java.lang.NullPointerException: null

segmentfault.com | 1 month ago
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    java - springboot集成mybaits,druid报错 - SegmentFault

    segmentfault.com | 1 month ago
    java.lang.NullPointerException: null
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    HQL Exception (org.hibernate.dialect.Dialect$3)

    Stack Overflow | 4 years ago | Hari
    java.lang.NullPointerException: null
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    Error loading model properties in JPA on play 2.0.3

    Stack Overflow | 4 years ago | Chappies
    java.lang.NullPointerException: null
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    Why lift can't find my "db.properties"

    Stack Overflow | 5 years ago | Freewind
    java.lang.NullPointerException: null

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    Root Cause Analysis

    1. java.lang.NullPointerException

      null

      at com.alibaba.druid.pool.vendor.MySqlValidConnectionChecker.<init>()
    2. druid
      DruidDataSource.getConnection
      1. com.alibaba.druid.pool.vendor.MySqlValidConnectionChecker.<init>(MySqlValidConnectionChecker.java:50)[druid-1.0.18.jar:1.0.18]
      2. com.alibaba.druid.pool.DruidDataSource.initValidConnectionChecker(DruidDataSource.java:944)[druid-1.0.18.jar:1.0.18]
      3. com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:659)[druid-1.0.18.jar:1.0.18]
      4. com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:986)[druid-1.0.18.jar:1.0.18]
      5. com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:982)[druid-1.0.18.jar:1.0.18]
      6. com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:102)[druid-1.0.18.jar:1.0.18]
      6 frames
    3. com.github.pagehelper
      PageHelper.intercept
      1. com.github.pagehelper.PageHelper.getUrl(PageHelper.java:281)[pagehelper-4.1.1.jar:na]
      2. com.github.pagehelper.PageHelper.getSqlUtil(PageHelper.java:305)[pagehelper-4.1.1.jar:na]
      3. com.github.pagehelper.PageHelper.initSqlUtil(PageHelper.java:263)[pagehelper-4.1.1.jar:na]
      4. com.github.pagehelper.PageHelper.intercept(PageHelper.java:250)[pagehelper-4.1.1.jar:na]
      4 frames
    4. MyBatis
      Plugin.invoke
      1. org.apache.ibatis.plugin.Plugin.invoke(Plugin.java:61)[mybatis-3.3.0.jar:3.3.0]
      1 frame
    5. com.sun.proxy
      $Proxy69.query
      1. com.sun.proxy.$Proxy69.query(Unknown Source)[na:na]
      1 frame
    6. MyBatis
      DefaultSqlSession.selectList
      1. org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:120)[mybatis-3.3.0.jar:3.3.0]
      2. org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:113)[mybatis-3.3.0.jar:3.3.0]
      2 frames
    7. Java RT
      Method.invoke
      1. sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[na:1.8.0_91]
      2. sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)[na:1.8.0_91]
      3. sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[na:1.8.0_91]
      4. java.lang.reflect.Method.invoke(Method.java:498)[na:1.8.0_91]
      4 frames
    8. MyBatis-Spring
      SqlSessionTemplate$SqlSessionInterceptor.invoke
      1. org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:386)[mybatis-spring-1.2.3.jar:1.2.3]
      1 frame
    9. com.sun.proxy
      $Proxy41.selectList
      1. com.sun.proxy.$Proxy41.selectList(Unknown Source)[na:na]
      1 frame
    10. MyBatis-Spring
      SqlSessionTemplate.selectList
      1. org.mybatis.spring.SqlSessionTemplate.selectList(SqlSessionTemplate.java:205)[mybatis-spring-1.2.3.jar:1.2.3]
      1 frame
    11. MyBatis
      MapperProxy.invoke
      1. org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:122)[mybatis-3.3.0.jar:3.3.0]
      2. org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:64)[mybatis-3.3.0.jar:3.3.0]
      3. org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:53)[mybatis-3.3.0.jar:3.3.0]
      3 frames
    12. com.sun.proxy
      $Proxy54.selectAll
      1. com.sun.proxy.$Proxy54.selectAll(Unknown Source)[na:na]
      1 frame
    13. me.carambola.blog
      Application.run
      1. me.carambola.blog.Application.run(Application.java:33)[main/:na]
      1 frame
    14. Spring Boot
      SpringApplication.run
      1. org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:806)[spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
      2. org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:790)[spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
      3. org.springframework.boot.SpringApplication.afterRefresh(SpringApplication.java:777)[spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
      4. org.springframework.boot.SpringApplication.run(SpringApplication.java:308)[spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
      5. org.springframework.boot.SpringApplication.run(SpringApplication.java:1191)[spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
      6. org.springframework.boot.SpringApplication.run(SpringApplication.java:1180)[spring-boot-1.3.5.RELEASE.jar:1.3.5.RELEASE]
      6 frames
    15. me.carambola.blog
      Application.main
      1. me.carambola.blog.Application.main(Application.java:27)[main/:na]
      1 frame
    16. Java RT
      Method.invoke
      1. sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)[na:1.8.0_91]
      2. sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)[na:1.8.0_91]
      3. sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)[na:1.8.0_91]
      4. java.lang.reflect.Method.invoke(Method.java:498)[na:1.8.0_91]
      4 frames
    17. org.springframework.boot
      RestartLauncher.run
      1. org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)[spring-boot-devtools-1.3.5.RELEASE.jar:1.3.5.RELEASE]
      1 frame