jdbc 测试问题（使用JUtil4）

Question

 package com.java;


import java.io.InputStream;
import java.sql.Connection;
import java.sql.Driver;
import java.util.Properties;

import org.junit.Test;

public class javaTest {



    public Connection getConnection() throws Exception {
        String driverClass = null;
        String jdbcUrl = null;
        String user = null;
        String password = null;

        InputStream in = getClass().getClassLoader().getResourceAsStream("jdbc.properties");
        Properties properties = new Properties();
        properties.load(in);
        driverClass = properties.getProperty("driver");
        jdbcUrl = properties.getProperty("jdbcUrl");
        user = properties.getProperty("user");
        password = properties.getProperty("password");

        Driver driver = (Driver) Class.forName(driverClass).newInstance();
        Properties info = new Properties();
        info.put("user",user);
        info.put("password",password);
        Connection connection = driver.connect(jdbcUrl,info);
        return connection;
    }

    @Test
    public void testGetConnection() throws Exception {
        System.out.println(getConnection());
    }
}

java.lang.NullPointerException
at java.util.Properties$LineReader.readLine(Properties.java:434)
at java.util.Properties.load0(Properties.java:353)
at java.util.Properties.load(Properties.java:341)
at com.java.javaTest.getConnection(javaTest.java:23)
at com.java.javaTest.testGetConnection(javaTest.java:39)
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:50)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
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)

出现了空指针异常 是怎么回事呢？查了好多资料都没有解决了 这个应该不是JUtil4兼容问题吧？

这个问题困扰我好久了 自己弄了半天也没有解决了 希望大神们可以帮我，指点我一下。

Answer 1

看你报的错，是这行有问题：
properties.load(in);
可以判断是in是空指针
也就是加载jdbc.properties时出现了问题，检查下路径什么的或者是加载方式可不可取。