Searched on Google with the first line of a JAVA stack trace?

We can recommend more relevant solutions and speed up debugging when you paste your entire stack trace with the exception message. Try a sample exception.

Recommended solutions based on your search

Solutions on the web

via segmentfault.com by Unknown author, 1 year ago
java.lang.NullPointerException: null	at com.alibaba.druid.pool.vendor.MySqlValidConnectionChecker.(MySqlValidConnectionChecker.java:50)	at com.alibaba.druid.pool.DruidDataSource.initValidConnectionChecker(DruidDataSource.java:944)	at com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:659)	at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:986)	at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:982)	at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:102)	at com.github.pagehelper.PageHelper.getUrl(PageHelper.java:281)	at com.github.pagehelper.PageHelper.getSqlUtil(PageHelper.java:305)	at com.github.pagehelper.PageHelper.initSqlUtil(PageHelper.java:263)	at com.github.pagehelper.PageHelper.intercept(PageHelper.java:250)	at org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)	at com.sun.proxy.$Proxy69.query(Unknown Source)	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:120)	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:113)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:386)	at com.sun.proxy.$Proxy41.selectList(Unknown Source)	at org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:205)	at org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:122)	at org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:64)	at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53)	at com.sun.proxy.$Proxy54.selectAll(Unknown Source)	at me.carambola.blog.Application.run(Application.java:33)	at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:806)	at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:790)	at org.springframework.boot.SpringApplication.afterRefresh(SpringApplication.java:777)	at org.springframework.boot.SpringApplication.run(SpringApplication.java:308)	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1191)	at org.springframework.boot.SpringApplication.run(SpringApplication.java:1180)	at me.carambola.blog.Application.main(Application.java:27)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:498)	at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)