Eclipse网页报错

总结：

导包错误
缺失jar包
名称拼写错误（编译器找不到相关变量/方法/…)

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The type List is not generic; it cannot be parameterized with arguments ¹

导包错误
import java.util.List;

Property ‘driverClassName’ threw exception; nested exception is java.lang.IllegalStateException: Could not load JDBC driver class [com.mysql.jdbc.Driver]

缺失mysql-connector-java-5.1.12-bin.jar

setter依赖注入未实例化

setter方法书写错误
配置文件中相关代码的ref参数错误

Duplicate modifier for the method XXXX in type XXXX

标识符重复
可能是输入了两个public…

java.lang.StringBuffer.append(java.lang.String)’ on a null object reference²

空指针异常，
null等空数据在转为toString的时候，经常会报错。³
必须：StringBuffer s = new StringBuffer();

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1. 解决错误The type List is not generic; it cannot be parameterized with arguments ↩︎

2. StringBuffer调用append时的空指针异常的不留意的地方 ↩︎

3. Attempt to invoke virtual method ‘java.lang.String java.lang.Object.toString()’ on a null object ↩︎