实战介绍 学习完Java8的Stream方法,可能你正准备大展身手,却发现遇到不少问题,本篇文章为大家带来一个findAny方法抛出java.lang.NullPointerException的场景. 实战内容 先看一下下面的代码,猜测一下执行之后会打印什么? public class FindAnyTest { @Test public void test() { List<Foo> list = new ArrayList<>(); list.add(new Foo()); /
oracle-function-into时为null报错 create or replace function P_ADD_CUSTOMER_FOR_CSS_heyt_test(i_cust_name in varchar2, i_en_name in varchar2, i_cust_sex in varchar2, i_cust_birthday in date, i_cust_id_type in varchar2, i_cust_id_no in varchar2, i_data_qua
出现问题的原因: 内存用户验证时,Spring boot 2.0.1引用的security 依赖是 spring security 5.X版本,此版本需要提供一个PasswordEncorder的实例,否则后台汇报错误: java.lang.IllegalArgumentException: There is no PasswordEncoder mapped for the id "null" 并且页面毫无响应. 解决方法: 创建PasswordEncorder的实现类MyPassw
(1/1) Error Call to a member function connection() on nullin Model.php line 1201at Model::resolveConnection(null)in Model.php line 1167at Model->getConnection()in Model.php line 997at Model->newBaseQueryBuilder()in Model.php line 912at Model->new
1.对于执行中的报错,可以在db2命令行下运行命令 : db2=>? SQLxxx 查看对应的报错原因及解决方法. 2.错误SQL0206N SQLSTATE=42703 检测到一个未定义的列.属性或参数名. SQL0206N "SQL_COU_ALL" is not valid in the context where it is used. SQLSTATE=42703 db2 => ? "42703" db2 =
1.对于执行中的报错,可以在db2命令行下运行命令 : db2=>? SQLxxx 查看对应的报错原因及解决方法. 2.错误SQL0206N SQLSTATE=42703 检测到一个未定义的列.属性或参数名. SQL0206N "SQL_COU_ALL" is not valid in the context where it is used. SQLSTATE=42703 db2 => ? "42703" db2 =
正确写法: @Override @SuppressWarnings("unchecked") public List<Device> queryOSDevice(String cpu){ String sql = null; if(cpu.equals("os_xp")){ sql = "from "+this.clazz.getName()+" this WHERE this.os.id = (select id from
问题描述: storm版本:1.2.2,kafka版本:2.11. 在使用storm去消费kafka中的数据时,发生了如下错误. [root@node01 jars]# /opt/storm-1.2.2/bin/storm jar MyProject-1.0-SNAPSHOT-jar-with-dependencies.jar com.suhaha.storm.storm122_kafka211_demo02.KafkaTopoDemo stormkafka SLF4J: Class pat