使用junit测试数据源时出现空指针异常：报错
在spring项目中使用druid作为连接池，配置数据源，
如题所示，在spring中配置druid作为数据源。以下是我的xml配置文件
<!--引入jdbc配置文件--> <context:property-placeholder location="classpath:databaseConfig.properties" ignore-unresolvable="true"/> <!-- 使用Druid连接池 --> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"> <property name="driverClassName" value="${jdbc.driverClassName}"/> <property name="url" value="${jdbc.url}" /> <property name="username" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> <!-- 配置初始化大小、最小、最大 --> <property name="initialSize" value="${initialSize}" /> <property name="minIdle" value="${minIdle}" /> <property name="maxActive" value="${maxActive}" /> <!-- 配置获取连接等待超时的时间 --> <property name="maxWait" value="${maxWait}" /> <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 --> <property name="timeBetweenEvictionRunsMillis" value="${timeBetweenEvictionRunsMillis}" /> <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 --> <property name="minEvictableIdleTimeMillis" value="${minEvictableIdleTimeMillis}" /> <property name="validationQuery" value="${validationQuery}" /> <property name="testWhileIdle" value="${testWhileIdle}" /> <property name="testOnBorrow" value="${testOnBorrow}" /> <property name="testOnReturn" value="${testOnReturn}" /> <!-- 打开PSCache，并且指定每个连接上PSCache的大小 --> <property name="poolPreparedStatements" value="${poolPreparedStatements}" /> <property name="maxPoolPreparedStatementPerConnectionSize" value="${maxPoolPreparedStatementPerConnectionSize}" /> <!-- 配置监控统计拦截的filters --> <property name="filters" value="${filters}" /> </bean>
以下是我的databaseConfig.properties属性文件,为方便提问，账号密码等有做修改。
jdbc.driverClassName = oracle.jdbc.driver.OracleDriver jdbc.url = jdbc:oracle:thin:@10.153.123.169:1521:SZQX jdbc.username = username jdbc.password = password <!--连接池初始化数量--> initialSize = 10 <!--最大并发数量--> maxActive = 10 <!-最小空闲连接数-> minIdle = 4 <!-- 配置获取连接等待超时的时间 --> maxWait = 60000 <!-- 超过时间限制是否回收 --> removeAbandoned = true <!-- 超过时间限制多长； --> removeAbandonedTimeout = 180 <!-- 配置间隔多久才进行一次检测，检测需要关闭的空闲连接，单位是毫秒 --> timeBetweenEvictionRunsMillis = 60000 <!-- 配置一个连接在池中最小生存的时间，单位是毫秒 --> minEvictableIdleTimeMillis = 300000 <!-- 用来检测连接是否有效的sql，要求是一个查询语句--> validationQuery = SELECT 1 FROM DUAL <!-- 申请连接的时候检测 --> testWhileIdle = true <!-- 申请连接时执行validationQuery检测连接是否有效，配置为true会降低性能 --> testOnBorrow = false <!-- 归还连接时执行validationQuery检测连接是否有效，配置为true会降低性能 --> testOnReturn = false <!-- 打开PSCache，并且指定每个连接上PSCache的大小 --> poolPreparedStatements = true maxPoolPreparedStatementPerConnectionSize = 50 <!-- 配置监控统计拦截的filters --> filters = log4j,stat
junit 测试代码：
public class Test {
@org.junit.Test
public void test(){
BeanFactory factory = new ClassPathXmlApplicationContext("dataSource.xml");
DataSource ds = (DataSource) factory.getBean("dataSource");
try {
Connection conn = ds.getConnection();
PreparedStatement ps = conn.prepareStatement("select sysdate from dual");
ResultSet rs = ps.executeQuery();
while(rs.next()){
System.out.println(rs.getString(1));
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}
Test (3) Test test(Test) java.lang.NullPointerException at com.alibaba.druid.filter.logging.LogFilter.connection_connectAfter(LogFilter.java:349) at com.alibaba.druid.filter.FilterEventAdapter.connection_connect(FilterEventAdapter.java:40) at com.alibaba.druid.filter.FilterChainImpl.connection_connect(FilterChainImpl.java:142) at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1377) at com.alibaba.druid.pool.DruidAbstractDataSource.createPhysicalConnection(DruidAbstractDataSource.java:1431) at com.alibaba.druid.pool.DruidDataSource.init(DruidDataSource.java:632) at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:934) at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:930) at com.alibaba.druid.pool.DruidDataSource.getConnection(DruidDataSource.java:102) at Test.test(Test.java:25) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:47) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:44) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:271) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:70) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:238) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:63) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:236) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:53) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:229) at org.junit.runners.ParentRunner.run(ParentRunner.java:309) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
junit 测试时，获取到的dataSource 对象属性。
pom文件：
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>javax.servlet-api</artifactId>
<version>3.1.0</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>fastjson</artifactId>
<version>1.2.4</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.1.1.RELEASE</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.0.3.RELEASE</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.0.3.RELEASE</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context-support</artifactId>
<version>4.1.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-aop</artifactId>
<version>4.2.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-jdbc</artifactId>
<version>4.2.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>4.2.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.jboss.spec.javax.annotation</groupId>
<artifactId>jboss-annotations-api_1.1_spec</artifactId>
<version>1.0.0.Final</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.codehaus.jackson</groupId>
<artifactId>jackson-mapper-asl</artifactId>
<version>1.9.13</version>
</dependency>
<dependency>
<groupId>org.aspectj</groupId>
<artifactId>aspectjweaver</artifactId>
<version>1.8.7</version>
</dependency>
<dependency>
<groupId>dom4j</groupId>
<artifactId>dom4j</artifactId>
<version>1.6.1</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.17</version>
</dependency>
<dependency>
<groupId>commons-codec</groupId>
<artifactId>commons-codec</artifactId>
<version>1.10</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.2.8</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis-spring</artifactId>
<version>1.2.3</version>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid</artifactId>
<version>1.0.15</version>
</dependency>
<dependency>
<groupId>com.oracle</groupId>
<artifactId>ojdbc6</artifactId>
<version>11.2.0</version>
<scope>compile</scope>
</dependency>
<dependency>
<groupId>org.quartz-scheduler</groupId>
<artifactId>quartz</artifactId>
<version>2.2.1</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-tx</artifactId>
<version>4.1.1.RELEASE</version>
</dependency>
<dependency>
<groupId>org.mybatis</groupId>
<artifactId>mybatis</artifactId>
<version>3.3.0</version>
</dependency>
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已经解决,一个地方写错,文中错误已经修改过来,感谢各位帮忙查错. 文中配置已经可以运行，可供参考######
就是这样！引用来自“暴怒的栗子”的评论
已经解决,一个地方写错,文中错误已经修改过来,感谢各位帮忙查错. 文中配置已经可以运行，可供参考2020-06-08 14:21:33赞同 展开评论 打赏
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