Spring中报"Could not resolve placeholder"的解决方案
2011-10-14 15:47
471 查看
除去properites文件路径错误、拼写错误外,出现"Could not resolve placeholder"很有可能是使用了多个PropertyPlaceholderConfigurer或者多个<context:property-placeholder>的原因。
比如我有一个dao.xml读取dbConnect.properties,还有一个dfs.xml读取dfsManager.properties,然后web.xml统一load这两个xml文件
Xml代码
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
WEB-INF/config/spring/dao.xml,
WEB-INF/config/spring/dfs.xml
</param-value>
</context-param>
如果这两个xml文件中分别有
Xml代码
<!-- dao.xml -->
<context:property-placeholder location="WEB-INF/config/db/dbConnect.properties" />
<!-- dfs.xml -->
<context:property-placeholder location="WEB-INF/config/dfs/dfsManager.properties" />
那么,一定会出"Could not resolve placeholder"。
一定要记住,不管是在一个Spring文件还是在多个Spring文件被统一load的情况下,直接写
Xml代码
<context:property-placeholder location="" />
<context:property-placeholder location="" />
是不允许的。
解决方案:
(1) 在Spring 3.0中,可以写:
Xml代码
<context:property-placeholder location="xxx.properties" ignore-unresolvable="true"
/>
<context:property-placeholder location="yyy.properties" ignore-unresolvable="true"
/>
注意两个都要加上ignore-unresolvable="true",一个加另一个不加也是不行的
(2) 在Spring 2.5中,<context:property-placeholder>没有ignore-unresolvable属性,此时可以改用PropertyPlaceholderConfigurer。其实<context:property-placeholder location="xxx.properties" ignore-unresolvable="true" />与下面的配置是等价的
Java代码
<bean id="随便" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="xxx.properties" />
<property name="ignoreUnresolvablePlaceholders" value="true" />
</bean>
正因为如此,写多个PropertyPlaceholderConfigurer不加ignoreUnresolvablePlaceholders属性也是一样会出"Could not resolve placeholder"。
虽然两者是的等价的,但估计大家还是喜欢写<context:property-placeholder>多一些,毕竟简单一些嘛。所以如果是Spring 3.0,直接用解决方案(1)再简单不过了;如果是Spring 2.5,需要费点力气改写成PropertyPlaceholderConfigurer
比如我有一个dao.xml读取dbConnect.properties,还有一个dfs.xml读取dfsManager.properties,然后web.xml统一load这两个xml文件
Xml代码
<context-param>
<param-name>contextConfigLocation</param-name>
<param-value>
WEB-INF/config/spring/dao.xml,
WEB-INF/config/spring/dfs.xml
</param-value>
</context-param>
如果这两个xml文件中分别有
Xml代码
<!-- dao.xml -->
<context:property-placeholder location="WEB-INF/config/db/dbConnect.properties" />
<!-- dfs.xml -->
<context:property-placeholder location="WEB-INF/config/dfs/dfsManager.properties" />
那么,一定会出"Could not resolve placeholder"。
一定要记住,不管是在一个Spring文件还是在多个Spring文件被统一load的情况下,直接写
Xml代码
<context:property-placeholder location="" />
<context:property-placeholder location="" />
是不允许的。
解决方案:
(1) 在Spring 3.0中,可以写:
Xml代码
<context:property-placeholder location="xxx.properties" ignore-unresolvable="true"
/>
<context:property-placeholder location="yyy.properties" ignore-unresolvable="true"
/>
注意两个都要加上ignore-unresolvable="true",一个加另一个不加也是不行的
(2) 在Spring 2.5中,<context:property-placeholder>没有ignore-unresolvable属性,此时可以改用PropertyPlaceholderConfigurer。其实<context:property-placeholder location="xxx.properties" ignore-unresolvable="true" />与下面的配置是等价的
Java代码
<bean id="随便" class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location" value="xxx.properties" />
<property name="ignoreUnresolvablePlaceholders" value="true" />
</bean>
正因为如此,写多个PropertyPlaceholderConfigurer不加ignoreUnresolvablePlaceholders属性也是一样会出"Could not resolve placeholder"。
虽然两者是的等价的,但估计大家还是喜欢写<context:property-placeholder>多一些,毕竟简单一些嘛。所以如果是Spring 3.0,直接用解决方案(1)再简单不过了;如果是Spring 2.5,需要费点力气改写成PropertyPlaceholderConfigurer
相关文章推荐
- Spring中报"Could not resolve placeholder"的解决方案
- Spring中报&quot;Could not resolve placeholder&quot;的解决方案
- "Could not resolve placeholder"解决方案
- Spring中报"Could not resolve placeholder"的解决方案
- Could not resolve placeholder 'redis.pool.maxTotal' in string value "${redis.pool.maxTotal}
- Could not resolve placeholder"的解决方案
- Could not resolve placeholder 'master.jdbc.url' in string value "${master.jdbc.url}"
- Could not resolve placeholder 'spring.security.mapping.directory' in string value "${spring.security
- "Could not resolve placeholder"解决方案
- "Could not resolve placeholder"解决方案
- Spring中报"Could not resolve placeholder"的解决方案
- Spring中报"Could not resolve placeholder"的解决方案
- Spring中报"Could not resolve placeholder"的解决方案
- Spring中报"Could not resolve placeholder"的解决方案
- spring cloud config---Could not resolve placeholder 'foo' in string value "${foo}"
- Spring中报"Could not resolve placeholder"的解决方案
- Could not resolve placeholder 解决方案
- 启动错误:Could not resolve placeholder 'spring.datasource.url' in value "${spring.datasource.url}"
- vs .net 2005 打开VSS项目时出现:"could not find the visual sourcesafe internet web service connection"的解决方案
- Could not resolve placeholder 解决方案