liubao created SCB-2422:
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Summary: bean注入代码修改为constructor injection
Key: SCB-2422
URL: https://issues.apache.org/jira/browse/SCB-2422
Project: Apache ServiceComb
Issue Type: Improvement
Components: Java-Chassis
Reporter: liubao
Fix For: java-chassis-2.7.0
尽量避免使用field injection，对于必须依赖，使用 constructor-based injection，对于可选依赖，使用
setter-based injection。这里对直接的好处是
a. 避免循环依赖（强制校验，不要依赖spring三级缓存），我记得之前cse是出现过重构发现大量循环依赖的问题的
b. 避免依赖为null的场景
ref: [https://blog.marcnuri.com/field-injection-is-not-recommended]
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