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### Error querying database. Cause: java.lang.IndexOutOfBoundsException: Index:
5, Size: 5 ### The error may exist in file [E:\code\security-
url\target\classes\mapper\UserMapper.xml] ### The error may involve cn.zhao.url.
mapper.UserMapper.getUserByUsername ### The error occurred while handling
results ### SQL: select * from user where username = ?; ### Cause: java.lang.
IndexOutOfBoundsException: Index: 5, Size: 5 at org.apache.ibatis.exceptions.
ExceptionFactory.wrapException(ExceptionFactory.java:30) ~[mybatis-3.5.5.jar:3.5
.5] at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(
DefaultSqlSession.java:149) ~[mybatis-3.5.5.jar:3.5.5] at org.apache.ibatis.
session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:140) ~[
mybatis-3.5.5.jar:3.5.5] at org.apache.ibatis.session.defaults.DefaultSqlSession
.selectOne(DefaultSqlSession.java:76) ~[mybatis-3.5.5.jar:3.5.5] at sun.reflect.
NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_202] at sun.reflect.
NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_202
] at sun.reflect.DelegatingMethodAccessorImpl.invoke(
DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_202] at java.lang.reflect.
Method.invoke(Method.java:498) ~[na:1.8.0_202] at org.mybatis.spring.
SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:426) ~[
mybatis-spring-2.0.5.jar:2.0.5] ... 62 common frames omitted Caused by: java.
lang.IndexOutOfBoundsException: Index: 5, Size: 5 at java.util.ArrayList.
rangeCheck(ArrayList.java:657) ~[na:1.8.0_202] at java.util.ArrayList.get(
ArrayList.java:433) ~[na:1.8.0_202] at org.apache.ibatis.executor.resultset.
DefaultResultSetHandler.createUsingConstructor(DefaultResultSetHandler.java:708)
~[mybatis-3.5.5.jar:3.5.5] at org.apache.ibatis.executor.resultset.
DefaultResultSetHandler.createByConstructorSignature(DefaultResultSetHandler.
java:693) ~[mybatis-3.5.5.jar:3.5.5] at org.apache.ibatis.executor.resultset.
DefaultResultSetHandler.createResultObject(DefaultResultSetHandler.java:657) ~[
mybatis-3.5.5.jar:3.5.5] at org.apache.ibatis.executor.resultset.
DefaultResultSetHandler.createResultObject(DefaultResultSetHandler.java:630) ~[
mybatis-3.5.5.jar:3.5.5] at org.apache.ibatis.executor.resultset.
DefaultResultSetHandler.getRowValue(DefaultResultSetHandler.java:397) ~[mybatis-
3.5.5.jar:3.5.5] at org.apache.ibatis.executor.resultset.DefaultResultSetHandler
.handleRowValuesForSimpleResultMap(DefaultResultSetHandler.java:354) ~[mybatis-
3.5.5.jar:3.5.5] at org.apache.ibatis.executor.resultset.DefaultResultSetHandler
.handleRowValues(DefaultResultSetHandler.java:328) ~[mybatis-3.5.5.jar:3.5.5] at
org.apache.ibatis.executor.resultset.DefaultResultSetHandler.handleResultSet(
DefaultResultSetHandler.java:301) ~[mybatis-3.5.5.jar:3.5.5] at org.apache.
ibatis.executor.resultset.DefaultResultSetHandler.handleResultSets(
DefaultResultSetHandler.java:194) ~[mybatis-3.5.5.jar:3.5.5] at org.apache.
ibatis.executor.statement.PreparedStatementHandler.query(
PreparedStatementHandler.java:65) ~[mybatis-3.5.5.jar:3.5.5] at org.apache.
ibatis.executor.statement.RoutingStatementHandler.query(RoutingStatementHandler.
java:79) ~[mybatis-3.5.5.jar:3.5.5] at org.apache.ibatis.executor.SimpleExecutor
.doQuery(SimpleExecutor.java:63) ~[mybatis-3.5.5.jar:3.5.5] at org.apache.ibatis
.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:325) ~[mybatis-3.5.5.
jar:3.5.5] at org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:
156) ~[mybatis-3.5.5.jar:3.5.5] at org.apache.ibatis.executor.CachingExecutor.
query(CachingExecutor.java:109) ~[mybatis-3.5.5.jar:3.5.5] at org.apache.ibatis.
executor.CachingExecutor.query(CachingExecutor.java:89) ~[mybatis-3.5.5.jar:3.5
.5] at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(
DefaultSqlSession.java:147) ~[mybatis-3.5.5.jar:3.5.5] ... 69 common frames
omitted
出现上面问题，首先是检查检查mybatis映射的实体类的无参构造写没，出现这种情况一般是无参构造没写，导致mybatis无法对实体类赋值