org.apache.ibatis.exceptions.PersistenceException:

### Error opening session.  Cause: java.lang.NullPointerException

### Cause: java.lang.NullPointerException

	at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:26)

	at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSessionFromDataSource(DefaultSqlSessionFactory.java:91)

	at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSession(DefaultSqlSessionFactory.java:46)

	at com.cz.mybatis.MyFirstMyBatis.findUsersTest(MyFirstMyBatis.java:52)

	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.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)

	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)

	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)

	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)

	at org.junit.runners.BlockJUnit4ClassRunner.runNotIgnored(BlockJUnit4ClassRunner.java:79)

	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:71)

	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:49)

	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)

	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)

	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)

	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)

	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)

	at org.junit.runners.ParentRunner.run(ParentRunner.java:236)

	at org.junit.runner.JUnitCore.run(JUnitCore.java:157)

	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:68)

	at com.intellij.rt.execution.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:47)

	at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:242)

	at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:70)

Caused by: java.lang.NullPointerException

	at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSessionFromDataSource(DefaultSqlSessionFactory.java:86)

	... 24 more

<environments default="test"> <!--default="test" 改成default="development"就对了-->

        <!-- id：唯一标识 -->

        <!--environment id="test"-->

            <!-- 事务管理器，JDBC类型的事务管理器 -->

            <!--transactionManager type="JDBC" /-->

            <!-- 数据源，池类型的数据源 -->

            <!--dataSource type="POOLED">

                <property name="driver" value="com.mysql.jdbc.Driver" />

                <property name="url" value="jdbc:mysql://127.0.0.1:3306/mybatis-110" />

                <property name="username" value="root" />

                <property name="password" value="123456" />

            </dataSource-->

        <!--/environment-->

        <environment id="development">

            <!-- 事务管理器，JDBC类型的事务管理器 -->

            <transactionManager type="JDBC" />

            <!-- 数据源，池类型的数据源 -->

            <dataSource type="POOLED">

                <property name="driver" value="${jdbc.driver}" /> <!-- 配置了properties，所以可以直接引用 -->

                <property name="url" value="${jdbc.url}" />

                <property name="username" value="${jdbc.username}" />

                <property name="password" value="${jdbc.password}" />

            </dataSource>

        </environment>

    </environments>