properties文件读取

创建jedispoolUtils工具类，读取jedis.propertie文件时

static {
    //读取配置文件
    InputStream is = jedisPool.getClass().getClassLoader().getResourceAsStream("jedis.properties");
    //创建properties文件
    Properties pro = new Properties();
    //关联文件
    try {
        pro.load(is);
    } catch (IOException e) {
        e.printStackTrace();
    }
    //获取数据，关联到JedisPollConfig中
    JedisPoolConfig config = new JedisPoolConfig();
    config.setMaxTotal(Integer.parseInt(pro.getProperty("maxTotal")));
    config.setMaxIdle(Integer.parseInt(pro.getProperty("maxIdle")));
    jedisPool = new JedisPool(config,pro.getProperty("host"),Integer.parseInt(pro.getProperty("port")));
}



//报错
java.lang.ExceptionInInitializerError
	at com.yc.JedisTest.demo8(JedisTest.java:130)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	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$2.evaluate(ParentRunner.java:268)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
	at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
	at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:220)
	at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:53)
Caused by: java.lang.NullPointerException
	at com.yc.utils.JedisPoolUtils.<clinit>(JedisPoolUtils.java:19)
	... 23 more

java.lang.ExceptionInInitializerError
at com.yc.JedisTest.demo8(JedisTest.java:130)

Caused by: java.lang.NullPointerException
at com.yc.utils.JedisPoolUtils.

本来以为是properties文件位置导致的初始化异常，纠结很久也没有改出来。

空指针异常来源于jedisPool.getClass().getClassLoader().getResourceAsStream("jedis.properties");

此时jedisPool为null，并未初始化，应将代码改为

JedisPool.class.getClassLoader().getResourceAsStream("jedis.properties");