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:178)
at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:124)
at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:239)
at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:210)
at org.springframework.core.env.AbstractPropertyResolver.resolveNestedPlaceholders(AbstractPropertyResolver.java:230)
at org.springframework.core.env.PropertySourcesPropertyResolver.getProperty(PropertySourcesPropertyResolver.java:88)
at org.springframework.core.env.PropertySourcesPropertyResolver.getProperty(PropertySourcesPropertyResolver.java:62)
at org.springframework.core.env.AbstractEnvironment.getProperty(AbstractEnvironment.java:535)
at org.springframework.context.support.PropertySourcesPlaceholderConfigurer$1.getProperty(PropertySourcesPlaceholderConfigurer.java:137)
at org.springframework.context.support.PropertySourcesPlaceholderConfigurer$1.getProperty(PropertySourcesPlaceholderConfigurer.java:133)
at org.springframework.core.env.PropertySourcesPropertyResolver.getProperty(PropertySourcesPropertyResolver.java:85)
at org.springframework.core.env.PropertySourcesPropertyResolver.getPropertyAsRawString(PropertySourcesPropertyResolver.java:74)
at org.springframework.util.PropertyPlaceholderHelper.parseStringValue(PropertyPlaceholderHelper.java:151)
at org.springframework.util.PropertyPlaceholderHelper.replacePlaceholders(PropertyPlaceholderHelper.java:124)
at org.springframework.core.env.AbstractPropertyResolver.doResolvePlaceholders(AbstractPropertyResolver.java:239)
at org.springframework.core.env.AbstractPropertyResolver.resolveRequiredPlaceholders(AbstractPropertyResolver.java:210)
at org.springframework.context.support.PropertySourcesPlaceholderConfigurer.lambda$processProperties$0(PropertySourcesPlaceholderConfigurer.java:175)
at org.springframework.beans.factory.support.AbstractBeanFactory.resolveEmbeddedValue(AbstractBeanFactory.java:936)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1321)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1300)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640)
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119)
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399)
... 59 more在application.properties，中，我将变量设置如下：
cassandra.contactpoints= ${CASSANDRA_HOST}在类CassandraCoonfig，中，我将@值设置为读取IP：
@Configuration
public class CassandraConfig extends AbstractCassandraConfiguration {
@Value("${cassandra.contactpoints}")
private String contactPoints;在POM.XML中，我使用的是标记< filtering >
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>编辑：--这是spring容器中所有环境变量的打印。CASSANDRA_HOST在第14行。
回答 2
Stack Overflow用户
回答已采纳
发布于 2021-11-23 13:48:04
我用下面的命令解决了这个问题，在docker-compose.yml中构建了一座桥：
networks:
net:
driver: "bridge"这是完整的docker-compose.yml
version: '3'
services:
... (your code)
networks:
- net
networks:
net:
driver: "bridge"在码头映像中的这个网络中，在容器中，您检查这个网络，您将找到您需要的IP。然后用这个IP设置环境变量。
这在我的设想中解决了。
Stack Overflow用户
发布于 2022-07-26 05:12:20
我的解决办法是
@Bean
public static PropertySourcesPlaceholderConfigurer placeholderConfigurer() {
PropertySourcesPlaceholderConfigurer placeholderConfigurer = new PropertySourcesPlaceholderConfigurer();
placeholderConfigurer.setIgnoreUnresolvablePlaceholders(true);
return placeholderConfigurer;
}设置是否忽略不可解析的占位符。默认值为"false"：如果占位符无法解析，将引发异常。将此标志切换为"true“，以保留占位符字符串在这种情况下的状态，将其留给其他占位符配置器来解决。
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原文链接：
https://stackoverflow.com/questions/69900773
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