《后端》报错：People.hbm.xml这个映射找不到和空指针异常--2021-01-12

com/bella/entity/People.hbm.xml这个映射找不到

代码没写错，但是报错如下：

Exception in thread "main" org.hibernate.MappingNotFoundException: resource: com/bella/entity/People.hbm.xml not found
	at org.hibernate.cfg.Configuration.addResource(Configuration.java:731)
	at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:2125)
	at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:2097)
	at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2077)
	at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2030)
	at org.hibernate.cfg.Configuration.configure(Configuration.java:1945)
	at org.hibernate.cfg.Configuration.configure(Configuration.java:1924)
	at test.test.main(test.java:11)

意思是com/bella/entity/People.hbm.xml这个映射找不到。

原因：有两种，一是代码写错，而是位置问题导致找不到。

idea工程中，在java文件中读不到想xml文件。

解决：在pom文件中添加设置，使其能在java中读到xml文件。

   <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                        <include>**/*.xml</include>
                    </includes>
            </resource>
        </resources>
    </build>

 

空指针异常：NullPointerException