SSM框架分页查询NullPointerException
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2024-03-14 19:58:23
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分页插件
<plugin>
<groupId>org.apache.tomcat.maven</groupId>
<artifactId>tomcat7-maven-plugin</artifactId>
<version>2.1</version>
<configuration>
<port>80</port>
<path>/</path>
<uriEncoding>utf-8</uriEncoding>
</configuration>
</plugin>
报错信息
Servlet.service() for servlet [DispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.NullPointerException] with root cause
java.lang.NullPointerException
解决方法
在getAll方法中输出list,控制台能得倒数据,但不能根据size来打印页面展示总条数,可能怀疑size的参数没有传进去
错误代码:
@GetMapping("/{page}/{size}")
public List<User> getAll(@PathVariable Integer page, Integer size) {
System.out.println(service);
List<User> list = service.getAll(page, size);
System.out.println(list);
return list;
}
@PathVariable 这个注解只对page添加,并没有对size添加
正确代码
@GetMapping("/{page}/{size}")
public List<User> getAll(@PathVariable Integer page, @PathVariable Integer size) {
System.out.println(service);
List<User> list = service.getAll(page, size);
System.out.println(list);
return list;
}