HTTP Status 500 -
type Exception report
message
description The server encountered an internal error that prevented it from fulfilling this request.
exception
org.apache.ibatis.exceptions.PersistenceException:
Error querying database. Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.
The error may exist in com/cxy/mapper/BrandMapper.java (best guess)
The error may involve com.cxy.mapper.BrandMapper.selectAll
The error occurred while executing a query
Cause: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.
org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:149)
org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:140)
org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:147)
org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:80)
org.apache.ibatis.binding.MapperProxy$PlainMethodInvoker.invoke(MapperProxy.java:152)
org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:85)
jdk.proxy4/jdk.proxy4.$Proxy30.selectAll(Unknown Source)
com.cxy.service.impl.BrandServiceImpl.selectAll(BrandServiceImpl.java:22)
com.cxy.web.servlet.SelectAllServlet.doGet(SelectAllServlet.java:21)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
root cause
com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Could not create connection to database server.
java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77)
java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480)
com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
com.mysql.jdbc.Util.getInstance(Util.java:360)
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:956)
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:935)
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:924)
com.mysql.jdbc.SQLError.createSQLException(SQLError.java:870)
com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2311)
com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2064)
com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:790)
com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:44)
java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77)
java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480)
com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:395)
com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:325)
java.sql/java.sql.DriverManager.getConnection(DriverManager.java:681)
java.sql/java.sql.DriverManager.getConnection(DriverManager.java:190)
org.apache.ibatis.datasource.unpooled.UnpooledDataSource.doGetConnection(UnpooledDataSource.java:224)
org.apache.ibatis.datasource.unpooled.UnpooledDataSource.doGetConnection(UnpooledDataSource.java:219)
org.apache.ibatis.datasource.unpooled.UnpooledDataSource.getConnection(UnpooledDataSource.java:95)
org.apache.ibatis.datasource.pooled.PooledDataSource.popConnection(PooledDataSource.java:432)
org.apache.ibatis.datasource.pooled.PooledDataSource.getConnection(PooledDataSource.java:89)
org.apache.ibatis.transaction.jdbc.JdbcTransaction.openConnection(JdbcTransaction.java:139)
org.apache.ibatis.transaction.jdbc.JdbcTransaction.getConnection(JdbcTransaction.java:61)
org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:337)
org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:86)
org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:62)
org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:325)
org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)
org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:89)
org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:147)
org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:140)
org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:147)
org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:80)
org.apache.ibatis.binding.MapperProxy$PlainMethodInvoker.invoke(MapperProxy.java:152)
org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:85)
jdk.proxy4/jdk.proxy4.$Proxy30.selectAll(Unknown Source)
com.cxy.service.impl.BrandServiceImpl.selectAll(BrandServiceImpl.java:22)
com.cxy.web.servlet.SelectAllServlet.doGet(SelectAllServlet.java:21)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
root cause
java.lang.NullPointerException: Cannot invoke "java.util.Map.get(Object)" because "this.serverVariables" is null
com.mysql.jdbc.ConnectionImpl.getServerCharset(ConnectionImpl.java:2983)
com.mysql.jdbc.MysqlIO.sendConnectionAttributes(MysqlIO.java:1873)
com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1802)
com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1206)
com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2234)
com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2265)
com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2064)
com.mysql.jdbc.ConnectionImpl.(ConnectionImpl.java:790)
com.mysql.jdbc.JDBC4Connection.(JDBC4Connection.java:44)
java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77)
java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499)
java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480)
com.mysql.jdbc.Util.handleNewInstance(Util.java:377)
com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:395)
com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:325)
java.sql/java.sql.DriverManager.getConnection(DriverManager.java:681)
java.sql/java.sql.DriverManager.getConnection(DriverManager.java:190)
org.apache.ibatis.datasource.unpooled.UnpooledDataSource.doGetConnection(UnpooledDataSource.java:224)
org.apache.ibatis.datasource.unpooled.UnpooledDataSource.doGetConnection(UnpooledDataSource.java:219)
org.apache.ibatis.datasource.unpooled.UnpooledDataSource.getConnection(UnpooledDataSource.java:95)
org.apache.ibatis.datasource.pooled.PooledDataSource.popConnection(PooledDataSource.java:432)
org.apache.ibatis.datasource.pooled.PooledDataSource.getConnection(PooledDataSource.java:89)
org.apache.ibatis.transaction.jdbc.JdbcTransaction.openConnection(JdbcTransaction.java:139)
org.apache.ibatis.transaction.jdbc.JdbcTransaction.getConnection(JdbcTransaction.java:61)
org.apache.ibatis.executor.BaseExecutor.getConnection(BaseExecutor.java:337)
org.apache.ibatis.executor.SimpleExecutor.prepareStatement(SimpleExecutor.java:86)
org.apache.ibatis.executor.SimpleExecutor.doQuery(SimpleExecutor.java:62)
org.apache.ibatis.executor.BaseExecutor.queryFromDatabase(BaseExecutor.java:325)
org.apache.ibatis.executor.BaseExecutor.query(BaseExecutor.java:156)
org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:109)
org.apache.ibatis.executor.CachingExecutor.query(CachingExecutor.java:89)
org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:147)
org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:140)
org.apache.ibatis.binding.MapperMethod.executeForMany(MapperMethod.java:147)
org.apache.ibatis.binding.MapperMethod.execute(MapperMethod.java:80)
org.apache.ibatis.binding.MapperProxy$PlainMethodInvoker.invoke(MapperProxy.java:152)
org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:85)
jdk.proxy4/jdk.proxy4.$Proxy30.selectAll(Unknown Source)
com.cxy.service.impl.BrandServiceImpl.selectAll(BrandServiceImpl.java:22)
com.cxy.web.servlet.SelectAllServlet.doGet(SelectAllServlet.java:21)
javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
javax.servlet.http.HttpServlet.service(HttpServlet.java:728)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
note The full stack trace of the root cause is available in the Apache Tomcat/7.0.47 logs.